NOV 14-P-220 mud pump

The 14-P-220 does the same job as any triplex mud pump: it circulates drilling fluid. It is the largest pump in National’s P-series. NOV rates it at 2,200 input horsepower at 105 strokes per minute, with a 14-inch stroke and a 9-inch maximum liner.

Buy this size when the rig is built around more pump horsepower than a pair of 12-P-160s, typically a deeper land rig or a platform package that already has 2,200 horsepower pumps. It is a large skid: about 86,000 pounds without the sheave, or 96,000 pounds with a Mission fluid end. The 9-inch liner needs a special liner bushing and liner cap. Smaller liners are how you raise discharge pressure.

Count the stroke and the horsepower. A 12-P-160 is 1,600 horsepower and a 12-inch stroke. The 14-P-220 is 2,200 horsepower and a 14-inch stroke. Expendables, liners, and the fluid end do not swap between them. Gear ratio on the 14-P-220 is 3.969:1, and the discharge connection is 5 inches rather than the 6-inch discharge on a 12-P-160.

Confirm you are getting the fluid end the well needs, not just a 2,200 horsepower power end. Ask whether the sheave, motors, and liner-wash system are on the skid. A 9-inch liner in the pump means the special bushing and cap have to be there too, or the next liner change stops the rig.