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Storage tank

A storage tank is a large vessel designed to store liquids or gases, serving purposes such as containment, mixing, and maintaining material conditions like viscosity in industrial processes.^[1] These tanks are widely used across industries, including oil and gas production to hold crude oil, produced water, and gas condensate for stabilizing flow from wells; water supply systems for potable or wastewater storage; and chemical processing for hazardous substances.^[2]^[1] Key types include aboveground and underground tanks, with the latter requiring enhanced corrosion resistance and structural strength due to burial; cylindrical shapes predominate for underground applications to optimize space and pressure distribution, while rectangular forms suit certain aboveground setups.^[1] Single-wall tanks provide basic containment, whereas double-wall designs incorporate an inner and outer layer for added protection against leaks.^[1] Roof configurations further classify tanks, such as fixed-roof tanks for lower-vapor-pressure substances and floating-roof tanks—either external or internal—to minimize evaporation losses in volatile liquid storage.^[3] Pressurized tanks handle higher internal pressures for gases like liquefied petroleum gas (LPG), while atmospheric tanks operate at near-ambient conditions for products like crude oil derivatives, water, and biofuels.^[4] Construction materials typically include carbon steel, alloy steel, or stainless steel for durability and compatibility with contents, with fiberglass-reinforced options used for corrosion-prone environments like underground petroleum storage.^[1] Vertical or horizontal orientations accommodate site constraints, and features like heating coils or insulation ensure material stability.^[1] Standards such as API 650 govern the design, fabrication, and erection of welded steel tanks for oil storage, emphasizing safety, environmental protection, and operational reliability in the petroleum sector.^[5] Regulations from agencies like the U.S. Environmental Protection Agency (EPA) address spill prevention, inspection, and decommissioning, particularly for aboveground storage tanks (ASTs) and underground storage tanks (USTs) containing oils or hazardous materials.^[6]

Overview

Definition and Purpose

A storage tank is a stationary container engineered to hold liquids, gases, or solids for temporary or extended periods, serving as a fixed repository in industrial, commercial, or municipal settings. These structures are distinct from transport vessels, such as pipelines, tanker trucks, or ships, which are designed for the active conveyance of materials across distances rather than containment at a single location.^[2]^[7] The fundamental purposes of storage tanks encompass the secure retention of raw materials, process intermediates, or completed products; the mitigation of supply and demand imbalances to maintain operational continuity; and the support of downstream activities like treatment, blending, or shipment. By providing reliable containment, these tanks enable efficient resource management across diverse sectors, including energy production, water supply, and chemical processing, thereby minimizing disruptions in production cycles.^[8]^[9] Capacities of storage tanks span a broad spectrum, from compact units accommodating around 1,000 liters for localized applications to expansive installations holding tens of millions of gallons—equivalent to hundreds of thousands of barrels—for bulk commodity storage. Predominantly stationary to integrate seamlessly with fixed infrastructure, some tanks incorporate semi-mobile features for adaptability in temporary or relocatable scenarios. In economic terms, storage tanks are indispensable to global supply chains in energy, water, and manufacturing industries, underpinning the storage tank market's projected value of $15.49 billion in 2025.^[10]^[11]^[12]

Etymology and History

The term "tank" in the context of storage derives from the Portuguese word tanque, meaning a pool or pond, which itself traces back to the Latin stagnum referring to standing water.^[13] This etymological root entered English in the mid-17th century, initially denoting artificial reservoirs or cisterns for water storage, such as those used in irrigation or household supply.^[14] Early applications emphasized containment of liquids like water, evolving from natural pools to engineered vessels by the 18th century.^[15] Early water storage structures, such as reservoirs and canals, date to ancient Mesopotamia around 4000–3000 BCE, supporting urban centers like those in Sumer through irrigation and water management amid arid conditions and seasonal flooding. In the Roman era, aqueduct systems incorporated large reservoirs and cisterns, such as those at the termini of channels like the Aqua Appia, to store and distribute water for urban use, with capacities reaching millions of gallons in structures like the Piscina Mirabilis.^[16] By the medieval period, wooden barrels emerged as a primary storage method for liquids including water and oil, crafted from oak or other woods by coopers to ensure watertightness and portability, as seen in European trade and monastic brewing.^[17] These barrels, often hooped with willow or iron, allowed efficient transport of commodities like olive oil across trade routes.^[18] The industrial era marked a shift to metal construction, with 19th-century steel tanks appearing in Pennsylvania's oil fields following the 1859 Titusville discovery, initially riveted for durability against fire and leakage in booming refineries.^[19] By the 1870s, these steel tanks replaced wooden ones in Oil Creek Valley operations, enabling larger-scale storage amid production surges to millions of barrels annually.^[20] The American Petroleum Institute (API), founded in 1919, introduced standards like API 12A in the late 1920s (1928) to regulate oil storage tanks, addressing safety amid the refinery expansion of the 1910s.^[21] These guidelines covered fabrication and erection, reducing incidents in an industry prone to explosions. In the mid-20th century, fiberglass-reinforced plastic (FRP) tanks emerged in the 1950s for their corrosion resistance, particularly in chemical storage, paving the way for advanced composites. Post-World War II innovations included widespread adoption of spherical tanks for pressurized gases like liquefied natural gas (LNG), building on 1920s patents such as the Hortonsphere for optimal pressure distribution and material efficiency.^[22] In the 1980s, following the 1984 amendments to the Resource Conservation and Recovery Act (RCRA), U.S. environmental regulations spurred the development and adoption of double-walled tanks for underground petroleum storage to prevent leaks and minimize groundwater contamination.^[23] Entering the 21st century, composite materials like fiber-reinforced polymers gained prominence for their superior corrosion resistance, offering lightweight alternatives to steel in chemical and water storage, with applications in sustainable designs that extend service life without rusting.^[24]

Design and Construction

Materials and Components

Storage tanks are constructed from a variety of materials selected based on the stored substance, environmental conditions, and operational requirements. Carbon steel is widely used for its structural durability and cost-effectiveness, particularly in tanks compliant with API 650 standards for welded steel tanks intended for oil storage, where materials like ASTM A36 or A283 grades provide reliable strength. Stainless steel, such as grades 304 or 316, and specialized alloys like Hastelloy C-276 are preferred for handling corrosive substances due to their inherent resistance to pitting, stress corrosion cracking, and oxidation in aggressive chemical environments. Fiberglass-reinforced plastic (FRP) offers a lightweight alternative with superior chemical resistance, making it suitable for storing acids, alkalis, and other reactive materials without significant degradation. For large-scale water storage, prestressed concrete provides exceptional longevity and structural integrity, often used in municipal and industrial applications for potable or non-potable water containment. Material choice is influenced by several key factors to ensure long-term performance. Corrosion resistance is paramount, frequently achieved through cathodic protection systems employing sacrificial anodes, such as zinc or aluminum, which prevent electrochemical degradation of steel surfaces in contact with soil or electrolytes. Temperature tolerance also plays a critical role; for instance, carbon steel tanks designed under API 650 are rated for maximum operating temperatures up to 93°C (200°F) to maintain material integrity without excessive thermal expansion or stress. Additionally, the balance between initial cost and expected lifespan guides selection, with properly coated carbon steel tanks achieving a service life of 25 to 40 years through protective barriers that mitigate environmental exposure. The primary structural components of a storage tank include the shell, which forms the vertical cylindrical body and bears the majority of the hydrostatic load; the roof, available in fixed, cone, or floating configurations to accommodate vapor space minimization and prevent over-pressurization; and the bottom, typically flat for stability or sloped to facilitate drainage and sediment removal. Nozzles and fittings are integrated into the shell or roof to enable inlet/outlet connections, level gauging, and sampling, ensuring operational accessibility while maintaining structural seals. Ladders and stairs, often with safety cages, provide essential external and internal access for inspection and maintenance, complying with OSHA standards for worker safety. Insulation layers, such as foam or mineral wool encased in weatherproof jackets, are applied to the shell and roof to regulate internal temperatures and prevent condensation or heat loss in extreme climates. Construction methods vary by tank size and application to optimize efficiency and integrity. Bolted assembly is common for smaller tanks, allowing modular panel fabrication with factory-applied coatings for quick on-site erection and reduced labor. Larger tanks rely on welded fabrication, where steel plates are shop-cut and field-welded to form seamless joints, followed by rigorous non-destructive testing to verify weld quality. Internal and external coatings, such as fusion-bonded epoxy, are applied to enhance corrosion protection and extend service life, particularly in harsh environments.

