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Davit

A davit is a crane-like device, typically consisting of a curved or straight arm mounted on a ship's deck or offshore platform, designed for supporting, raising, and lowering heavy equipment such as lifeboats, anchors, or tenders with minimal manual effort.^[1] Often arranged in pairs, davits function as specialized jib cranes that ensure safe and efficient handling of loads in maritime environments.^[2] The term "davit" originates from the 14th century, derived from the Anglo-French word daviot, a diminutive form of Davi, meaning David, reflecting its early association with simple lifting mechanisms named after a biblical figure.^[3] Historically, davits evolved from basic wooden structures used for launching lifeboats to more advanced systems integral to maritime safety, particularly after high-profile incidents like the Titanic disaster in 1912, which highlighted the need for reliable lifeboat deployment.^[4] Today, they are essential components on vessels ranging from cargo ships to offshore oil platforms, regulated under international standards such as those from the International Maritime Organization (IMO) to ensure operational integrity during emergencies.^[5] Davits come in several types tailored to specific maritime needs. Gravity davits rely on the weight and balance of the load for lowering, featuring no electrical components and serving as a primary emergency mechanism for lifeboats on passenger and cargo ships.^[6] Electric davits, powered by motors, provide automated lifting for lighter applications like tenders or jet skis on pleasure crafts.^[6] Hydraulic davits offer precise control and high power for heavy loads in industrial settings, such as deploying rescue boats or supplies.^[6] Load capacities vary widely, from 200 pounds (91 kg) for small tenders to over 35,000 pounds (16,000 kg) for large lifeboats, with designs tested for durability against harsh sea conditions.^[7] In addition to life-saving functions, davits support routine operations like retrieving anchors, handling various equipment and provisions in commercial shipping, and facilitating fishing activities by hoisting nets or equipment.^[8]^[6] Their role extends to confined space entry in industrial maritime contexts, where they enable safe worker retrieval from hazardous areas.^[9] Modern davit systems incorporate safety features like off-load release mechanisms and winches, mandated by regulations such as 46 CFR Part 133 for U.S. vessels, to prevent accidents during deployment.^[10]

History

Early Origins

The term "davit" originates from Middle English "daviot," derived from Anglo-French and Middle French "daviet," a diminutive of "david," referring to a joiner's cramp or clamp, likely named after the biblical figure David.^[11] In its earliest nautical application, a davit consisted of curved wooden projections extending over a ship's side, functioning as simple supports or booms to hold and suspend heavy items securely. These wooden structures, sometimes referred to as "davies" in pre-17th-century records, were integral to sailing vessels for managing equipment without relying on makeshift rigging.^[12] The earliest documented uses of davits in naval contexts date to the late 18th century, particularly on whaling and merchant ships, where they suspended anchors, small boats, or cargo to facilitate loading and unloading at sea; some accounts suggest use in whaling fleets as early as the 17th century.^[12]^[13] Fixed wooden davits built into the ship's structure over the stern or quarters allowed for more stable storage of launches and longboats, marking a key advancement in shipboard efficiency during the age of sail. This adoption was widespread on European vessels by the late 1600s, enhancing safety and operational speed on long voyages, though formal naval records indicate later standardization.^[12] By the 1790s, the Royal Navy introduced quarter davits—curved arms positioned at the ship's quarters—to improve access to boats during maneuvers or emergencies, replacing less reliable improvised supports.^[12] This innovation, detailed in naval construction records, allowed for quicker deployment of small craft from the sides, vital for reconnaissance and rescue operations. Around 1800, the transition to transom davits occurred, mounting supports at the stern to better accommodate lifeboats and cutters, further streamlining stern-based launches on wooden warships and merchantmen. These developments represented pivotal historical adaptations, enabling navies to overcome the challenges of manual boat handling on pre-industrial vessels.^[12] These early wooden designs laid the groundwork for the more complex davit systems that would emerge later.^[14]

Modern Innovations

In the late 19th and early 20th centuries, significant advancements in davit design emerged through patented innovations that improved efficiency and reliability in lifeboat deployment. A pivotal development was the Welin Quadrant davit, invented by Swedish engineer Axel Welin and patented in 1902 (filed 1901), which featured a toothed quadrant gear mechanism at the base of the davit arms. This design allowed for smoother swinging of lifeboats outboard from the ship's side using a rack-and-pinion system, reducing the manpower required and enabling faster operation compared to earlier pivot-based models. The Welin Davit & Engineering Company, established in London in 1901, commercialized this invention, making it the industry standard with over 4,000 units sold by the mid-20th century.^[15]^[16]^[17] These quadrant davits were notably installed on the RMS Titanic in 1912, where sixteen sets supported the ship's lifeboats, demonstrating their capacity to handle multiple boats from a single position. However, the design's limitations became evident during the disaster, as the davits' sequential swinging and lowering process—requiring manual cranking and precise coordination—contributed to delays in evacuating passengers, with only about half the lifeboat capacity utilized before the ship sank. This highlighted the need for further refinements in speed and capacity, influencing subsequent maritime safety regulations. Parallel to these mechanical improvements, the early 20th century saw a material shift in davit construction from wood to steel, driven by the broader transition in shipbuilding toward iron and steel hulls for enhanced strength and resistance to marine environments. Wooden davits, prone to rot and warping, were largely replaced by steel frames by the 1910s, as seen in Welin's designs, which improved load-bearing capacity and longevity under harsh conditions. This change aligned with industrial advancements in steel production, allowing for more robust, corrosion-resistant components.^[15] By the mid-20th century, gravity and radial davits were introduced to address deployment speed, particularly for larger vessels. Gravity davits, patented by Dutch inventor Ane Pieter Schat in 1920, utilized the boat's weight to initiate lowering along tracks, minimizing manual effort and enabling quicker launches even in rough seas. Radial davits, an evolution of earlier swinging types and common on late 19th- and early 20th-century merchant and naval ships, featured pivoting arms that radiated outward for boat handling. These designs prioritized rapid response, building on earlier principles but optimizing for emergencies.^[18]^[19] Following World War II, innovations focused on automation and scalability for massive post-war fleets. Hydraulic assistance was integrated into davit systems in the mid-20th century, using fluid-powered rams to swing and lower boats with reduced crew involvement. Standardized designs, codified in international conventions like SOLAS 1960, ensured uniformity across larger ships, incorporating modular steel components for easier maintenance and higher capacities up to 150 persons per boat. These advancements reflected lessons from wartime evacuations, emphasizing reliability and speed.^[20]

