A.transport tubulars from the pipe racks to the derrick floor B.maintain constant tension on the marine riser C.store and secure the excess drill line D.lower and hoist the drill string into and out of the drilled hole
A.bevel B.seam C.butt D.bond
A.tank top B.compartment between the tank top and shell of the vessel C.inner side of the vessel's shell D.space between two transverse bottom frames
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