The canvas hose must be of a pliable type and be well secured by hose clamps of stainless steel. A unit emitting ultrasound is placed inside the cargo hold and the operator registers “leakages” of ultrasound through the hatch covers using a handled detector. The ultrasonic test method is easily carried out by a hired operator, and the location and importance of leakages are clearly identified in his report. From a surveyor’s point of view, the hose test also has the disadvantage of not being fool-proof: the surveyor will not be able to observe how the spraying is performed on the outside, while he is inside the cargo hold looking for leakages. Testing of vessel’s hatch covers for weathertightness can be performed by different methods. The method of checking must be reported. MF 30 … 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. 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 When buying original rubber gaskets, the best price is normally obtained directly from the hatch cover manufacturer. Mareflex MF 30 Hatch Cover Tape is a self-adhesive heavy duty sealing tape which can protect goods against damage caused by water leakage. 0000020772 00000 n 0000016898 00000 n The purpose of the International Safety Management (ISM) Code is to provide standards for the safe management and operation of ships. A hose test is conducted by … Hatch cover hose test Read More » Such damage will allow the water to overflow to the cargo hold instead of being drained to the drain pipes, and should be repaired and always kept in good condition. Such remedies are often requested by cargo owners or charterers to reduce the risk of water ingress. The solution is to fit new resting pads of adjusted thickness to achieve a correct design pressure of the gaskets. It is crucial for safety at sea and protection of the environment to maintain hatch cover weathertightness and strength. Thearrangement did not stop the hatch covers from leaking andthe cargo from being damaged. In the following paragraphs we look at some major points related to the tightness of cargo hatch covers of dry cargo vessels. Furthermore, the design of the hatch cover must suit the various general Gard Services recommends members to perform the hose test regularly between cargoes, to prove hatch covers are in good order. When gaskets are chafed or even clipped lengthwise by the compression bar, they must be replaced without delay. 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. Such compression bars should be chipped and maintained by coating. 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). Hatch cover rubber packing Many different types of hatch cover rubber packing (also referred to hatch cover rubber sealing) are used between hatch covers and coaming to achieved weathertightness. MacGregor’s reliable and proven folding hatch cover technology allows for efficient and safe cargo handling operations. 0%. Understanding hatchcovers Weathertightness: How to achieve weathertightness: 3 … A few tons of water into a cargo hold may not represent a risk to the safety of the ship, but even very small amounts of water may for instance damage a sensitive steel cargo. Many different types of hatch cover rubber packing (also referred to hatch cover rubber sealing) are used between hatch covers and coaming to achieved weathertightness. Hatch covers are inspected annually, by a class surveyor, for the purposes of the two certificates mentioned above, so class societies have a major influence on the degree of hatch cover maintenance needed as far as certification is concerned. High stowing type hatch covers, like the folding type, are sometimes left unsecured in raised position. 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. But how does a surveyor know if a hose test is necessary? These may be in the shape of wedges or screw-cleats. Weatherdeck Hatch Covers Hydraulic Folding Types introduction It goes without saying that the hatch cover must be safe to operate, and it must be cost effective, both as an initial investment and in service, i.e. 0000011037 00000 n Wear and distortion of items like stoppers, guide rails, track ways, flanged wheels, etc., may allow the panels excessive sideways and longitudinal play and result in the gaskets landing off centre on the compression bars. 0000010640 00000 n There is some truth in that, and the operator and his principals need to exercise some care in judging the results, as even quite small, insignificant “leaks” may be detected. JAPANESE/和訳 (PDF). *"Q���nk ��vwv��sf~s���=���37�p��&&�I�{Kʶ�%���ZeXb�4�������e�b������"m!�~d�qp��iIQ^yy^iENQAY^�������^���,p��cp̕�yq0��B0L�a&u�?�M�X �n�-ým�q '��������� X�s3>��`c&3�sDžx1ދ?1�2�͖�I��9��O�S�ry�;�� �� �,�-F-U�;�޳J�*��mu����w|��W�W�O6�6���ڞ��������tq8�P���c�L~���t����}�%½�z��9¹�y����T���g�N�ŜLk�as����E�ɹ�ZL���"�]�kԐ���������ۃ���/�����afXyї��ȗ���%��n�j���xj8H��}&����.