Comprehesive Boiler Manual Jan 2019

3) Energy Measurement
Energy: measuring the flow change
252 calories = 1 Btu
1 ft 3 of natural gas ≈ 1020 Btu
1 kilowatt·hr (kwh) of electricity = 3413 Btu
1 pound of Coal ≈ 9,200 Btu
1 pound of gasoline ≈ 14,300 Btu
1 pound of diesel or fuel oil ≈ 16,000 Btu
1 Therm = 100,000 Btu
1 Dekatherm (DTH) = 1,000,000 Btu
0.293 Watts = 1 Btu/hr
1 Bhp (Boiler horsepower) = 33,472 Btu/hr
1 Bhp = 34.5 lbs of steam per hr (@0psig)
The Tom Thumb is especially remembered as a
participant in an impromptu race with a horse-drawn car,
which the horse won after Tom Thumb suffered a
mechanical failure. However, the demonstration was
successful, and the railroad committed to the use of
steam locomotion. The boiler was pulling 40% more
weight than the horse, therefore Tom Thumb was
officially labelled a 1.4 horse power boiler. And BHP
designation was born.
Tom Thumb = 1.4 BHP
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