... The transfer case, main drive system, gear box, double-winch, mud pump, turntable, drill tower, feeding tools ... -315, 2BV5121 vacuum pump; BW850/20A reciprocate double-cylinder double-acting piston mud pump, controlled clutch combine or ... reverse circulation drilling with air-water used tap, double-wall drilling pipe, gas-water separator; can carry ... pipe (mm) (mm)D168×8×3000 multi-function drilling rig