Gard’s surveyors often see hatch cover gaskets with permanent depressions around one third of the thickness. Wooden wedge type coversWooden hatch covers appear to be the connecting link between traditional wooden sailing vessels of past and today’s modern ships made of steel. 0000026142 00000 n Gard’s surveyors see a lot of poorly maintained cleats in older vessels, and the common problems are that the cleat is seriously weakened by corrosion or that the rubber disc is hardened and without elasticity. Tag: hatch cover weathertightness. Some of the disadvantages of the hose test are that it sometimes becomes just a lot of messing around with water and it is not recommended to be carried out on loaded vessels – more than once the hose test itself has caused water damage to cargo. MacGregor’s reliable and proven folding hatch cover technology allows for efficient and safe cargo handling operations. Some owners may then choose to install additional cleats, like screw-cleats, to solve the problem, but it is then important to check that the additional cleats closing one joint better do not open the next one. Leakage traces on inner hatch coaming plating It is less expensive to keep hatch covers weathertight by regular maintenance and attention to detail, than to pay claims for wet-damaged cargo. In a weathertight hatch cover system, various key parts need to work in unison in order to ensure that weathertightness is achieved and can be maintained throughout the voyage. To ascertain the same, there are many hatch cover tests which a ship's officer and the crew should be aware about. Nuts and treads may be so corroded that adjustments can not be carried out. On oldcleats the rubber washer is often hard and treads and nutsare corroded due to lack of maintenance. • It is important to ensure that the cargo hatch covers’ system components are … The money spent on expensive tape and fillers could be better used if spent on regular maintenance of the hatch covers and on well planned renewals of the original gaskets. Retaining channels may also have been damaged by contact of grabs, wires for pulling, etc. DasMarine 2Pack of 7 inch Hatch Round Non Slip Inspection Hatch w/Detachable Cover for Marine Boat Yacht, 10" External Diameter, 7" Opening Size. But how does a surveyor know if a hose test is necessary? In closed position hatch covers seal the hatchway in a weather-tight condition when at sea, meaning that in any condition, there should be … Retaining channels – The gasket retaining channels are among the weakest construction parts of the hatch covers. 3.2 Weathertight Hatch Covers 3.2.1 Drainage is to be arranged inside the line of gasket by means of a gutter bar or vertical extension of the hatch side and end coaming. A recommendation to carry out a hose test of the hatch covers “as necessary” gives surveyors some freedom to omit the test when faced with practical difficulties (e.g., loaded vessel when no ultrasonic testing apparatus is available) and to carry out only a visual inspection. Also, it is clearly seen from the chalk marks if the gasket lands off-centre on the compression bar. Also, corrosion and physical wear of fixed parts of hatch coamings, hatch panels, storage racks, etc., may lead to leaking hatch covers. Such damage may be a result of panels slamming against each other or against the hatch coaming top, during closing operations. The hose test is the traditional way of testing hatch covers. Pre-shaped corner sections should be glued in first and the straight lengths of gasket thereafter, slightly oversized in length. No cargo should be carried on hatch covers unless they have been designed for such loads. This divides the hide in two which halves the thickness of the leather; the two halves are then coated with a vinyl plastic to make the resultant leather supple, very smooth and weatherproof. These regulations have to be complied with for the issuance of an International Load Line Certificate. However, the Load Line Convention itself states that “weathertight” means that in any sea condition water will not penetrate the ship. Cheap rubber gaskets will rapidly become permanently compressed and the loss of resilience may cause lack of tightness after a few months of service. A carrier’s liability for cargo damage relating to sea water ingress via the hatch covers often depends on whether he can demonstrate that he exercised due diligence to make the vessel seaworthy before and at the beginning of the voyage in question. Using this method, a surveyor reduces his chances of being fooled by the crew if he chooses to observe the testing from inside the hold. For a more complete, practical guide to all types of hatch covers, readers may wish to refer to the book Hatch Cover Inspections – A Practical Guide, recently published by The Nautical