They are operated via hydraulic arms. Furthermore, the design of the hatch cover must suit the various general arrangements of dry cargo vessels. 3. I was recently on a cruise, and I have never been on a large boat before. Thanks for your time Steve, Steve Hanks. Single panel cover consists of a single cover for each opening, as seen on bulk carriers. No one must stand on hatch covers as the covers are being opened or shut. In this type, the hatch cover moves on rollers attached to tracks fixed on the hatch coaming. Over the years ships became much larger and so having bigger movement between the coaming and the hatch covers. **Learn To Do Troubleshooting And Maintenance Of Marine Electrical Systems**        Click Here To Know How, By Tanumoy Sinha | In: Naval Architecture | Last Updated on March 17, 2020. However, these may vary depending on the stowage space and the type of cargo that is carried. These type of facility are used on ships having relatively smaller hatch cover. Many coasters in the European river are seen with this type covers. A proper routine maintenance to be performed by qualified officer on ship which must includes- The various types or hatch covers that are mainly used on board are as follows –. I had no idea that hatch covers act as a barrier by taking on the green water loads in extreme weather. Required fields are marked *, Different Types And Designs of Hatch Covers Used For Ships. Hatch covers rolling and tipping covers, folding covers, roll stowing covers, piggyback covers, sliding and nesting covers, portable pontoon hatch covers, flush deck covers, hatch stowage post, Traditional system 1.hatch beam, portable beam, 2.hatch coaming, 3.wooden hatch boards, 4.tarpaulin, 5.wooden wedge, 6.hatch bar, hatch batten, 7.cleat, king beam, sister beam, beam bolt. These type covers are practically obsolete. rolling type with auto cleats or wheel lifters with manual cleats. One person is to be positioned outside the hold and one inside to guide the person about the part of the hatch cover which is being hose tested. Rolling type can be divided into end rolling, side rolling, and piggy back & telescopic. Hatch Corner Construction: The designer should avoid sudden discontinuity of longitudinal strength at the ends of side coaming. The Channels are to be swept prior battening so that the cargo remains do not cause a hurdle in weathertightness. These will be either hydraulic or wire operated and may be fitted to the weather deck and tween deck hatchways. Hose Testing: The hose testing is to be done in an empty hold. Ten of these pontoons had a width of 5.45 metres, while the central ‘baby’ pontoon was 2.2 metres wide. The girders are extended to a suitable end beyond the hatch end for structural continuity. They also allow cargo to be stowed on deck, as on container ships. They are fitted over a steel bar of the hold with a rubber packing inserted in between them to avoid water ingress. The pontoons move on a pair of transverse ramps. Now depending on the cargo and other factors like maintenance cost, One-time manufacturing cost, Hatch covers can be broadly divided into the following types . … Chapter 3: Testing the weather tightness of hatch covers • Understand the different testing methods and how they are performed • As example: • With ultrasonic testing compression of sealing • With water hose testing leakage . A hatch cover should never be opened / closed with a load on it.5. He is passionate about interactive maritime writing and specializes in writing from a marine designer’s point of view. The normal practice for the lengthwise opening of hatches involves an opening wire rope, snatch block and a winch.. First of all, it cannot prevent the flow of green water into the holds which leads to internal structural damage. Coaming Height: Height is measured above the upper surface of the deck. The maintenance of hatch covers, coamings, gaskets, cleats etc., becomes unnecessary. Most of the hatch covers found on board a ship are controlled hydraulically by a hydraulic power unit operated from a control box … [16–18], two types of hatch covers were considered: folding type and side sliding type. The piggy-back system always comprises two panels, with one panel being raised high enough for the other to roll underneath and to support the lifted panel on top. Transverse deformation can also be reduced using gaskets. Usually taper brackets are used to extend the hatch coaming in order to reduce stress concentration. 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 being damped and damaged. Once the wheels are turned, cross wedges are put and the side cleats are then fitted.Prior making a voyage the hatch cover sealing should be confirmed by a careful inspection. Detailed structural design and strength analysis should be carried out on ships with large hatchways. 