Pump ESP for infrastructure water network with loop

[tj00343]

Hello Everyone,

I've been tasked with verifying the pump external static pressure for an infrastructure water supply network. The network is a series of loops as shown in the image attached . According to the calculation notes done by the designer, the design of the network was done in watercad by taking the total flow requirement in the network and dividing it evenly to all nodes in the network in watercad.

My attempt at solving this problem:
I was thinking I would put the flow required at each building in water cad at the node closest to it and put the actual pipe sizes instead of the calculated ones and rerun the model in order to find which line has the highest pressure drop and the pump would be sized according to the pressure drop in this line. However, my problem is I don't know on what basis to calculate the flow for each building as I am not familiar with infrastructure networks and I assume using fixture units would result in a number that is quite over sized .Also, the design is based on a french norm DTU (NF DTU 60.11 P1-1) which I am not familiar with.
Any help or guidance would be appreciated

 

[Achy47]

.Hello,

Thank you for sharing your task with us. As a fellow scientist, I understand the importance of accurately verifying the pump external static pressure for an infrastructure water supply network.

Based on the information provided, it seems like your approach of using the actual pipe sizes instead of the calculated ones and re-running the model is a good start. However, I agree that calculating the flow for each building based on fixture units may not be the most accurate method.

I would suggest looking into the NF DTU 60.11 P1-1 norm to understand the design basis and requirements for the network. This will also give you a better understanding of how the designer arrived at their calculations in Watercad.

Additionally, you can also consider reaching out to the designer for clarification on their methodology and any specific considerations they may have used in their design. This can help you in making more accurate calculations and verifying the pump external static pressure.

I hope this helps and wish you all the best in your task. Keep up the good work in ensuring the reliability and efficiency of the infrastructure water supply network.