Hello , I recently surveyed my college pipe network and wanted to make it in water cad and analyse it. I got all the surface elevations , contours etcMY DOUBT is when we connect a pipe to a tank to another tank. When there is a vertical downward/upward bend in pipe how to represent it in water cad.
I tried a lot but bend is happening only horizontally. Please help me with it.
Hello ADR,
Pipe lengths are assumed to be horizontal. So, a vertical pipe can be modeled by choosing "true" for "has user defined length", then entering the vertical length. Enter the elevations of the adjacent nodes based on the elevation difference. Profiles will show this pipe's length as horizontal, but the hydraulic results should be accurate. Let me know if you have any question.
So you know, the answer to this question is available in Bentley's online KnowledgeBase, which can be found at the following link: appsnet.bentley.com/.../Default.aspx
Please search for the kb entry 60960. You can also find other numberous frequently asked question in our knowledgebase. Thank you.
Regards,
Shahzaib Bukhari
Honestly I did not go check out the knowledge center and I am sure it is covered but what about at situation where you are modeling a high rise and you wanted to know each floor or top and bottom?
Hi nkg2,
Could you elaborate on what you mean by wanting to "know each floor or top and bottom"?
The elevations of the nodes at each end of your vertical pipe would be the elevations of the top and bottom (so you can see corresponding accurate pressure reported at each.)
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Hi Jesse (and sorry ADR for hijacking), in regards to modeling everything is typically in x,y coordinates when drawing it out but in a high rise if you put demand nodes on each floor or top and bottom (whatever the case may be) the nodes would be stacked on top of each other. Why would someone do this? Some situations I encounter is fire suppression availability in the worst case scenario or top floor, vacation units versus full time units, businesses, laundry/wash facilities, etc. which would necessitate different demands and conditions on a per floor basis. That is what I mean.
Hi Jesse Dringoli,
Please could you tell me where to enter those elevation points I did choose the 'true' option .But from there i don't know how to proceed. Please help me. :)
If there are bends and no junctions at the vertical section of a pipe. Then ?
>>If there are bends and no junctions at the vertical section of a pipe. Then ?<<
Then you will not be able to report the pressure, HGL, etc at the desired elevations. You'll need to insert a junction at the bend points.
>>Please could you tell me where to enter those elevation points I did choose the 'true' option .But from there i don't know how to proceed. Please help me. :)<<
The elevations are entered in the nodes (such as junctions, hydrants, tanks), not the pipes. At any point along the pipe where you want to report pressure, etc, you will need to insert a junction and enter the elevation. See attached.
Thank you for the instruction. I created the same in my project . I need to provide a vertical pipe to the top of the building. So i created junction J 6 at the ground level elevation and another junction J 7 at top of the building. Now I need to actually connect the pipe to the tank T1 & T2 . But when I connect J7 and T1 the pipe is having extra length. Where it is supposed to be zero. Please tell me whats the problem.? I'm struck here.
ADR,
Could you elaborate more on the overall goal of this model? In some cases, the user would approximate the building as just one junction with a demand, based on the average usage of that building.
Are you trying to model two tanks at the top of the building? Are they both located in the vicinity of J-7? If so, you could just replace J-7 with one tank. The junction is not needed unless you need to report the pressure there. You could enter a small user defined length in P-10 with a large diameter, but I'm not sure you need to include all this detail; you may need to take a step back and keep it simple.
If the headloss from the vertical pipe is not significant to your analysis, you could even replace J-6 and omit the vertical pipe. It depends on what you actually need this model for - do you need to analyze the detail of the operation of these tanks?
Also, you should avoid placing two tanks hydraulically close together, as this will cause oscillations. See the "modeling hydraulically close tanks" modeling tip in the Help documentation for more on that.
If you are new to WaterCAD, I would recommend following the Quick Start lessons in the help and considering our formal training offering. As a general hydraulic modeling reference, I would also recommend our Advanced Water Distribution Modeling and Management book. These things will help you be more efficient at modeling in WaterCAD.
www.bentley.com/.../AWDM.htm
Hope it helps,
Thank you sir.
The actual case. The building already has two tanks above where i have shown you. Obviously those tanks are connected by a pipe running on the ground. The pipe actually runs through the slabs of the building and finally at the base of the tanks a T junction is provided and split in to two so that it is connected to both the tanks. I need to calculate the pressure in the pipe, losses. Just as we do by Hardy Cross Method manually. Please tell me how to design to this scenario. If not water CAD are they any other programes which can do so?
Sounds like you have used/performed Hardy Cross Method earlier. If that's the case then to simplify or to help you step by step, please show us the representative network diagram of what you are trying to accomplish then we can help you further how to model that network in WaterCAD. Based on what you have described here, WaterCAD can give you the hydraulic results you are looking for.
Rather than all the building details and verbal illustration of connections, let us see your network drawing and then we will give further directions to achieve the hydraulic results.
It's doable but we need to have a clear picture of what your are doing so that we can help you effectively.
Thank you Akshaya. The network model is very difficult to show you. It's very complex. Instead I'll send you the site where i'm working in a picture.I need to connect the UG (underground tank) tank to the tank above the building. I have marked them in black circles. So at the bottom of the building can we provide a vertical pipe?
The basic thing is can we design a vertical Pipe ? :)