High-pressure mud pumps are positive displacement pumps. Simply, they convert mechanical power into hydraulic power. Their mechanical components (power ends) are usually maintained by mechanics. The hydraulic part (fluid end) of the pump, however, is maintained by the drilling crew. As they are a critical part of the drilling rig equipment, it is mandatory that the drilling engineer should have a thorough knowledge of their mechanical and hydraulic components.

Below figure shows an example of the fluid end.

Item # 1 Fluid Module Only (Studded Included Items 1 – 6)

Item # 2 Stud – Frame, Threaded Ring

Item # 3 Stud – Discharge Manifold

Item # 4 Stud – Threaded Ring

Item # 5 Threaded Ring

Item # 6 Discharge Manifold

Item # 7 Threaded Plug Retainer

Item # 8 Threaded Ring

Item # 9 Cylinder Head Plug

Item # Cylinder Head Plug – Top (Included Items 9 & 17)

Item # 10 Threaded Liner Retainer

Item # 11 Lower Valve Guide

Item # 12 Retainer – Lower Valve Guide

Item # 13 Seal – Cylinder Head Plug, Liner

Item # 14 Discharge Manifold

Item # 15 Seal – Suction Manifold

Item # 16 Valve Guide Bushing

Item # 17 Upper Valve Guide

Part Number List for Popular Model Pumps