Friday, August 5, 2011

Example VSP Pump in SWMM 5 - Version 1

Subject:   Example VSP Pump in SWMM 5 - Version 1

Here is one way to model multiple pumps between the same downstream and upstream nodes using the pump curves and the Real Time Control Rules (RTC) in SWMM 5.  Here are the steps:

1.   Enter the data for three pumps in the browser by using the Add Pump Icon
2.   Enter three Pump Head/Flow Curves so that the 2nd and 3rd Pump Curves are the sum of the flows in the 1st and 2nd Pumps together and the sum of the flows in the 1st, 2nd and 3rd respectively for the 2nd and 3rd Pump Curves

3.   Enter a RTC Rule in the Control Editor so that when the 1st Pump is turned on – the 2nd and 3rd Pump is turned off
4.   Enter a RTC Rule in the Control Editor so that when the 2nd  Pump is turned on – the 1st  and 3rd Pump is turned off
5.   Enter a RTC Rule in the Control Editor so that when the 3rd  Pump is turned on – the 1st and 2nd Pump is turned off

Using these rules you can see that for the 1st Pump turns on when the Node WetWell has a depth below 2 feet, the 2nd Pump turns on when the Node is between a depth of 2 to 5 feet and the 3rd Pump turns on when the Node Depth is above 5 feet.

RULE Pump1
IF Node WetWell Depth <= 2
THEN PUMP PUMP2 STATUS = OFF
AND PUMP PUMP3 STATUS = OFF
Priority 1

RULE Pump2
IF Node WetWell Depth > 2
AND Node WetWell Depth <= 5
THEN PUMP PUMP1 STATUS = OFF
AND PUMP PUMP3 STATUS = OFF
Priority 2

RULE Pump3
IF Node WetWell Depth > 5
THEN PUMP PUMP1 STATUS = OFF
AND PUMP PUMP2 STATUS = OFF
Priority 3


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