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The following are some of the terms and definitions, which may prove helpful in the daily dealings with oil tankers. This list is compiled from various industry sources. While extensive, it should not be considered a complete list of all vessel and charter party related terms and definitions.
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Wall Wash Test - The procedure of introducing an appropriate liquid into a vessel's tank to test for hydrocarbon, color and other contaminants. This test is done by physically pouring the liquid down vessel's tank bulkheads and trapping a portion on filter paper. This test is also done on vessel's steam coils and sumps.

Watertight Door - A door so constructed that, when closed, it will prevent water under pressure from passing through.

Water/Cut Measurement - The procedure of locating the oil/water interface for the purpose of determining the volume of free water in a shore tank or vessel compartment. It is also used to refer to the line of demarcation of the oil/water interface.

Wedge Formula - A mathematical means to approximate small quantities of liquid and solid cargo and free water on board prior to loading and after discharge based on cargo compartment dimensions and vessel trim. The wedge formula is to be used only when the liquid does not touch all bulk heads of the vessel's tanks.

Wedge Table - A pre-calculated vessel table based on the wedge formula and displayed much like the vessel's usual innage/ullage tables. These tables, however, are for small quantities (on- board quantities, remaining on board) when the cargo or free water does not touch all bulkheads of the vessel tank.

Wing Tanks - Vessel tanks located to the port or starboard of the centerline and designated port or starboard wings or wing tanks.

Wipe Test - The procedure of physically wiping random interior areas and steam coils of vessel's tanks with absorbent white rags. This procedure is used to test the tank's coating for possible color contamination.