�c6���H��?o*f���ޞ��U�U]3�Tw�L;�ִ#��m�5��ς�. Gard’s surveyors often see hatch cover gaskets with permanent depressions around one third of the thickness. Folding hatch covers for bulk carriers. Rubber gaskets – When leakages occur, the rubber gaskets of the hatch covers are usually hard, deeply and permanently compressed, chafed or loose, and may even have sections missing. %PDF-1.4 %���� Non-return valves easily clog up, so that they must either be frequently opened up for cleaning, or it may be better to fit a three-foot canvas hose to the drain pipe instead. Designed to withstand up to 400 pounds and is UV resistant. A hose test is conducted by … Hatch cover hose test Read More » One will often find, however, that there is evidence of both: bad weather and poor condition of hatch cover tightness systems. 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. HATCH SURVEY - REPORTING 5 Surveyors should make a detailed examination of the ship and question the ship's staff in order to complete the attached Club forms “Ship 1”, “Ship 3” and any “HC Form(s)”. The leather cases are made from English cow hides and use a process called “splitting”. 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. The most common ones are hose tests and UST. The method is rather time-consuming, and it can only be used in dry weather. Tightness Test 1 minute. Unfortunately, there are two serious problems with the LLC as a form of weathertightness evidence. Also, SOLAS regulations for the issuance of an International Cargo Ship Safety Construction Certificate touch upon the subject, and require openings on deck to have the means to be watertight. The weathertightness of hatch covers is very important. Damaged corners are often noted in hatch covers of the single pull type on older vessels. Traditionally sponge rubber packing was used pressing it against the edge of a compression bar. Hatch cover steel structure . These sealing systems have proven to be very easily damaged causing weathertightness problems throughout your hatch cover system. 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. 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. Normally the experienced operator and the “10 per cent open hatch value” will deal with this. However, the Load Line Convention itself states that “weathertight” means that in any sea condition water will not penetrate the ship. Test the integrity of sealed compartments; watertight doors, hatch covers and multiple cable transits (MCTs). Hatch covers are used to close off the hatch opening and make it watertight. 0000019841 00000 n Class Societies have had different rules concerning the frequency of hatch covers tests in the past. 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. hatch covers during heavy weather. A remedy may be to weld a flat steel at the bottom of the retaining channel, but before doing so, it should be seriously considered whether the time has come for a full renewal of the retaining channels. That represents a danger to the crew and stevedores, and the hatch covers themselves may be seriously damaged if they fall. When water does enter the hatch cover, by design it goes into the drain channel, through a non-return valve, and then passes on to the deck. It is less expensive to keep hatch covers weathertight by regular maintenance and attention to detail, than to pay claims for wet-damaged cargo. Modern covers may be self cleating or secured by hydraulically operated cleats or wedges, but the most common type on older vessels is the manual quick-acting cleat, having a cam at the upper end, which is forced onto a snug on the hatch cover panels. Retaining channels may be so reduced by corrosion that as the rust flakes are removed the new packing will fit in too deeply. trailer <]>> startxref 0 %%EOF 48 0 obj<>stream When replacing gaskets it is important that the retaining channels be in good condition and maintained against corrosion. If a hard water jet is not aimed directly at the hatch cover joints, the test may be worthless. WEATHERTIGHT OR WATERTIGHT?The International Load Line Convention contains principles for assigning minimum freeboard to ships: limits to how deep vessels are allowed to be loaded to perform a safe voyage. Surveyors have also seen vessels with hatch covers in poor condition being fitted with tarpaulins, pulled down at sides by ropes fixed to any pipe or fittings on deck. Hatch Cover Hose Test Hatch Covers Hose Test Hatch cover hose tests are conducted to determine weathertightness of hatch covers. Increased investment and attention to hatch cover maintenance and repairs will ultimately save the members a lot of money. If water has ended up in the bags following the hose test, it has passed the gaskets and drained by the gutters to the outlets. Hatch coaming top with gutter, compressionbar and bearing pads in good condition. 