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Coaming

A coaming is a raised vertical structure, typically constructed from steel plating, that surrounds openings such as hatchways on a ship's deck to prevent water from entering cargo holds or compartments while also compensating for the structural weakness introduced by the opening.^[1]^[2] In maritime engineering, coamings play a vital role in ensuring vessel safety and cargo integrity by forming a watertight barrier against green water loads during heavy weather and serving as a framework for securing hatch covers.^[3]^[1] Their design incorporates reinforcements like gusset plates, longitudinal girders, and stiffeners such as bulb flats or cope bars to maintain deck strength, with minimum heights specified under international regulations—at least 600 mm at exposed forward positions and 450 mm at after positions—to comply with the Load Line Convention.^[2] Coamings are integral to bulk carriers, container ships, and other cargo vessels, where they protect against corrosion and water damage that could lead to significant financial losses, as evidenced by rising insurance claims from hatch-related incidents over decades.^[3]^[2] The concept of coamings dates back to at least 1611, with etymological roots possibly linked to the word "comb," and they have been a fundamental element of ship construction since early wooden vessel designs to manage water flow around deck openings like scuttles and companionways.^[4] In modern applications, coamings extend beyond hatches to include fore-and-aft framing, with athwartship elements known as head ledges, and may feature sloping profiles or drain systems with non-return valves to enhance functionality on contemporary steel-hulled ships.^[5]^[6]

Overview

Definition

A coaming is a raised vertical frame or border surrounding openings in a ship's deck, such as hatchways, designed to prevent water from entering below deck while also compensating for structural weakness caused by the opening.^[4]^[1] In nautical engineering, it functions as a protrusion that deflects seawater, rain, or waves away from the aperture, thereby maintaining the vessel's watertightness and providing reinforcement to the deck plating.^[2] The term "coaming" first appeared in English during the early 17th century, with recorded nautical usage dating to the 1610s, specifically referring to a raised edge on hatches to block water ingress in sailing vessels.^[7] Its etymology remains uncertain and of unknown origin, though it may derive irregularly from the word "comb," evoking a crest-like ridge; the term has since been adopted in aviation to denote the rim or edge around a cockpit enclosure.^[4] Core components of a coaming typically include vertical steel plating or wooden borders that are welded or fastened securely to the deck, forming a continuous rim around the opening for enhanced durability and sealing.^[2] This assembly often incorporates stiffeners, such as angle irons or bulb flats along the upper edge, and stays extending to the deck for additional support.^[8]

Purpose

Coamings serve as essential raised structures surrounding deck openings on ships, acting primarily as barriers to prevent water ingress from sources such as rain, waves, or deck washing into below-deck compartments like cargo holds.^[1] This function is critical for maintaining the vessel's watertightness, ensuring that external moisture does not compromise the integrity of stored goods or internal systems during voyages.^[3] By forming a vertical protrusion around hatchways and similar openings, coamings direct accumulated water away from entry points, channeling it through dedicated drain channels and pipes, often equipped with non-return valves, for efficient drainage from the coaming area and reducing the risk of water accumulation around the opening.^[9] In addition to water exclusion, coamings fulfill secondary structural roles by compensating for the loss of deck strength resulting from the creation of large openings for cargo access or equipment installation.^[1] They provide a framework that supports hatch covers, facilitating even load distribution across the deck and enhancing overall vessel resilience against environmental stresses.^[2] This reinforcement helps preserve the ship's longitudinal and transverse girder continuity, preventing localized weaknesses that could propagate under operational loads.^[10] For instance, in rough seas where green water may cascade across the deck, coamings effectively mitigate flooding risks that could otherwise lead to stability disruptions or cargo contamination, thereby safeguarding both crew safety and operational continuity.^[9] Such protective measures are particularly vital for bulk carriers and container vessels, where unprotected openings could result in significant economic losses from damaged shipments.^[3]

