Acceleration losses for Reciprocating plunger Pump

[bmw318be]

Hi,

Understand that reciprocating pump produce acceleration losses which would be essential to calculate. For the system that has pump running in parallel, does the consideration of calculating the acceleration losses would use different formula.

Acceleration losses is normally is calculated based on

Length
SPM (Stroke Per Minute)
Flowrates
Specific Gravity
Constant
Pipe Diameter


aCC LOSSES: (LENGTH IN FEET *STROKE PER MIN * SPECIFIC GRAVITY *FLOWRATE IN GPH /C1 = 24600 *D2 PIPE INTERNAL DIAMETER IN INCH)

We could actually reduce the acceleration losses by having shorter length, Reduce SPM, Increase pipe diameter.


I was looking at the article on pump in parallel acceleration head

[quoted]
Two or More Pumps Running in Parallel If two or more pumps operate in parallel, with a common suction line, acceleration head is calculated for the common line by assuming that all pumps are synchronized, acting as one large pump. (The capacities of all pumps are added to determine line velocity.) - See more at:

http://www.pumpsandsystems.com/topics/pumps/centrifugal-pumps/acceleration-head#sthash.FVL1pRbW.dpuf

could anyone elaborate if I shall add the capacity of 2 pump into the formula to determine the acceleration losses ? .

 

[micalbrch]

"could anyone elaborate if I shall add the capacity of 2 pump into the formula to determine the acceleration losses" Yes, that's what you must do and you must also use the diameter of the common suction line (just in case the both pumps have a short smaller connection to this line.

The best to reduce the accelaration losses is to install a suction side accumulator/pulsation dampener to each of the pumps.

 

[bmw318be]

Dear Mical,
Thanks for your kind knowledge sharing as I have very little finding on the calculation on reciprocating pump in parallel running together. So looking at the formula

aCC LOSSES: (LENGTH IN FEET *STROKE PER MIN * SPECIFIC GRAVITY *FLOWRATE IN GPH /C1 = 24600 *D2 PIPE INTERNAL DIAMETER IN INCH)

Assuming the following parameter

Flow is 686 GPH for 1 Pump
Pipe ID 4"
SPM 120
Length of Suction: My doubts

Shall I use the length starting from the Suction tank up to the pump 1 Suction port only or shall I add the suction line of pump 2 as well in the acceleration losses ?