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  1. ProcessHVAC

    Pumps in Series, Different Size

    We are commissioning a small train fueling facility and we are having some issues with a train fueling nozzle. Apparently, the manufacturer claims it is activated by vacuum and then pumps dead head pressure seals it, but we are finding it doesn't shutoff some times. The contractor claims the...
  2. ProcessHVAC

    Pumps in Series, Different Size

    We are commissioning a small train fuelling facility and we are having some issues with a train fuelling nozzle. Apparently, the manufacturer claims it is activated by vacuum and then pumps dead head pressure seals it, but we are finding it doesn't shutoff some times. The contractor claims the...
  3. ProcessHVAC

    PVC not allowed for underground building drain

    Why in some building/plumbing codes, PVC is not allowed for underground building drains? I am not challenging the code, but just trying to understand the rationale..
  4. ProcessHVAC

    Diesel Fuel Line crossing an Electrical Duct Bank

    Hi everyone, I am working on the design of a train fueling facility. I have 4 x (4-6") diesel fuel lines that have to cross a concrete encased electrical ductbank (underground). The Client does not want to relocate this ductbank.. The diesel fuel lines are FRP cladded double walled carbon steel...
  5. ProcessHVAC

    Type B and Type A vents?

    Dumb quesiton perhaps: my local Gas code calls for Type B vent for Category I appliances, and Type BH or"special venting" for Cat II, III and IV. I have seen some manufactures also mentioning Type A vent required for their appliances which is not mentioned in the Code. I have no problems...

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