Historical Development

Origins in Shipbuilding

Coamings originated as simple raised wooden borders around hatches in wooden sailing ships of the 16th to 18th centuries, designed primarily to combat water ingress during storms and heavy seas. These structures helped direct water away from openings, preventing it from cascading into cargo holds or the bilge, which was a common hazard in open-deck vessels reliant on sails. The term "coaming" first appeared in English nautical records around 1610, denoting the elevated framing that formed a barrier against deck runoff.^[7] This feature evolved from rudimentary edgeboards or raised ledges used in earlier medieval vessels, where basic timber elevations around deck openings provided initial protection against swamping in smaller clinker-built ships. By the 17th century, coamings were more formally integrated into ship designs and documented in building records for their role in averting bilge flooding, as evidenced in contracts specifying their placement to enhance watertightness amid rough conditions. For example, the 1695 construction contract for the British third-rate warship HMS Yarmouth detailed oak hatch coamings to reinforce deck openings and maintain structural stability.^[11] During the Age of Sail, coamings were standardized in naval architecture for larger vessels, becoming integral to the designs of British and Dutch East Indiamen that dominated global trade routes. These ships incorporated robust coamings to withstand prolonged exposure to ocean swells, with British examples drawing from established practices in warship construction. William Sutherland's 1711 treatise Ship-Builder's Assistant describes coamings as heavy "long carling" elements in the deck framing of a circa 1700–1710 vessel, underscoring their evolution from ad hoc borders to essential components for safety and load-bearing in merchant fleets.^[11]

Evolution with Modern Materials

The transition to iron-hulled ships in the 19th century marked a significant evolution in coaming design, as traditional wooden structures began incorporating iron reinforcements to align with the new hull materials. During this period, shipbuilders addressed the limitations of all-wooden vessels by adding iron strips and brackets to hatch coamings, which protected against wear and enhanced overall structural integrity while mitigating issues like rot in wooden components.^[12] This shift, driven by the industrial revolution's emphasis on iron for larger, more robust vessels, improved durability in marine environments, though early iron elements required protective measures against corrosion, such as rudimentary coatings.^[13] By the mid-19th century, these hybrid designs became common in merchant and naval fleets, laying the groundwork for fully metallic coamings.^[14] In the 20th century, coamings advanced toward standardization with the widespread adoption of steel, particularly following the 1929 patent of steel hatch covers by the MacGregor brothers, which integrated seamlessly with steel coamings to form a unified, weatherproof system.^[2] These designs replaced older wooden or pontoon covers, providing superior strength and watertightness for general cargo ships.^[15] During World War II, this technology was prominently featured in mass-produced cargo vessels like the Liberty ships, which utilized 3-foot-high steel coamings around their upper deck hatches to enhance compartmentalization and prevent water ingress during rough seas.^[16] The all-steel construction of these ships, including coamings, contributed to their role as vital supply lines, with the raised profiles effectively deflecting waves and maintaining cargo integrity under wartime conditions.^[16] Post-World War II developments further refined coaming integration by pairing them with powered hatch mechanisms, such as hydraulic folding and rolling systems pioneered by MacGregor and similar innovators.^[17] These advancements, emerging in the late 1940s and 1950s, automated the opening and closing of hatch covers atop steel coamings, significantly reducing manual labor requirements for crews while preserving the coamings' primary function of water deflection and structural support.^[2] By the 1960s, such powered systems became standard on bulk carriers and container ships, enabling faster cargo handling without compromising the watertight seals formed by the coamings.^[17]

