I have a POC about 90' higher up a slope than a manual control valve, POC pressure is 48psi to start. I assigned an elevation to the manual control valve (-90) using View Data, and then ran the Critical Analysis. The pressure available at critical station is still only showing the starting pressure at the POC, it does not include the additional pressure gained from the slope (I expect an additional .43psi/ft x 90' elev btwn POC and valve = 38.7psi + 48psi original at POC - misc = ~86psi). I attempted to use spot elevations instead (first time, no guarantees I did it correctly), and the critical analysis is still not showing the correct pressure.
I had expected to see a pressure loss for the mainline represented as a negative, given the slope from the POC gains us significant pressure. What am I missing?
Thanks!
Julie
I had expected to see a pressure loss for the mainline represented as a negative, given the slope from the POC gains us significant pressure. What am I missing?
Thanks!
Julie
Accepted Answer
Julie,
The Valve Schedule shows Valve 1 as having -27.48psi at the POC. But for some reason it is not showing up in the Critical Analysis.
The Valve Schedule numbers do appear correct, I think it is just an issue with that line item in the CA. We'll have to explore this a bit more when we get a chance.
--J
The Valve Schedule shows Valve 1 as having -27.48psi at the POC. But for some reason it is not showing up in the Critical Analysis.
The Valve Schedule numbers do appear correct, I think it is just an issue with that line item in the CA. We'll have to explore this a bit more when we get a chance.
--J
Accepted Answer
Julie,
The Valve Schedule shows Valve 1 as having -27.48psi at the POC. But for some reason it is not showing up in the Critical Analysis.
The Valve Schedule numbers do appear correct, I think it is just an issue with that line item in the CA. We'll have to explore this a bit more when we get a chance.
--J
The Valve Schedule shows Valve 1 as having -27.48psi at the POC. But for some reason it is not showing up in the Critical Analysis.
The Valve Schedule numbers do appear correct, I think it is just an issue with that line item in the CA. We'll have to explore this a bit more when we get a chance.
--J
A quick note, finally had a chance to look at this.
It ended up being a quick fix. When sizing the mainline, if the critical station had a negative pressure demand, it was not updating the critical analysis.
This has been fixed for the next update.
--J
It ended up being a quick fix. When sizing the mainline, if the critical station had a negative pressure demand, it was not updating the critical analysis.
This has been fixed for the next update.
--J
Thanks to you Julie for finding this (and recognizing it) and thanks to you Jer (and team) for fixing it so fast!
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