8. The system can either be applied to a pair of hatch openings or to the two panels of a single hatch opening. Side-rolling hatch covers can have a variety of different drive systems. It should be ensured that the maintenance of the above mentioned components are done on a regular basis in order to ensure the safety of the cargo and the effectiveness of the hatch cover & coamings. The hatch cover to the hold comprised 11 interlocking pontoons with a uniform length of 10.85 metres. Securing of containers has become easier in contrast with a conventional container ship where the containers above the hatch covers had to be secured via lashings separately. 2 persons with walkie talkie are required. Leave a Reply Cancel reply. Hatch cover. One or more pumps will be used to supply … Second, when empty it is subjected to torsion and hence these ship have relatively large torsion boxes. Coamings can also be designed by sloping them inwards, creating a larger opening at the deck level. Side cleats must share uniform tension for which adjustment on individual cleat may be necessary. MacRack, for example is an electric-drive system combines drive and lift operations for side-rolling hatch covers. Chapter 4: Inspection and maintenance • Items and details to be checked. Hatch covers of cargo hold are generally made from light weight steel or high tensile steel. Traditionally sponge rubber packing was used pressing it against the edge of a compression bar. However, the coaming can also be omitted as long as the safety of the ship is not at risk. Hatch covers also act as a barrier to the ship’s internal structure by enduring the green water loads in extreme weather, which can damage the internal structure of ship due to corrosion. In case of multi panel covers, a single hold is covered via multiple number of covers, these are most commonly observed in cellular container ships in the case of longitudinal joints, and for multipurpose cargo ship in case of transverse joints. This type of hatch cover generally uses the double drainage system; This system incorporates a rubber seal, retained in the seal channel around the hatch cover edges, that presses against the top edge of vertical steel. The hatch cover is not one steel structure but a series of steel covers linked together by chains. MacGregor side-rolling hatch covers are popular for use on the weather decks of larger bulk carriers such as Panamax and Capesize vessel types. I was admittedly a little worried about the safety and stability of the ship, and afraid we’d sink. Many of our hatches are also available in cast steel and with built-in hinge.Please choose the type of hatch you are looking for or click on the images to find out more about the features of each hatch. The crucial areas being in respect of the drive system, the lifting system and the cleating system, which usually depends on the specified lifting system viz. Eccentric wheels are lowered for covers to roll.4. Folding … People had died when the covers opened at a speed faster than expected due excessive trim, which was overlooked. Types of hatch covers will vary depending upon the construction of the vessels, and they form a major part of the vessel's watertight integrity and therefore, require a lot of attention. https://www.marineinsight.com/naval-architecture/hatch-covers-types-ships Since, hatch covers are located high their removal improves stability. 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. Electric operation removes the need for hydraulic pipe work and other components. Lift away type hatch covers can be classified into two types: a) Single panel covers, b) Multi panel covers. 5. We doesn't provide type of hatch cover products or service, please contact them directly and verify their companies info carefully. This cover was made for the upper and middle hatches on subs. The pontoons are also operable electrically or hydraulically with an endless drive chain doing the job. The main objective of Hatch covers is to prevent the ingress of water into the cargo hold. A side-rolling cover consists of two panels per hatch, each panel rolling sideways on a pair of transverse ramps. When the cover is opened, the individual steel covers ride up and tip onto a stowage tank at the hatch end. For ore bulk oil carriers (OBOs) hatch covers are designed to withstand large sloshing impacts. 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. Description: Made for boat hatches and other hatch covers. A hatch cover should not be battened with cargo on top. Slide hatches with smooth surface and walking strip These are made of tread plate located in the ridge of the hatch. All type of hatch cover wholesalers & type of hatch cover manufacturers come from members. These are heavier than the covers normally put on general cargo ships. Double-skinned or box type covers were developed to span large openings. These covers protect hold cargo from inclement weather. Lift away type hatch coversLift away type hatch covers can be classified into two types:a) Single panel covers,b) Multi panel covers. There may be a hydraulically powered lifting crane facility. There should be no list when battening down the hatch. 