دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The distance from apex face of derrick ridgepole to back plane of crownblock beam or crown block saver along with the center line of derrick leg according to API criterion.

n: The vertical column that used to sustain the weight in the component part of derrick. Usually two or four.

n: The distance from apex face of derrick ridgepole to back plane of crownblock beam along with the center line of derrick leg.

n: level component part in the headframe structrure ,its two ends is joined to derrick leg.

n: one of the horizontal braces between the legs of a derrick.

n: level brace between derrick leg

n: the vertical hight between the bottom surface of derrick leg and the top surface of the gate

n: the total bearing load decided by security endurence of the derrick leg.

n: nominal height of tower derrick refers to the vertical height from the back plane of derrick leg base plate to the back plane of crown beam. nominal height of open front and A type derrick refers to the vertical height from the center of derrick back plan

n: nominal height of racking paltform refers to the vertical height from the back plane of derrick leg base plate to the back plane of money board.