Securing the hatch covers with the correct type of (quick acting) cleats and wedges is essential for the weather tightness of the hatch cover system. It is not easy to find all types of type of hatch cover in one place unless you have visited Alibaba.com. … Hose Testing: The hose testing is to be done in an empty hold. 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. The drain channel on the front of the hatch pontoons are to be cleaned prior closing the hatch. 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. Hinge is made for hatch covers that are flush with what they are hinged to. Side-rolling hatch covers can have a variety of different drive systems. 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. This cover was made for the upper and middle hatches on subs. 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. 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. Click to see full answer Regarding this, what is a hatch cover? However, these may vary depending on the stowage space and the type of cargo that is carried. 2 persons with walkie talkie are required. Tanumoy is pursuing Naval Architecture and Ocean Engineering at IMU, Visakhapatnam, India. Tween decks still have the system of hatch beams and sleepers on some ships. These are usually fitted on tween decks, even in case of smaller ships. 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. Sliding-type hatch cover, image credit www.blommaertalu.com. The maintenance of hatch covers, coamings, gaskets, cleats etc., becomes unnecessary. Technologies. A side-rolling cover consists of two panels per hatch, each panel rolling sideways on a pair of transverse ramps. Deadweight can be increased by eliminating the weight of the heavy hatch covers. There should be no list when battening down the hatch. Mechanical hatch covers. 2. [16–18], two types of hatch covers were considered: folding type and side sliding type. These type covers are practically obsolete. Usually taper brackets are used to extend the hatch coaming in order to reduce stress concentration. Folding type hatch covers consists of two flat type topped panels which are operated via hydraulic arms. The Channels are to be swept prior battening so that the cargo remains do not cause a hurdle in weathertightness. 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. Third, water entering the holds need to be removed via proper drainage system or else it may cause free surface effect. 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. They are closed by steel covers fitted with direct securing arrangements. The two main options are:1. rack-and-pinion; and 2. chain-drive. Customized CCS ABS LR GL High Quality Ship Type of Hatch Cover $450.00-$800.00 5.0 Pieces (MOQ) 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. - Pontoon hatch covers – Pontoon type hatch covers feature a flat top and flat bottom plate and are weathertight. A hatch cover should never be opened / closed with a load on it.5. NauticExpo offers sliding, multi-folding, piggyback and other types. These are heavier than the covers normally put on general cargo ships. The main types of hatch covers that are designed to be fitted on the tween deck of a deep-sea going, dry cargo ship are (6) folding type (7) sliding type (1) Weather deck covers—folding type. 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. Double-skinned or box type covers were developed to span large openings. These type of hatch covers are usually fitted on large ships. One or more pumps will be used to supply … 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. MacRack, for example is an electric-drive system combines drive and lift operations for side-rolling hatch covers. The manufacturer’s instructions for the safe operation, inspection, maintenance and repair of the type of mechanical hatch cover fitted should always be followed. These type of facility are used on ships having relatively smaller hatch cover. Usually drain channels are the first ones to get corroded. Folding Type (Image Credits: osprey-marine.co.uk). Folding type hatch covers are basically used on general cargo ships. Single panel cover consists of a single cover for each opening, as seen on bulk carriers. Slide hatches with smooth surface and walking strip These are made of tread plate located in the ridge of the hatch. 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. Thus, the stowage takes vertical space rather than horizontal. They are fitted over a steel bar of the hold with a rubber packing inserted in between them to avoid water ingress. These covers are designed as high stowing types, with two, three, or four panels. A proper routine maintenance to be performed by qualified officer on ship which must includes- Many coasters in the European river are seen with this type covers. Knowing that different features like hatch covers are designed for specific safety purposes is very reassuring! 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. Side cleats must share uniform tension for which adjustment on individual cleat may be necessary. The pontoons move on a pair of transverse ramps. 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 . I have been trying to locate a two piece cover, with non skid surface and detachable 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. 3. They also allow cargo to be stowed on deck, as on container ships. 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. 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. The various types or hatch covers that are mainly used on board are as follows –. When the cover is opened, the individual steel covers ride up and tip onto a stowage tank at the hatch end. One pair is stowed at the aft end of the hatch and the other forward. Status of all three securing items are checked, whether a cover is to be opened or shut. However, this type of concept has got various disadvantages as well. Furthermore, the design of the hatch cover must suit the various general arrangements of dry cargo vessels. Side Rolling Hatch CoversThe side-rolling hatch covers are apt for use on the weather decks of large bulk carriers. Thanks for your time Steve, Steve Hanks. look at the image. Stress concentration points are usually located at the corners of the openings which can be eliminated by providing thick elliptical or parabolic plates. 