Types

Maritime Davits

Maritime davits are essential shipboard equipment designed for the safe launching and recovery of lifeboats and rescue craft during emergencies, ensuring compliance with the International Convention for the Safety of Life at Sea (SOLAS). These davits must operate reliably under conditions such as vessel heel up to 20 degrees and trim up to 10 degrees, supporting the rapid evacuation of personnel.^[21] They vary in design to accommodate different ship types, from cargo vessels to large passenger liners, prioritizing speed, safety, and ease of maintenance. Gravity davits employ sloping tracks that allow the lifeboat to descend using its own weight, secured by gripes in the stowed position for stability.^[22] This type is prevalent on cargo ships due to its simplicity and ability to function at a 15-degree heel, enabling quick manual or powered recovery.^[22] Radial or swing davits feature pivoting arms that rotate the lifeboat outboard over the water, facilitating controlled positioning before gravity-assisted lowering.^[21] Commonly installed on passenger vessels, they use hydraulic or manual systems for swinging and hoisting, with wire falls for precise descent, enhancing operational flexibility in crowded deck areas.^[21] Telescopic davits incorporate extendable arms that luff outward via hydraulic power, ideal for handling larger lifeboats on cruise ships.^[23] The boat lowers by gravity along the extended arms and is recovered using the winch system, accommodating greater outreach and load handling in space-constrained environments.^[23] These davit types differ primarily in deployment mechanics and suitability for vessel scale, with load capacities typically supporting lifeboats for up to 150 persons under SOLAS Chapter III, as required by the LSA Code.^[24]

Industrial Davit Cranes

Industrial davit cranes represent an adaptation of traditional maritime lifting technology for land-based industrial environments, evolving from shipboard designs used for lifeboat deployment to modular, versatile systems to meet the needs of factories, construction sites, and maintenance operations.^[25]^[26] These cranes retain a basic swinging motion borrowed from maritime types but prioritize stationary or semi-portable configurations for overhead lifting of equipment and materials in non-nautical settings.^[26] Wall-mounted davit cranes are fixed directly to building structures or walls, providing overhead lifting solutions in tight or confined areas where space is limited, such as workshops or assembly lines.^[26] They typically feature robust construction from materials like carbon steel to handle loads, with capacities reaching up to 1,000 kg depending on the model and configuration.^[26]^[27] Portable or gantry davit cranes utilize mobile bases, often made from lightweight aluminum for easy transport and setup, making them suitable for temporary applications in industrial maintenance tasks or wastewater treatment facilities.^[25]^[28] These systems support lifting operations such as removing pumps or stop logs from tanks, with load capacities generally up to 600 kg for goods handling.^[25]^[29] Jib-style davit cranes incorporate adjustable booms that allow for precise positioning of loads over variable distances and heights, frequently equipped with electric hoists to enhance efficiency and reduce manual effort.^[26]^[30] This design enables fine control in dynamic work environments, supporting capacities similar to other industrial variants while offering telescopic extensions operable even under load.^[30]^[31] In applications involving confined spaces, such as entry into tanks or elevated platforms, industrial davit cranes facilitate safe worker access, material handling, and emergency retrieval, ensuring compliance with OSHA standards under 29 CFR 1910.146, which mandates mechanical retrieval systems for permit-required confined spaces deeper than 5 feet to prevent engulfment hazards.^[32]^[33] These cranes often integrate fall protection features, meeting ANSI Z359 requirements for non-entry rescue operations in industrial settings.^[33]^[34]

