Need a quick guide to pump & fan power equations as they relate to fractional horsepower motors? We’ve created this just for you.
Power – Fans & Blowers
P = Qp / 229u
- P = Power (hp)
- Q = Flow rate (cfm)
- p = Pressure (psi)
- u = Efficiency
Power – Pumps
P = QHS / 3960u
- P = Power (hp)
- Q = Flow rate (gpm)
- H = Head (ft)
- S = Specific gravity of fluid
- u = Pump efficiency
Specific Gravity of Fluids
Liquid |
Specific Gravity |
Temp °C |
Acetone | 0.79 | 20 |
Alcohol | 0.79 | 20 |
Benzene | 0.90 | 0 |
Carbon Disulfide | 1.29 | 0 |
Ether | 0.74 | 0 |
Gasoline | 0.67 | – |
Glycerin | 1.26 | 0 |
Kerosene | 0.82 | – |
Mercury | 13.6 | – |
Milk | 1.0 | – |
Castor Oil | 0.97 | 15 |
Cotton Oil | 0.93 | 16 |
Olive Oil | 0.92 | 15 |
Sea Water | 1.04 | 15 |
Turpentine | 0.87 | – |
Water | 1.0 | 4 |