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  1. jffr602

    Reducing pipe size at an inline air release valve in pressure sewer

    Our firm was called out to consult on a private sewer system malfunction. Each house in this development is equipped with grinder pumps which pushes the waste water through HDPE lines ranging from 1.5" to 3". In line flushing stations occur every 1000 feet typically. At the high points in the...
  2. jffr602

    Convert pipe size to multiple smaller pipes

    I too came up with 10 pipes and thought I would add a factor of 25% for friction but started to doubt that would be enough
  3. jffr602

    Convert pipe size to multiple smaller pipes

    I am bidding a project that will require a low water truck crossing( Peak data= 500CFS and 7F/S V) I calculate a 108" ID pipe will handle the flows but I need to use multiple smaller pipes (say 36") in order to keep the crossing accessible to trucks. The length will of pipe will be 30' and I...
  4. jffr602

    Trench Paving AC subsidence

    The 100% was limited to the top 1' of subgrade. The rest of the fill was 95% and was at optimum when compacted. When the subgrade was prepped the top 1' was scarified and recompacted. Moisture was not measured below subgrade but it did not pump during construction. I looked in the manholes...
  5. jffr602

    Trench Paving AC subsidence

    Contractor installed 15” VCP sewer line approx 12’ below finished grade. Pipe was shaded with sand, the trench was backfilled with native material (lean clay and sand) to 95%, patched with cold mix AC and reopened to traffic. The area sustained 2 significant rainfalls and daily traffic without...

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