Components

Structural Parts

The structural parts of a davit form its foundational framework, providing stability, support, and load-bearing capacity while withstanding environmental stresses such as corrosion and mechanical loads. These components are engineered for durability in maritime and industrial settings, with designs emphasizing secure anchoring and extension capabilities independent of dynamic operations.^[35] The base, or pedestal, serves as the anchored foundation of the davit, distributing loads to the supporting surface. In maritime applications, it is typically a steel-welded structure bolted or welded directly to the ship's deck to ensure rigidity against wave-induced forces. For industrial uses, bases may be mounted on concrete foundations using anchor bolts, allowing for fixed installations in facilities like docks or warehouses.^[36]^[37] The mast or post provides vertical support, rising from the base to elevate the davit system. Constructed as a tubular steel column, it typically varies in height from 1.5 to 5 meters, scaled to the required load capacity and clearance needs for the suspended item. This component absorbs compressive and lateral forces, maintaining alignment during use.^[35]^[38] The boom, or jib arm, extends horizontally or at an angle from the mast, enabling reach over edges or obstacles. It can be straight or curved, with lengths typically ranging from 2 to 6 meters, and is often adjustable using pins for positioning. This extension arm is pivoted at the mast connection to allow rotation, supporting the primary load path.^[39]^[35]^[40] Materials for davit structural parts prioritize corrosion resistance, particularly in marine environments exposed to saltwater. Galvanized steel is commonly used for its protective zinc coating, while aluminum alloys like 6061-T6 offer lightweight strength with inherent corrosion resistance. Stainless steel, such as grade 316, provides superior durability in highly corrosive conditions, and composites may be employed in industrial designs for reduced weight without sacrificing integrity.^[41]^[39]^[42] The cradle or falls consist of the load-holding elements, including blocks or attachments that secure the suspended object, such as a lifeboat. Cradles are typically constructed from high-tensile steel with adjustable features for fitting various sizes, often coated for environmental protection. Falls refer to the wire rope attachments, made from galvanized steel with fiber cores to prevent twisting and ensure secure suspension. Stainless steel fasteners enhance longevity in wet conditions.^[43]^[36]

Operational Mechanisms

Operational mechanisms in davits encompass the powered and manual systems responsible for raising, lowering, and positioning loads, typically attached to the structural boom for efficient load handling. These systems ensure controlled movement while adhering to safety standards for maritime and industrial applications. Key components include winches, hoists, hydraulic cylinders, wire ropes with sheaves, and control interfaces, each designed to handle varying load capacities and operational demands. Winches serve as primary devices for managing wire rope in davits, available in manual, electric, or hydraulic variants to facilitate controlled descent and ascent. Manual winches, often featuring hand-operated cranks and gear ratios such as 1:40 or higher, are suited for lighter loads up to 1,000 kg, providing mechanical advantage for precise, low-speed operations without external power. Electric winches, driven by motors with variable speeds up to 30 meters per minute, offer enhanced control for heavier loads and frequent use, incorporating electromagnetic brakes for secure holding. Hydraulic winches, utilizing fluid-powered drums, excel in high-torque scenarios for loads exceeding 2,000 kg, with gear reductions ensuring smooth, regulated lowering speeds to prevent overload. These winch types are integral to lifeboat and cargo davits, where gear ratios optimize torque for safe wire rope tension. Hoists in davit systems, particularly chain or electric models, enable precise lifting in industrial settings, with typical load limits ranging from 500 to 5,000 kg depending on configuration. Chain hoists use manual or powered chains with hooks for vertical positioning, offering fine control for loads around 1,000 kg in confined spaces like shipboard maintenance. Electric chain hoists, such as those with 0.25 to 3-ton capacities and lift speeds of 8-16 meters per minute, provide automated precision for repetitive tasks, featuring overload protection and compact designs for integration into davit arms. These hoists are commonly employed in non-maritime industrial davits for tasks requiring exact height adjustments, ensuring operator safety through limit switches and emergency stops. Hydraulic cylinders drive boom extension and tilting in contemporary davit designs, allowing dynamic positioning of loads over extended reaches. These cylinders, often double-acting for bidirectional force, operate at pressure ratings of 100-200 bar to extend booms up to 5 meters while supporting loads of 1,000-3,000 kg. In modern systems, they enable proportional control for smooth luffing, reducing manual effort and enhancing stability during offshore operations. Fluid reservoirs and valves maintain consistent pressure, with seals designed to withstand corrosive marine environments. Wire ropes, typically constructed from braided or stranded steel cables with diameters of 12-20 mm, work in tandem with sheaves to minimize friction and distribute load evenly across the davit. Sheaves, grooved pulleys with bearings, guide the ropes during movement, reducing wear by maintaining proper alignment and tension. Regular inspections focus on rope integrity, checking for broken wires, abrasion, or diameter reduction exceeding 10%, as well as sheave groove wear that could increase rope stress. These components undergo periodic non-destructive testing to ensure compliance with operational safety, with replacements mandated when wear exceeds 5% of original strength. Control systems for davits prioritize operator safety through intuitive interfaces, including hand cranks for manual models and remote pendants for powered variants. Hand cranks provide direct mechanical input for small-scale operations, allowing fine adjustments without electrical dependency. Remote pendants, wired or wireless units with push-button arrays, enable operation from a safe distance, typically up to 10 meters, incorporating dead-man switches to prevent unintended activation. These systems integrate with winches and hydraulics for synchronized control, reducing exposure to hazards like falling loads.

