# Boiler Capacity

## Steam boilers output can be expressed in Boiler Horsepower, MBTU or in Pounds of Steam delivered per hour

Boiler load - the capacity of a steam boiler - is often rated as boiler horse powers, lbs of steam delivered per hour, or BTU.

### Lbs Steam delivered per Hour

Large boiler capacities are often given in lbs of steam evaporated per hour under specified steam conditions.

### BTU - British Thermal Units

Since the amount of steam delivered varies with temperature and pressure, a common expression of the boiler capacity is the heat transferred over time expressed as British Thermal Units per hour. A boilers capacity is usually expressed as kBtu/hour (1000 Btu/hour) and can be calculated as

W = (hg - hf) m                                         (1)

where

W = boiler capacity (Btu/h, kW)

hg = enthalpy steam (Btu/lb, kJ/kg)

hf = enthalpy condensate (Btu/lb, kJ/kg)

m = steam evaporated (lb/h, kg/s)

### Boiler Horsepower - BHP

The Boiler Horsepower (BHP) is

• the amount of energy required to produce 34.5 pounds of steam per hour at a pressure and temperature of 0 Psig and 212 oF, with feedwater at 0 Psig and 212 oF.

A BHP is equivalent to 33,475 BTU/Hr or 8430 Kcal/Hr and it should be noted that a boiler horsepower is 13.1547 times a normal horsepower.

• 1 horsepower (boiler) = 33445.6 Btu (mean)/hr = 140671.6 calorie/min (thermo) = 140469.4 calorie (mean)/min = 140742.3 calorie (20oC)/min 9.8095x1010 erg/sec = 434107 foot-pound-force/min = 13.1548 horsepower (mech) = 13.1495 horsepower (electric) = 13.3372 horsepower (metric) = 13.1487 horsepower (water) = 9809.5 joule/sec = 9.8095 kilowatt

Horsepower (hp) can be converted into lbs of steam by multiplying hp with 34.5.

#### Example - Boiler Horsepower to lbs of Steam Conversion

200 hp x 34.5 = 6900 lbs of steam per hour

Lbs of steam can be converted to hp by dividing lbs steam per hour by 34.5

#### Example - Lbs of Steam to Boiler Horsepower Conversion

5000 lbs of steam / 34.5 = 145 hp boiler

### Converting Boiler Horse Power (BHP) to kBtu/hr

Boiler Horse Power
(BHP)
(kBtu/hr)
4.5 151
6 201
9 301
15 502
20 670
30 1004
45 1507
50 1674
60 2009
70 2344
80 2678
100 3348
• 1 BHP = 33479 Btu/hr
• 1 Btu/hr = 0.293 Watts

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