Coated gas pipe for underground use

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by toolaholic, May 24, 2006.

  1. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    used the regular black iron ,yellow coating 21' length. also needed some 10s
    so used h .depot green. inspector signed off, but never seen these green ones. the yellow has a heavier jacket. any comments?

    Natural gas piping underground
    Last edited by a moderator: Oct 13, 2012
  2. Winslow

    Winslow Plumber

    Messages:
    450
    Location:
    Hawaii
    the green is rated and is just as good. It is actually easier to use as you don't have to strip the coating to thread. make sure you wrap the pipe anywhere the coating gets compromised. Once you damage the coating on the x-tru (yellow wrapped) it will rust through rather quickly (depending on soil conditions).
  3. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    thank's ,does it have a upc stamp?
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,623
    Location:
    Cave Creek, Arizona
    comment

    My comment is that the green Scotchcoat is just about useless in the long run, unless the entire length is either tape wrapped or enclosed in a plastic sleeve. It will rust through rather quickly anywhere the "paint" is damaged, and it can be damaged somewhat easily. I have seen sections that were only a few years old that looked like swiss cheese they had so many holes in it.
  5. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
  6. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    H J , I have some time before backfill

    I,ll go over it and prime and tape the whole pipe. won't use again!
    question is your soil part of the problem? do you have to set anoig bags?
    we don't
  7. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    What kind of tape do you wrap it with?

    Thx
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,623
    Location:
    Cave Creek, Arizona
    Pe

    I do not know of any polyethylene gas pipe that would be safe and available for anyone other than a cerified installer to install.
  9. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    type of tape

    use 20 mill plumbers tape. but 1st use approved primer, let dry then tape
  10. Winslow

    Winslow Plumber

    Messages:
    450
    Location:
    Hawaii
    the coating on the x-tru can be damaged just as easily. Have had problems with it rusting through rather quicky after getting hit with a shovel. It doesn't matter what pipe you use, it the coating gets damaged and not repaired it will rust through rather quickly depending on soil conditions. The coating on the "green" pipe isn't painted on. It is an epoxy that is baked on, a huge difference.
  11. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    good info winslow thank's

    will check it all before beckfill
  12. exptape

    exptape New Member

    Messages:
    1
    Location:
    China
    good idea. if you need polyethylene coating tape, please contact me.Angelina Meng 0086-13863735038. my email is xundatape@gmail.com. we are the professional and big manufacture for PE pipe wrap tape.
  13. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    The code here requires 40 mil protection, which means 2 wraps of the 20 mil tape, over primer. The primer is very expensive, as is the tape, so the whole thing adds $5 per foot to the cost!!!!!!
  14. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,623
    Location:
    Cave Creek, Arizona
    quote; The coating on the "green" pipe isn't painted on. It is an epoxy that is baked on, a huge difference.

    I used the term paint loosely since the material is applied TO the pipe and regardless of how it is applied it still chips off and exposes the pipe material. This might not be a serious problem if the underlying pipe were galvanized, but since it is black pipe it deteriorates very quickly in an underground situation.
  15. ballvalve

    ballvalve General Engineering Contractor

    Messages:
    3,261
    Location:
    northfork, california
    All the propane companies will run the poly on a tank set quite cheaply.

    Always hated the black coated gas line because the crappy wrap tape for joints is so stiff that it cannot seal properly. It should be 2 mil with 10 wraps. Then I would coat it with a good asphalt sealer or silicone [if you can get asphalt anymore- all the CA stuff is crap water base]. That entire system is a primitive joke.

    If anyone really cared or wanted to think and MFG. it, one would slip on a section of shrink tube over joints and turns and heat it up.
    Last edited: Aug 4, 2012
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