دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a derrick or crane shaped like the letter A and used to handle heavy loads. 2. an A-shaped openwork structure that is the stationary and supporting component of the mast of a jackknife rig and to which the mast is anchored when it is in an upright or drilling position. 3. the uppermost section of a standard derrick, shaped like the letter A and used as a support in lifting objects such as the crown block to the water table.

n: A kind of "A" frame gin pole, used to elevate heavy object.

n: the working platform at the top of the derrick or mast that permits access to the sheaves of the crown block and provides a safe working area for service to the gin pole. See crown block.

n: See water table.

n: the structure at the top of the drilling derrick or mast that supports the crown block. Also called water table.

a water saturated area that lies within a zone of aeration.

n: 1. the structure at the top of the drilling derrick or mast that supports the crown block. 2. the underground level at which water is found.

n: The walkway around the top of the Derrick which allows access to the crown.

the top of the drilling mast where the crown or stationary block rests.

the upper level of groundwater.

n: The net width that can pass the crown block in the inner margin of water table.