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19 Cards in this Set
- Front
- Back
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Fahrenheit equals |
F=(1.8 × c)+32 |
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Celsius equals |
C= F-32÷1.8 |
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Kilo vote amps KVA /no PF |
Single phase=(kva) V×A÷1000
Two Phase= V×A×2÷1000
3 phase= V×A×1.73÷1000 |
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Kilowatt=KW |
Single phase kw V×A×Pf÷1000
3 phase kilowatt V×A×PF×1.73÷1000 |
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Safe working pressure |
SWP= 0.7854 ×A2×C ÷ A |
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Factor of Safety |
Fs =Psi÷Psi |
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Total heating surface |
SHELL =3.1416×D×L×% ÷144 TUBES= 3.1416×D×L×#Tubes ÷144 HEAD .7854×d2×#OF Tubes×2. - .7854×d2×%×2 ÷144 Add all for sq/ft ÷that by boiler type for Rated BHP |
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Return condensate percentage |
RC=MC-FC×100 ÷ MC-CC |
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Factor of evaporation |
FE= HS-(TFW-32) ÷ 970.3 |
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Horsepower of a pump |
HP=GPM×8.33×H×Spgr ÷ 33000×EFF |
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Horsepower of a motor |
VOLTS×AMPS ÷ 746 |
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Boiler efficiency |
BE = INPUT-STACK LOSS×100 ÷ INPUT 78% |
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Thermo efficiency |
TE= Ws×[Hs-(Tfw-32) ÷ Wf×C |
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Maximum allowable working pressure |
MAWP= P=Ts×t×eff ÷ Fs×R |
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Total force |
TF= P×A |
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Popping pressure 3" safety Valve 1060.29= total force |
P=TF ÷A |
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Fuel savings |
Fuel savings= T1tmp watr out -T2 tmp watr in ÷ Hs-(temp in -32) |
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Developed boiler horsepower |
Lb of steam hr=Ws× Fs ÷ 34.5
If unknown use = Ws[Hs-(Tfw-32)] ÷ 33,475
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A Simplex reciprocating pump with a 4-inch diameter water cylinder and 6 inch stroke operates at 50 Strokes per minute how many gallons per minute will the pump discharge |
A=.7854×4×4 A=12.566×50×6×.90 ÷2.31
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