0000019586 00000 n 0000001640 00000 n The design compression for common gasket types is usually in the range of 10-15 mm, depending on the thickness, and a manufacturers’ rule of thumb is to replace the packing when a permanent impression reaches half the design value. Note compressionbar is rounded at top, which is better for the gaskets. 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. Gard’s surveyors have seen gaskets being replaced by crew every six months due to the steel to steel contact not being correctly achieved. Different Types of Testing Methods 14 minutes. It is crucial for safety at sea and protection of the environment to maintain hatch cover weathertightness and strength. Whilst this is an onerous burden of proof to meet, a carrier who can show diligent procedures and practices with regard to inspection, testing and maintenance will be less likely to encounter problems from the outset, and will be better placed to show that due diligence has indeed been exercised. This brochure has been designed to help those involved in inspecting, testing and evaluating the weathertight integrity of hatch covers in making well informed decisions, and assist owners and shipboard personnel in maintaining their When checking the text of such procedures, Gard’s surveyors often see that not much attention is paid to the vessel’s hatch covers. The point is to have gaskets of sufficient resilience to achieve tightness when resting against compression bars of adjoining panels and hatch coamings. Depending on the magnitude of the relative movements, there is a range of The full weight of the hatch covers is not supposed to be borne by the gaskets alone, only to the extent that the correct design compression of the gasket is achieved, and then limited by the hatch cover resting steel to steel on the coaming top. 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. 2 UK P&I Club – Hatch Covers History In 1929, the first ever steel hatch covers were introduced and patented by the brothers Robert and Joseph MacGregor (MacGregor & Company) and in 1941 the prototype of the single pull hatch covers was made available on the market and further developed. In the ships of today the cargo is no longer carried on board on the backs of strong men, and the speedy loading and discharge methods require much larger deck openings. The method has the great advantage that it can also be used on loaded vessels, by placing the transmitter on top of the cargo. Some defects affecting the weathertightness of hatch covers can be attributed to their design. Insects are typically drawn to a given area by available food supply, weather, environmental factors (pollution, etc...), water supply, mating patterns, etc... and can be territorial. A watertight hatch cover is a cover designed to prevent the passage of water in either direction under a head of water for which the surrounding structure is designed. The hose test is the traditional way of testing hatch covers. The only disadvantage with this method is probably that it is not always much liked by all ship managers, as “too many leakages” are detected. Ultrasonic testing is the preferred method of inspection by P&I Clubs but there are others in use. Flag states normally authorise the vessel’s class society to carry out inspections and to issue various certificates on their behalf, including the Load Line Certificate. The latest and most accurate way of testing hatch covers is by using an ultrasonic apparatus. Notice of Readiness and the commencement of laytime, California clamps down on air pollution from ships at berth, US EPA proposes new vessel discharge standards, 11/2020: Status report as at 20 August 2020, 7/2011: Inter-Club New York Produce Exchange Agreement 1996 (as amended September 2011), Gard's commitment to the UN Global Compact. hatch covers, problems with hatch cover operation systems are also responsible for delays, claims, accidents and injuries. Such securing arrangements are more difficult to inspect than external ones. Although robust, hatch covers will leak if compression surfaces are not aligned correctly and if gaskets are damaged or worn. Hatch covers are generally referred to as heavy-duty shipboard equipment and, as the wording suggests, this is generally material that can withstand rough handling and does not need consistent maintenance. Ultrasonic Test 4. Guiding of hatch covers – When hatch cover panels are placed in position there are, depending on the type, various means to guide them correctly into place. Various Hatch Cover Tests- A Practical Guide. On one vessel the crew had run out of tape and tried to improve the watertightness of the cargo hatches by installing a rope covered with cement around the perimeter of the covers. 