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Single pull macgregor type hatch cover.pdf - Cochin University of ...

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Other steel <strong>hatch</strong> <strong>cover</strong> secured weather<br />

tight with gaskets and clamping devices<br />

1) With maximum span <strong>of</strong> 1.5m. thickness increased<br />

proportionately for large spans.<br />

2)Maximum stress to be less than<br />

(minimum ultimate strength <strong>of</strong> steel)/(load factor)<br />

3)The strength and stiffness <strong>of</strong> <strong>cover</strong>s<br />

made <strong>of</strong> materials other than mild steel must<br />

be equivalent to those <strong>of</strong> mild steel to the satisfaction<br />

<strong>of</strong> administration<br />

3.3.1.2 Cleats<br />

mild steel<br />

Source: Cargo Access Equipment for Merchant Ships.<br />

load factor<br />

maximum<br />

deflection<br />

minimum<br />

29<br />

platethickness<br />

assumed load<br />

load factor<br />

maximum<br />

deflection<br />

minimum plate<br />

thickness<br />

The 1966 LLC requires that satisfactory means for securing weather tightness be<br />

provided, and gives requirements for <strong>cover</strong>s secured by tarpaulins and battens. For<br />

gasket <strong>cover</strong>s, details are usually agreed between the <strong>hatch</strong> <strong>cover</strong> designer and<br />

classification society.

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