Published: June 17, 2014

Categories: Conversion Factors

P1090476

Some useful numbers to help get you from here to there:

       
       
  Multiply By To Obtain
       
  Atmosphere 29.92 Inches of mercury
  Atmosphere 33.92 Feet of water
  Atmosphere 14.7 Pounds per sqare inch
  Atmosphere 1.058 Tons per square foot
  Barrels (oil) 42 Gallons
  Boiler Horsepower 33,474 Btu per hour
  Boiler Horsepower 34.5 Pounds water evaporated from and at 212F
       
  BTU 778 Foot-Pounds
  BTU 0.000393 Hoursepower-hours
  BTU 0.000293 Kilowatts-hours
  BTU 0.0010307 Pounds water evaporated from and at 212F
       
  BTU per 24 hr 0.00000347 Tons of referigeration
  BTU per hour 0.00002986 Boiler horsepower
  BTU per hour 0.000393 Horsepower
  BTU per hour 0.000293 Kilowatts
  BTU per inch per sq. ft. per hour per F 0.0833 Btu per foot per sq. ft. per hour per F
       
  Cubic feet 1,728 Cubic Inches
  Cubic feet 7.48052 Gallons
  Cubic feet of water 62.37 Pounds at (at 60F)
  Cubic feet per minute 0.1247 Gallons per second
  Feet of water 0.881 Inches of mercury (at 32F)
  Feet of water 62.37 Pounds per square foot
  Feet of water 0.4335 Pounds per square inch
  Feet of water 0.0295 Atmospheres
  Feet per minute 0.01136 Miles per hour
  Feet per minute 0.01667 Feet per second
  Foot-pounds 0.001286 Btu
  Gallons (U.S.) 0.1337 Cubic feet
  Gallons (U.S.) 231 Cubic inches
  Gallons of water 8.3453 Pounds of water (at 60F)
  Horsepower 550 Foot pounds per sec
  Horsepower 33,000 Foot-pounds per min
  Horsepower 2,546 BTU per hour
  Horsepower 42.42 BTU per minute
  Horsepower 0.7457 Kilowatts
  Horsepower (boiler) 33,475 BTU per hour
  Inches of mercury (at 62F) 13.57 In. of water (at 62F)
  Inches of mercury (at 62F) 1.131 Ft. of water (at 62F)
  Inches of mercury (at 62F) 0.4912 Pounds per sq in.
  Inches of mercury (at 62F) 70.73 Pounds per sq ft.
  Inches of water (at 62F) 0.07355 Inches of mercury
  Inches of water (at 62F) 0.03613 Pounds per sq in.
  Inches of water (at 62F) 5.202 Pounds per sq ft.
  Inches of water (at 62F) 0.002458 Atmospheres
  Kilowatts 56.92 BTU per minute
  Kilowatts 1.341 Horsepower
  Kilowatts-hours 3,415 BTU
  Latent heat of ice 143.33 BTU per pound
  Pounds 7,000 Grains
  Pounds of water at 60F 0.01602 Cubic Feet
  Pounds of water at 60F 27.68 Cubic Inches
  Pounds of water at 60F 0.1198 Gallons
  Pounds of water evaporated from and at 212F 0.284 Kilowatt-hours
  Pounds of water evaporated from and at 212F 0.381 Horsepower-hours
  Pounds of water evaporated from and at 212F 970.4 BTU
  Pounds per square inch 2.309 Ft. of water (at 62F)
  Pounds per square inch 2.0416 In. of mercury (at 62F)
       
  Tons of refrigeration 12,000 BTU per hour
  Tons of refrigeration 200 BTU per minute
  Tons (Long) 2,240 Pounds
  Tons (Short) 2,000 Pounds
  Watts 44.26 Ft. pounds per min
  Watts 0.7378 Ft. pounds per sec
  Watts 0.05692 BTU per minute
  Watt-hours 3.415 BTU
  Watt-hours 2,656 Ft. pounds



     

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EDR to Pounds of condensate per hour (Divide EDR by 4) • EDR to GPM (Multiply EDR by 0.0005)

EDR to BTUH at 1 psig steam pressure (Mulitply EDR by 240) • EDR to boiler horsepower (Divide EDR by 140)

EDR to Grate Area in Square Feet (Divide EDR by 196) • BTUH to EDR (Divide BTUH by 240)

BTUH to Boiler Horsepower (Divide BTUH by 33,475) • PSIG to Feet of Water (Multiply PSIG by 2.31)

Boiler Horsepower to Pounds of Condensate per hour (Multiply BHP by 34.5) • Boiler steaming rate (regardless of type or manufacturer) = 1/2 GPM per 1,000 sq. ft. EDR

 
     
  Fuel Values: Maximum copper tubbing flow rates and BTUH loads (at 20° Δ T)
  No. 1 fuel oil = 135,000 BTU per gallon 1/2" = 1-1/2 GPM = 15,000 BTUH
  No. 2 fuel oil = 140,000 BTU per gallon 3/4" = 4 GPM = 40,000 BTUH
  No. 4 fuel oil = 155,000 BTU per gallon 1" = 8 GPM = 80,000 BTUH
  No. 5 fuel oil = 150,000 BTU per gallon 1-1/4" 14 GPM = 140,000 BTUH
  No. 6 fuel oil = 153,000 BTU per gallon 1-1/2" = 22 GPM = 220,000 BTUH
  Natural gas = 1,000 BTU per cubic foot 2" = 45 GPM = 450,000 BTUH
  Natural gas = 100,000 BTU per Therm  
  Manufactured gas = 550 BTU per cubic foot  
  Propane = 2,250 BTU per cubic foot Fahrenheit to Celsius = (°F - 32°) / 1.8
Celsius to Fahrenheit = °C x 1.8 + 32°
  Propane = 92,000 BTU per gallon  
  Electricity = 3,415 BTU per kWh  
  Anthracite coal = 13,700 BTU per pound Stream Fan Coil loads in Pounds of Steam per hour =
  Bituminous coal = 12,500 BTU per pound CFM X ΔT of air (in °F) / 800
  Wood = 14,000,000 BTU per mixed cord  
 

 

 
  EDR FOR HOT WATER RADIATORS:  
  Average water temp °F Output in BTUH per sq ft. EDR
  150 110
  155 120
  160 130
  165 140
  170 150
  175 160
  180 170
  185 180
  190 190
  195 200
  200 210
  205 220
  210 230
  215* 240
  220 250
    *(also for 1 psi steam)
     
  Pump Head Rule of Thumb:  
  Measure longest run in feet. Allow 6 feet of pump head per 100 feet (this includes an allowance for the fittings and the boiler)  
     
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