1023B E. Weldon Ave

Fresno, CA 93704

ph: 5594935773

fax: 5594935773

alt: 5599304674

pedro

A pump test measures important aspects of the pump’s operation including flow, discharge pressure, well lift (if applicable), and power use. The end result of a pump test is an estimate of the overall efficiency of your pump and the cost of running it under the conditions of the test. The test may also give an indication of water well performance

**WHAT DO WE MEASURE?**

We measures at least four variables:

1. Water flow rate.

2. Pumping lift for a well or inlet pressure for a booster pump.

3. Pump discharge pressure.

4. Energy input to the pumping plant.**Calculations are performed with the flow, lift, and discharge pressure measurements and the results are compared to the energy input to the pumping plant. A sample pump test report and an explanation of what it measures and calculates is shown below.****Pumping Water Level (ft)**- Where the water level in the well stabilizes under constant pumping conditions.**Standing Water Level (ft)**- The water level in the well when a pump has not been running.**Draw Down (ft)**- The difference between the pumping water level and the standing water level.**Recovered Water Level (ft)**- The water level in the water well 15 minutes after shutting the pump off (check with the tester for how much time was allowed before making this measurement).**Discharge Pressure at Gauge (psi)**- The pressure on the outlet side of the pump in poundsper-square-inch**Total Lift (ft**) - Includes the pumping water level, discharge pressure, and any gauge corrections. There are also minor losses due to inlet restrictions, column friction, and fittings. These minor losses are not measured during the test.**Flow Velocity (fps)**- How fast the water is moving in the discharge pipe. It should be 1 foot per second or faster to ensure an accurate test.**Measured Flow Rate (gpm)**- The flow rate measured in gallons per minute by the tester.**Customer Flow Rate (gpm)**- The flow rate measured with the customer’s flow meter (if one is present).**Well Specific Capacity (gpm/ft draw)**- The measured flow rate divided by the draw down (line 8 divided by line 3). It is a measure of well performance, not pump performance.**Acre-Feet per 24 Hours**- The number of acre-feet pumped in 24 hours at the measured flow rate. One acre-foot of water is about equal to 325,900 gallons of water.**Cubic Feet per Second (cfs)**- The measured flow rate expressed as cubic feet of water per second.**Horsepower input to Motor**- The horsepower input to the motor read at the utility meter.**Percent of Rated Motor Load**- The estimated horsepower output of the motor divided by the name plate horsepower. If this is not between 80% and 115% it is an indication that the motor is not matched to the pumping condition.**Kilowatt Input to Motor**- The power input to the motor in terms of kilowatts. One horsepower is equal to 0.746 kilowatts.**Kilowatt-hours per Acre-Foot**- The amount of kilowatt-hours required to pump an acre-foot of water at the operating condition measured.**Cost to Pump an Acre-Foot**- Kilowatt-hours per acre-foot multiplied by the base cost per kWh.**Energy Cost ($/hour)**- The cost per hour to run the pump at the base cost per kWh.

### A typical analysis of pumping costs derived from a test, along with explanations of the variables used in the calculations is shown below.

TO EXPLAIN THE NUMBERS

**Overall Pumping Efficiency**- The improvement expected in overall pump efficiency after retrofit.**Nameplate Horsepower**- This may change if the proposed retrofit includes a horsepower change.**Motor Efficiency**- This may change if the proposed retrofit includes installing a premium high efficiency motor.**Actual Motor Input Horsepower**- The power going through the electrical meter to the motor.**Motor Loaded at**- Motor load based on the brake-horsepower output.**Flow Rate**- Flow rate at current and assumed conditions.**Pumping Level (or Input Water Level)**- This will change if this is a well and the flow changes.**Discharge Pressure**- Discharge pressure at the current and assumed conditions.**Total Dynamic Head**- The total of inlet pressure (or lift) and discharge pressure. There are also minor losses due to inlet restrictions, column friction, and fittings. These minor losses are not measured during the test.**Acre-Feet Pumped per Year**- Annual water requirements will be assumed to be unchanged. You may want to discuss this assumption with the tester so that they match your expectations (or the expectations of your pump repair company).**Average Cost per kWh**- The average cost per kilowatt-hour as stated by you, or estimated by the tester based on your pump size and rate schedule. The potential savings from a pump retrofit are directly related to this number. Check with your PG&E account representative if you are unsure of this value.**Estimated Total kWh**- The total kilowatt-hours used annually if the hours of operation or total acre-feet pumped per year are known.**Hours of Operation per Year**- Based on the current and assumed flow rate and the amount of water pumped per year.**Kilowatt-Hours per Acre-Foot**- The kilowatt-hours required to pump an acre-foot through the system.**Average Cost per Acre-Foot**- The average cost to pump an acre-foot of water through the system.

**PG&E APEP-Pump Advisory** Copyright 2018 United Pump Testing. **APEP Links**

1023B E. Weldon Ave

Fresno, CA 93704

ph: 5594935773

fax: 5594935773

alt: 5599304674

pedro