valve on pipe line

[Miguel_l_e]

hello

how could simulate (irricad) a closed valve in the end of a pipe line by gravity, to know the static pressure at an intermediate point of this pipe.

thanks

[phil]

Hi

I would probably need more details of exactly what you are trying to simulate (you are welcome to send us a design/diagram) but some things that might help are:-

1) IRRICAD needs some flow for the analysis to run so one technique that you can use is to add demand points (either a mainline one directly or a zone demand point attached to your "closed" valve) with very small flows (say 1 lph). You can then add a system flow to the management where only this very small "zone" is operating. Because any friction headlosses in the system will be almost zero reports run for this system flow will show you static pressure. Note that in the case of a gravity supply you need to make sure that the water supply pressures are set to a small (but non-zero) value like 0.1 m.

2) Pressures at intermediate points on pipes can be seen by using the "Hydraulic GradeLine" tool - if you have multiple system flows then make sure that you select the "static" one that you have created with the method above. Alternatively you can introduce junctions along the pipe (with the "Mainline Pipe Junction" tool) at the points you wish to know the pressure. Make sure that you check "Permanent" on the junction dialog, this will stop the design processes from removing the junctions (standard junctions, in straight pipes of the same type, are removed because they are considered redundant).

Hope this helps

Phil

[Miguel_l_e]

thanks