Pressure and Structural Classifications

Storage tanks are classified by operating pressure into three primary categories: atmospheric, low-pressure, and high-pressure, each dictating specific design and material requirements to ensure structural integrity and safety. Atmospheric tanks operate at pressures from atmospheric through 0.5 psig (pounds per square inch gauge),^[25] and are often open to the atmosphere or equipped with vents to maintain equilibrium, making them suitable for storing non-volatile liquids like water or crude oil without significant vapor buildup. Low-pressure tanks handle internal pressures from 1 to 15 psig, designed for liquids with moderate vapor pressure such as gasoline or certain chemicals, where slight pressurization prevents excessive evaporation while avoiding the need for heavy reinforcements.^[26] High-pressure tanks exceed 15 psig and are commonly used for compressed gases like liquefied natural gas (LNG), often adopting spherical shapes to evenly distribute stresses and minimize material usage under extreme conditions.^[27] Structurally, storage tanks are configured in various forms to optimize space, accessibility, and environmental protection. Vertical cylindrical tanks are the most prevalent due to their efficient use of vertical space and straightforward construction, ideal for large-volume storage in industrial settings.^[28] Horizontal cylindrical tanks, typically employed for smaller capacities, facilitate easier installation and maintenance, particularly in constrained areas.^[29] Underground tanks are buried below ground level to shield contents from physical damage, temperature fluctuations, and visibility, commonly used for fuel or hazardous materials.^[30] Above-ground tanks, including those elevated on supports, enable gravity-fed distribution systems and simplify inspection, though they require robust foundations to withstand settling or seismic activity.^[28] Design considerations for pressure and structure emphasize adaptations to operational demands, including roof configurations and shell reinforcements. Fixed roofs, such as cone- or dome-shaped, are standard for atmospheric and low-pressure tanks storing non-volatile substances, providing weather protection without accommodating volume changes.^[31] Floating roofs, either external or internal, are employed in low-pressure tanks for volatile liquids like petroleum to minimize vapor space and evaporation losses by rising and falling with liquid levels.^[28] Wall thickness is calculated using the hoop stress formula for cylindrical shells, \sigma = \frac{P D}{2 t}, where \sigma is the allowable hoop stress, P is the internal pressure, D is the tank diameter, and t is the wall thickness; this ensures the shell withstands circumferential tensile forces without yielding.^[32] Higher pressures necessitate reinforcements like stiffening rings around the shell to resist buckling from external loads or vacuum conditions, enhancing overall rigidity based on the selected materials' strength.^[33]

Types of Storage Tanks

Atmospheric and Low-Pressure Tanks

Atmospheric storage tanks are engineered to operate at pressures close to ambient atmospheric levels, typically designed for internal pressures up to 2.5 psig (17 kPa gauge), making them suitable for storing non-pressurized liquids such as water and crude oil. These tanks feature open or vented configurations to facilitate pressure equalization with the surrounding environment, preventing structural stress from pressure differentials. They are widely constructed from welded steel and adhere to standards like API 650, which specifies requirements for material selection, fabrication, erection, and testing to ensure integrity under normal operating conditions.^[34]^[5] Key subtypes of atmospheric tanks include fixed-roof designs and floating-roof designs. Fixed-roof tanks incorporate a permanent cone-shaped or dome-shaped roof supported by columns or rafters, providing protection from environmental elements like rain and debris while allowing vapors to vent through breather valves; however, this creates a persistent headspace that can lead to evaporation losses.^[28] Floating-roof tanks mitigate vapor emissions by having the roof directly contact the liquid surface; external floating roofs use pontoons or double-deck structures for buoyancy and stability, while internal variants may employ skin-type flexible membranes or pontoons within a fixed outer shell to further reduce exposure to weather.^[31] These floating mechanisms adjust to liquid levels, minimizing the vapor space above the stored material and complying with emission control requirements in standards like API 650.^[34] Low-pressure storage tanks, often considered an extension of atmospheric designs, operate at slightly elevated internal pressures ranging from slightly above atmospheric to 15 psig and are used for semi-volatile liquids such as gasoline or specific chemicals that require minimal pressurization to prevent excessive vaporization. Governed by API 620 for pressures up to 15 psig or API 650 Appendix F for low-pressure tanks up to 15 psig, these tanks incorporate safety mechanisms like frangible roofs or weak roof-to-shell seams, which are engineered to fail preferentially during overpressure events to relieve internal pressure without compromising the tank shell or bottom integrity.^[35]^[36] Rupture disks serve as additional relief devices, bursting at predetermined pressures to vent excess gases or liquids rapidly and protect against scenarios like thermal expansion or fire exposure.^[37]^[38] In terms of design specifics, atmospheric and low-pressure tanks can accommodate capacities up to 100,000 m³, enabling large-scale bulk storage, with vertical cylindrical configurations being predominant for efficient space utilization. Secondary containment, commonly implemented via bunding—earthen or concrete walls surrounding the tank—captures potential spills, typically sized to hold at least 110% of the largest tank's capacity to mitigate environmental risks from leaks or overfills.^[39] These tank types offer advantages in cost-effectiveness, with simpler construction and lower material requirements compared to pressurized alternatives, facilitating widespread adoption for ambient-condition liquids. However, fixed-roof variants are prone to evaporation losses, contributing to volatile organic compound emissions, whereas floating-roof designs address this at a higher initial cost; overall, they dominate bulk liquid storage due to their suitability for non-refrigerated, low-vapor-pressure substances.^[38]

High-Pressure and Pressurized Tanks

High-pressure storage tanks are engineered to contain gases or volatile liquids at significantly elevated pressures, often exceeding 15 psig (1 bar), requiring robust designs to withstand internal stresses without deformation or rupture. These tanks typically adopt spherical or bullet-shaped (cylindrical with hemispherical ends) geometries to distribute stresses uniformly, minimizing material thickness while enhancing structural integrity. Spherical tanks, in particular, are ideal for large-scale storage due to their ability to handle uniform hoop stress in all directions, making them suitable for liquefied petroleum gas (LPG) storage with capacities ranging from 500 to 10,000 tons. Bullet-shaped tanks, resembling elongated capsules, are commonly used for horizontal storage of compressed gases like natural gas liquids (NGLs), offering efficient space utilization in industrial settings. Both configurations must comply with ASME Boiler and Pressure Vessel Code Section VIII, which governs the design, fabrication, and inspection of pressure vessels to ensure safety under high-pressure conditions. Pressurized systems extend these principles to specialized applications, such as cryogenic storage for liquefied natural gas (LNG), where double-walled construction with vacuum or perlite insulation maintains temperatures below -150°C to prevent boil-off and ensure containment. The inner tank, typically made from low-temperature steels like 9% nickel, holds the cryogenic fluid, while the outer shell provides secondary containment and supports insulation materials that minimize heat ingress. For non-cryogenic pressurized tanks, such as those for compressed air or industrial gases, safety valves are integral to relieve excess pressure and prevent over-pressurization, often designed to ASME standards for automatic activation at set thresholds. These systems contrast with atmospheric tanks by necessitating reinforced walls and advanced monitoring to manage dynamic loads from gas expansion or temperature fluctuations.^[40]^[41]^[42] A key aspect of design for these tanks involves calculating minimum wall thickness to resist internal pressure, primarily using formulas derived from thin-wall pressure vessel theory adjusted for practical engineering factors. For cylindrical shells, common in bullet-shaped tanks, the ASME Section VIII Division 1 (UG-27) formula for minimum thickness t is given by:

