Verifying external static pressure in a looped fire fighting network

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tj00343
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Hello Everyone,

Can someone please explain to me how I would go about verifying the External Static Pressure of a pump that feeds a pressurized fire fighting network with loops in it. An image of the network is attached. I'm not being able to grasp the concept of pressure drop in a pressurized loop and to imagine the hydraulics involved.

Thank you for your response

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Attachments
  • CAD site plan of a looped fire water main network with green pipe runs, numbered nodes, and a red label reading Pump Location near the lower centre.
    upload_2018-1-11_12-13-43.png
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Discussion

The key is flow. If there is no flow, the only variation in pressure will be the result of elevation changes.
If there is flow, then you basically have a resistor network. So the changes in pressure will be elevation plus the affects from flow.