Computing Flow Rate
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| | GO! • HowToGuides • Manuals • FAQ's • Diagrams & Schematics • Calculations and Tables • Glossary • Water Sources Technical Resources >> Calculations and Tables >> Computing Flow Rate How to Determine Flow Rate (Gallons per Minute) If you need to compute flow rate in gallons per minute (or liters per minute) of a steady flow in to a holding tank, or open discharge: you can measure the flow into a bucket, (a five gallon bucket for instance) and time the flow with a watch or clock. For instance if it takes 1 minute to fill a five gallon bucket: 5 x 1 = 5 gallons per minute. If it were to take 45 seconds: 60 seconds divided by 45 times 5 gallons = 6.6 gallons per minute. 1. Open any hose bib or faucet until pump turns on. 2. Close hose bib or faucet and let pump fill up pressure tank until it turns off. 3. Using a 1 or 5 gal. bucket, open faucet, collect and measure all water discharged until pump turns on. 4. When pump turns on, immediately close faucet and start timing pump cycle. 5. When pump turns off, record pump cycle time to refill pressure tank in seconds. 6. Divide the number of gallons collected in Step 3 by the number of seconds in Step 5. 7. Multiply the answer from Step 6 by 60. 8. The answer in Step 7 is the average pumping capacity of the pump in gallons per minute (GPM). 7
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Transcript of Computing Flow Rate
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Technical Resources >> Calculations and Tables >> Computing Flow Rate
How to Determine Flow Rate (Gallons perMinute)If you need to compute flow rate in gallons perminute (or liters per minute) of a steady flowin to a holding tank, or open discharge: youcan measure the flow into a bucket, (a fivegallon bucket for instance) and time the flowwith a watch or clock. For instance if it takes 1minute to fill a five gallon bucket: 5 x 1 = 5gallons per minute. If it were to take 45seconds: 60seconds divided by 45 times 5 gallons = 6.6 gallons per minute.1. Open any hose bib or faucet until pump turns on.
2. Close hose bib or faucet and let pump fill up pressure tank until it turnsoff.3. Using a 1 or 5 gal. bucket, open faucet, collect and measure all waterdischarged until pump turns on.
4. When pump turns on, immediately close faucet and start timing pumpcycle.
5. When pump turns off, record pump cycle time to refill pressure tank inseconds.
6. Divide the number of gallons collected in Step 3 by the number ofseconds in Step 5.7. Multiply the answer from Step 6 by 60.8. The answer in Step 7 is the average pumping capacity of the pump ingallons per minute (GPM).
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Example: Number of Gallons collected during drawdown of pressure tank(Step 3) = 20Number of Seconds in pump cycle to refill pressure tank (Step 5) = 95Gallons Per Minute (GPM) = (Gallons collected / seconds in cycle) x 60GPM = (20 / 95) x 60 so: GPM = .21 x 60 so: GPM = 12.6
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