Hydraulics

That branch of science or engineering which treats water or other fluid in motions.

Hydrocarbons, Gaseous

An organic compound made up of the elements of carbon and hydrogen that exists as a gas at ambient conditions (14.7 psi, 73.4?/font> F).

Hydrocarbons, Liquid

An organic compound made up of the elements of carbon and hydrogen that exists as a liquid at ambient conditions (14.7 psi, 73.4?/font> F).

Hydrocleaning

Use of high pressure, high velocity water for cleaning; specifically as applied to passing hydrocleaning nozzles through sewer pipelines to clean walls and flush debris.

Hydrofracture

A special form of inadvertent return in which drilling fluid reaches the surface or waterway. Also called a frac-out.