t = \frac{P R}{S E - 0.6 P}

where P is the internal design pressure, R is the inside radius, S is the maximum allowable stress of the material, and E is the joint efficiency (typically 1.0 for seamless construction or 0.85-1.0 for welded joints). This equation originates from the circumferential (hoop) stress formula for thin-walled cylinders, \sigma = \frac{P R}{t}, where the allowable stress is \sigma = S E, yielding the basic t = \frac{P R}{S E}. The ASME adjustment subtracts $0.6 P in the denominator to account for radial stress contributions in thicker walls and longitudinal stress effects, providing a conservative estimate that approximates Lame's thick-wall solution for internal pressure without requiring complex finite element analysis. For spherical tanks, a similar but adjusted formula applies: t = \frac{P R}{2 S E - 0.2 P}, reflecting the biaxial stress distribution. These calculations ensure the tank's integrity under operating pressures, with material selection based on factors like yield strength and corrosion allowance.^[43]^[44]^[45] In applications, high-pressure and pressurized tanks are essential for storing industrial gases such as hydrogen, oxygen, or propane, as well as fuels like LPG and LNG, enabling safe transport and distribution in petrochemical and energy sectors. For instance, spherical LPG tanks facilitate bulk storage at refineries, while cryogenic LNG tanks support liquefaction plants with capacities up to 200,000 m³. However, these tanks face challenges from fatigue induced by repeated pressure cycles during filling and emptying, which can lead to crack initiation at weld sites or material discontinuities if cycles exceed design limits (often 10,000-100,000 cycles). Mitigation involves fatigue analysis per ASME Section VIII Division 2, incorporating stress-life curves to predict endurance and schedule non-destructive testing.^[46]^[47]^[48]

Thermal and Specialized Storage Tanks

Thermal storage tanks are designed to maintain specific temperatures for energy efficiency, often incorporating insulation and stratification to optimize heat retention or dissipation. Insulated hot water storage tanks, such as those used in solar heating systems, feature high-density polyurethane foam insulation with R-values ranging from R-12 to R-30 to minimize thermal losses, enabling prolonged storage of heated water.^[49] Stratified designs in these tanks promote layering of water by temperature, with hotter fluid at the top for efficient extraction in domestic hot water or space heating applications, as seen in vertical tanks optimized for solar thermal systems.^[50] Chilled water storage tanks serve HVAC systems by providing buffer capacity to prevent short cycling of chillers, stabilizing return water temperatures and increasing system volume relative to chiller output, typically in insulated vessels that store cooled water for peak demand periods.^[51] Phase-change materials (PCMs) enhance efficiency in these tanks by storing latent heat during phase transitions, achieving up to four times the energy density of water alone and improving overall thermal storage performance by 18-27% in exergy efficiency compared to sensible heat methods.^[52]^[53] Specialized storage tanks address niche requirements beyond general thermal management, focusing on biological processes, product preservation, or mobility. Septic tanks function as anaerobic digesters for wastewater treatment, where bacteria break down organic matter in an oxygen-free environment, partially treating sewage and producing biogas as a byproduct before effluent dispersal.^[54] Milk silos in dairy operations are vertical, stainless steel vessels with integrated cooling jackets, such as dimple plate designs, to rapidly chill raw milk to 4°C and maintain quality by preventing bacterial growth during on-farm storage.^[55] These silos typically range from 10,000 to 50,000 liters in capacity for farm-scale use, allowing efficient bulk handling before transport to processing facilities.^[56] Mobile ISO tanks, standardized under International Organization for Standardization guidelines, provide portable storage for liquids during intermodal transport by ship, rail, or truck, with stainless steel construction suitable for hazardous or non-hazardous bulk chemicals and foodstuffs. Unique features in thermal and specialized tanks enhance performance and safety, including heat tracing systems with electric coils or cables wrapped around exteriors to compensate for ambient heat loss and maintain fluid temperatures in viscous or temperature-sensitive applications.^[57] Double-skin constructions, featuring an inner storage vessel within an outer insulated shell, provide superior thermal barriers using materials like polyurethane foam, reducing energy demands for temperature control in both hot and chilled systems.^[58] Innovations in this domain include underground thermal energy storage (UTES) systems, which have seen rapid expansion in the 2020s for integrating renewables like solar and wind into heating networks. These subsurface facilities, such as aquifer thermal energy storage (ATES) or borehole thermal energy storage (BTES), store excess seasonal heat or cold in geological formations, offering large-scale capacities with efficiencies up to 80% for district heating and supporting decarbonization efforts.^[59]^[60]

Applications

In the Petroleum and Refining Industry

In the petroleum and refining industry, storage tanks play a critical role in managing crude oil and refined products, serving as essential intermediaries in the supply chain from extraction to distribution. At oil terminals, large-scale crude oil storage tanks are commonly equipped with floating roofs to mitigate volatility issues associated with hydrocarbon vapors. These external floating roof designs minimize the vapor space above the stored liquid, thereby reducing evaporation, volatile organic compound (VOC) emissions, and the risk of fire or explosion while preserving the quality and value of the crude oil.^[61]^[62] In refineries, dedicated tanks store feedstocks such as naphtha, which is derived from processes like fluid catalytic cracking and reforming, before it is blended into final products like gasoline. These tanks ensure a steady supply for processing units and allow for quality control prior to downstream operations.^[63]^[64] Design standards for these tanks are governed by the American Petroleum Institute (API), with API 650 providing guidelines for the fabrication, erection, and design of welded steel tanks intended for oil storage at atmospheric pressure. API 650 covers tanks with diameters exceeding 30 feet (9.1 meters) and capacities up to 500,000 barrels (79,500 cubic meters), enabling the construction of massive crude oil storage vessels that can reach diameters of up to approximately 100 meters in major terminals. Complementing this, API 653 outlines protocols for the inspection, repair, alteration, and reconstruction of such tanks to maintain structural integrity over time. In gasoline production, blending tanks often incorporate mechanical mixers, such as side-entry or propeller types, to homogenize components like reformate, alkylate, and butane, ensuring uniform octane ratings and compliance with product specifications.^[34]^[65]^[66]^[67]^[68] Globally, the petroleum sector relies on an extensive network of aboveground storage tanks, with over 600,000 such units in the United States alone supporting crude oil and refined product storage. These tanks are integrated with pipeline systems at terminals for efficient transfer, where isolation valves and breakout tanks facilitate flow stabilization between production sites and refineries. Additionally, flare systems are connected to storage operations to safely combust excess vapors from tanks, preventing atmospheric releases during filling, emptying, or pressure relief events. This integration enhances operational safety and efficiency across the midstream and downstream segments.^[69]^[70]^[71]^[72] The 1973 oil crisis significantly influenced storage infrastructure in the petroleum industry, prompting the development of larger-capacity tanks to buffer against supply disruptions. In response to the embargo's shortages, the United States established the Strategic Petroleum Reserve (SPR), comprising underground salt caverns and aboveground tanks with a total capacity of 714 million barrels, underscoring a shift toward expanded strategic and commercial storage to enhance energy security. This era spurred investments in oversized tanks worldwide, with refinery and terminal capacities growing to accommodate volatile global oil flows and mitigate future embargo risks.^[73]^[74]^[75]

