The purpose and function of a hatch cover and its coamings is to prevent ingress of water into a cargo hold after a large opening has been cut in the deck for cargo access.
Hatch covers are a moveable structure designed to a weathertight standard.
Function of hatch cover are –
To maintain sufficient strength to resist green seas landing on hatches in extreme weather
To maintain a barrier against ingress of water during normal seagoing weather conditions
Hatch covers provide a primary structural and weathertight barrier to prevent water ingress into cargo holds.
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