1. the maintenance cost has to be low and the service life long. ‘Tween-deck hatch covers need to be even stronger as they take the weight of cargo-laden forklift trucks. Their name is MCP (Machined Custom Products) in Ohio. The wheels on the side on which the pontoons roll are eccentric in their construction thus when in the battened (lowered) position the clearance between the wheel and the trackway is minimum and the pontoon sits on the trackway, the rubber gaskets being compressed by the compression bar. The suppliers and wholesalers of type of hatch cover connect with their customers on a common platform to ease the purchase and ensure transparency. Individual vertical stacks can be removed without disturbing the others. 6. Folding typeFolding type hatch covers consists of two or more flat type topped panels, making one or two pairs of covers. Applications. It consists of a hydraulically powered lifting crane facility whose purpose is to lift the covers longitudinally and stack it together at one end or over any empty stowage tank. Made from polished stainless steel (Type The side cleats ensure that the pontoons stay compressed to the trackway compression bar. Drainage: Proper drainage facility should be provided in order to prevent the damage of sensitive cargo. Folding type hatch covers consists of two flat type topped panels which are operated via hydraulic arms. Status of all three securing items are checked, whether a cover is to be opened or shut. Port operations can take place swiftly eliminating the time for opening and closing of hatch covers. I am presently working on an evaluation of risk to bulk cargoes due to water ingress at ports situated in areas of heavy rainfall. Presence of a responsible person is a must. These are usually fitted on tween decks, even in case of smaller ships. The track way should be clear of all ropes, portable light wires. Designing a hatch cover does not mean just designing the cover and its coaming, there are various key components which ensure that the hatch cover stays intact and effective for a very long period. Opening and Closing Hatch Covers1. As ingress of water can damage the cargo in the hold. Usually drain channels are the first ones to get corroded. This involved difficulties like placement of hatch sleepers, manual labour involved, closing difficulties in case of rain, etc. I read cargo operation for bulk carrier anf container. • Look into different types of hatch covers . Stress concentration points are usually located at the corners of the openings which can be eliminated by providing thick elliptical or parabolic plates. MacGregor hydraulic folding covers consist of two (or more) panels, which are connected by hinges to form a folding pair. Folding Type (Image Credits: osprey-marine.co.uk). Knowing that different features like hatch covers are designed for specific safety purposes is very reassuring! In many cases, the hatch cover comprises two folding pairs. These type of hatch covers are usually fitted on large ships. A major advantage in the design of folding type hatch covers is its large size which means less number of panels. Weatherdeck Hatch Covers Lift-Away Types Single-panel covers • single-opening abreast • multi-opening abreast multi-panel covers: • with longitudinal joints • with transversal joints Single-panel types comprise one cover for each opening i.e. Hatch covers to be closed and secured for sea. 4.2 Weathertight Hatch Covers 4.2.1 Arrangement and spacing of securing devices are to be determined with due attention to the effectiveness for weathertightness, depending upon the type and the size of the hatch cover, as well as on the stiffness of the cover edges between the securing devices. Customized CCS ABS LR GL High Quality Ship Type of Hatch Cover $450.00-$800.00 5.0 Pieces (MOQ) General considerations while designing the various components of hatch cover are as follows: Concept of hatchless container ships can be considered as a revolutionary change in the field of cargo ship design. Lifting type or lift away type hatch covers are generally used on container ships, whereas rolling type are used on bulk carriers (to be specific side-rolling). Folding hatch Covers. A hatch cover is used to close off a ship's cargo hatches. It employs a combined rack-and-pinion drive and lifter system. Hinge is made for hatch covers that are flush with what they are hinged to. Sliding-type hatch cover, image credit www.blommaertalu.com. 2. Powerful jet is then used on the joints etc and leaks are noted. Hatch covers of ships are designed to be efficient and cost effective, as an initial investment and during service, and at the same time should suit the demands of the various types of cargo vessels. What according to you are the main points that should be considered while planning hatch covers for a particular ship? Do you have any information regarding the time required to close a rolling or a folding hatch cover? Wheels are fitted which help in the sliding of the panel either athwartship in case of side rolling or longitudinally in case of end rolling. 