The measure of the ability of a ship to survive flooding accidents caused by collision or grounding.

Initial draughts of the ship before damage which must be considered when calculating the attained subdivision index A.

The division of a hull into a series of watertight compartments by means of transverse and longitudinal watertight bulkheads.

The oil drained from the piston rod stuffing boxes is mixed with sludge from the scavenge air space and has to be cleaned before it is led back into the lubricating system.

Outboard column-like support or V-arranged supports for the propeller shaft used on some ships with more than one propeller instead of bossings.

A hydrostatic test carried out to demonstrate the tightness of the tanks and the structural adequacy of the design.

A drawing that shows frame lines in elevation. Frame lines forward of the midship section are shown on the right of the center line, while those aft of the midship section on the left of the centre line.

The highest unlicensed rating in the deck department who is in direct charge of all deck hands and who in turn comes under direct orders of the master or chief mate or mate.

A close-up inspection of the hull structure and ultrasonic thickness measurements (gauging).

An electric winch for handling a lifeboat.

The travel of the piston between its extreme points: top dead center and bottom dead center.

The ropes by which ship boats are lowered or hoisted.

A coat used locally, before the first coat or between the first and the second coat, in locations where it is not easy to obtain the final thickness of paint by a simple application with gun.

A cradle or support for a lifeboat.

The outside strake of deck plating.

1. A term applied to a fore-and-aft girder running along the side of a ship at the shell and also to the outboard strake of plating on any deck. 2. The side pieces of a ladder or staircase to which the treads and risers are fastened.

A covered frame for carrying someone who is too injured or ill to walk.

Large tankers, bulk carriers or container vessels, where the hull girder stiff ness is relatively low compared to their size, and which need hull monitoring systems to measure the forces, motions and resulting stresses caused by the sea state.

Any notch, crack, hole, corner, groove, attachment or other interruption to smooth flow of stress and strain in structure introduces a concentration of stress.

The speed of a vessel adjusted to that of a pilot boat at which the pilot can safely embark.