4 replies to this topic

[wendanilo]

Hello everyone, could anyone help me abou Suction/Discharge pressure in reciprocating pumps?

 

I know that acceleration head must be considered for NPSHa calculation, but I have doubts if it should be used to Pump Head?

 

I found some references in literature that only consider acceleration head in Suction Pressure, others in Suction and Discharge and there are some of them that say that is the same procedure for centrifugal pumps and acceleration head is only used for NPSHa calculation...

 

Does anyone know how is the correct?

 

Thank you!

[latexman]

You account for acceleration losses whereever they occur, in the suction and discharge, if they are significant in the application at hand.

[wendanilo]

You account for acceleration losses whereever they occur, in the suction and discharge, if they are significant in the application at hand.

 

thank you, latexman!

So, if I have no dampener, I will account for it in the suction and discharge...

[silkroute]

Please check into JM Campbell_handbook for gas processing. That will give you all answers of your questions.

[Jome128]

Acceleration head(ha) to be deducted from pressure at surface level, and

ha = L*V*n*C*SG/(2.31*Kg)

 

where

 

L=length of suction line

V=fluid velocity in suction line

n=pump speed

C=constant for pump type

K=theoretical fluid factor representing the reciprocal of the fraction of theoretical acceleration head.(K=2.5 for hot oil; 2.0 for most hydrocarbons)

SG=specific gravity of fluid.

g=gravitational constant