The test data shall be fit to a spline or appropriate polynomial (typically third or fourth order) for head and for
power using a least squares method. The rated/guarantee flow shall be inserted into the resulting equation
and a value for head and power calculated. These values shall be corrected for speed, viscosity and density
(specific gravity). The corrected values of head and power shall be within the tolerance bands allowed in
If specified, in addition to formal submittal of final data in accordance with 10.3.2.2, curves and test data
(corrected for speed, specific gravity and viscosity) shall be submitted within 24 h after completion of
performance testing for purchaser’s engineering review and acceptance prior to shipment.
The vendor shall provide complete performance curves, including differential head, efficiency, water NPSH3, and
power, expressed as functions of flowrate. Except for low specific-speed designs where it is not feasible, the
curves shall be extended to at least 120 % of flowrate at peak efficiency, and the rated operating point shall be
indicated. The head curve for maximum and minimum impeller diameters shall be included. The impeller
identification number, specific speed and suction-specific speed shall be shown on the curves. If applicable, the
curves shall indicate viscosity corrections. Minimum flow (both thermal and stable), preferred and allowable
operating regions, and any limitations of operation shall be indicated.