TLDR
NOV 8-P-80 is a Type P triplex mud pump. The marked rated row in NOV 25-101131 shows 160 SPM, 800 input HP and 720 hydraulic HP. For the 6-inch (152.4 mm) liner, that row shows 500 GPM and its maximum-discharge-pressure column heading is 2470 PSI. The 6.25-inch pressure unit pair remains unresolved and is excluded from pressure matching. These chart values do not approve operation of an installed pump.
Which source and rated row apply?
NOV document 25-101131 identifies the Type P models on PDF page 27 and provides the independent 8-P-80 table on PDF page 28, below the 7-P-50 table. Page 27 lists an 8.5-inch stroke for 8-P-80. The dagger marks the rated speed and input horsepower. Input HP and hydraulic HP are separate fields; NOV states 90% mechanical and 100% volumetric efficiency for the table. Actual flow and permissible operating conditions require the installed configuration and applicable current OEM documents.
How should the liner columns be compared?
The confirmed pressure-heading/flow pairs at the marked row are: 6 inches, 2470 PSI and 500 GPM; 5.5 inches, 2940 PSI and 420 GPM; 5 inches, 3560 PSI and 347 GPM; 4.5 inches, 4395 PSI and 281 GPM. The largest printed rated-row flow, 542 GPM, belongs to the 6.25-inch liner, whose pressure is pending. Do not combine that flow with the pressure heading of another liner. The selector uses complete liner columns and its existing duty margins; its result is a document comparison, not an operating limit or fit approval.
Why is the 6.25-inch pressure pending?
The original 6.25-inch (158.8 mm) heading prints “2280 PSI / 106.3 kg/cm²”. This unit pair is inconsistent. Neither member is adopted as a confirmed pressure rating here, and no corrected OEM value is inferred. The pressure cell is marked pending, and the selector excludes this column from pressure matching until applicable OEM clarification is obtained. The other four columns remain traceable to their own printed headings.
What should a parts request include?
Record the nameplate model and serial number, fluid-end configuration, existing part number and revision, liner bore, photographs, and applicable manual or drawing. The catalog count is an index of records; it does not confirm stock, complete factory coverage, interchangeability, service life or delivery timing. Fluid-cylinder hydrostatic test pressure must not be used as working pressure.
Parts-identification checklist
- Pump nameplate model and serial number
- Fluid-end configuration and applicable OEM document revision
- Liner bore and current part number/revision
- Photos or drawings showing the requested item
- Required flow, pressure and duty mode for source comparison
FAQ
What does the 6-inch column show at rated speed?
At 160 SPM, the 6-inch (152.4 mm) column shows 500 GPM, with 800 input HP and 720 hydraulic HP in the row. Its maximum-discharge-pressure heading is 2470 PSI. The chart assumes 90% mechanical and 100% volumetric efficiency.
Can the 6.25-inch liner be pressure-matched?
No. Its printed 2280 PSI / 106.3 kg/cm² unit pair remains unresolved. This page retains its 542 GPM rated-row flow as a source observation, marks its pressure pending, and excludes it from pressure matching.
Can the flow and pressure maxima be combined?
No. The 542 GPM rated-row flow belongs to the 6.25-inch liner with unresolved pressure. The 4395 PSI heading belongs to the 4.5-inch liner with 281 GPM at that row. These are different columns.
Does a catalog record confirm parts fit or availability?
No. Verify the serial number, fluid-end configuration, existing part number and revision, liner bore and applicable OEM drawing. A catalog record does not prove stock, interchangeability or delivery timing.
Sources and related reading
NOV 25-101131 PDF · Rated-row and power-field reading · Pump Selector
Send the identification checklist through the inquiry form below so the requested part and source revision can be checked.