دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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.