Surface Rod-Lift Pumping Units

Purchase the surface unit, not only its spares

A complete surface rod-lift pumping unit is a different purchase from a downhole sucker-rod pump or a replacement bearing, brake or reducer. The inquiry must identify the surface mechanism and drive package, its connection to the rod system, and the site work included in the offer. A parts quotation cannot be compared directly with a complete installed package.

APEX publishes conventional and Endurance long-stroke units as separate product families. The following examples retain their full model designations rather than combining the largest entries into one generic pumping-unit specification.

Named catalogue examples

Values come from the model rows in the APEX Chinese Endurance table and Chinese conventional table. Those tables explicitly label torque in in-lb; the English versions abbreviate that heading incompletely. Use the identified source when transcribing the torque reference.

Stroke entries are discrete catalogue choices, not a continuous adjustment range. The load and torque labels do not establish the load history of a particular well, the permissible operating speed or a production-rate guarantee.

Define the well and drive together

Provide the well and rod-system information available to the responsible lift-system engineer, including the intended operating programme and changing production conditions. Ask the bidder to return a model-specific selection basis showing the proposed stroke, speed, loading and balance arrangement. Keep uncertainties visible instead of choosing a unit solely because its headline capacity is larger.

The RFQ should distinguish the pumping structure, reducer, motor or other drive, transmission, brake, controls, guards and balance equipment. Identify existing items to be reused and new equipment to be supplied. A familiar model prefix does not demonstrate that an old accessory fits the new assembly.

Compare package boundaries before price

Controlled foundation and transport drawings belong in the selected package's quotation and approval process. The catalogue examples are useful before those project documents exist, but they cannot replace them when an installation is accepted.

Prepare a traceable RFQ

Attach the existing equipment identity when replacing a unit, describe the proposed well duty, and list quantity, destination, required date and optional alternatives. Request a deviation schedule covering both technical selection and excluded work.

For a different supply scope, see pump-jack replacement parts or downhole sucker-rod pumps. Use the RFQ Builder to keep complete units and spare parts on separate lines. Manufacturer references are not evidence of our inventory, authorization or an accepted well design.

Review how polished-rod load, discrete stroke and drive scope affect a complete-unit selection in Pumping Unit Selection: Keep Load, Stroke and Torque Separate.