Checking Pump Performance - Grundfos SP Installation And Operating Instructions Manual

9.2 Checking pump performance

The troubleshooting chart on page
require that you test the pump's performance
against its curve. To do so, perform these steps:
1. Install pressure gauge.
2. Start pump.
3. Gradually close the outlet valve.
4. Read pressure at shut-off.
5. After taking reading, open valve to its
previous position.
6. To calculate pump performance, first convert
psi reading to feet.
For water: psi x 2.31 = ____ feet.
7. Add this to the total vertical distance from the
pressure gauge to the water level in the well
while the pump is running.
8. Refer to the specific pump curve for the shut-
off head (pressure) for that pump model. If
the measured head is close to the curve,
pump is probably OK.
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