Design and Construction

Materials Used

Coamings in modern shipbuilding are primarily constructed from mild steel or high-tensile steel grades that conform to hull structural standards, such as ASTM A131 Grade A for ordinary strength applications with a minimum yield strength of 235 MPa, or higher-strength variants like AH36 with 355 MPa yield strength.^[18]^[19] These materials are selected for their excellent weldability, which facilitates integration with the ship's deck structure, and their high tensile strength to endure structural loads and environmental stresses without deformation.^[20]^[21] For areas exposed to severe corrosion, such as those in position 1 on exposed decks, corrosion-resistant alternatives like stainless steel alloys (e.g., grade 316) are employed to enhance durability in harsh marine environments.^[22]^[23] Historically, in wooden vessels prior to the widespread adoption of steel in the late 19th century, coamings were made from durable hardwoods like oak, often treated with preservatives such as tar or linseed oil to protect against rot and moisture ingress.^[24] Key material properties include the ability to withstand tensile stresses ranging from 235 to 355 MPa, depending on the steel grade and ship classification society requirements, ensuring coamings maintain integrity under wave impact and cargo hold pressures.^[22] To combat saltwater corrosion, these steels are typically protected with epoxy-based coatings, such as high-build systems designed for impact resistance in bulk carriers, providing a barrier against electrolytic degradation and extending service life.^[25]^[26] Selection criteria prioritize environmental exposure, with mild steels suiting sheltered areas and upgraded alloys or coatings mandated for open-sea operations to meet international standards like those from IACS UR S21.^[27]

Structural Dimensions and Standards

Coamings on weather decks must adhere to minimum height requirements to ensure watertight integrity and prevent water ingress during heavy seas. According to the International Convention on Load Lines 1966, Regulation 14, the height of hatchway coamings above the deck shall be at least 600 mm (or 450 mm for hatchways on trunks complying with Regulation 36). For exposed hatchways on decks above the superstructure deck, coamings and covers shall comply with requirements set by the Administration.^[28] These dimensions provide structural elevation to accommodate sealing arrangements and resist wave action. The thickness of coaming plating is determined based on the underlying deck plating thickness, typically ranging from 10 to 20 mm for steel constructions to match load-bearing capacities. Scantling evaluations under the International Association of Classification Societies (IACS) Unified Requirement (UR) S21 specify formulas for net minimum thickness, such as t = 0.0142 s \sqrt{\frac{P_A}{0.95 R_{eH}}} mm for Type-1 ships, with a minimum of 6 + \frac{L_1}{100} mm, ensuring the coaming withstands applied pressures without excessive deformation.^[29] Load models for coaming design incorporate sea pressures to assess structural adequacy. The horizontal pressure P_A (kN/m²) is calculated as P_A = f_n f_c (f_b C_w - z), as defined in IACS UR S21 for general scantling evaluation, where f_n, f_c, f_b are correction factors, C_w is the wave coefficient, and z is the vertical distance from the summer load waterline; for Type-2 ships, pressures P_{coam} are determined per UR S21.2.2.2, typically up to 27 kN/m² in exposed forward areas.^[29] Vertical and horizontal stiffeners are required on coamings to prevent buckling under these wave-induced loads, which can reach up to 20 kN/m², with vertical stiffener section modulus Z = \frac{P_A s l^2 f_{bc}}{R_{eH}} cm³ and buckling checks per UR S35.^[29]

Types and Applications

Hatch Coamings

Hatch coamings are raised vertical structures surrounding cargo hatch openings on ships, specifically engineered to interface with hatch covers for secure closure and structural support in marine environments. In cargo shipping, these coamings form the foundational frame that elevates the hatch edge above the deck, directing water away while accommodating the weight and movement of covers. Their design ensures compatibility with various hatch cover types, such as pontoon-style for container vessels or folding mechanisms for bulk carriers, facilitating efficient cargo access below deck.^[2] A key feature of hatch coaming design is their extension in the fore-aft direction beyond the hatch opening edges, typically integrating with deck beams or girders to maintain structural continuity and enhance load distribution. This extension, often achieved through taper brackets, helps reduce stress concentrations at the hatch ends and supports the overall integrity of the deck plating. Additionally, coamings incorporate landing pads, also known as bearing pads, positioned along the top edge to provide stable support for hatch covers. These pads enable steel-to-steel contact, complemented by compressible gaskets made of soft elastic materials, to achieve watertight seals that prevent ingress of seawater or moisture during voyages. The pads transfer the cover's weight and any superimposed loads directly to the ship's hull structure, with typical operational clearances of 10-15 mm to allow for relative movements.^[2]^[20]^[30] In bulk carriers, hatch coamings play a vital role in protecting moisture-sensitive cargoes like grain or ore by maintaining weathertight integrity through effective sealing and drainage channels equipped with non-return valves. These features minimize the risk of cargo sweat or external water entry, which could lead to spoilage or structural weakening of the load. For container ships, coamings are adapted to bear substantial stacking loads from above-deck containers, with bearing pads and stiffeners designed to handle forces from multiple stacked units; for instance, individual containers can impose up to 30 tons of weight, necessitating robust transmission to the hull to avoid deformation under dynamic sea conditions.^[22]^[3]^[31] Variations in hatch coaming configurations depend on hatch size and ship type, with continuous coamings favored for large openings to ensure uninterrupted stiffening across the breadth and length, promoting uniform load bearing and sealing. In contrast, sectional coamings, featuring sniped or interrupted stiffeners, are employed for smaller access points where practicality limits full continuity, though they require enhanced scantlings at joints to compensate for potential weaknesses. This adaptability allows coamings to suit diverse operational needs while adhering to structural standards for safety and efficiency.^[22]^[20]

