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  1. #1
    Join Date
    Nov 2012
    Posts
    15

    Underground chilled water pipes

    I have to embed around 15 meters of chilled water supply and return lines. I will give them min two coates to epoxy paint, insulate them with rigid fiber glass pipe insulation having vapor barrier over it, and finally wrap around the whole length with denso tape. Please do share if I have missed something. *I have read somewhere that pipe should be painted with two coats of zinc chromate, does it give a better protection against moisture. Thanks

  2. #2
    Join Date
    Nov 2012
    Posts
    15

    Sleeve for chilled water pipe !

    Does an underground chilled water pipe entering a building through grade beam or a wall require any kind of pipe sleeve. If so, what should be the material of the sleeve if the pipe entering is carbon steel, Sch 40. Thanks

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,761
    Merged your threads on this, and moved them to Tech to Tech.
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    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Nov 2012
    Location
    Tahlequah OK
    Posts
    131
    I would definitely install a sleeve at the building entrance and as far as the zinc chromate is concerned it can't hurt but just make sure no moisture can get to the pipe.

  5. #5
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Have you considered using pre-insulated pipe such as Perma pipe or Ricwil.

    I have made my own using standard Sch 40 PVC pipe and polyurethane foam which is available as a two part mixture and is used to insulate piping.

    As for the penetration through a wall this is normally required and also requires a link seal for expansion and water seal.

  6. #6
    Join Date
    Nov 2012
    Posts
    15
    @Alcomech - pre insulted pipes are not in much use here. Usually it's the PVC or Carbon Steel that we use for the embedded lengths of pressure pipes.

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