• Pressure Zone Analysis

    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…
  • TCVs and PRVs etc missing downstream pipe information

    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…
  • Adding PRV, cant meet Demand flow gpm.

    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.
  • Error: Initial flow is zero, which would result in a discharge coefficient equal to 0, which is not allowed

    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…
  • Import Controls from Modelbuilder

    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…
  • Optimizing pressures in a distribution network

    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…
  • How to model a PRSV that will allow reverse flow

    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…
  • PRV with Negative Pressures

    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…
  • RE: How do I model a combined throttle control valve and a pressure reducing valve?

    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…
  • RE: WaterCAD - PRV and PSV

    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…
  • Zero Flow after PRV valve in watergems

    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…
  • Fire Flow with a closed system and PRVs.

    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…
  • 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?

    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…
  • WaterCAD - PSV and PRV in series

    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…
  • Valves

    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…
  • Inserting PRV into WaterCAd V8i

    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…
  • WaterGEMS: PRV not working on desire pressure

    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…
  • Re: PRV Issue

    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…
  • Controlling PRVs

    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…
  • Re: Flow in PRV

    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…
  • Re: preneting WATER HAMMER in a gravity pipeline with PRV1

    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…
  • Re: PRV Settings

    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…
  • preneting WATER HAMMER in a gravity pipeline with PRV1

    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…
  • Re: PRV control (activating when pump turns off)

    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…
  • Re: pressure breaker valve (PBV)

    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…