Dear Bentley Community
I have been trying to control flow into a 2 MG tank by placing a FCV on the incoming pipe. I've tried:
1. Setting controls, which did not reflect to the FCV flow at all
2. Adding FCV pattern - it only mildly affected the flow only after I added the third method
3. Added a node in front of the FCV and added negative demand during the time we want to close the valve
The last method finally stopped the flow to the tank once in a while, but not during the time when I want. What can I do further to improve the setting?
I want to:
1. Stop the flow into the 2MG completely from midnight to 6 am
2. Fluctuate the Hydraulic Grade of the tank during the rest of the time (6 am until midnight)
I'd appreciate your advice. Thank you!
PCE
Yoko,
In this case if you could upload your model file it would probably help us to diagnose and fix your issue. Usually seeing the entire model will allow us to more easily troubleshoot the issue because there may be things in the model that you might not have described which are affecting the issue.
Regards,
Mark
You can upload your files using the link below. If you could provide the label of the tank and the scenario you're working in I'llbe glad to look into the issue when I have a chance.
bentley.sharefile.com/.../r5d8517c90ae464fb
Thank you so much, Mark.
Tank - "R-2MG"
Scenario - "Scenario -1-Summer Time - Max Day EPS - R-2MG 2ft draw down and 6hr FCV Close"
Yoko
I can definitely tell you that you'll want to achieve what you're after by using controls but, I have a few question for you that hopefully help claify things a little.
1) Which control set are you trying to use for this scenario? The one that is currently assigned to it is titled "Controls Only for HSP Pumps"
2) How is the flow control valve controlled in the field? Is it just based on time or are there other things the tell it when to turn on or off such as the level in R-2MG?
Mark,
1) Originally, “Controls for HSP Pumps and FCV” was assigned to this scenario. When I added FCV pattern and J-857 to mimic the closed FCV, I changed to “Controls Only for HSP Pumps” to isolate the effect of those addition.
2) The operation of the R-2MG in the field is as followed:
- Filled mainly during the day
- 3 ft draw down daily during the night from midnight to 6 am. During the overnight draw down the R-2MG inlet valve is closed. Draw down of the reservoir may continue past 6 am to attain desired low level prior to refilling.
- Check valve is manually opened/closed a few times a day by the operator from the Water Plant
- During the day time, if two towers are full, operators open the 12” check valve to fill the R-2MG
- 8 ½ - 9 ft minimum Water Level (HG:828.5 ft - 829ft)
- There is a butterfly valve which restricts the flow to avoid the fluctuation in water levels at the towers
3) Mark, I wonder if you could keep the model I sent to you. I saved the model using WaterCAD and tried to import into WaterCAD V8i for AutoCAD yesterday. Import function did not work somehow, and when I tried to open the same file using WaterCAD now as I write you this message, everything was erased (I see the pipes, but the Flex Tables and all other data are gone). Is it possible for Bentley to send back the model I sent in?
Thanks again.
Yoko Nomura
PS I replied you by e-mail this morning, but I guess I can communicate with you only through this site for this particular issue?