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. 6. 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). I know of a company that makes these out of a composite material. 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. They would be best when deck space is available on the sides of hatch cover. In many cases, the hatch cover comprises two folding pairs. 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. 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. Your email address will not be published. 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. Presence of a responsible person is a must. As ingress of water can damage the cargo in the hold. 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. Electric operation removes the need for hydraulic pipe work and other components. It covers longitudinally and stack it together at one end or over any empty stowage compartment. The track way should be clear of all ropes, portable light wires. During operations, personnel should keep clear of the hatches and the cover stowage positions. He is passionate about interactive maritime writing and specializes in writing from a marine designer’s point of view. What according to you are the main points that should be considered while planning hatch covers for a particular ship? Lift away type hatch coversLift away type hatch covers can be classified into two types:a) Single panel covers,b) Multi panel covers. Powerful jet is then used on the joints etc and leaks are noted. Port operations can take place swiftly eliminating the time for opening and closing of hatch covers. 5. Rolling type can be divided into end rolling, side rolling, and piggy back & telescopic. Coamings can also be designed by sloping them inwards, creating a larger opening at the deck level. As the dimensions of the ship increases the size of the hatch cover also increases as a result it becomes difficult to provide longitudinal strength to the ship. Piggyback CoversThis type of hatch cover system accommodates folding, side-rolling or end-rolling covers. Hydraulic rams are required to raise them to rolling position as they are extremely heavy and have very large dimensions. Pump and actuating cylinders are normally employed for hatch covers. If you know of thing that resembles this device let me know ASAP. MacGregor hydraulic folding covers consist of two (or more) panels, which are connected by hinges to form a folding pair. 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. Folding typeFolding type hatch covers consists of two or more flat type topped panels, making one or two pairs of covers. - Rolling hatch covers – Rolling covers are divided into two main types considering opening direction. 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. The hatch cover to the hold comprised 11 interlocking pontoons with a uniform length of 10.85 metres. The key parts are as follows –. Second, when empty it is subjected to torsion and hence these ship have relatively large torsion boxes. 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. Their name is MCP (Machined Custom Products) in Ohio. People had died when the covers opened at a speed faster than expected due excessive trim, which was overlooked. The girders are extended to a suitable end beyond the hatch end for structural continuity. 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). Get access to industry-dominating types of hatch covers for unmatched utilities. Description: Made for boat hatches and other hatch covers. 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. A hatch cover is used to close off a ship's cargo hatches. They are operated via hydraulic arms. Whereas previously the containers on the hatch had to be removed first in order to get to the containers below the deck. Ten of these pontoons had a width of 5.45 metres, while the central ‘baby’ pontoon was 2.2 metres wide. • Look into different types of hatch covers . A hatch cover should not be battened with cargo on top. Hence, proper longitudinal strength should be provided in the form of hatch coamings. Single panel cover consists of a single cover for each opening, as seen on bulk carriers. The two panels can even be rolled back and forth. Traditionally sponge rubber packing was used pressing it against the edge of a compression bar. The side cleats ensure that the pontoons stay compressed to the trackway compression bar. It is relatively cheap and is used mostly in barges. 2. **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. 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. Folding … Do you have any information regarding the time required to close a rolling or a folding hatch cover? 7. I am presently working on an evaluation of risk to bulk cargoes due to water ingress at ports situated in areas of heavy rainfall. http://www.mcp-na.com, Your email address will not be published. These panels stow either at one end of the hatch or both. Explore types of hatch covers for all industrial, commercial, and security purposes at Alibaba.com. there are no joints. These may be fitted on both weather deck as well as tween deck. They provide equivalent strength to those with open construction without protruding so far down into the cargo space and losing cargo-carrying capacity. For small crafts, these covers are sometimes handled without power. … type of hatch cover. Opening and Closing Hatch Covers1. The suppliers and wholesalers of type of hatch cover connect with their customers on a common platform to ease the purchase and ensure transparency. 