Black poly tubing for potable water

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by leak_chaser, Oct 27, 2013.

  1. leak_chaser

    leak_chaser New Member

    Messages:
    16
    Location:
    South Carolina
    How can I tell which black poly tubing is for potable water and which isn't? Which rating/certification do I look for? The Home Depot website does not state in plain English if the tubing is for potable water or not.

    Thanks.
  2. leak_chaser

    leak_chaser New Member

    Messages:
    16
    Location:
    South Carolina
    This is for an underground line from the meter to the house.
    Not sure what you mean by formulation.
    Here is a few links:

    This one has no certifications or listings:
    http://www.homedepot.com/p/Advanced...300-ft-Polyethylene-Pipe-4-75200300/203013666

    This one is DWV rated and NSF listed (whatever that means):
    http://www.homedepot.com/p/Advanced...Poly-Pipe-2-75200500/203294164#specifications

    This one is NSF listed:
    http://www.homedepot.com/p/Advanced...ethylene-160-PSI-NSF-Pipe-2-1160100/202967364

    I tried the manufacturer's website but no luck.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    NSF listed. 200 PSI
    If it's a 2-3 bath, 1" will do depending on distance.
  4. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,511
    Location:
    Houston, TX

    I would not use that kind of tubing for your application , if it is approved or not.

    Plenty of sand may let it work for awhile.

    I would not cut corners on your install.


    Daddy Terry knows best.
    Last edited: Oct 27, 2013
  5. leak_chaser

    leak_chaser New Member

    Messages:
    16
    Location:
    South Carolina
    Thanks. But what would you use?
  6. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,511
    Location:
    Houston, TX

    Something rated over 160 PSI.

    Schedule 40 PVC would be my choice.

    That 1 inch that you listed is not all that great.
  7. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,311
    Location:
    Maine
    If you are running underground from the well or city water main you want 160lb rated poly. Around here, thats pretty much all we use, including the city water departments.
  8. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,511
    Location:
    Houston, TX

    That is some pretty thin stuff.

    I guess the city water department would like to use it. You Pay for the leaks and keep them in work digging it up and replacing it.
  9. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,311
    Location:
    Maine
    Its actually pretty thick stuff and if properly bedded it will never leak. Its the same stuff we hang submersible water pumps on.
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,255
    Location:
    Cave Creek, Arizona
    quote; including the city water departments.

    Our local paper just had a picture of some water department employees removing the poly supply to the meters and changing to copper tubing. So it seems it is NOT the panacea that everyone thought it would be, but then that has happened with a lot of plastic piping over the years.
  11. Wet_Boots

    Wet_Boots Sprinkler Guy

    Messages:
    798
    Location:
    Metro NYC
    Yesteryear's 160-psi poly has become today's 200-psi poly, by way of newer high-density resins. The old 160-psi poly made from medium-density resin is still available, but is mostly used in wells, for submersible pumps.

    The key for potable water usage is the NSF-Rated labeling, insuring that all virgin resin went into the manufacture of the poly.

    Buried as shallow as it figures to be in South Carolina, I'd consider sch 40 PVC instead, unless they got some good reason not to use it.
  12. craigpump

    craigpump Well-Known Member

    Messages:
    1,083
    Location:
    ct
    Use 160 or 200 psi poly from a reputable manufacturer like Charter Plastics, bed it in sand and be done with it.
  13. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,311
    Location:
    Maine
    Agreed. I NEVER use PVC for water supply, either below or above ground.
  14. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,255
    Location:
    Cave Creek, Arizona
    Quote: I NEVER use PVC for water supply,

    Around here PVC is about the only thing that is used.
  15. Reach4

    Reach4 Well-Known Member

    Messages:
    2,805
    Location:
    IL
    I don't have experience with any of this. I found this article of interest: http://www.usplastic.com/knowledgebase/article.aspx?contentkey=782 --in particular, the discussion of thermal expansion and contraction. They seemed to only be worried about it for when the cement was not totally hardened, but I wonder if some consideration would make sense for long runs over the long term.
  16. Wet_Boots

    Wet_Boots Sprinkler Guy

    Messages:
    798
    Location:
    Metro NYC
    Obviously, answers relate to climate and burial depth.

    If I had one best shot at a shallow house supply going by tree roots, I'd use galvanized steel as a sleeve for a plastic pipe.
  17. craigpump

    craigpump Well-Known Member

    Messages:
    1,083
    Location:
    ct
    Reach,

    I have been using hydraulic cement for decades but i have seen some guys use silicone.

    I think the concern over thermal expansion is more important in geo thermal applications where the piping does expand and contract more than in a domestic water well application. For geo thermal installations they use LinkSeals to get a positive seal regardless of pipe temperature.
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