Other Nautical and Non-Nautical Coamings

In nautical contexts beyond hatch covers, companionway coamings serve as raised borders surrounding access points for ladders or stairs leading below deck on yachts and smaller vessels, designed to prevent water ingress while facilitating crew movement. These coamings typically feature a minimum height of 300 mm above the deck to comply with offshore sailing standards, ensuring watertight integrity during rough seas, and often incorporate a double-layered design with an intermediate channel for draining any incidental leakage.^[32] For larger commercial yachts, heights may extend to 600 mm in exposed positions to meet load line conventions, with integrated slots or grooves promoting efficient water runoff.^[33] Beyond maritime applications, coamings adapt to aviation in the form of low-profile rims bordering open cockpits in biplanes and early aircraft designs, providing a padded edge for pilot support and wind deflection without enclosing the space. In classic biplanes like the Hatz or Bowers Fly Baby, these coamings—typically formed from tubular metal or composite materials wrapped in leather or foam—rise just a few inches above the cockpit sill to accommodate headrest padding while allowing unobstructed visibility for open-air flight.^[34]^[35] In architectural settings, coamings manifest as roof curbs: elevated frames surrounding hatches or penetrations on flat or low-slope roofs, engineered to channel water away from seams and prevent leaks into building interiors. These curbs, usually 150-300 mm high and fabricated from galvanized steel or aluminum, integrate with roofing membranes via sealant application and flashing to create a watertight barrier, essential for equipment like HVAC units or skylights.^[36]^[37] Specific examples illustrate coamings' versatility in recreational and specialized uses. In kayaking, cockpit coamings form the contoured rim around the paddler's opening, typically oval or keyhole-shaped with a lip 20-50 mm wide, enabling secure attachment of neoprene spray skirts that seal against waves during touring or whitewater paddling.^[38]^[39]

Maintenance and Regulations

Inspection and Maintenance Practices

Inspection of hatch coamings begins with routine visual examinations conducted by ship crews to identify cracks, corrosion, and deformations on the structure's surfaces and edges.^[40] These checks are supplemented by non-destructive testing methods, such as ultrasonic thickness gauging, to assess material loss and ensure the plating retains sufficient integrity against ongoing wear.^[41] Classification societies mandate annual surveys that include detailed scrutiny of coamings, often incorporating hose testing to verify weathertightness by simulating water exposure from a distance of 1 to 1.5 meters.^[42]^[40] Common issues affecting coamings include corrosion accelerated by saltwater exposure, especially in areas with poor drainage or failed protective layers, which can lead to pitting and thinning.^[40] Fatigue from cyclic wave loading contributes to structural stress, potentially causing cracks and subsequent leaks if not addressed.^[41] Steel coamings, vulnerable to these environmental factors, require vigilant monitoring to prevent progressive deterioration.^[40] Maintenance practices focus on preventive measures and targeted repairs to sustain coaming functionality. Anti-corrosive coatings are applied to exposed steel surfaces after surface preparation, such as rust removal, to inhibit further degradation in marine conditions.^[43] Dents and minor deformations are repaired through welding, followed by grinding to restore original contours and ensure proper mating with hatch covers.^[41] If deformations or thickness loss compromise structural adequacy—typically evaluated against class society criteria—full replacement of affected sections is necessary to avoid safety risks.^[22] Regular cleaning of coaming drains and tops prevents debris accumulation, which exacerbates corrosion and operational failures.^[40]