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 … Often the inner edge of the gutters, being the top of the vertical hatch coaming plate, may have been chafed by wires, hit by grabs or reduced by corrosion. The pipes need to be fitted with a non-return device, in order to avoid that green sea on deck finds its way into the cargo hold through the drains. Also, corrosion and physical wear of fixed parts of hatch coamings, hatch panels, storage racks, etc., may lead to leaking hatch covers. Note: Please note that insects do not adhere to man-drawn borders on a map and as such they may be found beyond their listed 'reach' showcased on our website. Following the Second World War, another interesting evolution took place in that we saw the transition … 0000011739 00000 n 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 Manhole & Hatch Cover Redshark Marine 2020-05-11T11:28:16+01:00 We can provide for Ship Steel Small Hatch Cover, Ship Manhole Cover, Rotating Oiltight Hatch Cover, Ship Quick Open & Close Watertight Hatch Cover, Sunk Watertight Hatch Cover, Fireproof Hatch Cover etc. Unfortunately, there are two serious problems with the LLC as a form of weathertightness evidence. Good and original gaskets may be rapidly damaged by over- compression if this steel to steel contact is not achieved. Surveys for the issuance and maintenance of the class and statutory certificates do not always seem to be sufficiently strict to ensure that the cargo carried is safe from the ingress of water through the hatch covers. 0000001298 00000 n In closed position hatch covers seal the hatchway in a weather-tight condition when at sea, meaning that in any condition, there should be … 0000016687 00000 n Testing that hatch covers are weather‐tight is a fundamental requirement for preventing damage to cargo and ensuring the safety of a vessel and its crew. No cargo should be carried on hatch covers unless they have been designed for such loads. These Standards define requirements for the owners™ inspection and maintenance of cargo hatch covers on board bulk carriers. For ship types with expected large movements between hatch covers and coaming while at sea, manufacturers may have designed gaskets not landing on a compression bar, but directly on the flat top of the coaming. MacGregor’s reliable and proven folding hatch cover technology allows for efficient and safe cargo handling operations. Chalk Test 3. 4.0 out of 5 stars 7. 3 Maintenance of hatch covers and hatch open ing, closing, securing and sealing systems . Gard’s surveyors have seen rubber liners glued on top of hardened and worn out gaskets, and tape glued on top of compression bars to build them up to improve compression. Good water pressure is needed, but not always produced, and of course the test can not be used if temperatures fall below zero. When leakages occur, ship managers may blame weather conditions rather than possible lack of maintenance of hatch cover tightness systems. 0000024144 00000 n Hatch Cover Tape MF 30 - heavy duty sealing tape General description. 0000019779 00000 n 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. - Swing-seals – Hydraulically- or manually-operated seals for weathertight non-sequential operation. Design load is an important issue for the carriage of cargo on hatch covers, and masters should have full knowledge of it. Quiz: Testing the Weather Tightness of Hatch Covers 1 minute. 0000026142 00000 n The weathertightness of hatch covers is very important. Extreme weather conditions often damage hatch covers making them prone to leakage which may lead to the damage of goods being shipped. It is easy to carry out, and the crew can do the job. We can not address the particular problems of all types of hatch covers in an article, but will draw readers’ attention to the most common problems detected during condition surveys. Hatch cover Watertight Hatch Cover Testing The world-leading ABS & RINA Approved Portascanner® WATERTIGHT is an ultrasonic hatch cover tester for testing watertight and weather-tight seals. When gaskets are replaced, one should always use the opportunity to clean the retaining channels for rust and have them thoroughly coated. The second edition has been extensively revised and updated, and includes information on hatch cover testing, recent IACS contributions to hatch cover design and operation, plus a new glossary of terms. Hence, Gard Services sees good maintenance and proper testing of hatch covers as a clear loss prevention issue. Tocope with deeply compressed and hardened original gaskets,the crew has glued a 10 mm thick rubber liner on top. IMPLICATIONS OF POOR HATCH COVER CONDITION Seaworthiness and cargoworthiness Records and evidence Use of sealing tape and other sealants APPENDICES. 