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H2 Folding - 8 Pages

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Catalogue excerpts

Weatherdeck Hatch Covers Hydraulic Folding Types

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Weatherdeck Hatch Covers Hydraulic Folding Types The weatherdeck hatch cover on a dry cargo ship has the following basic functions: in the open position it provides access to the hold for loading and discharging cargo, and in the closed position it seals the hatchway in a weathertight manner for transit in heavy seas. With the progress of containerisation, the ability to carry substantial deck loads has emerged as a new, essential function for weather deck hatch covers. It goes without saying that the hatch cover must be safe to operate, and it must be cost effective, both as an initial investment...

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Folding hatch covers in operation Operating requirements • Necessary power Location of hydraulic power pack • Running the hydraulic pipelines • Operating forces • Arrangement of securing and cleating Main types of hatch covers State-of-the-art hatch covers can be divided into three basic types: lift-away covers on container carriers, side-rolling covers on bulk carriers, and folding covers on general cargo ships. However, folding covers can also be installed on geared bulk carriers and lift-away panels on general cargo ships. If stowage space is not available, rolling covers (mostly in the longitudinal...

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Two-panel folding hatch cover Mul ti-fol cling hatch cover Special adjustable and replaceable stoppers can be provided In order to help Installation and make wear and tear repairs easier. Operating arrangements The name 'hydraulic folding cover' refers, In MacGregor product range, to a cover consisting of two panels which are connected by hinges to form a folding pair. In many cases the cover consists of two folding pairs. One pair Is stowed forward. The folding pair Is operated by hydraulic cylinders acting directly on the end hinge arms which are connected at stools on the deck. When the cylinders push...

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Raised socket Raised socket Bell crank located at transversal coaming It Is, of course, possible to combine the two systems, i.e. external cylinders on the leading pair and Internal cylinders on the trailing pairs. Another opportunity to Increase the length of the hatch Is to insert rolling panels between the folding pairs. They can be towed by the folding cover, thus opening the desired section of the hatch for cargo working. They can also be designed for lifting ashore by container cranes. Steel structure The steel structure of a hatch cover is a compromise between optimal stiffness and weight....

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Battening, sealing and bearing pad solutions compression bar must be in the correct position in relation to the seal. The above Implies that the compression of the seal shall be within the specified limits and the seal must be intact. The position of the compression bar changes while the coaming sides are flexing, which also causes dynamic wear and tear on the seal. Hogging/sagging of the hull and warping of the coaming plane at sea causes an additional challenge variation of the deflection at the cross- We have dealt with the Issues relating to flexible deformations In the hull and the relative...

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The MacGregor standard pump unit operating systems. Also, operational requirements, e.g. smooth accelerating/ braking of the cover, dictate that the use of conventional components does not result in the best hydraulic system. The effects of weather on hydraulic components appear to be mainly corrosion on the cylinder piston rods and seizing of bearings. We have dealt with these piston rod problems by using stainless material on the whole rods, or in way of the top seal and wiper ring on big cylinders. For additional protection of the piston rod surface, the space between the top seal and wiper...

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Lloyd's Register Quality Assurance certifies that the Quality Management System For Cargotec Corporation's business area Cargotec improves the efficiency of cargo flows on land and at sea - wherever cargo is on the move, Cargotec's daughter brands, Hiab, Kaimar and MacGregor are recognised leaders in cargo and load handling solutions around the world, MacGregor is the global market-leading brand in marine cargo handling and offshore load-handling solutions. Customer-driven MacGregor engineering and service solutions for the maritime transportation industry, and the offshore load-handling and naval logistics...

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