In Chemical and Industrial Processing

In chemical and industrial processing, storage tanks serve as critical vessels for holding raw materials, intermediates, and finished products, ensuring safe containment and facilitating efficient workflow in manufacturing operations. These tanks are engineered to withstand corrosive environments and varying pressures, often incorporating specialized materials and designs to prevent reactions or contamination during storage. For instance, in chemical synthesis plants, tanks store reagents like acids and solvents, while in broader industrial settings, they manage bulk solids and sterile formulations essential for production continuity.^[76] Chemical storage tanks are commonly used for acids and solvents, where materials like fiberglass-reinforced plastic (FRP) provide resistance to corrosion and solvent degradation, making them suitable for harsh substances such as hydrochloric acid or organic solvents. FRP tanks are fabricated with resins selected for chemical compatibility, offering lightweight construction and ease of installation compared to lined steel alternatives. In batch processing, these tanks often function as reactors equipped with agitators to promote uniform mixing and controlled reactions; a typical batch reactor consists of a cylindrical vessel with an integrated impeller system and heating or cooling jackets, enabling precise temperature management for processes like polymerization or neutralization.^[77]^[76]^[78] For industrial applications involving powders, silos represent a specialized form of storage tank designed for dry bulk materials like cement, featuring conical hoppers for controlled discharge and vibration aids to prevent bridging. These vertical structures, often constructed from steel or concrete, maintain material flow integrity in sectors such as construction and manufacturing, with capacities tailored to operational demands. In the pharmaceutical industry, storage tanks incorporate sterile linings, such as single-use polymer films or electropolished stainless steel interiors, to ensure aseptic conditions and minimize cross-contamination risks during the holding of biologics or active ingredients. These linings, compliant with GMP standards, facilitate cleaning validation and extend product shelf life.^[79]^[80]^[81] Regulatory frameworks, particularly those from the U.S. Environmental Protection Agency (EPA), govern the storage of hazardous materials in these tanks, mandating secondary containment systems like double-walled designs to enable early leak detection through interstitial monitoring capable of identifying releases within 24 hours. For underground tank systems without full secondary containment, semi-annual leak testing at a sensitivity of 0.05 gallons per hour is required to protect groundwater from chemical spills. Such measures ensure compliance and mitigate environmental risks in industrial settings.^[82]^[83]^[84] Storage tank scales in chemical processing vary widely, from laboratory units around 100 liters for small-scale testing to industrial-scale vessels exceeding 10,000 cubic meters for bulk production, allowing flexibility from R&D to full plant operations. A representative example is the ethylene storage sphere, a high-pressure spherical tank used in petrochemical facilities to hold liquefied ethylene at refrigerated temperatures, optimizing space and minimizing boil-off losses due to its uniform stress distribution. These spheres, often elevated on legs for access, reference pressurized designs to handle gases under elevated conditions safely.^[85]^[27]^[86]

In Water, Wastewater, and Agricultural Uses

Storage tanks play a crucial role in water management systems, ensuring reliable supply for municipal and residential needs. Elevated water tanks, often constructed from welded steel or concrete, are designed to maintain pressure in distribution networks through gravity feed. These structures, such as the iconic concrete spheroid tanks pioneered in the mid-20th century, can hold capacities ranging from 1 to 5 million gallons, supporting urban populations by storing treated water at heights of up to 200 feet. The American Water Works Association (AWWA) standard D100 governs the design and construction of these welded steel tanks for potable water, specifying requirements for corrosion resistance and structural integrity to prevent contamination. Rainwater harvesting systems frequently employ cisterns as underground or above-ground storage tanks to capture and store roof runoff for non-potable uses like irrigation or flushing. These tanks, typically made from polyethylene, fiberglass, or concrete, range in size from 500 to 10,000 gallons and incorporate features like first-flush diverters to exclude debris. According to the U.S. Environmental Protection Agency (EPA), such cisterns help mitigate stormwater runoff and reduce demand on municipal supplies, with installation guidelines emphasizing filtration and overflow management for water quality. In wastewater treatment, storage tanks facilitate the processing and containment of sewage and sludge. Septic tanks, commonly used in rural or decentralized systems, are buried concrete or plastic vessels that allow solids to settle while liquids percolate into the soil; standard designs hold 1,000 to 2,000 gallons for household applications. Anaerobic digesters, larger cylindrical tanks often made of steel or concrete, promote microbial breakdown of organic waste to produce biogas, with capacities up to several million gallons in municipal facilities. Clarifiers in wastewater treatment plants employ large, circular settling tanks—typically 50 to 150 feet in diameter—to separate solids from effluent through gravity sedimentation. The EPA's wastewater management guidelines outline these tank configurations to ensure efficient treatment and compliance with discharge standards. Agricultural applications of storage tanks focus on preserving resources and supporting livestock and crop production. Irrigation reservoirs, often earthen-lined or concrete structures, store water from rivers or wells for seasonal distribution, with farm-scale tanks holding 10,000 to 100,000 gallons to optimize usage during dry periods. Silage bunkers serve as open-top concrete or earth-walled tanks for fermenting and storing fodder, preventing spoilage through anaerobic conditions and typically accommodating hundreds of tons of material. In dairy farming, bulk milk cooling tanks—stainless steel vessels with integrated refrigeration—maintain milk at 39°F (4°C) post-milking, with capacities from 200 to 1,000 gallons per tank to preserve quality before transport. These agricultural tanks adhere to standards from the USDA, emphasizing hygiene and durability for food safety.

Maintenance and Safety

Routine Maintenance Practices

Routine maintenance practices for storage tanks involve systematic procedures to monitor structural integrity, prevent corrosion, and extend operational life, particularly for steel tanks susceptible to environmental wear. These practices focus on regular inspections, cleaning, and targeted repairs to address common degradation issues without requiring full shutdowns where possible. Adherence to established protocols, such as those outlined in industry standards, ensures tanks remain safe and efficient over decades of service. Inspection schedules form the cornerstone of routine maintenance, with visual and external assessments typically conducted annually to identify surface anomalies, leaks, or foundation issues through walk-around checks of the tank shell, roof, and supports. ^[87] Internal inspections, requiring draining and entry, must occur no later than 10 years after commissioning, with subsequent intervals not exceeding 10 years unless extended based on corrosion rates, fitness-for-service evaluations, and conditions such as release prevention barriers, as specified in API 653 guidelines for aboveground storage tanks. ^[88] ^[89] Ultrasonic thickness testing is integrated into these routines to measure shell and bottom plate thinning due to corrosion, often performed during external checks every five years or as part of internal evaluations to quantify material loss and predict remaining life. ^[90] Cleaning methods emphasize safe removal of residues and sediments to maintain tank functionality and prevent buildup-related failures. Hydroblasting, using high-pressure water jets up to 40,000 psi, effectively clears sludge, scale, and hydrocarbon deposits from tank interiors without introducing contaminants, making it suitable for petroleum and chemical storage applications. ^[91] Cathodic protection monitoring involves periodic checks of impressed current or sacrificial anode systems to ensure adequate electrical potential is maintained, typically measured annually via reference electrodes to verify corrosion prevention on tank bottoms and exteriors. ^[92] Common maintenance tasks include repairing roof seals on floating-roof tanks to restore vapor-tight integrity, often involving replacement of worn shoe or wiper seals during out-of-service periods to minimize emissions and structural stress. ^[93] Bottom sump draining is performed routinely, such as monthly or quarterly, to remove water accumulation and sediments that accelerate corrosion, using pumps to evacuate low points in the tank floor and prevent underbottom pitting. ^[94] Coating reapplications, essential for internal and external protection, are generally scheduled every 15 years for high-durability linings in moderate environments, involving surface preparation and application of epoxy or polyurethane systems to inhibit further degradation. ^[95] Emerging tools and techniques enhance efficiency in accessing hard-to-reach areas and anticipating issues. Drones equipped with high-resolution cameras and thermal sensors enable non-intrusive inspections of tank roofs, shells, and internals, reducing the need for scaffolding and human entry while capturing detailed imagery for defect analysis. ^[96] Predictive analytics via embedded sensors, which gained traction in the 2020s, use real-time data on vibration, pressure, and corrosion rates to forecast maintenance needs, allowing proactive interventions through IoT-integrated platforms that analyze trends and alert operators to potential failures. ^[97]