Safety Standards and Regulations

The International Convention for the Safety of Life at Sea (SOLAS), specifically Chapter II-1, Part B, mandates that hatchway coamings be constructed to ensure weathertight integrity, preventing water ingress into cargo holds and maintaining structural stability during voyages.^[44] This requirement applies to all cargo ships, emphasizing substantial construction aligned with the ship's position and operational demands to uphold overall hull watertightness.^[44] Classification societies, through the International Association of Classification Societies (IACS), enforce requirements for hull classification surveys of hatch coamings under Unified Requirement (UR) Z7, including close-up examinations and thickness measurements as part of the mandatory five-year renewal survey cycle.^[45] UR S21A provides standards for the scantlings of hatch coamings. For certification of watertightness, coamings must undergo hose testing at a minimum pressure of 2 bar (200 kPa) to verify sealing effectiveness, often supplemented by chalk tests or ultrasonic methods.^[46] Bulk carriers additionally require compliance with IMO guidelines, such as those in MSC/Circ.1071, which specify structural integrity checks for coamings to mitigate risks from heavy bulk cargoes.^[47] Following the 2000s, regulatory enhancements for container ships have addressed increased stack weights, incorporating updates under the International Convention for Safe Containers (CSC) amendments—such as the 2008 raise in maximum gross mass to 30 tonnes—and IACS UR S21 revisions, as updated in January 2023, to strengthen coaming scantlings for higher vertical loads.^[48]^[49]^[29] These changes ensure coamings support enhanced container securing arrangements without compromising weathertight performance.^[49]

