I am modeling Municipal system for selected hydrants. I want lead pumps of 3 booster station to be running.
There are 2 pressure zones, WESTERN and MEADOWLARK.
FLOW SCHEME IS:
Taylor Park Booster supplies Forest Ave. Standpipe and Fond Du Lac Booster suction. Lead Pump on @ 768.00'.
Forest Av. Standpipe supplies Fond Du Lac Booster suction.
Fond Du Lac Booster supplies Western Zone, Western Standpipe and Western Booster Pump suction. Lead Pump on @ 809.00'.
Western Standpipe supplies Western Zone and Western Booster suction.
Western Booster supplies Meadowlark Tower and Meadowlark pressure zone. Lead pump on @ 839.00'.
When I run model pumps fail to run and systems drains out
What do your control statement look like?
It's better to turn the pump on when HGL < 768 rather than whe nHGL = 768.
Tom-
I am not sure how to apply your Fire Flow For ISO.7zcomment. How do differentiate between HGL and nHGL?
It is "when HGL". typo.
Hi Tom-
I checked and I used "<" and I cannot get the pumps to run. Can you check the attached file and see if you can find the problem?Fire Flow.7z
Hello Dick,
There is a check valve downstream of the pump in question. It appears to be in a direction that would actually stop flow from the pump. Removing that check valve should help with the issue. In general, check valves are not required on the downstream of pump in a WaterGEMS model. The pump has a built in check valve to stop reverse flow.
Outside of these, there is a node with a very low pressure (J-754). You may want to review this as it may have an impact on the fire flow results.
Regards,
Scott
Answer Verified By: Dick Schneider