Brochure

104
Selection Guides
Heating water with steam Lbs./hr. Condensate = GPM x Temperature Rise ˚F
2
Heating fuel oil with steam Lbs./hr. Condensate = GPM x Temperature Rise ˚F
4
Heating air with steam coils Lbs./hr. Condensate = CFM x Temperature Rise ˚F
900
Radiation conversion Lbs./hr. Condensate = sq. ft. EDR
4
Heating liquids other than water with steam Lbs./hr. Condensate = (R) x (W) x (
ΔT) x (H)
1,000
where:
(R) = Rate of flow of fluid to be heated (gal./hr.)
(W) = Weight of fluid (lbs./hr.)
(
ΔT) = Fluid temperature rise ˚F
(H) = Specific heat of fluid being heated (BTU/lb./˚F)
Cv (valve coefficient) for steam, when: When P2 ≤ 0.58 P1:
P1 = Inlet pressure in psia Cv = lbs./hr.
1.71 x P1
P2 = Outlet pressure in psia When P2 > 0.58 P1:
P = Pressure drop (P
1 - P2)Cv = lbs./hr.
2.1 ΔP x (P1 + P2)
C
v (valve coefficient) for liquid Cv = GPM specific gravity
Pressure drop
Steam Velocity V = 2.4 x Steam flow (lbs./hr.) x specific volume (ft
3
/lbs.)
Area of pipe (in.)
Multiply By To Get
Boiler hp 33,475 BTU/hr.
Boiler hp 34.5 Lbs./hr/ steam at 0 psig
Boiler hp 140 Sq. ft. EDR
1000 sq. ft EDR 0.5 GPM condensate
EDR (sq. ft.) 0.25 Lbs./hr. condensate
EDR (sq. ft.) 240 BTU/hr. for 2 psig steam filling radiator with
70˚F air surrounding radiator
lbs./hr. 960 BTU/hr.
lbs./in.
2
2.307 Feet water column (cold)
lbs./in.
2
2.41 Feet water column (hot)
lbs./in.
2
2.036 in. Hg
lbs./in.
2
0.069 bar
lbs. steam / hr. 0.454 kg. steam / hr.
General Usage Formulas:
Conversion Factors:
Hoffman Specialty
®
Selection Guidelines