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Instead of entering performance curve data, you can also specify a fixed flow rate and have PIPE-FLO calculate the total dynamic head required for the pump. When troubleshooting fixed flow pump installations, it is helpful to know how PIPE-FLO internally models them.
A schematic of how PIPE-FLO internally models fixed flow pumps is shown below:
The following points about fixed flow rate pumps should be noted:
A schematic of how PIPE-FLO internally models fixed flow pumps is shown below:
The following points about fixed flow rate pumps should be noted:
- When a fixed flow rate is specified for a pump, the performance curve data (if specified) is overridden.
- PIPE-FLO models a fixed flow pump by creating two nodes in the system where the pump is installed (refer to the figure). A flow demand value equal to the set flow rate is taken out of the first pump node (the suction node) and an equal flow demand is set entering the second node (the discharge node).
- If a pump status is listed as invalid, it means that you have set the flow rate lower than what would naturally occur through the line if the pump was not installed. The pump then acts as "valve" in order to limit the flow rate to the set value. If this occurs, you should either increase the set flow rate or remove the pump.
PIPE-FLO balances the network and calculates the pressure at each node. The program checks the calculated results to insure that the pump is operating properly (the suction pressure must be less than the discharge pressure).