QZ-8 type mud pump is a horizontal three-cylinder single-acting piston pump, which is manufactured by Qingzhou Petroleum Machinery Factory Co., Ltd. using American technology and API standards.
QZ-8 Mud Pump Technical Specification
| input power | 750 hp (560 kW) |
| stroke length | 8′ (203mm) |
| maximum speed | 145 rpm |
| gear ratio | 4.5:1 |
| input speed | 652 RPM |
| Piston load | 76,800 lbs. (34,836 kg) |
| Weight | 41,850 lbs. (19,000 kg) |
QZ-8 Technical parameters
| Cylinder diameter | displacement | Rated pressure | |||||
| Inch | Millimeter | Gallon/Turn | liter/turn | gallon/min | liter/second | pounds/inch2 | MPa |
| 7 | 178 | 4.00 | 15.14 | 580 | 2196 | 1996 | 13.7 |
| 6.5 | 165 | 3.45 | 13.06 | 500 | 1893 | 2315 | 16 |
| 6.25 | 159 | 3.19 | 12.08 | 462 | 1749 | 2504 | 17.2 |
| 6 | 152 | 2.94 | 11.13 | 426 | 1613 | 2717 | 18.7 |
| 5.5 | 140 | 2.47 | 9.35 | 358 | 1355 | 3233 | 22.2 |
| 5 | 127 | 2.04 | 7.72 | 296 | 1120 | 3912 | 27.9 |
| 4.5 | 114 | 1.65 | 6.25 | 240 | 908 | 4830 | 33.3 |
| 4 | 102 | 1.31 | 4.96 | 189 | 715 | 5,000 | 34.5 |
Mechanical efficiency is 90% and volume efficiency is 100%