A barrier placed along the edge of a walking surface to prevent personnel from placing their feet over the edge of an elevated walking surface.

The variation permitted in a dimensional size, position, form, etc., of a component.

A ton of refrigeration, also called a refrigeration ton, is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment.

Gross tonnage, under vessel measurement rules of various nations.

The tonne of oil equivalent (toe) is a unit of energy defined as the amount of energy released by burning one tonne of crude oil.

A top drive is a mechanical device on a drilling rig that provides clockwise torque to the drill string to drill a borehole.

Topography is the study of the forms and features of land surfaces.

The operation of completing the loading of a tank to a required ullage.

The introduction of inert gas into a tank which is already in the inert condition with the object of raising the tank pressure to prevent any ingress of air.

The tendency of a container to pivot on its bottom edge and eventually to overturn when subject to extreme rolling motions of the ship.

With the toroidal core winding technology an electric coil or winding is created by winding an electrical conductor (e.g. copper wire) through the circular ring and evenly distributing it over the circumference.

Torque is the rotational equivalent of linear force.

The torr is a unit of pressure based on an absolute scale, one torr is 133.32 Pa.

Torrefaction is a thermochemical treatment of biomass at 200 to 320 °C (392 to 608ºF).

The strain set up onto a member which is twisted without bending.

The twisting of a shaft or any other structure about an axis in a cyclical manner due to a varying applied torque.

The difference in pressure between the suction and discharge branches of a pumping system, which is required to produce a flow of liquid.

A ship having ceased to exist after a casualty, either due to being irrecoverable (actual total loss) or due to being subsequently broken up (constructive total loss) (LMIS, 1995).

The sum of production and imports subtracting exports and storage changes.

The verical height of a stationary column of liquid produced by a pump, measured from the suction level.