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  1. 1PE

    Adjustable vacuum release valves?

    Are there adjustable vacuum release valves? What I mean is "Can a valve be set to remain closed at negative pressure of 11 psig and open at say negative 15 psig. The application involves a siphon that will operate at a negative pressure at the apex. I'm concerned the pipe will collapse when...
  2. 1PE

    siphon collapse

    I'm designing a large diameter siphon to dewater a deep mine pool. I am currently considering 12" diameter DR 11 HDPE Pipe with fused connections. My first question is this "If I break or lose siphon will the pipe have a good potential to collapse?" Secondly, the siphon will...

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