Hello,
I am facing a problem to set my PRV in the network. I have a network whose topography is a bit sharp and the difference in levels is high. I am fixing PRVs as the pressure exceeded 6 bars. but at some location it seems the PRV just does not produce the required pressure.
I have attached my model as wMODL.zipell.
regards
Hello Ahmed,
Which scenario are you using?
The only scenario that isn't set to perform a fire flow analysis is the "Peak hourly demand", but when I compute this scenario, there aren't any user notifications and the PRV results are shown below. None of the PRV pressures exceed 6 bars for that steady state scenario.
It appears you are using version 08.11.06.113?
Are you using WaterGEMS or WaterCAD?
What patch set version do you have applied? You can find the date of the applied patch set by going to Help > About WaterGEMS/WaterCAD. The date will appear on the lower-left corner of the about dialog.
Regards,
Craig Calvin
Bentley Technical Support
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Please submit the model for review along with steps to reproduce:
Sharing Hydraulic Model Files on the Haestad Forum
Thanks for sharing the model. The auxiliary results section of the fireflow alternative is not configured to save auxiliary results for your pipes, so results will be "N/A" for all elements when clicking nodes in the fire flow results browser.
See related article about this: Results show as "N/A" when clicking a node in the Fire Flow Results Browser
As an example, if I create a selection set of all elements in the model, select it as the Auxiliary Output Selection Set and select "All nodes" for the results type:
... then the results will be saved and you will be able to see velocities in pipes when clicking a fireflow node in the fireflow results browser.
For example in the fireflow flextable, the fire flow node "J-1" shows "Velocity of maximum pipe" as 3.38 m/s and the "Pipe w/ maximum velocity" as P-336. If you click J-1 in the fireflow results browser, open the pipe flextable and sort on the Velocity result field, you will see that the maximum velocity is indeed 3.38 m/s, in a few pipes including P-336:
Looking at the model plan view, these high velocity pipes are located at the source, where all of the flow is passing through 227 mm pipes that connect to the source reservoir. It looks like these pipes may be too small to handle the desired fire flow along with the other demands in the model.
Note that the fire flow alternative is not configured to use velocity as a constraint. If 3.38 m/s is not an acceptable velocity, you may want to specify the velocity constraint, so that the available fireflow results show the flow available while not exceeding the velocity constraint (or pressure constraints). This will allow you to see the change in available fireflow as you try upsizing those 227 mm pipes.