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Pressure Zone Analysis
Jose Ortiz
Hello, I have a fairly complex model with ~46 pressure zones. I used the Pressure Zone Analysis Tool to color code the zones. However, there is one particular area that seems like it should be its own zone, but the model isn't separating it. There is…
over 1 year ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
TCVs and PRVs etc missing downstream pipe information
Emma McAlister
During the model build process a large percentage of the valves do not have the downstream pipe information populated. When I zoom to those valves flagged in the validation process as 'Downstream pipe is undefined' there is a pipe there and it is connected…
over 1 year ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Adding PRV, cant meet Demand flow gpm.
ShaherYaar Khan
Hi. I am new to Watergems. I have added a PRV in a layout due to which I have met my requoired pressures. But I am unable to meet the demand flow. My PRV is at a lower Elevation than the junctions where demand is not met. Please suggest. Thanks.
Answered
over 3 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Error: Initial flow is zero, which would result in a discharge coefficient equal to 0, which is not allowed
Gustavo Montero
Good Afternoon: I am trying to model an irrigation net with a pump, reservoir an irrigation net where all are connected. My particular situation to model is: No demand in any hydrant Pump working from the river to the reservoir Pump shot down…
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Import Controls from Modelbuilder
Mehmet Ayan
Hi, I have site data for PRV's in my model. For flow modulated PRV's I have data such as; PRV-1 Pressure Flow 35 m 5 l/s 38 m 10 l/s 41 m 15 l/s 44 m 20 l/s and for the time modulated PRV's I have…
Answered
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Optimizing pressures in a distribution network
Emma McAlister
I am trying to optimise is the performance of PRVs in a distribution network. Is the Darwin designer the best application to use for this in WaterGEMS? It appears as though I can only select pipes for my design group. Is there a way I can select the all…
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
How to model a PRSV that will allow reverse flow
Kristin Rehg
I'm modeling a looped system where the southern half of the loop is significantly lower in elevation. I wanted to put PRVs at two locations on the east and west ends of the loop where the the northern plateau drops sharply down into the valley to the…
Answered
over 5 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
PRV with Negative Pressures
John Hnatishin
Hello, I have a system that has multiple PRVs that serve multiple zones (Zone 1 595', Zone 2 522', Zone 3 390' Zone 4 205' and Zone 5 125'). I have surveyed elevations for each of the PRVs and I used HGL to set them but I am getting negative pressures…
Answered
over 5 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
RE: How do I model a combined throttle control valve and a pressure reducing valve?
MPachlhofer
Marilyn, Put the valves in series with the TCV upstream of the PRV. If there is any problem with the network balancing when the model is computed consider changing the dampening limit in the calculation options and the convergence check frequency if…
over 6 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
RE: WaterCAD - PRV and PSV
Craig Calvin
Are you trying to model a combination PRV/PSV? If so, please take a look at the following article I just created and let me know if that configuration will accurately model what you want. How to model a Combination Pressure Reducing Valve (PRV) and…
over 7 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Zero Flow after PRV valve in watergems
Zeinab Amiri
Hi I have a large water distribution network modelling in watergems. in order to reduce pressures in a proper value, I have to place some PRV valves in the network. But when I put a PRV valve, and set the pressure, the flow in that pipe gets zero, resulting…
Answered
over 7 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Fire Flow with a closed system and PRVs.
Craig Dalton
Hello, I have a closed system for a subdivision that is being designed. I used PDD's, and because of the elevation differences I have used PRV's to limit the pressure in the lowest part of the system. When I try to run a fire flow analysis, it won't…
over 7 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
RE: How can I reduce my velocities in a watermain when the source is at 293m and the fire flow demand elevation is at 248m?
Craig Calvin
Hello Abe, You can place a PRV by selecting the valve dropdown in the layout toolbar and then choose PRV. Alternatively, you can go to the Tools menu, select Layout, then PRV. In the properties grid for the PRV, take a look at the Initial Settings…
over 7 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
WaterCAD - PSV and PRV in series
Harry Huang
Hi, I am having a problem with my static WaterCAD model as follows: I have two sites, let's call them Site A and Site B. Site A is being supplied by a reservoir + pump combination. Site B is being supplied by a tank. Site A is at a lower pressure…
over 8 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Valves
Pedro Mojica
Hi, I have a pump station that has 5 constant speed pumps (11,700 gpm each) I would like to install a valve that maintains a certain pressure in the system. This valve shall remain close as long as the set pressure is maintained, once the pressure…
Answered
over 8 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Inserting PRV into WaterCAd V8i
Blaise Bayens
I added a PRV onto a pipe and when I run my Scenarios, I get negative pressures (on the factor of 10 million). The valve is connected to the system, the velocity of the flow is pretty low so I'm pretty sure that's not an issue, I've also checked my elevations…
Answered
over 9 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
WaterGEMS: PRV not working on desire pressure
mst_ab
First, please see attached picture: there is two junctions with about 80m elevation difference. The range of allowable pressure is from 36 to 60 meters, when I install a PRV (PRV-14 or PRV-22) on the pipe and set the "Pressure Setting" to 36, the…
Answered
over 9 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: PRV Issue
Jesse Dringoli
It does not matter that the HGL is not near the setting of 300 - the PRV will still not allow reverse flow. From your first post, you've stated that the downstream side has a higher HGL than the upstream, so that is why the valve closes. You should check…
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Controlling PRVs
Dennis Dunham
I have a municipal system with several PRVs to control flow into lower pressure zones. The PRVs are controlled by ground tanks in the lower zones. I constantly get notifications the PRVs are disconnected. I believe this is because I am controlling…
over 11 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Flow in PRV
Mal Sharkey
Hi Sreepathy, I am not sure which particular PRV you are having trouble with, but for example PRV 5 has an elevation of 656.7m and a setting of 10 m H20, so the value is trying to reduce the downstream pressure to 666.7 m. However, even…
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: preneting WATER HAMMER in a gravity pipeline with PRV1
Jesse Dringoli
Hello Mahdi, I haven't heard of PRVs being used specifically for surge protection before. They should work well with reducing "static" (steady state) pressure, by automatically throttling. During the transient simulation, they are essentially a fixed…
over 12 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: PRV Settings
Jesse Dringoli
Hello, The PRV element controls the downstream pressure. So, it seems that you should use the lower reading as your PRV setting. If you look at the "results" section of the PRV properties after computing your model, you'll see the status, upstream…
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
preneting WATER HAMMER in a gravity pipeline with PRV1
mahdi noori a
HI i am designing a 24.5 Km gravity water pipeline consists of: 5500m Steep pipe 350mm diameter 9000m GRP pipe 350mm diameter 10000m GRP pipe 250mm diameter i used 3 PRV to reduce high static pressure. i know in HAMMER,A PRV will not react dynamically…
over 12 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: PRV control (activating when pump turns off)
Mal Sharkey
So you have a logical control on the PRVs that says something like "set PRV pressure setting to 105psi when the pump is off"? I think the problem is that the PRV control isn't checked until after the pump goes off - giving you that 0.1hr delay…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: pressure breaker valve (PBV)
Jesse Dringoli
Seylan, Make sure you're not still looking at the PBV, as that is a different type of valve. In the properties of the PRV, looks for the "Pressure Setting" field: For more information on how these different valves work…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
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