Operation and Release Systems

Launching Procedures

Launching procedures for davits, particularly in maritime contexts, follow a standardized sequence to ensure safe deployment of lifeboats or rescue craft. These steps are governed by the International Convention for the Safety of Life at Sea (SOLAS) and associated guidelines, as amended up to 2024, with further updates effective 2026 clarifying lowering speeds.^[44]^[45] Recent amendments to the LSA Code (MSC.554(108), effective 1 July 2026) further specify maximum lowering speeds and enhance safety protocols for davit operations.^[46] Preparation begins with the assigned crew donning life jackets and verifying communication systems, such as transceivers, are operational. Loads, including lifeboats, are secured using lashings and gripes, while pre-launch checks confirm davit alignment, wire tension, and the absence of tangles in falls or remote control wires. Boarding occurs via the embarkation deck, with crew ensuring the lifeboat's bottom plug is fitted, power supply activated, fuel valves opened, and seatbelts fastened before all members are seated.^[47]^[22] Swinging out involves pivoting the davit boom away from the ship's side to position the load over the water or target area, typically using winch controls for precise movement. The remote control wire is gently pulled to initiate this phase, ensuring the load remains stable as it clears the hull. This step relies on the davit's operational mechanisms, such as electric or hydraulic winches, to maintain balance during the swing.^[47]^[48] The lowering sequence commences once the boom is fully extended, with a controlled descent at a maximum speed of 1.3 m/s for fully loaded craft, with the minimum speed calculated as S = 0.4 + 0.02H m/s where H is the height of lowering in meters, as per LSA Code. Crew monitors for obstacles, and the helmsman signals for splashdown preparation, with centrifugal brakes on the falls regulating the rate to not exceed SOLAS limits.^[22]^[49]^[45] Recovery reverses the process by hoisting the load using the winch in reverse operation, ensuring even loading and lifting just clear of the water before swinging in. The davit arm is then secured at its stop position, and the load is manually stowed with lashings reapplied.^[47]^[48] Crew training through regular drills is integral to proficiency in these procedures, including muster stations, abandon ship simulations, and actual launching with operating crew aboard at least once every three months, as mandated by SOLAS Chapter III, Regulation 19. These exercises verify the ability to complete deployment within 10 minutes and familiarize personnel with davit systems.^[50]^[47]

Safety Release Features

Safety release features in davit systems for lifeboats are critical mechanisms designed to ensure controlled detachment during emergencies, preventing accidents such as premature or unintended drops. These features primarily focus on hooks and interlocks that allow release under specific conditions, balancing the need for rapid evacuation with safeguards against failure. On-load release hooks, also known as hydrostatic or mechanical hooks, enable disengagement while the lifeboat bears full weight, either through water pressure activation or manual operation, facilitating quick release just before or upon water contact.^[22]^[47] In contrast, off-load hooks provide simpler gravity-based releases intended for non-emergency scenarios, where the lifeboat is fully waterborne and the load is transferred to the water, allowing the hooks to disengage without bearing tension.^[22] Hydrostatic systems incorporate pressure-sensitive interlocks that activate when the lifeboat is waterborne, ensuring the hooks do not release prematurely while the boat is still suspended above the water surface. These systems integrate with the launching wires from the davit falls, using hydrostatic pistons to detect water pressure and trigger release only when the vessel is safely afloat.^[22] Fail-safe designs further enhance reliability through dual-wire fall configurations, where two independent suspension wires distribute the load and provide redundancy, and overload sensors that alert operators to excessive tension or trigger automatic safeguards.^[51] Such measures comply with SOLAS requirements, mandating hydrostatic interlocks unless alternative protections ensure waterborne status before release.^[47] Historical incidents, such as the Titanic disaster in 1912, highlighted issues with crew unfamiliarity in lifeboat deployment, leading to the development of advanced release capabilities in subsequent SOLAS amendments in the 1980s for hydrostatic and mechanical releases.^[44]^[51]

Applications

Shipboard Deployment

Shipboard davits are fundamental to maritime safety, primarily facilitating the launching of lifeboats that can accommodate 6 to 150 persons, ensuring compliance with SOLAS requirements for total ship evacuation capacity.^[52]^[53] These systems position lifeboats securely along the vessel's sides, allowing controlled descent via winches and falls, even when the ship lists up to 20 degrees or has a trim of 10 degrees.^[22] Gravity davits, a common type, rely on the boat's weight to swing outward and lower, minimizing reliance on electrical power during emergencies.^[22] In addition to primary lifeboats, davits support the quick deployment of rescue boats and tenders, typically rated for 5 to 15 persons, for urgent operations like man-overboard retrievals or short harbor transits.^[54]^[55] These smaller craft, often fast-rescue models, are launched from dedicated davit stations amidships or aft, enabling speeds up to 6 knots while carrying medical supplies and towing capabilities.^[22] On smaller vessels, compact davits also manage anchor chains or ropes, aiding precise deployment and recovery to prevent hull damage during anchoring.^[56] Davit installations form a core component of SOLAS life-saving arrangements under Chapter III, mandating their integration on cargo and passenger ships with provisions for on-load release hooks and periodic load testing up to 1.1 times the boat's weight.^[5]^[22] This ensures reliable performance in drills and real evacuations, with systems inspected annually by authorized service providers.^[48] A notable example appears on modern cruise liners such as the Viking Vela, where multiple telescopic davit sets handle both lifeboats and tenders, supporting rapid embarkation for thousands of passengers while adhering to SOLAS standards.^[57]^[53] These configurations, often energy-stored for gravity-assisted launches, enhance evacuation efficiency on large vessels exceeding 100,000 gross tons.^[57]