References

[1]
Coaming - Wärtsilä
A protrusion formed around an opening. Its purpose is to prevent water from running into an opening or to compensate for the strength loss due to cutting ...Missing: definition engineering
[2]
Hatch Coaming - an overview | ScienceDirect Topics
Hatch coamings refer to the raised structures that extend in a fore and aft direction beyond a hatch opening on a ship's deck, designed to provide additional ...Missing: nautical maritime
[3]
Different Types And Designs of Hatch Covers Used For Ships
May 8, 2021 · The major objective of hatch covers and coamings on ships is to prevent the ingress of water into the cargo hold and protect the goods from ...
[4]
COAMING Definition & Meaning - Merriam-Webster
Etymology. probably irregular from comb ; First Known Use. 1611, in the meaning defined above ; Time Traveler. The first known use of coaming was in 1611. See ...
[5]
What does Coaming mean? - Maritime Goods
Meaning of "Coaming" Strictly speaking, coamings are the fore and aft framing in hatchways and scuttles, while the athwartship pieces are called head ladges, ...Missing: engineering | Show results with:engineering
[6]
Hatch cover maintenance - Bernhard Schulte Shipmanagement
Nov 3, 2022 · Drain systems consist of a drain channel, drain hole in the coaming table and a drainpipe ﬁtted with a non-return valve. The non-return valve ...<|separator|>
[7]
Coaming - Etymology, Origin & Meaning
coaming(n.) 1610s, nautical, "raised border or edge of a hatch" (to prevent water on deck from running below), of unknown origin.
[8]
Deck Branch Training - Part 2
Coamings are usually fitted with angle iron stiffeners all around the outside and with coaming stays from the stiffener to the deck. Hatch cleats are steel ...
[9]
[PDF] Risk Focus: Hatch Covers - Nautical Institute
The use of low-friction material is recommended to allow for smooth movement between panels and coaming, and to avoid the disturbing noise that is created by ...<|control11|><|separator|>
[10]
What is function of Hatch Cover and its Purpose ? - MarineGyaan
The purpose and function of a hatch cover and its coamings is to prevent ingress of water into a cargo hold after a large opening has been cut in the deck ...
[11]
[PDF] THE STRUCTURES OF ENGLISH WOODEN SHIPS
Beginning early in the sixteenth century, English shipbuilding methods underwent a major revolution with the introduction of Mediterranean/Iberian carvel, ...
[12]
[PDF] the hulks of a 19th-century cowes ketch and a lighter at centenary ...
Feb 5, 2025 · The coamings of the hatch were made of thick planks that were protected by a strip of iron. The coamings were bolted directly onto the beams ...
[13]
Shipbuilding: 1800–Present | Royal Museums Greenwich
Shipbuilding shifted from wood to iron in the 1800s, then to steel in the 1880s. Steam engines and propellers were introduced, and since 1940, ships are built ...
[14]
Wood To Welding The Evolution Of Shipbuilding Materials | Stories
Oct 1, 2024 · Copper was used by the British and the United States in the late 18th century to cover wooden hulls, protecting them from rot and woodworm, but ...
[15]
History - MacGregor.com
The MacGregor brothers invented steel hatch covers in 1929, forming the company in 1937; the market has benefitted from its innovations ever since.Missing: coamings | Show results with:coamings
[16]
[PDF] Workhorse of the Fleet: A History of the Liberty Ship
Gus Bourneuf Jr. A history of the design and experiences of the Liberty Ships built by American Shipbuilders during WWII.
[17]
J. GERBER & COMPANY v. SS Sabine Howaldt, 310 F. Supp. 343 ...
MacGregor hatch covers and similar designs were developed after World War II and are now widely used, especially on new vessels. They are approved by ...
[18]
The classification of ASTM A131 steel grades - BBN Ship Steel
ASTM A131 steel is divided into four grades: A, B, D and E. The yield strength (not less than 235 Mpa) and tensile strength (400-520 Mpa) of these four grades ...
[19]
Shipbuilding Steel Grades: Uses And Choices - SteelPRO Group
Dec 9, 2024 · Common grades include A, B, D, E, AH32, DH32, EH32, AH36, DH36, EH36, and FH36. This article provides an overview of the various shipbuilding steel grades.<|control11|><|separator|>
[20]
Section 5 Hatch coamings
13 Material for hatch coamings is to be steel, according to the requirements for ship's hull. ... 17 On ships carrying cargo on deck, such as timber, coal ...Missing: components wooden borders
[21]
structural steel for ships | Total Materia
Ordinary strength grades include A, B, D, DS, CS, and E, all featuring a specified minimum yield point of 235 MPa. Higher strength grades comprise AH, DH, and ...
[22]
[PDF] Hatch Covers, Hatch Coamings and Closing Arrangements - ClassNK
Jan 30, 2024 · IACS Unified Requirements (UR) S21 and S21A specify requirements for hatch covers, hatch coamings and closing arrangements. UR S21 applies to ...
[23]
Safer seas with stainless steel