Safety Standards and Regulations

Safety standards and regulations for storage tanks encompass a range of international and national guidelines focused on design, construction, operation, and environmental protection to mitigate risks associated with leaks, overpressurization, and spills. In the United States, the American Petroleum Institute (API) Standard 650 provides comprehensive requirements for the design, fabrication, erection, and inspection of welded steel tanks for oil storage, emphasizing structural integrity and material specifications for atmospheric and low-pressure applications.^[5] Complementing this, API Recommended Practice 651 outlines cathodic protection methods to prevent corrosion in aboveground petroleum storage tanks, including criteria for impressed current and sacrificial anode systems. For handling hazardous liquids, the Occupational Safety and Health Administration (OSHA) standard 29 CFR 1910.106 regulates the storage of flammable and combustible liquids, mandating specific tank venting, spacing, and emergency venting to prevent explosions and fires.^[25] In the European Union, the Pressure Equipment Directive (PED) 2014/68/EU harmonizes rules for pressure equipment exceeding 0.5 bar, requiring conformity assessments, material traceability, and safety factors for tanks used in pressurized service. Environmental regulations prioritize spill prevention and containment to protect waterways and ecosystems. Under the U.S. Environmental Protection Agency (EPA), the Spill Prevention, Control, and Countermeasure (SPCC) rule (40 CFR 112) requires facilities with aboveground oil storage capacity exceeding 1,320 gallons to develop and implement plans for secondary containment, inspections, and response procedures to avert discharges into navigable waters.^[98] Secondary containment systems must be capable of holding the volume of the largest single tank plus sufficient freeboard for precipitation, often achieved through dikes, liners, or double-walled designs, with impervious materials to prevent permeation.^[99] SPCC plans should incorporate assessments of environmental risks, including potential climate impacts such as flooding and corrosion from changing conditions, as recommended in EPA guidance. Global variations address region-specific hazards, such as seismic activity. The International Organization for Standardization (ISO) 28300 specifies venting requirements for atmospheric and low-pressure storage tanks in the petroleum and petrochemical industries, covering normal operations, thermal expansion, and emergency relief to avoid overpressure.^[100] In high-risk seismic areas like Japan, the Architectural Institute of Japan's Design Recommendation for Storage Tanks and Their Supports emphasizes seismic design, including sloshing loads, anchor bolt detailing, and response spectra analysis tailored to local ground accelerations exceeding 0.3g.^[101] In the 2020s, updates to storage tank standards increasingly incorporate climate resilience and digital technologies. The EPA finalized New Source Performance Standards (NSPS) for volatile organic liquid (VOL) storage tanks (40 CFR Part 60, Subpart Kc, October 2024), which lower emission thresholds to ≥0.25 psia maximum true vapor pressure for applicability (≥20,000 gallons capacity) and require enhanced controls, continuous monitoring, testing, and electronic reporting for new, reconstructed, or modified tanks to reduce VOC emissions.^[102] These updates promote digital tools like automated sensors for real-time leak detection and predictive maintenance, while encouraging consideration of climate impacts such as extreme weather in planning.^[103]

Risks and Failures

Common Failure Modes

Storage tanks are susceptible to corrosion, which manifests as the gradual deterioration of tank materials due to chemical reactions with stored substances or the surrounding environment. Internal corrosion often occurs as pitting, where localized attacks from corrosive chemicals like hydrogen sulfide in sour crude oil create deep pits that weaken the tank shell and floor over time. External corrosion, particularly in underground or soil-contacting tanks, arises from moisture, oxygen, and electrolytes in saline soils, with typical rates ranging from 0.1 to 0.5 mm/year in aggressive environments, accelerating leakage risks if protective coatings fail. Structural failures represent another prevalent issue, often stemming from mechanical overloads or fabrication imperfections. Roof collapse can result from excessive snow accumulation, imposing loads that exceed design capacities and cause buckling or deformation in fixed-roof tanks, especially in regions with heavy winter precipitation. Seam leaks frequently originate from welding defects during construction, such as incomplete fusion or porosity, which propagate under operational stresses and lead to progressive breaches along shell joints. Overfilling incidents contribute to overflows and structural distress by generating hydrostatic pressures that distort the tank bottom or shell, potentially causing rim space overflows or even rupture if level controls malfunction.^[104] Additional failure modes include thermal stress cracks, foundation settlement, and ignition hazards. Thermal stresses arise in heated tanks, such as those storing molten salts or hot process fluids, leading to cracking in welds or base metal due to differential expansion and contraction, particularly in austenitic stainless steels prone to stress relaxation cracking. Foundation settlement induces tank tilt, where uneven soil consolidation causes differential movements up to 1:120 allowable limits, distorting the shell and risking bottom-seam failures if exceeding tolerances like 1 in 10 ft. Vapor ignition from static electricity occurs during filling or cleaning operations, where charge buildup in low-conductivity fluids generates sparks capable of igniting flammable vapors above the liquid level.^[105]^[106] To mitigate these risks, operators employ Failure Mode and Effects Analysis (FMEA), a systematic methodology that identifies potential failure modes, assesses their severity, occurrence, and detectability, and prioritizes preventive measures like enhanced coatings, regular ultrasonic inspections, and grounding systems. This approach, aligned with standards such as API 653, enables proactive risk assessments to extend tank integrity and avert catastrophic releases.

Notable Incidents

One of the most catastrophic storage tank incidents occurred on December 2-3, 1984, at the Union Carbide pesticide plant in Bhopal, India, where water entered a methyl isocyanate (MIC) storage tank (E610) due to a faulty valve and inadequate safety measures during maintenance, triggering an exothermic reaction that released 23-42 tons of toxic MIC gas.^[107] The leak exposed over 500,000 people, resulting in approximately 15,000 deaths over time and 200,000 injuries, including long-term respiratory, ocular, and reproductive health effects, with ongoing soil and water contamination from heavy metals like mercury at levels six million times above standards.^[107] This disaster highlighted deficiencies in tank design, safety instrumentation, and emergency response, leading to global scrutiny of chemical storage practices and stricter international regulations on hazardous material handling.^[107] In the UK, the Buncefield oil storage depot explosion on December 11, 2005, at the Hertfordshire terminal, stemmed from the overfilling of Tank 912 due to the failure of its automatic tank gauging system and independent high-level switch, exacerbated by design flaws, poor maintenance, and inadequate management of increased throughput.^[108] The overflow formed a vapor cloud that ignited, engulfing over 20 tanks in a fire that burned for five days, injuring more than 40 people, polluting local aquifers with hydrocarbons, and causing economic losses exceeding £1 billion, though no fatalities occurred.^[108] The incident led to reforms in the Control of Major Accident Hazards (COMAH) regulations, including enhanced process safety leadership, improved overfill prevention, and mandatory safety critical element assessments for fuel storage sites.^[109] A more recent example is the June 21, 2019, fire and explosions at the Philadelphia Energy Solutions (PES) refinery in Pennsylvania, USA, initiated by the rupture of a corroded pipe elbow in the hydrofluoric acid alkylation unit, which released flammable hydrocarbons that ignited and spread to adjacent areas, including storage tanks.^[110] The incident, linked to non-compliance with maintenance standards such as API 653 for tank inspections, resulted in no fatalities but led to the refinery's closure, environmental releases of hydrofluoric acid affecting nearby communities, and a $4.2 million EPA settlement for Clean Air Act violations.^[110]^[111] The Norilsk diesel spill on May 29, 2020, at a power plant in Norilsk, Russia, involved the collapse of a 6,000-cubic-meter diesel fuel storage tank owned by Nornickel, releasing approximately 21,000 tons of diesel into rivers and tundra due to corrosion at the tank base combined with subsidence from thawing permafrost. The incident, one of the largest oil spills in the Arctic, contaminated over 350 square kilometers, killed aquatic life, and prompted a $2 billion cleanup fine, highlighting vulnerabilities of tanks in permafrost regions to climate change and inadequate corrosion monitoring. It led to stricter Russian regulations on industrial infrastructure in sensitive environments and accelerated Nornickel's tank replacement programs.^[112] These incidents underscore critical lessons in storage tank management, particularly the need for robust overpressure protection systems, such as properly sized relief valves and burst disks, to mitigate risks from filling operations or reactions, as emphasized in standards like API 521.^[113] Enhanced leak detection technologies, including continuous monitoring and automatic shutoff valves, have become standard post-Buncefield and Bhopal to prevent undetected releases.^[114] Overall, they have driven regulatory advancements, including risk-based inspection protocols under API 653 and comprehensive process safety management, reducing recurrence through better design, maintenance, and operator training.^[113]