Institute.3. The ability of the most commonly used hatch covers to prevent water ingress depends upon the effectivness of the seal between sections of rubber packing and steel compression bars. The lay-out of the different bearing pads consists of a bearing pad (1), a shim plate, an elastic piece, a housing frame (2), a locking pin and a mating plate (3). Chalk Test 3. If that is necessary, the ship manager should consider whether his crew is qualified for the job, or whether it is necessary to go to a repair yard with specialists or to ask the hatch cover manufacturer for support. Good and original gaskets may be rapidly damaged by over- compression if this steel to steel contact is not achieved. Window Well Covers, Grates, and Egress Kits Join over 400,000 satisfied homeowners. When all such areas of the coaming top plate are weakened, one risks losing the covers under extreme weather conditions. Traditionally sponge rubber packing was used pressing it against the edge of a compression bar. Hence, Gard Services sees good maintenance and proper testing of hatch covers as a clear loss prevention issue. The drain pipes aft are often of small diameter, and are easily clogged up. Tocope with deeply compressed and hardened original gaskets,the crew has glued a 10 mm thick rubber liner on top. When leakages occur, ship managers may blame weather conditions rather than possible lack of maintenance of hatch cover tightness systems. Very large openings actually, but manufacturers have been able to design and build strong enough steel covers and closing devices to cope with the demand – strong enough and tight enough at the time of testing and delivery of the new ship, but as the vessel ages, however beautifully, the hatch covers are prone to suffer from wear and tear, and problems of tightness arise. Folding hatch covers are used on Handysize and Handymax bulk carriers, where it is particularly important to maximise hatch dimensions in relation to the ship’s beam. Gard’s surveyors often see gaps at joints of gaskets, as lengths are cut too short. The low stowing version and single pull hatch covers are designed in a number of panel configurations. In the worst cases, all the wedges have been removed and are nicely stored within the forecastle. 0000011421 00000 n Heat applied by welding to a weakened steel channel may cause deformations, making tightness difficult. Get updates from Gard in your inbox. The disadvantage is that one needs quite a bit of chalk, which is normally not found on board. Hatch coaming top with gutter, compressionbar and bearing pads in good condition. If there has been insufficient compression between the compression bar and the hatch cover gasket, there will be a lack of or incomplete chalk marks on such areas of the gasket. When hatch cover panels are not sufficiently linked together by hinges, they also need cleats across the cross joints of the panels. Approximately one third of all P&I claims are cargo-related. Steel to steel contact – One thing is fundamental to a good result when changing gaskets, and that is to check the steel to steel contact between the hatch covers and the hatch coaming top. Shop with confidence - get free shipping to home or stores + price match guarantee! Their maintenance is cumbersome and often neglected, and retaining channels are often reduced by corrosion and are thus not able to provide sufficient support of the gaskets. 0000001507 00000 n Members are strongly recommended to include instructions from hatch cover manufacturers in the vessel maintenance program, including records of maintenance, tests and repairs. • Proper weathertightness is a key factor in keeping cargo dry. The function of hatch cover tapes is to protect the metal hatch covers on carriage ships against leakage of water into the carriage area. Salient Features Portable steel beams, wooden sleepers, tarpaulin, etc were used for weather tightness.This involved difficulties like placement of hatch sleepers, manual labour involved, closing difficulties in … The leather cases are made from English cow hides and use a process called “splitting”. 0000009386 00000 n Hatch covers on bulk carriers have two basic functions: In open position hatch covers provide access to the holds for loading and discharge of cargo. 5.11 Other Hatch Cover Designs 5.12 Other Cleating Methods 6 The Differences Between Watertightness and weathertightness 6.1 Ram – nek Tape and Foam 7 Care and Maintenance of Hatch Covers 8 Reasons for Hatch Cover Testing by Various Organisations and the Role of the Marine Surveyor in these Tests 8.1 National Based Survey Organisations IMPLICATIONS OF POOR HATCH COVER CONDITION Seaworthiness and cargoworthiness Records and evidence Use of sealing tape and other sealants APPENDICES. 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