18 July 2017
A belt with a trapezoidal cross section, made to run in sheaves, or pulleys, with grooves of corresponding shape.
18 July 2017
An opening in a side of a standard derrick at the floor level having the form of an inverted V. This opening is opposite the drawworks. […]
18 July 2017
A void; an absence of matter of any kind. Complete vacuum is not attained, but a partial vacuum or reduction in pressure through suction is achieved […]
18 July 2017
A device used to control the rate of flow in a line to open or shut off a line completely, or to serve as an automatic […]