References

[1]
Tanks - Visual Encyclopedia of Chemical Engineering Equipment
May 6, 2022 · Tanks serve many purposes, including storage, mixing, and chemical processes. Types include storage, settling, pressure vessels, and expansion ...
[2]
Storage Tanks | US EPA
Mar 17, 2025 · Storage tanks are used to hold crude oil, produced water, and gas condensate for brief periods to stabilize flow between continuously producing wells.
[3]
[PDF] User's Guide to TANKS 5.1 - U.S. Environmental Protection Agency
Oct 1, 2024 · If you have no previously saved storage tanks or want to create a new set of tanks, tanks can be ... types of internal floating roof tanks: tanks ...
[4]
API 620 vs. API 650: Which is Best for Your Application? - PALA Group
Jun 12, 2022 · API Standard 650 defines the construction and design regulations for storage tanks that contain chemicals, oil, gas, biofuel, treated water, or ...Missing: definition | Show results with:definition<|separator|>
[5]
API Standard 650, 13th Ed. - API.org
API Standard 650, Welded Tanks for Oil Storage, Thirteenth Edition, has been published to ensure the safety, sustainability, and environmental performance ...Missing: definition | Show results with:definition
[6]
Aboveground Storage Tanks | US EPA
Apr 2, 2025 · Underground Storage Tanks (USTs). Aboveground Storage Tanks. Facilities with aboveground storage tanks (ASTs) holding oils of any kind may be ...
[7]
What are Storage Tanks used for? API 650 - Arveng Training
The different types of tanks are used to store a variety of products such as crude oil and its derivatives, butane, propane, LPG, solvents, water, etc.
[8]
Storage Tanks: Functions, Types and Practical Applications
Dec 14, 2023 · Their main function is to store a variety of materials, from chemicals to foodstuffs and water. These are just some of the many applications for ...
[9]
Storage Tank Applications - American Alloy Fabricators
Feb 22, 2024 · They serve different purposes, such as storing water, chemicals, or petroleum products. Moreover, they are crucial in industrial settings.
[10]
https://millsequipment.com/pages/tank-capacity-charts
[11]
How Big Are Field-Erected Tanks?
Dec 4, 2024 · Field-erected tanks can range in size from several thousand gallons to tens of millions of gallons, depending on the industry and application.
[12]
Global Storage Tank Market Size Report 2025, Analysis To 2034
The storage tank market size has grown steadily in recent years. It will grow from $15.08 billion in 2024 to $15.49 billion in 2025 at a compound annual growth ...
[13]
Tank - Etymology, Origin & Meaning
Originating from Hindi and Sanskrit via Portuguese, "tank" means a water reservoir and evolved to also signify plunging into a tank and an armored vehicle.
[14]
https://www.merriam-webster.com/dictionary/tank
[15]
tank, n.¹ meanings, etymology and more | Oxford English Dictionary
A pool or lake, or an artificial reservoir or cistern, used for purposes of irrigation, and as a storage-place for drinking-water.
[16]
Sustainably Managing Reservoir Storage: Ancient Roots of a ... - MDPI
An impoundment dam was built early in the history of the settlement (radiocarbon dated between 3500 and 3000 BCE, [59], see Figure 3) that held back the flow of ...
[17]
Storage Practices and Temple Economy During the 3rd Millennium ...
Their distribution suggested shifts in administrative practices, particularly evident at sites like Khafaja and Nippur. Related papers.
[18]
The Aqueducts and Water Supply of Ancient Rome - PubMed Central
Ancient Rome contained “a number of large cisterns and reservoirs … in which water could have been stored during the night” (Bruun 1991, 373). Figure 1 ...
[19]
The History of the Oak Barrel: From Ancient Times to Modern Day
Mar 17, 2025 · They influenced the flavor and texture of wine and spirits through practical storage methods, such as food, water, and oil storage.
[20]
Medieval Monday: Making Barrels and Wooden Vessels
May 28, 2018 · They were reserved for use on some buckets and expensive drinking vessels. Barrel hoops were made of wood, primarily willow, ash, hazel, and ...
[21]
Petroleum Storage Tanks - Engineering and Technology History Wiki
Aug 13, 2021 · Wooden and arc-welded mild steel tanks existed in petroleum fields until the early 20th century, while in the refineries metal ones were mostly ...
[22]
Derricks of Triumph Hill - American Oil & Gas Historical Society
Triumph Hill saw an 1866 oil discovery, with derricks replacing trees, producing 2,000 barrels daily by 1867, and was considered a top producing area.Missing: welded steel
[23]
[PDF] Historical Publications - API.org
Historical API publications include Chapter 11.1, volume correction factors, and tables for various applications, including volume and density corrections. ...
[24]
Horace Horton's Spheres - American Oil & Gas Historical Society
Chicago Bridge & Iron Company in the 1920s patented the “Hortonsphere,” today vital for storing and transporting liquified natural gas (LNG).
[25]
Milestones In The Underground Storage Tank Program's History ...
A US Environmental Protection Agency timeline about the national underground storage tank (UST) program.<|separator|>
[26]
Crash-proof and sustainable polymer-based composites in modern ...
Due to their superior corrosion resistance, temperature resistance capabilities, high stiffness, strength, and wear qualities, polymers (thermoplastics and ...
[27]
Protect Tanks from Overpressure and Vacuum - AIChE
Tank overpressure and vacuum scenarios API Standard 2000 defines the venting requirements for atmospheric and low-pressure storage tanks for both overpressure ...
[28]
Types and Classes of Pressure Tanks - IQS Directory
API 650 Welded Steel Tank for Storage - often specified for services other than oil - Maximum pressure 2.5 PSI / maximum temperature 90°C / non-refrigerated.
[29]
High Pressure Storage - CB&I
High-pressure storage is used in industries like marine terminals and refineries. Hortonsphere vessels store liquids and gases, including propane, butane, and ...
[30]
Storage tanks, Fixed and Floating roof tanks - Wermac
The first four tank types are cylindrical in shape with the axis oriented perpendicular to the sub grade. These tanks are almost exclusively above ground.
[31]
Different Type of Storage Tanks and its uses - Velosi Insights
Apr 8, 2022 · TYPES OF STORAGE TANKS · Fixed-roof tanks · External floating roof tanks · Internal floating roof tanks · Domed external floating roof tanks ...
[32]
Types of Storage Tanks - T Bailey Inc
Dec 8, 2020 · Fixed roof tanks are cylindrical steel-welded tanks that have a cone or dome-shaped roof permanently attached to the tank's shell. Generally, ...
[33]
Differences Between Fixed and Floating Roof Tanks Explained
Feb 28, 2024 · Fixed and floating roof tanks are vital components in industrial storage, offering distinct advantages in containment and vapor reduction.
[34]
Pressure Vessel, Thin Wall Hoop and Longitudinal Stresses
Dm = Mean Diameter (Outside diameter - t). Mean diameter of OD and ID... σθ = is the hoop stress. The hoop stress equation for thin shells is also approximately ...Missing: storage | Show results with:storage
[35]
Stiffening Ring - an overview | ScienceDirect Topics
A stiffening ring causes longitudinal bending stresses in the shell immediately adjacent to the ring due to differential radial deflection between the vessel ...
[36]
[PDF] API 650: Welded Steel Tanks for Oil Storage
Dec 5, 2012 · API 650 is a standard for welded steel tanks for oil storage, meant as a purchase specification for the petroleum industry.<|separator|>
[37]
[PDF] API 620: Design and Construction of Large Welded Low Pressure ...
Feb 1, 2012 · The rules presented in this standard apply to vertical, cylindrical oil storage tanks built according to API Standard. 650 as specifically ...
[38]
API STD 620 - Webstore | Standards
Apr 13, 2018 · This standard covers the design and construction of large field-assembled, welded, low-pressure carbon steel above ground storage tanks.
[39]
[PDF] Pressure relief considerations for low-pressure (atmospheric ...
