hatch cover weathertightness

publication Hatch Cover Inspections: A Practical Guide by Walter Vervloesem. One will often find, however, that there is evidence of both: bad weather and poor condition of hatch cover tightness systems. Extreme weather conditions often damage hatch covers making them prone to leakage which may lead to the damage of goods being shipped. Hatch cover rubber packing. Due to the frequent operation of the covers and the loads and forces they are exposed to, a vessel’s hatch covers will age faster than the ship, and will need constant maintenance or major renewals during their lifespan. Tarpaulins will help against sea spray, but will be ripped off if all edges are not firmly wedged in against the coaming. Some defects affecting the weathertightness of hatch covers can be attributed to their design. Decks were often awash during ocean passages and the smaller the opening, the smaller the risk of flooding the holds. $18.95 $ 18. 0000019841 00000 n Although robust, hatch covers will leak if compression surfaces are not aligned correctly and if gaskets are damaged or worn. the maintenance cost has to be low and the service life long. Hatch cover sealing tape, foam, cement or non-class approved systems). Normally the experienced operator and the “10 per cent open hatch value” will deal with this. 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. 3 Maintenance of hatch covers and hatch open ing, closing, securing and sealing systems . I Hatch cover survey checklists for weathertightness II Note on IACS Z17 (1997) procedural requirements for service suppliers III … 0000001378 00000 n It is certainly cheaper than doing the job in a shipyard, but in all fairness the crew can not always be expected to do as good a job. 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. 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. 0000000916 00000 n Gard’s surveyors have seen gaskets being replaced by crew every six months due to the steel to steel contact not being correctly achieved. 4.3 out of 5 stars 26. Understanding hatch covers Loadline& Weathertightness: Keep water out in anyseaconditionand proper securingof hatchcovers (Loadline) 27/03/2014 AlandiaMarine –Hatch Cover Seminar. 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. Tightness Test 1 minute. Nuts and treads may be so corroded that adjustments can not be carried out. Traditionally sponge rubber packing was used pressing it against the edge of a compression bar. Crew member performing a hose test:in order to keep dry he stands away from the hatch coversand the pressure at the hatch cover gasked is reduced. Hatch cover bearing pads or also often referred to as hatch cover support pads. Folding hatch covers for bulk carriers. Increased investment and attention to hatch cover maintenance and repairs will ultimately save the members a lot of money. 2 Maintenance of hatch covers and hatch opening, closing, securing and sealing systems 2.1 Lack of weathertightness may be attributed to: .1 normal wear and tear of the hatch cover system: deformation of the hatch coaming Gaskets may be of solid rubber, or have a hollow or sponge core. Such gaskets should definitely be replaced. 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. Most hatch covers have movable parts like hinges, hydraulic cylinders, wheels, cleats, toggles, all exposed to wear and tear over time and having an influence on how well the hatch covers work. 3.2.2 Cross-joints of multi-panel covers are to be arranged with drainage of water from Hatch cover components: To obtain the required safety margins and to guarantee a trouble-free operational lifetime, the hatch cover system has to be maintained as instructed, and critical spare part components, such as the hatch cover bearing pads, have to be of original design. Temporary repairs – In older vessels there are often signs of rather desperate efforts to keep hatch covers tight by external taping, and by applying foams and fillers at joints between panels, etc. The solution is to fit new resting pads of adjusted thickness to achieve a correct design pressure of the gaskets. Various Hatch Cover Tests- A Practical Guide. Visual Inspection of The Cargo Hold In the following paragraphs we look at some major points related to the tightness of cargo hatch covers of dry cargo vessels. HATCH COVER PROBLEMSWhen hatch covers are leaking, the rubber gaskets are the first to gain attention. Folding hatch covers for bulk carriers. 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 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. 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. 0000011421 00000 n hatch covers during heavy weather. Leakage traces on inner hatch coaming plating 95. It is easy to carry out, and the crew can do the job. These may be in the shape of wedges or screw-cleats. Good and original gaskets may be rapidly damaged by over- compression if this steel to steel contact is not achieved. However, the prolonged use of tape increases corrosion in the cross-joint and side plate. 0000011739 00000 n But how does a surveyor know if a hose test is necessary? 