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A steel ship's midship frames that are of an identical square flanged shape.

Related Terms

MIDSHIP

Approximately in the location equally distant from the bow and stern.

CATWALK

A raised walkway running fore and aft from the midship

DEAD FLAT

1) Completely calm sea state. 2) The flat-surfaced midship section of a vessel on the sides or bottom.

MIDSHIP SECTION AREA COEFFICIENT

(CM): The ratio of the immersed area of the midship section to the area of the circumscribing rectangle having a breadth equal to the breadth of the ship and a depth equal to the draught. CM = AM (B x T), CM values range from about 0.85 for fast ships to 0.99 for slow ships.

MOULDED BASE LINE

The lowest extremity of the moulded surface of the ship. At the point where this line cuts the midship section a horizontal line is drawn, and it is this line which acts as the datum for all hydrostatic calculations. This line may, or may not, be parallel to the LWL depending on the ship type.

PARALLEL MIDDLE BODY

(LP) - the length over which the midship section remains unchanged.

LP

Parallel middle body - the length over which the midship section remains unchanged.

MID-BODY LENGTH

The length of the parallel midship section of a vessel's sides fore and aft which normally would rest against a pier or dock. The length of the mid-body is important to know when voyage planning to determine if a vessel will safely be able to moor at a particular facility.

PSID

pounds per square inch differential.

PSIG

pounds per square inch gauge (PSIA - 14.696).
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