In terms of the design and fabrication of the tank, BS 2594, BS 2654,. API 620 and API 650 are the most commonly used. API 2000 is the most commonly used ...
[40]
Low-Pressure Storage Tanks - an overview | ScienceDirect Topics
Low pressure tanks are designed to withstand internal pressure in the range 0.5–15 psig. The design of low pressure tanks is governed by API Std 620.
[41]
Secondary containment systems (Bunding) | NetRegs
Secondary containment systems (SCS) are used to catch any leaking oil, overfilling or other spills from a primary container, such as a tank, and its pipework.
[42]
[PDF] Low Temperature & Cryogenic - CB&I
This configuration is used for storage of low temperature and cryogenic liquids. The design features a primary.
[43]
What are cryogenic double-walled tanks and how are they made?
Cryogenic double-walled tanks (DWT) are engineered to house liquid gases like LNG (liquefied natural gas) or liquid nitrogen at extremely low temperatures.
[44]
Pressure Vessel Fatigue
This article takes a more detailed look at metal fatigue including testing for fatigue, conditions affecting fatigue life of a pressure vessel, and examining ...
[45]
Thin Wall Pressure Vessels ASME Equation and Calculator
The formulae in ASME Section VIII, Division 1, paragraph UG-27, used for calculating the wall thickness and design pressure of thin wall pressure vessels.
[46]
Internal pressure design calculation of cylinders - cis-inspector.com
ASME Code Section VIII, Division 1, 2021 Edition offers four different formulas for the internal pressure design calculation of cylinders.
[47]
Have you ever wondered, How ASME formula of thickness was ...
Oct 18, 2023 · ASME needed an equation that could predict stresses accurately for both thin and thick shells, so it adopted a formula that could cater to both cases.
[48]
ASME Section VIII Spheres and Bullets - TF Warren Group
Spherical shaped storage in the form of ASME pressure vessels are used in gas and liquid storage in many industries including midstream, downstream, chemical, ...
[49]
LPG Storage Bullet Tanks vs. LPG Storage Spheres / 'Hortonspheres'
Nov 14, 2016 · With their unique, entirely rounded profile, Hortonspheres allow for efficient, large volume storage of compressed gases in a liquid stage. With ...
[50]
Fatigue life prediction and verification of high-pressure hydrogen ...
A fatigue life prediction method is developed for the high-pressure hydrogen storage vessel based on theoretical research and experimental verification.
[51]
[PDF] Thermal Storage Performance in Heat Pump Water Heating Systems
Additionally, thermal losses tend to degrade stratification. Tanks offered today provide between R-12 and R-30 insulation. More research is needed to fully ...
[52]
Stratified Thermal Energy Storage Tanks functioning - ARANER
Stratified TES Tanks' design encourages their correct operation. Their extensive height allows the water to form heat layers (stratification), which is a ...
[53]
Chilled & Hot Water Buffer Tanks | www.tacocomfort.com
Buffer Tanks are often employed within HVAC systems to provide additional system fluid volume in order to prevent short cycling of heating or cooling apparatus.
[54]
Phase Change Material for Efficient Heat Pump Water Heating
Nov 12, 2024 · PCM can store thermal energy at densities up to four times greater than water due to its latent heat capacity. This means that PCM can provide ...
[55]
Study on Phase Change Materials' Heat Transfer Characteristics of ...
Oct 23, 2024 · Furthermore, the phase change storage tank achieves higher heat storage (27%) and exergy storage efficiency (18%) compared to the stored tank ...
[56]
How Does Anaerobic Digestion Work? | US EPA
Dec 31, 2024 · Anaerobic digestion is a process through which bacteria break down organic matter—such as animal manure, wastewater biosolids, and food wastes— ...
[57]
Food Grade Stainless Steel Milk Storage Silos - Anco Equipment
Our silos are constructed with 304 or optional 316 Stainless Steel and have a beautiful food-grade No. 4 Finish and a dimple plate jacket for effective cooling.
[58]
Vertical milk cooling tanks (Silo) 5,000 to 50,000 litres - Wedholms
The robust silo tanks in stainless steel can hold 5,000 to 50,000 litres of milk and are offered in two diameters for increased flexibility.<|separator|>
[59]
Tanks and Vessels - Applications - Heat Trace
Heat tracing is applied to tanks and vessels to ensure that products are stored at the correct temperature. Usually the system is designed to compensate for ...
[60]
Double-walled stainless steel tanks | Gpi Tanks
Gpi Tanks offers double-walled stainless steel tanks, ensuring superior insulation and safety for storing various liquids. Durable, reliable, and designed ...
[61]
Development status and prospect of underground thermal energy ...
Mar 15, 2024 · Underground Thermal Energy Storage (UTES) store unstable and non-continuous energy underground, releasing stable heat energy on demand.Missing: renewables 2020s
[62]
Progress in underground thermal energy storage - IDEAS/RePEc
The results indicate that the UTES field has undergone three stages of development: embryonic, stable growth, and rapid expansion, with large-scale ...
[63]
The Importance of Crude Oil Storage Terminals - The Tank Tiger
Mar 27, 2024 · This design helps to minimize the amount of vapor space above the oil, reducing the risk of evaporation and emission of volatile organic ...
[64]
Floating Roofs for Crude Oil Tanks - Center Enamel
Drastically reduce VOC and H_2S emissions, prevent fires, and preserve crude oil value in Crude Oil Tanks with advanced Floating Roofs.
[65]
Lesson 3: Overall Refinery Flow - Penn State
Apr 15, 2013 · That is essentially propane and butane. The light straight-run naphtha coming from the light ends unit go through blending to the gasoline pool.
[66]
https://www.api.org/products-and-services/individual-certification-programs/certifications/api653
[67]
API 650 OIL STORAGE TANK DESIGN CALCULATION - ExcelCalcs
Apr 28, 2023 · This standard covers tanks with a diameter greater than 30 feet (9.144 meters) and capacities up to 500,000 barrels (79,500 cubic meters).
[68]
API 653 - Aboveground Storage Tank Inspector
The API 653 Aboveground Storage Tank Inspector must have a broad knowledge base relating to tank inspection and repair of aboveground storage tanks.
[69]
Refinery Blending - Technics
Technics Blending Solutions can be extended to Refinery Systems where feedstocks are homogenized to produce Gasoline, Diesel, and other Fuels.
[70]
[PDF] Tank mixing in terminal operations - Port Technology
Tank mixing in terminals handles different fuel grades, prevents deposition, and ensures bottom-to-top mixing using propellers, and side-entry mixers prevent ...
[71]
The Rise of Aboveground Storage Tank, Global trends - DirecTank
Aug 9, 2023 · Oil and gas industry utilizes ASTs to store crude oil, refined petroleum products, and other hydrocarbons. The U.S. alone has over 600,000 ...
[72]
[PDF] Crude Oil Storage: Quality, Safety, & Refinery Markets
Our breakout tanks are regulated as part of the interstate pipeline system and offer safety control points along the route supplemented by isolation valves and ...
[73]
Oil Terminals and Storage – A Critical Factor of Logistics
Sep 6, 2021 · An oil terminal is an industrial site where oil is loaded or unloaded for storage or transportation via pipelines or tankers.
[74]
[PDF] Flaring management guidance - The World Bank
# Flaring of gas production that exceeds existing gas infrastructure capacity. # Flaring from process units such as oil storage tanks, tail gas treatment ...
[75]
The Strategic Petroleum Reserve: History, Perspectives, and Issues
The capacity of the SPR is 727 million barrels, and by the end of 2009, was virtually filled to its capacity at 726 million barrels of crude oil. In addition, a ...
[76]
The 1973 Oil Crisis: Three Crises in One—and the Lessons for Today
Oct 16, 2023 · By the third quarter of 1973, the market was very tight, with only about 1 percent of spare capacity, which basically meant that there was no ...Missing: history | Show results with:history
[77]
[PDF] chemical storage, handling and application - KDHE