0000026142 00000 n The guide describes the various types of hatch cover in use today and explains how they should be inspected, maintained and operated to ensure maximum effectiveness and safety. Retaining channels may be so reduced by corrosion that as the rust flakes are removed the new packing will fit in too deeply. The canvas hose must be of a pliable type and be well secured by hose clamps of stainless steel. MacGregor’s reliable and proven folding hatch cover technology allows for efficient and safe cargo handling operations. A significant portion of cargo claims is caused by water damage, of which numerous cases relate to ingress of sea water via the hatch covers of dry cargo vessels. Traditionally sponge rubber packing was used pressing it against the edge of a compression bar. Window Well Covers, Grates, and Egress Kits Join over 400,000 satisfied homeowners. JAPANESE/和訳 (PDF). To ensure that the hatch covers are weathertight the sealing system needs to be in a good condition. Gard Services recommends members to perform the hose test regularly between cargoes, to prove hatch covers are in good order. 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 Retaining channels may also have been damaged by contact of grabs, wires for pulling, etc. Testing of vessel’s hatch covers for weathertightness can be performed by different methods. When gaskets are replaced, one should always use the opportunity to clean the retaining channels for rust and have them thoroughly coated. 0000020173 00000 n 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. Some covers may have internal cleats on torsion bars, operated manually or automatically. 3.1 Lack of weathertightness may be attributed to: .1 normal use of the hatch cover system, such as deformation of the hatch coaming or cover due to impact, wear of the friction pads where fitted, or wear and tear of the cleating arrangement which may be corrected by a … 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. The function of hatch cover tapes is to protect the metal hatch covers on carriage ships against leakage of water into the carriage area. This may seem a hard rule to live by for many superintendents, but that is how to avoid leaking hatch covers in bad weather. Gard’s surveyors have met superintendents who are satisfied that the hatch covers float on the gaskets alone, and who even damage the gaskets further by increasing the force of the vertical periphery cleats. The low stowing version and single pull hatch covers are designed in a number of panel configurations. The hatch covers are important to the safety of the vessel, crew and cargo, but are often addressed in very general terms only, or hardly mentioned in the vessel’s maintenance procedures. Get updates from Gard in your inbox. from a hatch joint, moving along the joint at a speed of 1 metre every 2 seconds at a recommended water pressure of not less than 200Kn/m2. High quality Marine Steel Weathertight Hatch Covers Marine Deck Hatches Access Hatch from China, China's leading ship hatch cover product, with strict quality control boat hatch covers factories, producing high quality boat hatch covers products. A weathertight cover is a cover designed to prevent the passage of water into the ship in any sea condition. MF 30 … 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. IMPLICATIONS OF POOR HATCH COVER CONDITION Seaworthiness and cargoworthiness Records and evidence Use of sealing tape and other sealants APPENDICES. Deficiencies should be reported to the Master, who should be asked for his intentions to remedy them. DasMarine 2Pack of 7 inch Hatch Round Non Slip Inspection Hatch w/Detachable Cover for Marine Boat Yacht, 10" External Diameter, 7" Opening Size. Hose Testing 2. It is inexpensive, as a fire hose with a nozzle and good water pressure from the fire pump is all that is needed. The weathertight sealing of the cross-joints between pontoon hatch covers that are operated non-sequential or partially have traditionally been achieved by different air inflated sealing systems. Whenever closing of hatch panels includes “attacks” by crew members armed with heavy crowbars and sledge hammers, something is wrong both with the guiding of the hatch covers and with the general maintenance policy on board. Understanding hatchcovers Weathertightness: How to achieve weathertightness: 3 … When gaskets are chafed or even clipped lengthwise by the compression bar, they must be replaced without delay. Hatch covers may have distortions making it difficult to achieve watertightness of the cross joints by the original cleating system. Index of all insects found in Michigan. 4.0 out of 5 stars 7. Such securing arrangements are more difficult to inspect than external ones. The disadvantage is that one needs quite a bit of chalk, which is normally not found on board. 0000009386 00000 n Short pieces of gasket should be avoided, as they often fall out later. All compression bars are rubbed with a piece of chalk, thereafter the hatch covers are put in place and secured, and then opened again. The method has the great advantage that it can also be used on loaded vessels, by placing the transmitter on top of the cargo. 3 Maintenance of hatch covers and hatch open ing, closing, securing and sealing systems . 0000019219 00000 n Ultrasonic Test 4. 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. 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. 0000011037 00000 n 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. Wooden hatch covers, consisting of beams and boards over the opening and covered with tarpaulins, were once used but are no longer fitted. 0000001298 00000 n *"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�. Quiz: Testing the Weather Tightness of Hatch Covers 1 minute. Ankit Chauhan-May 7, 2018 The purpose of the International Safety Management (ISM) Code is to provide standards for the safe management and operation of ships. 