The rotating element of a pump used to transfer mechanical energy from the pump to velocity energy in the water.

A ring attached to the impeller designed to absorb wear instead of the impeller. Also provides a seal between high and low-pressure areas of the pump.

A situation where the flame in a boiler touches or contacts the tubes or other metal surfaces. This leads to erosion of the heating surfaces.

A common fraction with the numerator equal to or greater than the denominator. (i.e. 4/3).

A turbine that uses impulse action to change heat energy in the steam to mechanical energy.

The bearing closest to the impeller of an end-suction pump

The emission of light energy from a body as a result of raising it to a high temperature.

The process of controlled burning to reduce combustible wastes to a non-combustible residue, carbon dioxide, and other gases.

A combustion chamber used to efficiently burn waste products. Also, in a gas processing plant, used to burn waste gases from the sulphur plant.

Impurities enclosed within the filler material of a weld.

Combustion that is not complete; the products of combustion still contain combustible material.

A refrigeration system in which a secondary solution, i.e. Brine, is circulated into the air or substance to be cooled, i.e. The secondary solution flows to and from the evaporator to release the heat absorbed from the air or substance being cooled.

A boiler draft system where a fan at the boiler uptake is used to draw the flue gases from the boiler furnace.

Air that flows into a building when exterior doors are open or when air leaks in through cracks in the building envelope.

Water discharged into a sewer system and service connections from sources other than regular connections. This includes flow from yard drains, foundation drains and around manhole covers. Inflow differs from infiltration in that it is a direct discharge into the sewer rather than a leak in the sewer itself.