CONVERSIONS

1 Boiler HP = 33,472 btu/hr

1 Boiler HP = 34.5 lb/hr

1 lb steam ~ 1,000 btu

1 GPM (water) = 500 lb/hr (steam)

1 Compressor HP ~ 4.3 cfm air

1 Motor HP = .745 KW

1 KW = 3,413 btu

28" Water column = 1 psig

14.7 PSIA = 0 PSIG

1 SCFM = 4.5 lb/hr Air

100% vacuum = 29.92" mercury

100% vacuum = 760 torr

12,000 BTU=1 Ton of Cooling


ENERGY DATA ALL ARE EQUAL TO 1,000,000 BTU


1 MCF of natural gas

1,000 cubic feet of natural gas

1 decatherm of natural gas

10 therms of natural gas

293.1 KW of electricity

7.29 gallons of # 2 oil

10.93 gallons of propane

1,000 lbs of steam

29.31 boiler horsepower

STEAM FORMULAS

Heating water with steam

Q = GPM/2 x (temp rise)



Heating air with steam

Q = CFM/800 x (temp rise)



Heating oil with steam

Q = GPM/4 x (temp rise)



Where



Q = lb/hr of steam

GPM = gallons per minute

CFM = cubic feet of air


TYPICAL UTILITY COSTS

Steam 80% Boiler Efficiency

(Energy Cost Only Add for water and chemicals)



Gas at $ 4.00 per mcf = $ 5.00 per 1,000 lb/hr

Gas at $ 6.00 per mcf = $ 7.50 per 1,000 lb/hr

Gas at $ 8.00 per mcf = $ 10.00 per 1,000 lb/hr

Gas at $ 10.00 per mcf = $ 12.50 per 1,000 lb/hr


AIR COSTS - 100 psig

Electricity at $.06 KWH = $.23 per 1000 CFH

Electricity at $.08 KWH = $.31 per 1000 CFH

Electricity at $.10 KWH = $.39 per 1000 CFH

Electricity at $.12 KWH = $.46 per 1000 CFH


TEMPERATURE CONVERSIONS

F = 9/5C + 32

C = 5/9 x (F-32)