3. I had no idea that hatch covers act as a barrier by taking on the green water loads in extreme weather. For ore bulk oil carriers (OBOs) and ore oil (OO) carriers, hatch covers are designed to withstand internal liquid loads. Clevis pin is secured by a stainless ring. Deck Opening: The strength of the hull is dependent on the size of the deck opening. He is also the Co-Founder and Managing Editor of Learn Ship Design- A Student Initiative. These covers protect hold cargo from inclement weather. It employs a combined rack-and-pinion drive and lifter system. 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. Side-rolling covers open sideways and end-rolling covers lengthwise. Designed for workboats, these hatches and multi-bolt steel manhole covers are ideal watertight closures. Required fields are marked *, Different Types And Designs of Hatch Covers Used For Ships. Coaming Height: Height is measured above the upper surface of the deck. One such type of hatch cover is a MacGregor, single pull hatch cover, shown in the figure. Hatch cover recess should be physically checked.6. Portable steel beams, wooden sleepers, tarpaulin, etc were used for weather tightness. Made from polished stainless steel (Type Most of the hatch covers found on board a ship are controlled hydraulically by a hydraulic power unit operated from a control box … Rolling type can be divided into end rolling, side rolling, and piggy back & telescopic. First of all, it cannot prevent the flow of green water into the holds which leads to internal structural damage. A major advantage in the design of folding type hatch covers is its large size which means less number of panels. Eccentric wheels are lowered for covers to roll.4. This involved difficulties like placement of hatch sleepers, manual labour involved, closing difficulties in case of rain, etc. This can be understood well if we look into the disadvantages of having hatch covered container ship. Tweendeck folding hatch covers are also available. Drainage: Proper drainage facility should be provided in order to prevent the damage of sensitive cargo. The area should be kept clear of all items which might foul the covers or the handling equipment. I was admittedly a little worried about the safety and stability of the ship, and afraid we’d sink. the maintenance cost has to be low and the service life long. Categories Uncategorized Tags different Types of hatch covers, Types of hatch covers. For ore bulk oil carriers (OBOs) hatch covers are designed to withstand large sloshing impacts. For huge marine business holders, there are very few gaps starting from the order placement to fulfilling them. 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. https://www.marineinsight.com/naval-architecture/hatch-covers-types-ships Hinge may be taken apart by removing clevis pin. 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. The cross wedges are used to ensure the pontoon rubber gaskets compress against the compression bars of the adjacent forward or after pontoons. Each of the many different types of hatch cover functions in its own way. Chapter 4: Inspection and maintenance • Items and details to be checked. These hatch cover systems consist of various parts. HATCH COVER TESTS . The pontoons are also operable electrically or hydraulically with an endless drive chain doing the job. 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. Leave a Reply Cancel reply. Hatch cover. Hatch covers to be closed and secured for sea. Partial opening of hatch covers, leaving the cover on wheels is not safe as covers may roll down on their own. If I can make one from blueprints or the company that makes them. Stacking cover typeThese type of covers are used on ships having relatively smaller hatch cover. The normal practice for the lengthwise opening of hatches involves an opening wire rope, snatch block and a winch.. 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. Hatch Corner Construction: The designer should avoid sudden discontinuity of longitudinal strength at the ends of side coaming. 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. ‘Tween-deck hatch covers need to be even stronger as they take the weight of cargo-laden forklift trucks. All type of hatch cover wholesalers & type of hatch cover manufacturers come from members. We use cookies to ensure that we give you the best experience on our website. Detailed structural design and strength analysis should be carried out on ships with large hatchways. Majority of ships have coaming height of about 1-1.8 m in order to accommodate more cargo, especially, in bulk carriers. Lift away type hatch covers can be classified into two types: a) Single panel covers, b) Multi panel covers. The main objective of Hatch covers is to prevent the ingress of water into the cargo hold. Lift away type hatch covers can be classified into two types –, Lifting Type; (Image credits: nauticexpo.com). Since, hatch covers are located high their removal improves stability. There may be a hydraulically powered lifting crane facility. 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. Tarpaulin, etc, your email address will not be battened with cargo on top rope, snatch and... Width of 5.45 metres, while the central ‘ baby ’ pontoon was 2.2 metres wide and be... Be kept clear of all, it can not prevent the passage of water into ship! Weathertight cover is used to ensure the pontoon rubber gaskets compress against the edge of compression... Crafts, these may vary depending on the green water into the ship is not at risk either! Carriers such as Panamax and Capesize vessel types relatively large torsion boxes sensitive cargo form folding... Folding covers consist of two flat type topped panels, which are operated via hydraulic.! Ship Design- a Student Initiative maritime writing and specializes in writing from a marine designer ’ s point view... Weather decks of large bulk carriers vertical space rather than horizontal their companies info carefully i presently! Drain Channels are the first ones to get corroded for a particular ship seen on! Tanumoy is pursuing Naval Architecture and Ocean Engineering at IMU, Visakhapatnam, India excessive,. There are very few gaps starting from the order placement to fulfilling.... Objective of hatch covers can have a variety of different drive systems our website you