Industrial and Specialized Uses

In industrial settings, davits are adapted as compact, portable cranes featuring a vertical mast and horizontal boom to facilitate lifting and positioning in areas where larger equipment cannot operate effectively. These systems, often rated for capacities up to 1,000 pounds or more, incorporate winches and fall arrest mechanisms to ensure safe operations in non-maritime environments.^[58] Davit systems play a critical role in confined space entry operations, where they enable the safe lowering and retrieval of workers or gear into restricted areas such as storage tanks, sewers, manholes, and silos. Equipped with anti-sway features like adjustable booms and self-locking winches, these davits minimize load oscillation during vertical movement, reducing the risk of injury in hazardous, enclosed spaces. For instance, OSHA-compliant models from manufacturers like 3M DBI-SALA provide integrated hoist systems capable of supporting up to 350 pounds for rescue-rated applications, allowing for non-entry retrieval in emergencies.^[34]^[59]^[33] In wastewater treatment and utility plants, davits are commonly used for deploying and maintaining pumps, sensors, and other submerged equipment in wet wells, clarifiers, and treatment basins. Portable models, often constructed from corrosion-resistant materials like galvanized steel or composites, allow single operators to lift loads exceeding 500 pounds without heavy machinery, facilitating routine maintenance and reducing downtime. Examples include composite davit cranes designed specifically for sewage pump handling, which can be disassembled and relocated easily across plant sites.^[60]^[28]^[61] On construction sites, temporary davit cranes serve as versatile tools for material handling on bridges, elevated platforms, and scaffolding where space is limited. These portable units, with adjustable outreach up to 6 feet (1.8 m), support the lifting of tools, formwork, or small components, often mounted on wall or floor bases for quick setup and removal. Their lightweight design, typically under 100 pounds, makes them ideal for dynamic job sites, enhancing efficiency in tasks like bridge deck repairs or platform assembly.^[62]^[63]^[64] For offshore platforms, hybrid davit cranes are engineered for supply transfer operations, enduring harsh weather conditions with features like motion compensation and IP66-rated enclosures for saltwater resistance. These systems, often electric or hydraulic, handle cargo such as spare parts and tools between vessels and platforms, with safe working loads up to 2,000 kilograms and slewing capabilities of 270 degrees or more. In offshore wind farms, they facilitate efficient logistics by lowering loads directly onto work decks, minimizing vessel downtime.^[65]^[66]^[67] Specialized davit variants include rescue-rated models for fire services, which support emergency extractions in industrial or urban settings by integrating self-retracting lifelines for rapid deployment. Additionally, davit systems for high-rise window washing suspend platforms or bosun's chairs from building roofs or parapets, using counterweighted arms to reach facades up to 50 stories, ensuring stable access for maintenance crews while complying with ANSI standards for fall protection.^[33]^[68]

Regulations and Standards

International Maritime Rules

The International Convention for the Safety of Life at Sea (SOLAS), particularly Chapter III on life-saving appliances and arrangements, establishes mandatory global standards for davits as launching appliances to ensure reliable deployment of survival craft during emergencies.^[50] These regulations require davits to be designed and constructed to handle fully loaded lifeboats or rescue boats, including the full complement of persons and equipment, with a focus on rapid and safe operation to facilitate evacuation.^[69] Specifically, SOLAS Regulation 19 mandates that launching appliances enable the survival craft to be boarded and launched efficiently, with the overall process for lifeboats designed to allow deployment within 5 minutes from the embarkation order in moderate sea conditions.^[52] Load testing requirements under SOLAS Chapter III, Regulation 20, ensure davit structural integrity by mandating proof load tests at 1.1 times the maximum working load, accounting for dynamic factors such as vessel motion in various sea states.^[70] These tests include static proof loading and dynamic lowering at maximum speed over at least 3 meters, conducted every five years or as part of approval surveys, to verify the davit's capacity to support the survival craft without failure.^[71] The 1.1 factor incorporates safety margins for operational stresses, including wave-induced accelerations, ensuring reliability in up to Beaufort Force 6 conditions.^[72] SOLAS and the associated LSA Code specify that davit-launched lifeboats must be capable of withstanding a drop into the water from a height of at least 3 meters during testing to verify hull and seating integrity and simulate accidental release or failure scenarios.^[73] This requirement applies to conventional davit-launched craft; freefall lifeboats, which use a separate ramp for launching, are certified for higher drops up to their approved stowed height but must also meet impact tolerance standards without structural damage or injury risk.^[74] Type approval for davits is overseen by the International Maritime Organization (IMO), with certification granted by recognized classification societies such as DNV or ABS, confirming compliance with SOLAS and LSA Code through design review, prototype testing, and production oversight.^[75] These bodies conduct conformity assessments, including overload simulations and operational trials, to issue certificates valid for installation on flagged vessels.^[76] Amendments to SOLAS entering into force on 1 January 2026 introduce enhanced requirements for lifting appliances under new Regulation II-1/3-13, applicable to davits and similar systems not already covered by LSA Code specifics, including mandatory design standards, post-installation load testing at 1.1 times safe working load, and provisions for overload prevention through structural safeguards and marking.^[77] These updates require thorough examinations at renewal surveys and documentary evidence of compliance, aiming to standardize safety across all onboard cranes and winches while integrating with existing life-saving appliance rules.^[78]

