How to calculate gpm of a pump. It depends on the the head loss of the plumbing. Note that it is very unlikely that you will have 174 gpm at full speed. The output flow of a pump spinning at a rate of 2000rpm.
Consider half total discharge in case of double suction impeller. Where n rpm of pump. Q flow rate in gallons per minute gpm h head in feet.
Flow rates are proportional to the rpm of the pump. Gpm heat load500 t where. Once you have that information as well as a stopwatch to keep time follow these steps.
Radial high head impeller up to approx. Gpm gallons per minute. To calculate gpm you need to know the specifications of your pressure tank including how many gallons it holds the gallon drawdown and the psi.
This would correspond to 45 x 231 104 ft head assuming cold water sg 10. A horizontal 104 ft head line intersects the h q curve at the proper impeller diameter which is 512 in here in this case at a little less than rated flow approximately at 60 gpm. Approximate reference values for specific speed of centrifugal pump nq.
Disp pump displacement in cubic inches. Flow gpm rpm x disp 231. The following formula is used to calculate the required flow in any hydronic system.
14 speed is 14 the value etc. Empty the pressure tank. Gpm is the volume flow rate gallons per minute heat load is in btuhr or btuh t temperature difference between the supply and return 0f 500 is the constant for standard water properties at 600f density.
Rpm rotations per minute. To find the output flow of a hydraulic pump use this pump flow formula.