Definition(s)
Primary Load-bearing Components
The primary load-bearing components for a mud pump shall be defined as those containing the discharge pressure, with the exception of expendable items and closure components such as liners, pistons, piston rods, packing, packing glands, valves and seats, covers, heads, clamps, bushings, plugs, and fasteners.
Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards