7-P-50 data references NOV 25-101131 PDF28 at 165 SPM / 500 input HP, with 90% mechanical and 100% volumetric efficiency. Extrema belong to different liner columns; tool results do not replace verification of installed-equipment operating limits. View source and liner columns

8-P-80 data references NOV 25-101131 PDF28 at 160 SPM / 800 input HP, with 90% mechanical and 100% volumetric efficiency. Extrema belong to different liner columns; the 6.25-inch pressure pair is unresolved and excluded from pressure matching; tool results do not replace verification of installed-equipment operating limits. View source and liner columns

Pump Selector

Enter the flow and pressure your job calls for — we match mud, HDD and well-service pumps whose rated capacity covers your duty point with a professional safety margin, recommend the liner size where a liner table exists, and check the power demand.

Or describe your duty in words

Required flow Required pressure Brand Category Continuous duty (24 h circulation)

Derive pressure from well data

Vertical depth (TVD) Mud weight

Reference only — hydrostatic head, not a well-control figure.

How to use

Take the duty point from your mud program: the flow rate and standpipe pressure the well plan calls for. No pressure figure yet? Open the derivation panel and estimate it from well depth and mud weight.
Enter flow and pressure in the units your program uses — GPM, L/s or m³/h for flow; PSI, bar or MPa for pressure. We convert to pump-table units behind the scenes.
Tick continuous duty when the pump circulates around the clock — we tighten the safety margin from 10% to 20%, per API practice for continuous service.
Where a liner table exists, we recommend the liner whose pressure rating sits at 115%–165% of your duty pressure — the economic wear zone. Running a liner above 85% of its rating shortens liner and piston life sharply.
We check the power demand: hydraulic horsepower P×Q/1714, divided by 0.9 mechanical efficiency, must stay within the pump’s rated input power with margin — underpowered matches are excluded.
Results assume the manufacturer’s rated SPM and a 90% mechanical / 100% volumetric efficiency basis, as published in the rating tables.
Only part of our range has published ratings online. Models without ratings appear in the “ratings on request” section — we match them manually against OEM documentation.