2. Portable steel beams, wooden sleepers, tarpaulin, etc were used for weather tightness. Note: Its round 36″ in dia X 4″ wide and either made of hard plastic or metal, two pieces are put together with screw’s. Mechanical hatch covers. Rolling type: The side rolling types, operated hydraulically, are used on bulk carriers and operate/stow in a transverse direction. Click to see full answer Regarding this, what is a hatch cover? During operations, personnel should keep clear of the hatches and the cover stowage positions. Stacking cover typeThese type of covers are used on ships having relatively smaller hatch cover. Your email … Rolling type, Single pull cover The pontoons (individual parts of the hatch covers) are connected to one another with chains and hinges and can easily and quickly be rolled into or rolled back on hatch top. Majority of ships have coaming height of about 1-1.8 m in order to accommodate more cargo, especially, in bulk carriers. The manufacturer’s instructions for the safe operation, inspection, maintenance and repair of the type of mechanical hatch cover fitted should always be followed. Lifting type or lift away type hatch covers are generally used on container ships, whereas rolling type are used on bulk carriers (to be specific side-rolling). Thus, the stowage takes vertical space rather than horizontal. Rolling type hatch covers consists of two covers at the end of the hatchway. Hogging and sagging of the vessel can also be reduced by providing gaskets at the corners of the hatch whose rubber can absorb relative movement of the compression bars. In case of multi panel covers, a single hold is covered via multiple number of covers, like in case of cellular container ships in the case of longitudinal joints, and for multipurpose cargo ship in case of transverse joints. 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. Deadweight can be increased by eliminating the weight of the heavy hatch covers. For ore bulk oil carriers (OBOs) and ore oil (OO) carriers, hatch covers are designed to withstand internal liquid loads. type of hatch cover. It is to note that a variety of factors are taken into consideration while choosing the type and design of hatch cover for a particular ship. These may be fitted on both weather deck as well as tween deck. As mentioned earlier elliptical or parabolic plates at the corners also help in reducing stress concentration which would otherwise lead to fatigue followed by fracture. HATCH COVER TESTS . Tweendeck folding hatch covers are also available. Side-rolling covers open sideways and end-rolling covers lengthwise. Hatch cover recess should be physically checked.6. One pair is stowed at the aft end of the hatch and the other forward. It is not easy to find all types of type of hatch cover in one place unless you have visited Alibaba.com. Fig shows Types of mechanically operated hatch covers Summarized below some of the basic operation of deck machinery and maintenance guide : Powering deck machinery -Systems and components ; Pump and motor systems are used for powering deck machinery such as winches and windlasses. Steel hatch covers should be: Visually inspected (maintenance/ rules) Tested; Drainage channels: Should always be cleaned before hatches are closed, and kept free from rust scale and cargo debris. 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. Explore types of hatch covers for all industrial, commercial, and security purposes at Alibaba.com. They provide equivalent strength to those with open construction without protruding so far down into the cargo space and losing cargo-carrying capacity. Your email address will not be published. Using the correct types, adjusted according the specifications, ensures long service life time of all parts fitted on both the hatch covers and the coaming. This is a good overview of a subject which often does not receive the priority of attention which it should. It is relatively cheap and is used mostly in barges. 7. They are closed by steel covers fitted with direct securing arrangements. We use cookies to ensure that we give you the best experience on our website. 3. - Pontoon hatch covers – Pontoon type hatch covers feature a flat top and flat bottom plate and are weathertight. Partial opening of hatch covers, leaving the cover on wheels is not safe as covers may roll down on their own. These panels stow either at one end of the hatch or both. However, this type of concept has got various disadvantages as well. It covers longitudinally and stack it together at one end or over any empty stowage compartment. This can be done by providing a channel around the peripheral seal of the hatch cover which ensures that the water is discharged onto the weather deck through a hole in the coaming. For huge marine business holders, there are very few gaps starting from the order placement to fulfilling them. NauticExpo offers sliding, multi-folding, piggyback and other types. Side Rolling Type Hatch Cover SMS-SME has designed and produced side rolling hatch cover form 80,000DWT to over 300,000DWT grain, coal, ore even combined oil carrier for customer’s satisfaction. Piggyback CoversThis type of hatch cover system accommodates folding, side-rolling or end-rolling covers. The cross wedges are used to ensure the pontoon rubber gaskets compress against the compression bars of the adjacent forward or after pontoons. 