Deadend waterline
Deadend waterline
(OP)
A water pipe will be installed with a check valve so that the flow from network #1 can come in support to network #2 if the pressure drops (e.g fire protection).
Under normal conditions, the static pressure in network 1 = 68 PSI and the static pressure in network 2 = 129 PSI.
When network 2 drops below 68 PSI (say a little under) the check valve will open and flow from network 1 will come in support to network 2.
I'm trying to find a way to maintain a minimum flow through the pipe to avoid having a dead-end waterline.
A way to maintain a minimum flow so that this volume of water (5 cubic meter = 160 m @ 200 mm) is not stagnant for more than 1-2 days.
The head differential is quite high though (129 - 68 = 61 PSI) and I don't know any diameter/length/roughness/Head-loss combination that can keep a low flow (say a drawdown in 24 hours).
Do you have any ideas of what device (purge) or simple solution that can be applied to this problem?
Thanks
Under normal conditions, the static pressure in network 1 = 68 PSI and the static pressure in network 2 = 129 PSI.
When network 2 drops below 68 PSI (say a little under) the check valve will open and flow from network 1 will come in support to network 2.
I'm trying to find a way to maintain a minimum flow through the pipe to avoid having a dead-end waterline.
A way to maintain a minimum flow so that this volume of water (5 cubic meter = 160 m @ 200 mm) is not stagnant for more than 1-2 days.
The head differential is quite high though (129 - 68 = 61 PSI) and I don't know any diameter/length/roughness/Head-loss combination that can keep a low flow (say a drawdown in 24 hours).
Do you have any ideas of what device (purge) or simple solution that can be applied to this problem?
Thanks





RE: Deadend waterline
RE: Deadend waterline
RE: Deadend waterline
I think a 1/4'' is too much.
RE: Deadend waterline
I assume your water is very clean otherwise any flow restriction will quickly block up.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Deadend waterline
RE: Deadend waterline
The check valve has to open in the opposite direction. It can't open in both side (?)
RE: Deadend waterline
RE: Deadend waterline
So we can adjust it to approx. 1 GPM.
Thanks for the reducer. I'll keep this info.