Rotating Equipment Engineering

API 610 Pump Performance Test Result Verifier

Enter witnessed shop-test data across the API test points. The tool corrects every point to rated speed by the affinity laws and checks head, power and efficiency against the API 610 11th Edition Table 16 performance tolerances.

Developed by Allan Ronald Dones — Senior Mechanical Engineer, Rotating Equipment Specialist

Project

Item no.

Service

Input field Calculated output Propagated from the common-input value Everything runs in your browser — no data leaves this page.

1Common Inputs

Values that apply to every test point. These are propagated across the columns of the data table below, exactly as in the source calculation sheet.

Rs — Rated speed rpm From the pump datasheet

SPGR_t — SG of test fluid Water = 1.0 (see Note 2)

SPGR_a — SG of actual process fluid Used to convert test power to service power

H_s — Suction gauge elevation m Enter 0 if not recorded (Note 4)

H_d — Discharge gauge elevation m Enter 0 if not recorded (Note 4)

S_i — Suction pipe ID m Enter 1 for both if unknown (Note 5)

D_i — Discharge pipe ID m Enter 1 for both if unknown (Note 5)

Datum elevation, H m H = H_d − H_s (calculated)

2Test Point Data & Speed-Corrected Results

Leave a column's test speed blank to omit that point. Column D (rated flow) is the reference for the Table 16 checks; column A (shut-off) supplies the shut-off head check.

TDH = ΔP·100/(9.81·SPGRt) + H + ΔVh Qs = Q·(Rs/Ts) TDHs = TDH·(Rs/Ts)² Whp = Qs·TDHs·SPGRa / 367.2 BHP = P_motor·(Rs/Ts)³·SPGRa η = 100·Whp / BHP

3Test Results — API 610 11th Ed. Table 16

Enter the vendor's quoted (guaranteed) values. Actuals are taken from the speed-corrected results above — head and power at rated flow (column D), shut-off head from column A.

Rated head — actual

—

Rated power — actual

—

Efficiency — actual

—

Overall (Table 16)

AWAITING DATA

Parameter	Tolerance	Acceptable criteria	Actual	Deviation	Result
Head at rated capacity (m)	+3% / −3%	—	—	—	—
Head at shut-off (m)	—	—	—	—	—
Rated power (kW)	+4%	—	—	—	—
Rated efficiency (%)	No tolerance stated	N/A	—	—	N/A

Shut-off head band is selected from the quoted rated head, per Table 16: ≤ 75 m → ±10% · > 75 m to 300 m → ±8% · > 300 m → ±5%. Power carries an upper limit only (+4%); a measured power below the quoted value is acceptable.

4Modified Test Tolerance — if contractually required

Where the purchase order imposes tolerances tighter or looser than Table 16, enter them here as signed percentages (e.g. −2 and +2). Rows are only evaluated once both limits are entered.

Parameter	Quoted	Lower tol. %	Acceptable criteria	Actual	Deviation	Result
Head at rated capacity (m)	—		—	—	—	—
Head at shut-off (m)	—		—	—	—	—
Rated power (kW)Upper limit only	—	N/A	—	—	—	—
Rated efficiency (%)Deviation in percentage points	—		—	—	—	—

IAppendix I — Pipe Inside Diameter Quick Reference

ASME B36.10M carbon-steel pipe. Pick a size and schedule, then push the inside diameter straight into the suction or discharge field above.

Nominal pipe size

Schedule

Outside diameter

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Wall thickness

—

Inside diameter

—

Flow area

—

IIAppendix II — API 610 11th Ed. Table 16, Performance Tolerances

The acceptance bands applied by this tool. Reproduced as an aid; the purchase order and the standard itself govern.

Parameter	Condition	Tolerance
Differential head	At rated flow	+3% / −3%
Head at shut-off	Rated head ≤ 75 m (250 ft)	+10% / −10%
	Rated head > 75 m to 300 m (250 ft to 1000 ft)	+8% / −8%
	Rated head > 300 m (1000 ft)	+5% / −5%
Power	At rated flow	+4% (upper limit only)
NPSH required	At rated flow	0% — no negative tolerance
Efficiency	At rated flow	No tolerance stated
Test speed	Sec. 8.3.3.3	Within ±3% of rated speed; results corrected to rated speed

IIIAppendix III — Typical Test Loop Schematic

Where the instrument elevations H_s and H_d and the pipe inside diameters S_i and D_i are measured on a shop performance test loop.

§Notes & Conventions

Test speed. Per API 610 11th Ed. Sec. 8.3.3.3, unless otherwise agreed the test speed shall be within 3% of the rated speed shown on the pump datasheet. Test results shall be corrected to rated speed. Any point outside that band is flagged red in the data table.
Test fluid. Testing fluid for API pumps is water by default — use SPGR_t = 1.0.
Speed correction. The affinity laws are applied to every point: Q ∝ N, H ∝ N², P ∝ N³. Shaft power is then scaled by SPGR_a so the result is the power the pump will draw on the actual process liquid.
Datum elevation. This is the elevation to which NPSH values are referred. Use a positive value if the source is above the pump centreline, negative if below. If not specified, use 0 for both gauges.
Test loop pipe size. If suction and discharge pipe sizes are not recorded, enter 1 for both — the two velocity heads then cancel and the differential velocity head ΔVh becomes zero, which is the correct assumption for equal-bore piping.
Pipe schedule. See Appendix I for inside diameters, or measure the actual test-loop bore.
Acceptance. See Appendix II for the Table 16 tolerances applied. The purchase order governs where it is more onerous than the standard.
Specific-gravity handling. Differential head is derived from the measured differential pressure using the test fluid SG, and is then corrected for speed only — head is a property of the pump, not of the liquid, so it is not scaled by SPGR_a. Hydraulic and shaft power are both scaled by SPGR_a, which leaves efficiency independent of specific gravity as it must be. With water on both sides (SPGR_t = SPGR_a = 1) the results are identical to the source calculation sheet.

Scope. This verifier covers the Table 16 performance tolerances on head, power and efficiency. It does not evaluate NPSH testing, vibration acceptance, mechanical running test criteria, or the four-point curve shape requirements — those remain separate acceptance items on the shop test.