Pumps

Method # 1 : Single Point Test

Measure: i) volumetric flow rate, ii) coincident RMS power, iii) differential pressure, iv) and rotational speed while the pump is at typical operating conditions.

Applications: Constant volume constant speed pumping systems. Used to confirm design operating conditions and pump and system curves.

Steps:

• Operate pump at typical existing operating conditions for the system.

• Measure pump suction and discharge pressure, or differential pressure.

• Measure pump capacity.

• Measure motor RMS power input.

• Calculate pump and energy characteristics.

Method #2: Single Point Test with Manufacturer's Curve

Measure: i) volumetric flow rate, ii) coincident RMS power, iii) differential pressure, iv) rotational speed while the pump is at typical operating conditions.

Applications: Variable volume constant speed pumping systems. Used with manufacturer's data on the pump, motor, and drive system to determine power at other operating points.

Steps:

• Obtain manufacturer's pump performance curves.

• Operate pump at typical existing operating conditions.

• Measure pump suction and discharge pressure, or differential pressure.

• Measure pump capacity.

• Measure motor RMS power input.

• Calculate pump and energy characteristics.

Method #3: Multiple Point Test with Imposed Loads at Pump or Fan

Measure: i) volumetric flow rate and ii) coincident RMS power while the pump is at operated at a range of flow load conditions as prescribed in the test procedures.

Applications: Variable volume constant speed pumping systems. The loads are imposed downstream of the pump with existing control valves. Pump operation follows the pump curve. Pump differential pressure and rotational speed may also be measured for more complete pump system evaluation.

Steps:

Table 27.7 (Continued)
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