Mar 11, 2019 · Because they are corrosion resistant, they are compatible with a great variety of cleaning methods and products, thereby offering owners a ...
[24]
Wooden Ship Building – Spring 1951
Jul 20, 2020 · The hatch coamings were placed around the hatchways; these were of oak and placed on the deck planks around the openings. Their timbers were ...Missing: origins | Show results with:origins
[25]
Hempadur Impact - Hempel
Hempadur Impact is recommended as a dedicated heavy duty coating for hatch coamings and cargo holds of bulk carriers. product.downloads.types ...
[26]
Nippon Paint Marine Coating 'Makes Impact' in Tough Bulk Sector
May 22, 2020 · “We developed Neoguard Toughness following demand from shipowners for a more impact-resistant epoxy coating system for holds and hatch coamings ...
[27]
https://www.iacs.org.uk/publications/unified-requirements/
[28]
[PDF] S21 - Hull Classification Surveys
Jan 6, 2023 · P = pressure on coaming, in kN/m2, taken as PA defined in 2.2.1 in general and as PPCCCCCCCC defined in 2.2.2 for Type-2 ships ...
[29]
Bearing pads - Wärtsilä
Support pads installed on the hatch coaming in order to transfer the weight of the cover, and any cargo it may be carrying, to the ship hull.
[30]
How many shipping containers could be stacked on top of each ...
Jun 26, 2021 · Typically they can tolerate 220 t, and the maximum overall weight per container is around 30t. This means that you can stack at least 7 fully ...
[31]
MGN 709 (M) Recommendations for 'Short range' yachts, when ...
Jun 23, 2025 · Companionway hatch openings which give access to spaces below the weather deck shall be fitted with a coaming, the top of which is at least 300 ...
[32]
SCUPPER Definition & Meaning - Merriam-Webster
The meaning of SCUPPER is an opening cut through the bulwarks of a ship so that water falling on deck may flow overboard. How to use scupper in a sentence.Missing: coaming | Show results with:coaming
[33]
Coaming Modification - Bowers Fly Baby
The coaming is the opening in the turtledeck for the pilot. The stock open shape, viewed from above, is a semi-circle with the curved part facing aft.Missing: definition | Show results with:definition
[34]
Cockpit coaming padding - Hatz BiPlane Association
Foam pipe insulation. The smallest size I've found still needs something else inside it to make it fit the 3/8ths tubing around the coaming.Missing: aviation | Show results with:aviation
[35]
http://www.hatzbiplane.com/phpBB/viewtopic.php?t=82
[36]
4 essential topics about Roof Curbs for Roof Construction and ...
Jul 7, 2023 · It is important to note that proper waterproofing around the roof curbs is essential to prevent leaks and damage.Missing: architectural coamings
[37]
How to Choose a Kayak Spray Skirt | REI Expert Advice
Neoprene skirts have rubber or neoprene rands that grip the cockpit coaming firmly, so the skirts can withstand the force of breaking waves or rolling a kayak.
[38]
https://www.rei.com/learn/expert-advice/spray-skirt.html
[39]
[PDF] Care and survey of hatch covers of dry cargo ships - No. 15
3.1 The Classification Society Rule requirements for the construction and inspection of hatch covers, cannot, alone, ensure that the hatch covers will be ...
[40]
Hatch Cover Maintenance & Inspection - Britannia P&I Club
Dec 1, 2013 · The aim of this guidance is to highlight the most common defects and to emphasise the importance of proper maintenance routines.
[41]
Bulk carriers hatch cover inspection & survey guideline
Traditionally, hatch covers and hatch coamings are inspected every year by the Surveyor of the Classification Society , as prescribed in Article 14 of the Load ...
[42]
[PDF] HATCH COVER MAINTENANCE - Britannia P&I Club
Hatch cover landing pads should be maintained in a good condition at all times, ensuring that any corrosion is dealt with in a timely manner and that the pads ...
[43]
[PDF] S21A - Hull Classification Surveys
Hatch Coamings and Closing Arrangements of. Cargo Holds of Ships. Deleted on 1 July 2024 as UR S21A was superseded by UR S21 Rev.6. S21A. (May 2011). (Corr.1.
[44]
[PDF] Hatch cover securing and tightness - No. 14
6.2 This is to be followed by a hose test with a pressure of water not less than 200. kN/m2. The following may be assumed for guidance: Nozzle diameter :.
[45]
[PDF] IMO Ref. T1/1.04 MSC/Circ.1071 GUIDELINES FOR BULK ...
Lashings should not be secured to the covers or coamings unless these are designed to withstand the lashing forces. It is therefore particularly important to.
[46]
International Convention for Safe Containers (CSC)
The 1972 Convention for Safe Containers has two goals. One is to maintain a high level of safety of human life in the transport and handling of containers.Missing: post- 2000
[47]
Development of the IACS Unified Strength Requirements for Hatch ...
Aug 7, 2023 · Specifically, for the complete revision of UR S21, the definition of load model, net scantlings, stress calculation methods, and safety factors ...