Annular blowout preventer
25 July 2017
Barrier
25 July 2017

Back-up tong

A tong suspended in the derrick, normally on the driller’s right, used to hold box end of the joint (lower half) while the pin end (upper half) is loosened and unscrewed. Also called makeup tong, as it is moved to pin end to tighten the joint to recommended torque after joint is spun in when going in the hole.