Current Definitions
The following definitions have been widely used:
| Mechanical horsepower hp(I) |
≡ 33,000 ft-lbf/min
= 550 ft·lbf/s |
|
| Metric horsepower hp(M) - also PS, ''cv, hk, pk, ks or ch |
≡ 75 kgf·m/s ≡ 735.49875 W |
|
| Electrical horsepower hp(E) |
≡ 746 W | |
| Boiler horsepower hp(S) |
≡ 33,475 BTU/h
= 9,809.5 W |
|
| Hydraulic horsepower | = flow rate (US gal/min) × pressure (psi) × 7/12,000 or |
|
In certain situations it is necessary to distinguish between the various definitions of horsepower and thus a suffix is added: hp(I) for mechanical (or imperial) horsepower, hp(M) for metric horsepower, hp(S) for boiler (or steam) horsepower and hp(E) for electrical horsepower.
Hydraulic horsepower is equivalent to mechanical horsepower. The formula given above is for conversion to mechanical horsepower from the factors acting on a hydraulic system.
Read more about this topic: Horsepower
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