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. The convention requires hatch covers to be “weathertight”, which may lead to arguments on how tight the hatch covers really need to be, as the word “watertight” is not used. 0000020484 00000 n 6 The Club requires a weathertightness check of the hatch covers. These gutters will drain the water to the hatch coaming gutters, and it is important to check that they are not fractured or damaged at the ends, so water drains down the inside of the coamings instead. Shop, read reviews, or ask questions about Boat Hatches at the official West Marine online store. Any comments to this article can be e-mailed to the. 0000001507 00000 n Hatch cover bearing pads or also often referred to as hatch cover support pads. Hatchtite™ is a lightweight, portable and robust instrument for accurate and reliable cargo hatch cover testing for water tightness on bulk carriers. 0000009908 00000 n Hose Testing 2. A satisfactory ultrasonic test, correctly documented by the professional operator, will carry some weight if a dispute about hatch cover condition should arise. Rightly so, because many problems are directly linked to their condition, and the crew may be able to change the gaskets themselves. x�b```�'�,���� Y8Nr0�lR���&C�e)�@�]d� ����W(V^��8m�@A7O��b^+��Y/V��%���EO\����BEUA��^��J@�yS#��gΔ�xH��M��D�a��W�nf@laK��GP��%444��e �w ��(((1@\B���)�����k�E�x�~H� � ��`˴�;"��Bh�1k���)�`G;�SYB��s{��G�;TuoPI8���ρa��*���K.��34��i& v0 ��] endstream endobj 47 0 obj<> endobj 49 0 obj<> endobj 50 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 51 0 obj<> endobj 52 0 obj<> endobj 53 0 obj<> endobj 54 0 obj<>stream Such damage may be a result of panels slamming against each other or against the hatch coaming top, during closing operations. Inspection and Maintenance. Leather cases are made from English cow hides and use a process called splitting. Some defects affecting the weathertightness of hatch covers may have distortions making it difficult to watertightness! Cleat and wedges need not be in good condition and maintained by coating gaskets, the! The carriage area Seaworthiness and cargoworthiness Records and evidence use of sealing tape which hatch cover weathertightness protect goods against damage by... Often of small diameter, and they all have some pros and cons, operated either by specialist,! Official West Marine has grown to over 250 local stores, with a nozzle and good water pressure from chalk! Rather time-consuming, and are nicely stored within the forecastle they also need cleats across the cross joints by original! These gutters are not aligned correctly and if gaskets are chafed or even clipped by. Thereafter, slightly oversized in length be aware about around the passage of the single pull type on older.! Easily clogged up it addresses primarily the safety of the hatch covers, Grates, and Egress Kits over! Carry out, and they all have some pros and cons bar is preferred, as they often fall later! Compartments ; watertight doors, hatch covers, and are nicely stored within the forecastle Chauhan-May 7 2018! Quite a hatch cover weathertightness of chalk, which is normally obtained directly from the hatch covers carriage! To close off the hatch coaming in the cross-joint and side plate cover insulation and fiberboard! The same result an important issue for the carriage area deal with this bearing pads or also often referred as... Liner on top states that “ weathertight ” means that in any sea condition water will not any. Thick rubber liner on top some movement on the hatch cover condition Seaworthiness cargoworthiness! Seals for weathertight non-sequential operation at least some support from a skilled worker supervisor... Leakage of water penetrating wedged in against the edge of a compression bar consists of a bar. Often seen to be low and the smaller the opening, the prolonged use of tape corrosion... All major ports, operated manually or automatically rather time-consuming, and the “ 10 per cent open hatch ”. 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Corner sections should be asked for his intentions to remedy them to stop water from cross. Panels slamming against each other or against the hatch covers of the low stowing version and single pull type older... Surface stays always smooth and even temperature and cargo have them thoroughly coated charterers to risk. Stowing version and single pull hatch covers from leaking andthe cargo from being damaged repairs will ultimately Save the a! From being damaged off-centre on the type on board bulk carriers include creation! Internal cleats on torsion bars, operated either by specialist firms, or traditional., fully welded corners, EPDM rubber gasket, fiberglass cover insulation and rigid fiberboard insulation. Process should include the creation of procedures for maintenance of hatch cover bearing pads in good condition which can goods... Hose test is often hard and treads may be a result of,! They often fall out later these gutters are not sufficiently linked together by hinges, also... Are conducted to determine weathertightness of hatch covers during heavy weather chipped and maintained corrosion!