Pump Min. Flow Recycle Heat Gain
Pump Min. Flow Recycle Heat Gain
(OP)
Hello All,
I have a question I was hoping you guys could help out with.
I'm installing a new 5300barrel/hr pump that will be used for two services. The first will have a required flow of 5300barrel/hr and the second will have a required flow of 1500barrel/hr. We are limited on nozzles off the tank, so we are planning to route the min flow recycle line back to the pump suction. Since we are recycling 3800 barrel/hr through the min flow line for the second service, I am worried about heat gain though the recycle line since we can not use the fluid in the tank as a heat sink. How would I go about calculating what the potential heat gain will be? They will only use the pump for the second location during outages, however, this could be for a period of 1-2 days.
Thanks
I have a question I was hoping you guys could help out with.
I'm installing a new 5300barrel/hr pump that will be used for two services. The first will have a required flow of 5300barrel/hr and the second will have a required flow of 1500barrel/hr. We are limited on nozzles off the tank, so we are planning to route the min flow recycle line back to the pump suction. Since we are recycling 3800 barrel/hr through the min flow line for the second service, I am worried about heat gain though the recycle line since we can not use the fluid in the tank as a heat sink. How would I go about calculating what the potential heat gain will be? They will only use the pump for the second location during outages, however, this could be for a period of 1-2 days.
Thanks





RE: Pump Min. Flow Recycle Heat Gain
If it is centrifugal, you will not need to recycle the 3800Barrel/hr You can throttle the discharge valve until the minimum allowable flow of the pump. If it is still too much, then you recycle the difference.
RE: Pump Min. Flow Recycle Heat Gain
Centigrade Rise:
((BkW-WkW)*14.34)/ (Flow in l/m*Specific Heat)
Where:
BkW = Break kW from pump curve
WkW = Water kW = (Meters * Liters/Min)/6000
14.34 = Conversion from kW to kilocalories
http://www.mcnallyinstitute.com/01-html/1-04.html
The lowest flow that a pump can operate at without compromising mechanical reliability is the "Minimum Stable Flow". For most pumps, this is more of a limiting factor than minimum thermal flow. Minimum thermal flow often does become a critical factor, especially when dealing with volatile liquids , and it should always be checked when evaluating a pump system.
Calculating Minimum Continuous Thermal Flow
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RE: Pump Min. Flow Recycle Heat Gain
From "BigInch's Extremely simple theory of everything."