Nov 3, 2008 · Storage tanks should be constructed of FRP, polyethylene, or steel lined with rubber or polyethylene (White 1999); but the resin used in an ...
[78]
[PDF] FEASIBILITY REVIEW OF FRP MATERIALS FOR STRUCTURAL ...
Storage tanks for liquids are ideal application of FRP using corrosion and solvent resistant resins. FRP tanks are easy to install, more economical than the ...
[79]
Chemical Process Technologies: Batch Reactor - Stoli Chem
Sep 26, 2020 · Batch, or stirred tank reactors are simply vessels that hold the reactants and allow them to mix. The batch reactor contains 4 main components.
[80]
Dry Bulk Tanks and Storage Silo Systems - CMT Process Solutions
CMT's storage silos are designed for the reliable storage and handling of dry bulk materials, including grains, cement, coal, plastics, and powders.
[81]
Mobile Cement Silos | MERIDIAN® Manufacturing
Built for to be tough and efficient, these portable silos streamline the onsite storage and transfer of cement and other bulk powders – ideal for concrete ...
[82]
Advanced Scientific Sterile Single-Use Tank Liners - Cole-Parmer
In stock 4-day delivery 30-day returnsThese sterile tank liners are ready for immediate use. Designed for the biopharmaceutical industry, these liners help eliminate risk of cross contamination.
[83]
40 CFR Part 265 Subpart J -- Tank Systems - eCFR
(1) For non-enterable underground tanks, a leak test that meets the requirements of § 265.191(b)(5) must be conducted at least annually;. (2) For other than non ...
[84]
[PDF] Standards for Hazardous Waste Storage and Treatment Tank ...
(1) A leak test of every underground tank to detect any leak equal to or greater than 0.05 gallon per hour;. (2) A leak test of all underground piping to ...
[85]
Frequent Questions About Underground Storage Tanks | US EPA
The hazardous substance UST must use interstitial monitoring for leak detection. Interstitial monitoring can indicate the presence of a leak in the confined ...
[86]
What are the various types of Batch Reactor and their Applications?
Jul 22, 2022 · A batch reactor is indeed a storage tank that comes with an agitator and a built-in heating/cooling system. Their capacity ranges from a few ounces to over ...
[87]
Application of spherical tank in petrochemical industry
Jan 27, 2024 · These tanks are usually used as pressure tanks to store and maintain liquids and gases, crude oil, oil derivatives and chemical products.
[88]
A Clear and Simple Guide to Annual Storage Tank Inspections
Feb 3, 2025 · It's vital to conduct annual tank inspections to keep the chemical tanks, fittings, venting and accessories in good condition and to avoid ...
[89]
[PDF] API 653: Tank Inspection, Repair, Alteration, and Reconstruction
API 653 provides guidance for the inspection, repair, alteration, and reconstruction of steel storage tanks in the petroleum and chemical industries.
[90]
https://ttienvinc.com/blog/quick-overview-of-storage-tank-inspection-standards/
[91]
Industrial & Fuel Tank Cleaning Services - Clean-Co Systems
Our automated hydroblasting technology removes tough deposits with precision, operating at pressures up to 40,000 psi. This method effectively eliminates ...Missing: cathodic | Show results with:cathodic
[92]
What is Cathodic Protection Monitoring? - Mobiltex
One of the most important aspects of operating CP systems is ensuring proper functionality and providing optimal protection to pipelines and storage tanks.
[93]
Seal Repair – Replacement - Advance Tank & Construction
Advance Tank regularly performs tank seal replacements. Optimally, we perform seal replacements when a tank is out-of-service. This is done for several reasons.
[94]
[PDF] Underground Storage Tank Sump Maintenance - PDH Online
This manual covers inspection guidelines, best practices, and simple maintenance steps for sumps, including identifying and inspecting them, and fixing common ...
[95]
[PDF] Finished Water Storage Facilities
Aug 15, 2002 · This survey also showed that most tanks are painted (exterior coating) on an interval of 10 to 15 years. Each of the coating systems listed ...<|separator|>
[96]
Storage Tank Inspections | API 653 Compliant - TechCorr
API 653-certified tank inspections using MFL, ultrasonic crawlers & drones. Prevent leaks with our comprehensive shell, floor & roof assessments.<|separator|>
[97]
Predictive Maintenance and Fuel Tanks: Unpacking the Benefits
Apr 1, 2025 · Improved Efficiency: Sensors installed in fuel tanks can monitor parameters like fuel level, pressure, and temperature in real time. Combined ...Missing: 2020s | Show results with:2020s
[98]
https://www.epa.gov/oil-spills-prevention-and-preparedness-regulations/spill-prevention-control-and-countermeasure-spcc
[99]
Spill Prevention, Control, and Countermeasure (SPCC) for Agriculture
The SPCC rule aims to prevent oil discharge into water and requires farms to develop and implement an SPCC plan to prevent and control oil spills.
[100]
Secondary containment for each container under SPCC | US EPA
May 22, 2025 · Facilities must construct all bulk storage container installations (except mobile refuelers) to provide a secondary means of containment for the entire ...
[101]
ISO 28300:2008 - Petroleum, petrochemical and natural gas industries
In stock 2–5 day deliveryISO 28300:2008 covers the normal and emergency vapour venting requirements for aboveground liquid petroleum or petroleum products storage tanks.
[102]
[PDF] Design-Recommendation-For-Storage-Tanks-And-Their-Supports ...
The Architectural Institute of Japan set up a “Sub-Committee for Design of Storage Tanks” to provide a recommendation of the seismic design for the various ...
[103]
U.S. EPA Has Revised its Standards for New and Modified Volatile ...
Nov 13, 2024 · New EPA standards for volatile organic liquid storage tanks are here. See how these revised regulations impact your business. Learn more!
[104]
The Hidden Dangers of API 650 Storage Tanks: How to Avoid Costly ...
Oct 19, 2024 · Common Cause of API 650 Storage Tank Failures · 1. Overfilling · 2. Failure of the PVRV breaker · 3. Corrosion · 4. Structural damage · 5. Foundation ...
[105]
Tackling Weld Failures in Thermal Energy Storage Tanks
Jun 1, 2025 · 347H austenitic stainless steel used in the manufacture of molten salt tanks can be subject to severe stress relaxation cracking (SRC).
[106]
Static Control to Prevent Storage Tank Fires - Lightning Master
Mar 10, 2017 · There are two related causes of ignition in storage tanks: static from normal tank operations and static from a direct or nearby strike.
[107]
[PDF] The Bhopal tragedy Night of December 2 to 3, 1984 - ARIA
Jun 7, 2010 · According to an official report compiled by Indian authorities, there were 1,754 killed and 170,000 intoxicated, 12,000 of whom were in critical ...
[108]
[PDF] The Flixborough disaster Report of the. Court of Inquiry - IChemE
Jun 27, 1974 · The Flixborough disaster was a formal investigation into an accident on June 1, 1974, at the Nypro factory, directed by the Secretary of State.
[109]
[PDF] COMAH - Buncefield: Why did it happen? - IChemE
Dec 11, 2024 · The explosion and fire at the Buncefield oil storage depot in 2005 was a significant event. As part of the work of the MIIB, the Health and ...
[110]
[PDF] The Buncefield Investigation Cm. 7491 - GOV.UK
Responding to Buncefield and securing improvements at fuel storage depots has been an important priority for the COMAH Competent Authority (CA). The. CA will ...
[111]
CSB Releases Final Report into 2019 PES Fire and Explosion in ...
Oct 11, 2022 · The incident occurred when a corroded pipe elbow ruptured, releasing process fluid into the refinery's hydrofluoric acid (HF) alkylation unit.
[112]
EPA to collect $4.2 million over 2019 Philly refinery fire - WHYY
Oct 8, 2024 · The federal agency claims Philadelphia Energy Solutions failed to properly monitor a burst pipe that started the fire.
[113]
Lessons learned from recent fuel storage fires - ScienceDirect.com
This paper aims to bring some essentials related to the hazards that arose from recent fuel storage fire accidents occurring in Buncefield, UK (2005), Puerto ...