How many types of hatch covers are there?

Asked by: Jeffrey Shah

Types Of Hatch Covers Rolling type can be divided into end rolling, side rolling, and piggyback & telescopic. Folding type hatch covers are basically used on general cargo ships. However, these may vary depending on the stowage space and the type of cargo that is carried.

What is a sliding type hatch cover?

Tween deck covers—sliding type. The sliding hatch covers for tween decks can be fitted on both general cargo ships and in refrigerated cargo ships, especially where the decks are non-insulated. The panels slide, one under the other, as the hatch opens and they stow slightly sloping.

What type of sealing hatch cover must provide?

While hatch covers must be watertight, they must also provide an efficient and effective time-saving method of access. Hatch covers must be strong to resist the dynamic forces exerted by heavy seas which may break over them. Heavy seas may also cause a vessel to flex, to hog, sagging, to rack and twisting.

What is a ship’s hatch cover?

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. A weathertight cover is a cover designed to prevent the passage of water into the ship in any sea condition.

What is single pull hatch cover?

The single pull hatch cover (Figure 13.12) consists of a number of transverse panels which span the hatchway and are linked together by chains. In the closed position, the panel sides sit firmly on a horizontal steel bar attached to the top of the hatch coaming.

What are the 5 different types of hatch cover?

Types Of Hatch Covers

• Lifting type.
• Rolling type.
• Folding type.
• Sliding type.
• Roll stowing type.

What is piggy back hatch cover?

PIGGY-BACK HATCH COVERS The piggy-back hatch cover system enables every part of the hatch opening to be exposed roll movement of the cover panels. In operation, one panel is horizontally lifted by hydraulic jacks, enabling the other panel to be driven beneath it by built- in electric motors.

What is hydraulic folding hatch cover?

Folding hatch covers are designed to carry various deck cargoes and to form functional cargo areas to facilitate flexible cargo operations. In an open position they provide access to the hold for loading and discharging cargo and in the closed position they seal the hatchway in a weathertight manner.

How do you secure hatch cover?

Once opened, hatch covers should be secured properly, using the chain stoppers, chocks or other devices recommended by the manufacturers. Hatch openings should be well-illuminated and if there are guard rails and stanchions fitted, these need to be fixed into place.

What are the methods of testing hatch cover?

What are the methods of testing hatch cover? Various methods can be used to test a vessel’s hatch covers such as light test, chalk test, air test, putty tests, moulding tests, hose tests and ultrasonic tests (UST).

What is MacGregor hatch cover?

MacGregor hatch covers enable your general cargo vessels to carry various deck cargoes and form functional cargo areas to facilitate flexible cargo handling operations.

What is wooden hatch cover?

Hatch covers are used to cover and protect the cargo in the cargo spaces. Hatch covers close off the hatch opening and makes it water tight. In the days of wooden ships, the hatch covers were made of wooden planks, beams and boards and were covered with tarpaulins.

What is a pontoon hatch cover?

PMT delivers lift-away (pontoon) hatch covers that enables vessel operators to carry deck cargo and project cargo on their hatch covers. These hatch covers are designed double skinned to have minimum stacking height and easy maintenance.