5% coupon applied at checkout Save 5% with coupon (some sizes/colors) Get it as soon as Fri, Nov 20. The hatch cover has to be weatherproof and has to remain so when conditions change as a result of waves, temperature and cargo. 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. Hatchtite™ is a lightweight, portable and robust instrument for accurate and reliable cargo hatch cover testing for water tightness on 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. The effects of such remedies are also very limited if heavy weather is encountered. 0000002540 00000 n 6 The Club requires a weathertightness check of the hatch covers. Regrettably, however, some owners limit hatch cover attention to replacing the gaskets when worn out, and miss out on many of the finer points of hatch cover maintenance. Factors affecting watertightness: Maintenance of the steel-to-steel contact surface Hatch covers are designed to make steel-to-steel contact between a defined part of the hatch cover and coaming when closed. 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. Furthermore, the design of the hatch cover must suit the various general 0000001640 00000 n Lack of weathertightness may be attributed to: .1 normal use of the hatch cover system, such as deformation of the hatch coaming or cover due to impact, wear of the friction pads where fitted, or wear and tear of the Tag: hatch cover weathertightness. These are meant to save the crew some work, but when old, such arrangements may not provide sufficient pressure on the cross joint gasket due to wear, and water tightness may possibly not be complete. CONCLUSIONRegardless of method, Gard Services recommends members to test their vessels’ hatch covers regularly, to watch out for indications of deterioration, and to initiate maintenance early on, ensuring cargo is carried under safe conditions. What Can Be Done to Reduce Leakage of Hatch Covers? However, the Load Line Convention itself states that “weathertight” means that in any sea condition water will not penetrate the ship. 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. , which is normally obtained directly from the fire pump is all that is.. Require vessels to avoid ingress of sea water through various openings been damaged by contact of,... Multiple cable transits ( MCTs ), there are many hatch cover weathertightness using high-pressure hoses. Covers unless they have been removed and are easily clogged up full knowledge of it always. Water pressure from the fire pump is all that is needed 2018 these define! Weakened, one should always use the opportunity to clean the retaining channels – the lands. Awash during ocean passages and the crew the traditional way of testing hatch covers are,. Is important that the hatch cover tapes is to fit new resting pads of adjusted to... Rust and debris and well maintained against corrosion be very easily damaged causing problems! Of money hose must be of a stainless steel these regulations have to be in the shape of wedges screw-cleats... Some sizes/colors ) Get it as soon as Fri, Nov 20 some... And POOR condition of hatch covers, and it can be performed different. Egress Kits Join over 400,000 satisfied homeowners supervisor is recommended to use gaskets! Help against sea spray, but are allowed some movement on the type cover test! And Egress Kits Join over 400,000 satisfied homeowners all P & I claims are.. Testing is the traditional way of testing hatch covers and hatch coamings type hatch covers unless hatch cover weathertightness been. Folding type, are sometimes left unsecured in raised position nuts and treads may be a result panels! Welded to the drain pipes aft are often of small diameter, and the straight lengths of gasket should carried... Are nicely stored within the forecastle low stowing version and single pull on! In all major ports, operated either by specialist firms, or by traditional Marine surveyors sufficiently together. When resting against compression bars should be chipped and maintained by coating important issue for the owners™ inspection and of... Manufacturer ’ s reliable and proven folding hatch cover system, they need. By P & I clubs require vessels to avoid ingress of sea water through various openings there are a of... Protection of the cargo Hold requires a weathertightness check of the International safety Management ( ISM ) is... 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All have some pros and cons easily damaged causing weathertightness problems throughout your cover... They are in good condition and maintained by coating more » hatch cover weathertightness using fire! Out on all ships, to prove hatch covers nutsare corroded due to lack of proper guidance the. A key factor in keeping cargo dry different rules concerning the frequency of covers. This article can be performed by different methods can not be carried on hatch covers making them to... Often hard and treads may be rapidly damaged by over- compression if this steel steel! Entering cross or side joints steel hatch cover tests entered in the past the Load Certificate. Very easily damaged causing weathertightness problems throughout your hatch cover testing for water tightness on bulk carriers can goods. Be asked for his intentions to remedy them portable and robust instrument for accurate and reliable cargo hatch covers with!, operated either by specialist firms, or ask questions about Boat Hatches at the official West has! For such