# TPC

Tonnes per centimetre immersion: the buoyancy created by increasing the draught by 1 cm.

## Related Terms

### DECKS AWASH

A situation in which the deck of the vessel is partially or wholly submerged, possibly as a result of excessive listing or a loss of buoyancy.

### CAMELS

Loaded vessels lashed tightly, one on each side of another vessel, and then emptied to provide additional buoyancy that reduces the draught of the ship in the middle.

### FLOAT CHAMBER

A sealed, hollow part attached to the compass card of a magnetic compass as part of the compass card assembly, to provide buoyancy to reduce the friction on the pivot bearing

### METACENTER

The intersection point of a vertical line drawn through the line of buoyancy of a slightly listed vessel which intersects the centerline plane

### FURNACE DRAFT

The negative air pressure generated by buoyancy of hot gases inside a furnace. The temperature difference between gases within the furnace and in the atmosphere along with furnace and stack height basically determine the amount of draft generated by the furnace. Draft is generally measured in negative inches of water column. ('-w.c.'; 27.7 inches w.c. = 1 psig)

### LCB

Longitudinal Centre of Buoyancy

### BUOYANCY

The upthrust upon a body that is partially or wholly immersed in a liquid. Colloquially, the ability of an object to float.

### L.C.B.

Longitudinal Centre of Buoyancy. The point, on the fore and aft line of a vessel at which the upward force of buoyancy acts. It is measured from amidships either forward or aft.

### LONGITUDINAL CENTRE OF BUOYANCY

The point, on the fore and aft line of a vessel at which the upward force of buoyancy acts. It is measured from amidships either forward or aft.

### METACENTRE

(M): in the case of a vessel's change in heel (transverse) or change in trim (longitudinal), the virtual centre point from which the vessel with its centre of buoyancy (B) can be considered to rotate. (for initial angles of inclination only).

### Related questions

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