Maintenance and Compliance

Maintenance and compliance protocols for davits ensure operational reliability and adherence to international and industrial standards, focusing on regular inspections, servicing, and documentation to prevent failures during emergencies.^[5] These measures align with SOLAS design baselines outlined in international maritime rules, emphasizing post-installation upkeep.^[79] Annual thorough examinations of maritime davits, as detailed in IMO Res. MSC.402(96) under SOLAS Chapter III, involve comprehensive visual inspections for corrosion, misalignment, deformation in the davit structure, and kinks or corrosion in wire ropes, conducted by certified personnel from the manufacturer or an authorized service provider.^[5] Wire ropes are additionally checked for wear, with replacement mandated every five years or sooner if defects are detected, to maintain load-bearing integrity.^[80] Load tests during these examinations require lowering an empty lifeboat or equivalent load to maximum speed, abruptly applying the brake, and reinspecting stressed components, alongside lubrication of wires, sheaves, and moving parts.^[81] Five-year overhauls extend these protocols with disassembly of winches and hooks by original equipment manufacturer (OEM) technicians or authorized providers, examining tolerances, adjusting release gear, and performing overload operational tests using 1.1 times the lifeboat's weight (including full complement and equipment).^[5] This includes operational testing of hooks and release mechanisms under load, both partially and fully waterborne, followed by recovery and damage assessment to verify structural integrity.^[81] Post-overhaul, vital parts are inspected for cracks or defects, ensuring compliance with SOLAS-mandated service intervals.^[82] Record-keeping is essential for davit maintenance, requiring logs of all drills, repairs, inspections, and certifications to be maintained onboard and updated for flag state audits, as stipulated in SOLAS guidelines.^[83] These records must detail inspection dates, personnel signatures, test results, and any servicing actions, facilitating verification during regulatory reviews.^[84] Non-compliance with davit maintenance standards poses significant risks, including fines or vessel detentions during port state control inspections; for instance, a 2020 case in the Tokyo MOU region resulted in detention due to a defective rescue boat davit storage power system.^[85] Such deficiencies often stem from inadequate servicing, leading to operational failures that compromise safety.^[86] In industrial applications, davits functioning as cranes may fall under OSHA standards such as 1910.179 for overhead and gantry types or 1910.146 for confined space retrieval systems, which mandate daily operator inspections for structural integrity, wire ropes, and safety devices, alongside monthly thorough examinations of ropes and certification records.^[87] Annual periodic inspections cover all critical components, with documentation ensuring traceability and hazard prevention in non-maritime settings.^[88]

