Hi Jake and Jesse,
We have a situation. All is good and sized well.... Except, there is a median a significant distance away from the rest of the valves being served by the mainline (see attached). We don't want to change the velocity (mainline size) for the whole mainline, but we would like to oversize it only for the long run servicing this other median.
I suppose that I can change the class but as soon as the system is resized, my override will be overwritten. This will result in a residual pressure less than what I'm looking for. We don't want to modify the velocity (oversize) for the whole system.
Clues?
We have a situation. All is good and sized well.... Except, there is a median a significant distance away from the rest of the valves being served by the mainline (see attached). We don't want to change the velocity (mainline size) for the whole mainline, but we would like to oversize it only for the long run servicing this other median.
I suppose that I can change the class but as soon as the system is resized, my override will be overwritten. This will result in a residual pressure less than what I'm looking for. We don't want to modify the velocity (oversize) for the whole system.
Clues?
Steve Cook
set the type of the post as
Issue — 1 day ago
Steve,
You have two and only two levers with mainline sizing. Velocity is one, but you have a good reason for avoiding that.
The other is Flow. You can simply add a Cap on the other side to stand in for a larger demand, which will cause the pipe to get upsized.
—J
You have two and only two levers with mainline sizing. Velocity is one, but you have a good reason for avoiding that.
The other is Flow. You can simply add a Cap on the other side to stand in for a larger demand, which will cause the pipe to get upsized.
—J
Yes Jer. But, that will generate a false worst case. My goal is to have an accurate critical analysis with a reasonable residual.
Is there a way to force a length of mainline to enable us to get an accurate critical analysis while meeting this goal. I'm sorry if I'm not looking at this from the correct angle. You always enlighten me. If LandFX doesn't allow this, we'll just have to add the cap as you suggested, knowing that the demand will never be drawn, and we will have a have a false critical analysis. But the project will be built as we intend.
What a conundrum.
Steve Cook
Is there a way to force a length of mainline to enable us to get an accurate critical analysis while meeting this goal. I'm sorry if I'm not looking at this from the correct angle. You always enlighten me. If LandFX doesn't allow this, we'll just have to add the cap as you suggested, knowing that the demand will never be drawn, and we will have a have a false critical analysis. But the project will be built as we intend.
What a conundrum.
Steve Cook
In that case your only option is to use the combination of a Cap and a Custom POC. The long distance run will be fed by a Custom POC, so that it can have a different velocity. Then you’ll place a Cap at the same location, with the Custom POC’s needs, and pipe that to the primary POC.
—J
—J
Jer,
As the designer, I should have control of the velocity through a piece of pipe. (larger pipe, slower velocity).
So if LandFX allowed for a user manual override, the software would recognize this and calculate accordingly. If I were designing this manually and calculating it manually, it would be fine. Look at the graphic again please. This situation also arises in mitigation projects often. One may have a whole system (many valves) over here, but over there are two valves. We just need to lower to 3FPS for that long distance, not the whole project. The answer shouldn't be add a new POC. The answer should be just manually override the pipe size and the LandFX will recognize your user input.
Remember, it's hard enough educating plan checkers as it is without adding a ghost POC and critical analysis which is really not there.
No response necessary.
Please add to the wish list.
Steve Cook
As the designer, I should have control of the velocity through a piece of pipe. (larger pipe, slower velocity).
So if LandFX allowed for a user manual override, the software would recognize this and calculate accordingly. If I were designing this manually and calculating it manually, it would be fine. Look at the graphic again please. This situation also arises in mitigation projects often. One may have a whole system (many valves) over here, but over there are two valves. We just need to lower to 3FPS for that long distance, not the whole project. The answer shouldn't be add a new POC. The answer should be just manually override the pipe size and the LandFX will recognize your user input.
Remember, it's hard enough educating plan checkers as it is without adding a ghost POC and critical analysis which is really not there.
No response necessary.
Please add to the wish list.
Steve Cook
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