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Debco Equipment Co., Inc 2003
  Boiler Formulas


Common Conversion Factors

Boiler HP x 34.5 
Boiler HP x .069 
Boiler HP x 33.4 
Boiler HP x 139 
BTU/Hour Output 240 
EDR/1000 x 0.5 
Lbs of Steam /Hr 500 
  

= Lbs. of Steam per Hour
= Evaporation Rate Gallons per Minute (GPM)
= MBTU per Hour Output (MBH)
= Sq. Feet of Equivalent Direct Radiation (EDR)
= Sq. Feet of Equivalent Direct Radiation (EDR)
= Evaporation Rate Gallons per Minute (GPM)
= Evaporation Rate Gallons per Minute (GPM)


Condensate Pump Sizing

Evaporation Rate x
Pump GPM x

= Pump GPM Required
= Receiver Tank Size (Gallons Storage)


Example: 
2,400,000 output boiler 240 
10,000 EDR 1000
5 GPM x
15 GPM x


 = 10,000 EDR
 = 5 GPM
 = 15 GPM pump capacity
 
= 15 gallon tank


Boiler Feed Unit Sizing

Evaporation Rate x 1.85 
Evaporation Rate x 20 

Rule of Thumb: 
= Pump GPM Required
= Receiver Tank Size (Gallon Storage @ 20 minutes)
Use one gallon of storage per boiler horsepower.


Example:
3,347,900 output boiler 33,479 
100 BHP x .069 
6.9 GPM x 1.85 
6.9 GPM x 20 


= 100 BHP
= 6.9 GPM
= 12.7 Pump GPM Req.
= 138 Gallons Storage


Determining Existing Tank Capacity


Square Tank Volume
Round Tank Volume


=  H" x W" x L" 231
=  R" x R" x 3.141 x L" 231


= Gallons Capacity
= Gallons Capacity


H is height, W is width, L is length, R is radius


Circulation Pump Sizing


BTU 
GPM 
^


=    500 x GPM x ^T
=    BTU 500 x ^T
=    BTU 500 x GPM
^T is the change in temperature
 
DEBCO EQUIPMENT COMPANY   1814 South Third St.    St. Louis, MO  63104