References

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DAVIT. A type of jib crane traditionally associated with raising and lowering a boat out of and into the water. It is also traditionally in the form of a ...
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Davit. A crane on the side or stern of a ship for raising or lowering loads, often arranged in pairs for lowering lifeboats. Derrick.
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Word History and Origins. Origin of davit. 1325–75; Middle English daviot ... Origin of davit. C14: from Anglo-French daviot, diminutive of Davi David.
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Basically, a set of davits is nothing more than a special crane that is designed specifically for handling boats in a safe and timely manner. BOAT BOOMS. Ships ...
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SOLAS Life Boat Gravity Telescopic Type Davit
Telescopic type davit is used for large lifeboat normally, it luffs arms by hydraulic system, and lowers boat by the help of its own weight as well as recovers ...Missing: radial freefall
[23]
What is maximum the carrying capacity of the lifeboat as per SOLAS?
No lifeboat shall be approved to carry more than 150 person (LSA CODE, CHAPTER 3, REG 4.4.2). AND. According to LSA Code, Chapter 3, Reg. 4.4.1.2 ...
[24]
T Davit Lightweight Portable Lifting Solutions - REID Lifting Inc
The TDAVIT Double Winched davit crane has been designed for fall protection applications, including confined space entry and has been tested to and is fully ...
[25]
The Ultimate Guide to Davit Cranes - Thern
Aug 13, 2025 · These cranes offer a higher load capacity than their portable counterparts and are often made of heavy-duty materials like carbon steel.
[26]
https://thern.com/blog/the-ultimate-guide-to-davit-cranes/
[27]
https://www.hoistsdirect.com/sites/default/files/product-pdfs/2015/04/Thern-DAVIT.pdf
[28]
Columbia Portable Davit Cranes Assist Waste Water Treatment Plant
Portable davit cranes located at the screen structure to lift and lower stop logs and dewatering pumps. Their application required 400 pounds of lift.
[29]
Davit Cranes | OZ Lifting Products
Experience unmatched versatility with the Tele-Pro® Davit Crane, featuring a revolutionary telescoping boom adjustment that operates seamlessly even under load.Missing: style | Show results with:style<|separator|>
[30]
Davit Crane vs. Jib Crane: A Differences Breakdown - Thern
Jun 26, 2025 · Davit cranes have a flexible design and are more portable, while jib cranes have a horizontal boom and are designed for specific jobs. Davit ...
[31]
https://thern.com/blog/davit-crane-vs-jib-crane-a-breakdown/
[32]
Rescue-Rated Davit Cranes: Ensuring Worker Safety - Thern
Jun 3, 2024 · Our cranes are pre-configured to meet the stringent standards of ANSI/OSHA and ANSI Z359. ... confined spaces. A Solution Tailored to Your Needs: ...
[33]
Davit Arm Systems Guide | Confined Space Protection - Pelsue
Mar 7, 2022 · Resources: OSHA requirements for davit in different situations can be found here. Considerations when choosing the right davit arm system ...
[34]
The Ultimate Guide to Davit Cranes - Lifting365
Feb 23, 2024 · These cranes are primarily used to lift and lower heavy objects that cannot be moved manually. They provide a versatile and flexible solution ...
[35]
Structure of Single Arm Davit
Jun 1, 2021 · Single-arm davit main components: davit arm, pedestal, slewing bearing, slewing tray, hydraulic slewing unit, hoisting mechanism, guide tackle, boat fall and ...
[36]
3M DBI-SALA Advanced 8516190 Confined Space System, Floor ...
Floor mount sleeve davit base, zinc plated, for advanced offset davit mast. Mounts to horizontal concrete or steel structures providing anchor point base ...
[37]
[PDF] technical sheet davit systems davit masts - Tractel
All standard masts have a rated capacity of 1150 lbs. or. 525kg. options: Davit lifting bracket, manual lifting hoist, davit turning handle. materials:.Missing: dimensions maritime industrial
[38]
Marine Davit Crane-MOTCRANE
Marine Davit Crane are specifically engineered for the handling of vertical or angled loads in confined or difficult-to-access spaces.
[39]
Marine Davit Cranes | Patterson Manufacturing
Patterson Davit Cranes are 100% hot-dipped galvanized and use stainless steel hardware to last for decades in corrosive environments.
[40]
6061 T6 Aluminum: The Perfect Alloy for Marine and Aerospace ...
Sep 3, 2024 · 6061 T6 Aluminum is a high-strength alloy that combines exceptional corrosion resistance, toughness, and machinability.Missing: maritime | Show results with:maritime
[41]
DDP-Series Davit - Allied Systems
The DDP-Series davit features dual constant-tension winches, self-leveling falls, dual point pivoting booms, quick release hooks, and an integrated boat cradle.
[42]
[PDF] MSC.1-CIRC.1205-Rev.1
Jun 26, 2019 · Go up to the platform of the davit system (platform for boarding the lifeboat). 1 Wind the boat fall manually to take off the slack. Pull out ...
[43]
Complete Guide To Solas Lifeboat Launching Requirements
Aug 20, 2024 · Launching Time: SOLAS requires that lifeboats must be capable of being launched within a short timeframe (typically 10 minutes) after the ...
[44]
SOLAS Lifeboat Requirements - MarineSite.Info
>The wires which lift or lower the lifeboat are known as falls and the speed of the lifeboat descent should not be more then 36m/ min which is controlled by ...
[45]
Summary of SOLAS chapter III - International Maritime Organization
Regulation 18 Line-throwing appliances. Regulation 19 Emergency training and drills. Regulation 20 Operational readiness, maintenance and inspections. Section ...
[46]
'On-load' Release Hooks for Davit Launched Lifeboats: “USE WITH ...
The 'on-load' hook was designed to allow the lifeboat crew to release both davit hooks simultaneously before the boat was fully waterborne in either calm or ...
[47]
[PDF] Surviving disaster – The Titanic and SOLAS
The crew of the Titanic lacked training in loading and lowering the lifeboats and few knew which boat they were assigned to. Lifeboats were not filled to ...
[48]
Complete Guide to SOLAS Lifeboat Requirements in 2025
Jul 21, 2025 · Sufficient capacity for 100% of persons on board, with lifeboats on each side of the vessel ... Capacity: Up to 150 persons. Protection ...Solas Lifeboat Requirements... · Solas Lifeboat Types · Solas Amendments About...
[49]
Maritime | Conventional lifeboat and davits - Viking Life
Our lifeboat davits are available in a wide range of safe working loads, lowering heights and weights. VIKING Norsafe davits are produced in house and ...
[50]
Regulation 23 - Rescue boats
(ii) be capable of carrying at least five seated persons and a person lying down or in the case of a rescue boat less than 3.8 m in length, such lesser number ...
[51]
Free-fall Lifeboats | PALFINGER MARINE
Complies with SOLAS regulations · Free-fall height between 16-30 m · Capacity from 15-50 people · Available in two versions: tanker and dry cargo · Equipment built ...