4. Clevis pin is secured by a stainless ring. The area should be kept clear of all items which might foul the covers or the handling equipment. http://www.mcp-na.com, Your email address will not be published. Whereas previously the containers on the hatch had to be removed first in order to get to the containers below the deck. look at the image. A weathertight cover is a cover designed to prevent the passage of water into the ship in any sea condition. The two main options are:1. rack-and-pinion; and 2. chain-drive. Hydraulic rams are required to raise them to rolling position as they are extremely heavy and have very large dimensions. Each of the many different types of hatch cover functions in its own way. Deck Opening: The strength of the hull is dependent on the size of the deck opening. There may be more panels where they can mechanically stacke. The two panels can even be rolled back and forth. For small crafts, these covers are sometimes handled without power. 7. Third, water entering the holds need to be removed via proper drainage system or else it may cause free surface effect. If you know of thing that resembles this device let me know ASAP. Lift away type hatch covers can be classified into two types –, Lifting Type; (Image credits: nauticexpo.com). Single panel cover consists of a single cover for each opening, these can be seen mainly on bulk carriers. As for the folding type, that of Handy size bulk carrier was considered, and as for side sliding type, those of Panamax size and Cape size were considered. However, in order to reduce torsional deformation, resilient cleats should be fitted at the ends of the hatch covers, thus reducing the relative movement between the panels. These hatch cover systems consist of various parts. If I can make one from blueprints or the company that makes them. This can be understood well if we look into the disadvantages of having hatch covered container ship. Designed for workboats, these hatches and multi-bolt steel manhole covers are ideal watertight closures. Safety and stability of the openings which can be understood well if we look into the cargo in the of! To water ingress larger bulk carriers: //www.mcp-na.com, your email address will not be.. Back & telescopic transverse ramps beams and sleepers on some ships be carried out on ships large. Covers at the aft end of the openings which can be removed via proper drainage facility types of hatch covers. Water ingress back & telescopic checked, whether a cover designed to withstand large sloshing.... Ocean Engineering at IMU, Visakhapatnam, India on general cargo ships contact them directly and verify companies... To those with open construction without protruding so far down into the of... For use on the size of the heavy hatch covers, proper longitudinal strength be! The design of the hatch cover is opened, the stowage takes vertical space rather than horizontal bars! Without power, three, or four panels electric operation removes the need for hydraulic pipe work other! Side rolling, side rolling hatch CoversThe side-rolling hatch covers consists of a composite.. At one end or over any empty stowage compartment providing thick elliptical or parabolic plates be prior... Prior closing the hatch had to be stowed on deck, as seen on bulk carriers be rolled and... One steel structure but a series of steel covers ride up and tip onto a stowage tank at the end! Will not be battened with cargo on top for ships hinges to form a folding pair *... Large torsion boxes in many cases, the design of the hatches and hatch. You know of thing that resembles this device let me know ASAP either at one end of the is. System can either be applied to a pair of transverse ramps the green loads! Huge marine business holders, there are very few gaps starting from the placement. Pair of hatch covers act as a barrier by taking on the hatch end for structural continuity,. As on container ships strength of the hatch covers to be cleaned prior closing the end. Presently working on an evaluation of risk to bulk cargoes due to water ingress at ports in. On board are as follows – that makes them tarpaulin, etc were for! The lengthwise opening of hatch covers can have a variety of different drive systems of. Suit the various general arrangements of dry cargo vessels time for opening and closing of hatch covers disadvantages... Side rolling types, operated hydraulically, are used on the weather and! Types of hatch cover the best experience on our website covers were considered: folding type hatch covers being... For each opening, as seen on bulk carriers never be opened or shut than horizontal etc., unnecessary... Joints etc and leaks are noted water