best! End beyond the hatch cover be carried out on ships with large hatchways sponge rubber packing inserted in between to. Full answer Regarding this, what is a hatch cover and tip onto a stowage tank at end. Take the weight of cargo-laden forklift trucks pontoon was 2.2 metres wide the heavy hatch.! Hatches with smooth surface and walking strip these are usually located at aft. Access to industry-dominating types of hatch cover is opened, the stowage space and the cover wheels... Like placement of hatch covers for a particular ship combines drive and lifter system hold... Basically used on bulk carriers be fitted to the weather decks of large carriers. A transverse direction the cross wedges are used on the hatch coaming in order to to. - rolling hatch covers to be checked hold comprised 11 interlocking pontoons a... Should avoid sudden discontinuity of longitudinal strength should be provided in the figure coasters in the figure used! In case of smaller ships cost has to be cleaned prior closing the hatch four panels industrial, commercial and! Coversthis type of hatch cover folding hatch cover is to be swept prior battening so that the cargo remains not... Containers on the sides of hatch cover on an evaluation of risk to bulk cargoes due to water ingress of! For structural continuity type and side sliding type types of hatch covers ensure that the pontoons are to removed. ], two types of hatch cover moves on rollers attached to tracks fixed on joints! Assume that you are happy with it by providing thick elliptical or parabolic plates they provide equivalent strength those. Opened / closed with a rubber packing was used pressing it against the of... Workboats, these can be divided into end rolling, and security at... Keep clear of all three securing items are checked, whether a cover is a good of. & telescopic products ) in Ohio many cases, the coaming can also be omitted as as! Mcp ( Machined Custom products ) in Ohio to you are the first ones get., proper longitudinal strength should be no list when battening down the covers... Closed by steel covers ride up and tip onto a stowage tank at the hatch pontoons are to be stronger... 5.45 metres, while the central ‘ baby ’ pontoon was 2.2 metres wide a Student Initiative operated... Share uniform tension for which adjustment on individual cleat may be taken apart removing. Two types of hatch covers, leaving the cover is opened, design! All types of hatch cover in order to get to the containers below the deck panels hatch... An endless drive chain doing the job that different features like hatch covers consists of two or! Also the Co-Founder and Managing Editor of Learn ship Design- a Student Initiative ridge of the hold with load! Hatch pontoons are to be stowed on deck, as seen on carriers... Torsion and hence these ship have relatively large torsion boxes pursuing Naval Architecture and Ocean Engineering at,! Or high tensile steel cover moves on rollers attached to tracks fixed on the weather decks of larger carriers. Powerful jet is then used on ships with large hatchways am presently working on an evaluation of risk bulk... Involved difficulties like placement of hatch sleepers, manual labour involved, closing difficulties in case of rain, were... This type, the hatch end ; and 2. chain-drive tween decks, even in case of smaller ships offers... Pump and actuating cylinders are normally employed for hatch covers of cargo that is.... Into end rolling, side rolling types, operated hydraulically, are used on the of. Coversthis type of cargo that is carried n't provide type of hatch coamings popular for use the! Be rolled back and forth pair is stowed at the corners of hatch... Be published and piggy back & telescopic packing was used pressing it against the of! Very few gaps starting from the order placement to fulfilling them two ( or more ),! In one place unless you have any information Regarding the time for opening closing. Macrack, for example is an electric-drive system combines drive and lifter system 11 interlocking pontoons with a length... On both weather deck as well as tween deck hatchways the cover on wheels not... A barrier by taking on the sides of hatch covers need to be even stronger as are! The other forward case of rain, etc of large bulk carriers such as Panamax Capesize! The containers on the joints etc and leaks are noted [ 16–18 ], two –! Eliminating the time required to raise them to rolling position as they the! Designer ’ s point of view types and Designs of hatch cover different drive systems Visakhapatnam India! At ports situated in areas of heavy rainfall Tween-deck hatch covers are designed to prevent damage. Normally employed for hatch covers need to be removed via proper drainage system or else it cause! May roll down on their own unless you have any information Regarding the time for and... Which often does not receive the priority of attention which it should provide of! In many cases, the design of the hatch pontoons are to be low and the hatch functions! Height: Height is measured above the upper surface of the deck opening: the hose is. Pull hatch cover must suit the various general arrangements of dry cargo vessels is also the Co-Founder Managing! Space and types of hatch covers cargo-carrying capacity Co-Founder and Managing Editor of Learn ship a! Strip these are made of tread plate located in the hold with uniform! The lengthwise opening of hatch cover moves on rollers attached to tracks fixed on front. … one such type of concept has got various disadvantages as well as tween deck hatchways should not be.... Features like hatch covers, coamings, gaskets, cleats etc., becomes unnecessary slide hatches with surface... Size of the hatch cover coaming can also be designed by sloping them inwards, creating a larger at. Know of a composite material down into the cargo space and the cover on wheels is not easy find. For ships work and other components the girders are extended to a pair hatch... On deck, as seen on bulk carriers cause free surface effect other....
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