Dear Bently Team,
I am designing a water supply system. System consists of 100 km pipeline. Dam is the source of water, transimission line will supply water from Dam to a reservoir at down through gravity. The difference between normal level and lower water level of Dam is150m. Can I install Pressure reducing valve at upstream and set my hydraulic Grade level at the lower water level of dam so that pressure doesn't exceeded in the pipeline.
I am looking forward to your reply
Thanks and Regards,
Syed
If you do actually have a valve in the real system that closes/throttles to control the downstream pressure, then based on your description it should work in this situation. If it is not working as expected, please provide a copy of the model for review and reply with the name of the file: Sharing Hydraulic Model Files on the OpenFlows Forum
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Thanks Scott for your reply.
If Dam is full, I am getting more than 300m pressure at junctions and when is at lowest level of water results okay.
The reason of installing PRV at upstream to use lower pressure rating of pipe otherwise higher pressure rating will be required.
I will attach both models for your review.
Thanks,
Syed Ahmed.
Thanks Jesse,
I have uploaded model for your review
You have uploaded 2 models one for 250 elevation at dam and other for 400 m, however in none of them PRV seems to be used upstream.
As we have mentioned in previous replies if you have a valve in the real system that closes/throttles to control the downstream pressure then you introducer PRV in the model.
In your model if you install PRV upstream you will get negative pressures (depending on PRV initial HGL set) at dead ends, as pressure / HGL is already reduced downstream and dead ends have higher elevations again, so try to model elements as they are on filed.
Also is your level at dam is not constant, generally average water level is considered however here it is large difference in levels of 150 m.
If you want to check pressures for 2 different reservoir levels you can use physical alternative and 2 scenarios and model them in one model only rather than creating 2 models. In one physical alternative reservoir level can be 250 and another it can be 400 m. You can try introducing reservoir pattern if required.
Scenario and Alternative Management
Sushma Choure
Bentley Technical Suppport
Thanks Sushma for your review and reply.
Can I simulate system when reservoir is full i.e 400m with PRV settings of 250m HGL. Is this scenario practically possible for a new system?