Boiler Horsepower

Boiler horsepower vs. heat transfer area.

Boiler horsepower - a power unit from the 19^th-20^th centuries - was used to rate the capacity of a boiler to deliver steam to steam engines.

A common definition of one boiler horsepower is the amount of energy required to produce 34.5 pounds (15.65 kg) of steam per hour at pressure and temperature 0 psig (0 bar) and 212^oF (100^oC) - with feed water at pressure 0 psig and temperature 212^oF. One boiler horsepower is about 33479 Btu per hour (about 9812 watts, 8437 kcal/hr).

Boiler horsepower was used in USA, Australia, and New Zealand and have been calculated in different ways.

P_BoHP = A / k (1)

where

P_BoHP = boiler horsepower

A = heat transfer area (ft²)

k = standard area (ft²) - in New Zealand it was common to use 17, in US it was common to use 10 before year 1900 - and more common to use 5 after

Be aware that the a boiler horsepower is not the commonly accepted 550 ft lbf/s and the generally accepted conversion factor of 746 Watts = 1 horsepower does not apply.

Boiler Conversion Ratios

Boiler Conversion Ratios
from	multiply	to
sq.ft. EDR steam	240	Btu per hr.
sq.ft. EDR water	160	Btu per hr.
Boiler hp	33.5	MBtu per hr.
Boiler hp	140	sq.ft. EDR steam
Boiler hp	223	sq.ft. EDR water
Boiler hp	34.5	lb. per hr. steam
lb. per hr. steam	970	Btu per hr.
to	divide by above	from

Related Documents

ASME - International Boiler and Pressure Vessel Code
The International Boiler and Pressure Vessel Code safety rules governing design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction.
Boiler - Efficiency
Combustion gross and net calorific value.
Boiler Capacities
Steam boilers output can be expressed in Boiler Horsepower, MBTU or in Pounds of Steam delivered per hour.
Boilers - Classification
Classification of boilers according the ASME Boiler and Pressure Vessel Code.
Pumps, Fans and Turbines - Horsepower
British Horse Power as used for pumps, fans and turbines - and how to convert to other units.
Steam Boiler Rating vs. Feed Water Temperature
Boiler output vs. feed water temperature.

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Boiler Horsepower