[52]
Text-Book of Seamanship - Part 5
TO WEIGH THE STREAM ANCHOR BY THE LAUNCH. Ship the davit or roller in the stern, pass in the boat a. couple of good luffs, straps, spun-yarn, and stuff for ...
[53]
Davit deliveries for new cruise ships - Riviera Maritime Media
Mar 6, 2025 · On Viking Vela, Navim Group designed, engineered and successfully delivered the telescopic energy stored power davits for cruise tender, ...
[54]
https://www.imorules.com/GUID-CFD93744-4BAA-4C9A-92F2-D223E93A9577.html
[55]
3M™ DBI-SALA® Confined Space 5-Piece Davit Hoist System ...
3M™ DBI-SALA® Confined Space 5-Piece Davit Hoist System is the industry gold standard for manhole and confined space entry and retrieval applications.
[56]
The Crane That's Changing Wastewater Operations
Sep 4, 2025 · These ultra-lightweight, corrosion-resistant cranes are easy to disassemble, move, and reassemble, by a single operator – no tools needed. With ...
[57]
Davit Cranes | Mark Walpole & Assoc - Infrastructure Recovery
Graphite davit cranes from OZ Lifting Products up to 1200 pound capacity. . Davit Cranes. For Use in the Wastewater Treatment Plants.Missing: utility | Show results with:utility
[58]
Portable Davit Cranes | Thern®
Thern has portable davit cranes suited for a wide range of applications. Learn more about our cranes and custom engineering options.Missing: temporary platforms
[59]
Davit Crane: Roof and Wall Mount Systems - EDGE Fall Protection
A davit crane system is comprised of a modular arm and base plate or pedestal. The davit arm mounts in a connector socket secured to the base. The base plate ...Roof Davit Crane · Edge Davit Crane Options · Davit Crane Roofmount Ibeam<|control11|><|separator|>
[60]
https://www.ozliftingproducts.com/the-crane-thats-changing-wastewater-operations/
[61]
Davit cranes - MELCAL
Our fully electric davit cranes are designed to transfer spare parts and materials between offshore wind platforms and supply vessels. MELCAL davits can also ...
[62]
Reliable Davit Cranes for Offshore Wind Applications - Nante Crane
Davit cranes are helpful lifting tools used in ocean spots like offshore wind farms, oil platforms, and ships. They have a firm base, a turning arm, a winch, ...Missing: transfer | Show results with:transfer
[63]
Seasight Davits revolutionizes the personnel-transfer method in ...
Davit cranes play an important role in on offshore wind farm as they transfer cargo such as tools and spare parts from the vessel to the wind turbine and back.Missing: supply | Show results with:supply
[64]
Window Washing Davits | Suspended Access Systems - Pro-Bel
Window washing davit systems are crane-like systems that suspend powered platforms, single cages, or bosun's chairs so that window washers or other façade ...
[65]
[PDF] SOLAS CHAPTER III LIFE-SAVING APPLIANCES AND ...
winch brake at maximum lowering speed. The load to be applied shall be the mass of the lifeboat without persons on board, except that, at intervals not ...
[66]
[PDF] MSC.1-Circ.1632-Rev.1 - dco.uscg.mil
Jan 22, 2025 · A test load of 1.1 times the maximum working load should then be lowered at maximum lowering speed through a distance of at least 3 m and ...
[67]
[PDF] RESOLUTION A.689(17) adopted on 6 November 1991 TESTING ...
Nov 6, 1991 · A test load of 1.1 times the maximum working load should then be lowered at maximum lowering speed through a distance of at least 3 m and ...
[68]
[PDF] Technical Information - ClassNK
Oct 17, 2006 · 3.2 The five-year operational test should be done by lowering the boat loaded to a proof load equal to 1.1 times the weight of the survival ...
[69]
Lifeboat requirements as per LSA Code - Marine Teacher
Jul 16, 2021 · not less than 1.3 m for a lifeboat permitted to accommodate nine persons or less;. not less than 1.7 m for a lifeboat permitted to accommodate ...
[70]
2025 SOLAS & LSA Code Lifeboat Requirements: Compliance Guide
Dynamic brake testing at maximum lowering speed ensures emergency stopping capability. Five-Year Overhaul Cycles. Release mechanism overhaul requires ...
[71]
ABS Type Approval Certification for Marine and Offshore Facilities
ABS Type Approval streamlines the acceptance of equipment and components on ABS-classed units and other marine and offshore applications.Missing: IMO davits
[72]
Launching Appliance of Free Fall Lifeboat davit With DNV Class ...
Rating 5.0 (53) Launching Appliance of Free Fall Lifeboat davit With DNV Class Approval Certificate offered by China manufacturer China Deyuan Marine .
[73]
New safety requirements for onboard lifting appliances from 1 ... - DNV
Aug 26, 2025 · Any lifting appliances installed on or after 1 January 2026 will require compliance with the new rules and may trigger implementation of the IMO ...
[74]
[PDF] resolution msc.532(107) - International Maritime Organization
Jun 8, 2023 · 2.3. Lifting appliances installed on or after 1 January 2026 shall be permanently marked and provided with documentary evidence for the safe ...<|control11|><|separator|>
[75]
https://ww2.eagle.org/en/Products-and-Services/vendor-certification/type-approval.html
[76]
[PDF] Maintenance and renewal of wire falls used ... - Technical Information
Dec 16, 2004 · The renewal of falls at the required intervals of four or five years (according to the maintenance procedure adopted) must be included.
[77]
[PDF] Circular No. 21 / 2019 - ClassNK
Jan 1, 2020 · 11.4. Lifeboats and rescue boats, including fast rescue boats, shall be subject to a thorough examination and operational test during the annual ...
[78]
[PDF] Annex – 3 Maintenance Requirements of Life Saving Appliances
Bent stanchions should be replaced or repaired and guard ropes should be inspected for wear and renewed where necessary. 2. Moving parts should be free to turn ...
[79]
[PDF] IMO Ref. T4/3.01 MSC.1/Circ.1206/Rev.1 11 June 2009 MEASURES ...
Jun 11, 2009 · 14. Records of inspections, servicing, repairs and maintenance should be updated and filed on board the ship. 15. When repairs, thorough ...
[80]
[PDF] comdtpub 16700.4 nvic 03-19 - dco.uscg.mil
Nov 20, 2019 · 2. Records of inspections and routine on-board maintenance carried out by the ship's crew and the applicable certificates for the equipment ...
[81]
[PDF] Summary of the Detention Case 36-02-2020 - Tokyo MOU
Detainable deficiency No.1: Rescue Boat Davit Storage Power Defective. 1. The port State advises that during the inspection, the rescue boat davit was tested.
[82]
Top 10 Port State Control (PSC) Deficiencies - Virtue Marine
May 7, 2025 · This article examines the top 10 PSC findings on ships and provides practical guidance on addressing these issues proactively.
[83]
https://www.register-iri.com/wp-content/uploads/MSC.1-Circ.1206-Rev.1.pdf
[84]
29 CFR 1910.179 -- Overhead and gantry cranes. - eCFR
A thorough inspection of all ropes shall be made at least once a month and a certification record which includes the date of inspection, the signature of the ...