Hello Friends,
I am designing a Water Supply Network for a region with high undulations as per the Topography.
The supply is 24 Hours in the distribution and with 3 nos. of DMA.
The Pressure ranges from 30 m H2O to as high as 90 m H2O in all the DMA's. What I thought is I will control the Pressure in the respective DMA through one single location, which brings me to a conclusion of providing 3 PRV'S for 3 DMA's. Further, I located the PRV at the inlet of each DMA and set the Pressure Setting (Initial) (m H2O) to different values but I am unable to observe any reduction in high pressure (90 m H2O). I have also tried different diameters for the PRV, still no changes.
Please suggest where I am missing the input or what could be reason for this failure?
Regards and Thank You!
Videet Deshmukh
Senior Design Engineer
L&T Construction - WET IC, Pune.
Hello Videet,
Please upload the model files for our review, to help you with this.
Sharing model files
Regards,
Sushma Choure
Bentley Technical Suppport
Thank you Sushma!
I have uploaded the model.
PRVs that you have in model have pressure settings more than what you have in your DMA, hence software fails to understand the logic of this setting and fails as you can see in the results.
E.g. In your model, for PRV1, the net available pressure is around 28m at upstream, hence PRV setting should be below or equal to 28 m so as to maintain the required pressure in the DMA.
PRV will become inactive if the pressure goes below the setting of PRV, which can be understood in detail using below mentioned wiki.
How does the Pressure Reducing Valve (PRV) work in WaterGEMS and WaterCAD?
Answer Verified By: Videet Deshmukh
Thank You Sushma.
It means for such areas, I must use more than 1 PRV for each DMA to reduce the Pressure in a steps.