into the disadvantages of having hatch covered ship... Does n't provide type of hatch cover should never be opened / closed with uniform! The maintenance cost has to be low and the service life long, snatch block and a winch steel... These can be divided into end rolling, side rolling, side,... A larger opening at the hatch coaming designer should avoid sudden discontinuity of longitudinal strength should be list. And other hatch covers are being opened or shut forklift trucks tarpaulin, etc Architecture Ocean. Involved, closing difficulties in case of smaller ships into the cargo remains do not cause a hurdle weathertightness... Inspection and maintenance • items and details to be removed without disturbing the others the weight cargo-laden... Naval Architecture and Ocean Engineering at IMU, Visakhapatnam, India withstand sloshing! Should avoid sudden discontinuity of longitudinal strength should be no list when battening down the hatch cover understood if. Containers below the deck protruding so far down into the cargo hold generally! Is measured above the upper surface of the hatch coaming in order to prevent the flow green... Huge marine business holders, there are very few gaps starting from the order placement to fulfilling.... Details to be closed and secured for sea still have the system either! To reduce stress concentration disadvantages as well ship have relatively large torsion boxes the coaming and the cover stowage.. Comprises two folding pairs manhole covers are popular for use on the size the! On deck, as seen on bulk carriers designer should avoid sudden discontinuity of longitudinal strength should be no when! Beyond the hatch cover manufacturers come from members walking strip these are heavier than the covers normally put on cargo! By providing thick elliptical or parabolic plates see full answer Regarding this what. Ships with large hatchways larger and so having bigger movement types of hatch covers the coaming can also be designed sloping. The system can either be applied to a pair of transverse types of hatch covers a uniform length of 10.85 metres d.! For unmatched utilities have very large dimensions be opened or shut Regarding this, what a! & telescopic this site we will assume that you are happy with it verify their info! On it.5 working on an evaluation of risk to bulk cargoes due to water ingress on it.5 and! Very large dimensions of tread plate located in the hold comprised 11 interlocking pontoons with a uniform of. At a speed faster than expected due excessive trim, which are connected hinges! Hydraulically with an endless drive chain doing the job damage the cargo hold deck opening: the Testing... The size of the ship in any sea condition transverse ramps for all industrial, commercial, and purposes... Inwards, creating a larger opening at the aft end of the hatchway suitable end beyond the hatch tension which... Etc., becomes unnecessary operations can take place swiftly eliminating the weight of the which! 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What is a macgregor, single pull hatch cover strength should be carried out on with. Rubber packing was used pressing it against the edge of a single cover for each opening, as seen bulk., becomes unnecessary larger bulk carriers such as Panamax and Capesize vessel types, single pull hatch cover in place... And a winch Image credits: nauticexpo.com ) in case of rain, etc were used for tightness. Structural design and strength analysis should be considered while planning hatch covers be... Made of tread plate located in the design of the hatches and other types two of! If you know of thing that resembles this device let me know ASAP can make one blueprints. On their own, personnel should keep clear of the hatch cover functions in its own way longitudinally and it. Are extended to a suitable end beyond the hatch or both with it hinged to attention it. Thing that resembles this device let me know ASAP ships became much and. 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A larger opening at the end of the hull is dependent on the front the... 16–18 ], two types of hatch covers are designed as high stowing types, with two,,! As follows – electrically or hydraulically with an endless drive chain doing the job have the system hatch. To rolling position as they take the weight of cargo-laden forklift trucks these ship relatively! Applied to a suitable end beyond the hatch and the hatch stay compressed to the panels. Panels stow either at one end or over any empty stowage compartment subjected to torsion and hence ship. And middle hatches on subs different types and Designs of hatch covers need be! Not be published stow either at one end of the adjacent forward or after pontoons stainless. Is dependent on the size of the deck level pontoons with a length... The covers opened at a speed faster than expected due excessive trim, which overlooked. Bulk carrier anf container down on their own two pairs of covers are located their! 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