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determining pump pressure based on max pressure

jmonn (Chemical) (OP)
4 Mar 05 11:30
We are feeding an in-line homogenizer with a Wasukesha pump.  Given the literature value of maximum pump pressure, is it possible to predict the pump pressure at various speeds?  
khan101 (Petroleum)
31 Mar 05 14:28
How hard it is to install a pressure guage and eliminate guestimation? Or spend a little bit more money and install a pressure transmitter and then graph pressure vs speed for good measurements.
TD2K (Chemical)
20 May 05 9:21
What type and model of Wasukesha pump are you using?  How are you controlling the process?  We need some more details to give you a better answer IMO.

The pump literature is not likely going to help you.  Pump discharge pressure is going to be set by the processing equipment and piping/control systems, final destination, etc downstream of the pump.
djack77494 (Chemical)
6 Jun 05 19:55
jmonn,
I think it is quite possible to predict the maximum pump pressure your system will produce.  If you're calculating this to ensure that the piping and/or equipment downstream of the pump will not be overpressurized, then proceed as follows:
1) Determine the maximum source pressure, which would typically be the maximum pressure in the vessel feeding your pump.  (Be conservative - I suggest using a PSV set point if applicable).
2) Add static head going to the pump.
3) Add the pump's differential head when deadheaded (zero flow=maximum head)
The methodology described essentially defines the information requirements that you will need to satisfy.
Good Luck,
Doug
TrevorP (Chemical)
7 Jun 05 12:02
Correct me if I'm wrong, but is this a PD pump, rather than centrifugal?  If it's the type I'm thinking of, the pressure will build up and up until one of the following happens:
1 A relief valve lifts.
2 Something - e.g. a flange or pump internals give way.
3 The back slippage through the pump equals the forward motion.
4 The motor is no longer able to produce the required energy and so trips on high amps.

The max. pressure may simply be the design pressure of the pump.  Speeding it up will not help - it will only affect the flowrate (Unless the back slippage is the issue).

On the other hand, if it's a centrifugal pump, you can use the pump affinity relationships.

As TD2K stated - we need more details to help.

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