Pump Horsepower Calculation
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The power added to the fluid flow by the pump (Po), is defined using SI units by:
where: PO = the output power of the pump (W) = ρ = the fluid density (kg/m3) = g = the gravitational constant (9.81 m/s2) = H = the energy Head added to the flow (m) = Q = the flow rate (m3/s) =
∆P =
99.99 bars =
Fluid Spec. Gravity =
Fluid Density =
48,902.3 1066 9.81 956.52 0
101.96 kg/cm2 =
1.13 @ 20/20 oC =
1,123.0 kg/m3 =
=
48.9 kW (Esta potencia no incluye ineficienc
956.52 meters
70.11 lb/ft3 =
9.37
o incluye ineficiencia)
lb/gal
Art Montemayor
September 02, 2009 Rev: 0
Reciprocating Pump Performance
Reference: API Standard 674 Second Edition, June 1995 Positive Displacement Pumps - Reciprocating
The power required for driving a single-acting power pump shall be calculated as follows:
1 kW = ( Q ) ( ∆P ) + ( Q ) ( Pd ) Eff
where, Q Pd Ps Eff ∆P
= Suction flow = = Discharge pressure = = Suction pressure = = Overall Eff., fraction = = (Pd - Ps) = kW =
6.5 m3/h = 101.01 BarA = 1.02 BarA = 0.95 99.99 Bar =
1 + Ps − 1 Pd 28.6 gpm 1,465.08 psia 14.80 psia 1,450.28 psi
650.6 (No puede ser!)
Wrong answer; the equation is not corre
In U.S. Customary units, the above equation transforms to the following:
hp =
( Q ) ( ∆P )+ Q ( ) P( d ) 1714
hp =
1 − Eff
1714 24.2
=
1 + Ps 1 Pd
48.9 kW (Esto tiene sentido!)
Reasonable answer; this e
Note: The above API 674 equation for the kW requirement of a single-acting power pump is wrong. The correct equation is said to be:
kW =
( Q ) ( ∆P )+ Q( P) (
d
)
1 − Eff
36 kW =
0.7
1 + Ps 1 P d
Still wrong answer; the equation is not correct!
Pagina 3 de 5
Nombre de Archivo: 23226988.xls Hoja: Bomba Reciproca
Art Montemayor
Reciprocating Pump Performance
Pagina 4 de 5
September 02, 2009 Rev: 0
Nombre de Archivo: 23226988.xls Hoja: Bomba Reciproca
Pump Horsepower Calculation GPSA Data Book Section 12
hp =
Q h SpGr 3960 eff
Gasoline Pump for SNG site hp = Unknown Horsepower h = 297 ft of head ∆P*2.31/spgr h = spgr = 0.64 specific gravity eff = 70% pump % efficiency ∆P = 82 psi Q = 100 gpm = 3,429 B/Day Q = 36,000 B/Day = 1,050 gpm
hp =
7
where: PO = the output power of the pump (W) = ρ = the fluid density (kg/m3) = g = the gravitational constant (9.81 m/s2) = H = the energy Head added to the flow (m) = Q = the flow rate (m3/s) =
∆P =
99.99 bars =
Fluid Spec. Gravity =
Fluid Density =
48,902.3 1066 9.81 956.52 0
101.96 kg/cm2 =
1.13 @ 20/20 oC =
1,123.0 kg/m3 =
=
48.9 kW (Esta potencia no incluye ineficienc
956.52 meters
70.11 lb/ft3 =
9.37
o incluye ineficiencia)
lb/gal
Art Montemayor
September 02, 2009 Rev: 0
Reciprocating Pump Performance
Reference: API Standard 674 Second Edition, June 1995 Positive Displacement Pumps - Reciprocating
The power required for driving a single-acting power pump shall be calculated as follows:
1 kW = ( Q ) ( ∆P ) + ( Q ) ( Pd ) Eff
where, Q Pd Ps Eff ∆P
= Suction flow = = Discharge pressure = = Suction pressure = = Overall Eff., fraction = = (Pd - Ps) = kW =
6.5 m3/h = 101.01 BarA = 1.02 BarA = 0.95 99.99 Bar =
1 + Ps − 1 Pd 28.6 gpm 1,465.08 psia 14.80 psia 1,450.28 psi
650.6 (No puede ser!)
Wrong answer; the equation is not corre
In U.S. Customary units, the above equation transforms to the following:
hp =
( Q ) ( ∆P )+ Q ( ) P( d ) 1714
hp =
1 − Eff
1714 24.2
=
1 + Ps 1 Pd
48.9 kW (Esto tiene sentido!)
Reasonable answer; this e
Note: The above API 674 equation for the kW requirement of a single-acting power pump is wrong. The correct equation is said to be:
kW =
( Q ) ( ∆P )+ Q( P) (
d
)
1 − Eff
36 kW =
0.7
1 + Ps 1 P d
Still wrong answer; the equation is not correct!
Pagina 3 de 5
Nombre de Archivo: 23226988.xls Hoja: Bomba Reciproca
Art Montemayor
Reciprocating Pump Performance
Pagina 4 de 5
September 02, 2009 Rev: 0
Nombre de Archivo: 23226988.xls Hoja: Bomba Reciproca
Pump Horsepower Calculation GPSA Data Book Section 12
hp =
Q h SpGr 3960 eff
Gasoline Pump for SNG site hp = Unknown Horsepower h = 297 ft of head ∆P*2.31/spgr h = spgr = 0.64 specific gravity eff = 70% pump % efficiency ∆P = 82 psi Q = 100 gpm = 3,429 B/Day Q = 36,000 B/Day = 1,050 gpm
hp =
7
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