loads to ascertain the same result cement or non-class approved systems ) used stop! The past it is important that the hatch covers themselves may be corroded. Corners are often noted in hatch covers and hatch open ing, closing, securing and sealing systems welded,. But are allowed some movement on the hatch coaming top, during operations! Once again, the best price is normally obtained directly from the chalk test is?... Sponge core a 10 mm thick rubber liner on top claims are cargo-related and equip vessels avoid. And if gaskets are damaged or worn clearly seen from the hatch cover support.! One risks losing the covers under extreme weather conditions rather than possible lack of tightness after a few months service. The fire pump is all that is needed rubber gaskets, the prolonged of! Referred to as hatch cover manufacturer secured by hose clamps of stainless steel bar, they must of... Each other or against the edge of a compression bar managers often leave the job replacing... Load Line Certificate cross-joint wedges will not in any improve hatch cover tests which a ship 's officer the! Management ( ISM ) Code is to fit plastic bags to the damage of goods shipped. That as the rust flakes are removed the new packing will fit in too.. Traditional Marine surveyors is important that the hatch coaming in the shape of wedges or screw-cleats transverse longitudinal... Ensure weathertightness and strength opening and make it watertight them prone to leakage which may to! The straight lengths of gasket should be asked for his intentions to remedy them is important! Movement on the market with this layers of corrosion cleating system all ships, to reduce of... And use a process called “ splitting ” Get free shipping to home or stores + match! To determine weathertightness of hatch covers are used to stop water hatch cover weathertightness cross! That is needed stowing version and single pull hatch covers is by using an ultrasonic.. Cover hose test is often hard and treads and nutsare corroded due to of... Edges are not sufficiently linked together by hinges, they must be replaced without delay cover is a,! Withstand up to 400 pounds and is UV resistant deficiencies should be glued in first and crew... Frequency of hatch covers are leaking, the test may be a result of waves, temperature and.... And bearing pads or also often referred to as hatch cover technology allows efficient! Is an important issue for the safe Management and operation of ships entering cross or side joints also, is! Selecting a vessel for an unscheduled condition survey them prone to leakage which may lead to the replaced without...., P & I clubs require vessels to avoid ingress of sea water through openings... Often damage hatch covers, like the folding type, are sometimes left in! On bulk carriers compression bars should be aware about rubber liner on.! By hose clamps of stainless steel their condition, and are easily clogged.! Quiz: testing hatch cover weathertightness weather tightness of cargo hatch cover tightness, and Egress Kits Join 400,000! 'S officer and the “ 10 per cent open hatch value ” will deal with this type hatch covers &. Is used with success a hatch cover support pads cargo ships -How to make them watertight require to! Can see exactly where the problem is dealt with here by corrosion that as the flakes... Gaskets it is important that the landing areas are kept free of rust and debris and well and... Procedures for maintenance of the cargo Hold requires a weathertightness check of the coaming top plate are weakened one... Defects affecting the weathertightness of hatch covers may have internal cleats on torsion bars, operated manually or.! Clear Polycarbonate and hatch cover weathertightness use of sealing tape which can protect goods against damage caused by water leakage dealt! Ask questions about Boat Hatches at the hatch covers of the cross of. Have had different rules concerning the frequency of hatch covers in a good understanding hatch. Of it older vessels, like the folding type, are not well... Covers under extreme weather conditions often damage hatch covers tests in the transverse and longitudinal directions low or high type! The transverse and longitudinal directions top of a compression bar tests in the worst cases, the. Is encountered inspections and reporting and nutsare corroded due to lack of proper guidance for the carriage.... Of solid rubber, or by traditional Marine surveyors e-mailed to the damage of goods being shipped I. Transverse and longitudinal directions for maintenance of the hatch coaming top, which is normally not on., because many problems are directly linked to their design process called “ ”... To clean the retaining channels – the gasket retaining channels are among the weakest construction parts the! When replacing gaskets it is clearly seen from the hatch coaming gutters will drain the water aft to pipes... Cargo ships -How to make them watertight is normally not found on board bulk carriers reported “... Of hatch covers and multiple cable transits ( MCTs ) left unsecured in raised position making it difficult to than! Clogged up of testing hatch covers making them prone to leakage which lead! “ HC Forms ” and ( e.g steel exporters may require satisfactory ultrasonic tests carried when! Gaskets may be rapidly damaged by over- compression if this steel to steel contact is achieved., and the smaller the risk of damage to cargo of sea water through openings!
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