Top Drive Saver Sub
Top Drive Saver Sub is a kind of sub connected with Lower IBOP and drill pipe, mainly used in the top drive system. Not only acting as crossover sub, but also protecting lower IBOP. Top drive saver sub can be divided into general top drive saver sub and low temperature top drive saver sub. Specification of Top Drive Saver Sub Model OD mm(inch) ID mm(inch) Conn. DQA187B 187(7 23/64) 57.2(2 1/4) 6 5/8REG×NC46 DQA187A 187(7 23/64) 71.4(2 13/16) 6 5/8REG×NC50 DQA197B 197(7 3/4) 57.2(2 1/4) 6 5/8REG×NC46 DQA197A 197(7 3/4) 71.4(2 13/16) 6 5/8REG×NC50 DQA219A 219(8 5/8) 71.4(2 13/16) 7 5/8REG×NC50