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Insulating PVC pipe

  • 18-07-2012 09:06PM
    #1
    kkelly77
    Registered Users, Registered Users 2 Posts: 1,673 ✭✭✭


    My friend who owns a business unit in an industrial park has an issue with a 40mm PVC drainage pipe (drainage from kitchen area: sink and dishwasher on 1st floor).

    It has frozen twice in the past. This, no doubt, was due to the fact the pipe was routed in a bizarre way. Where the pipe exits the building before it gets to the drain, it was installed with a section that went downward, immediately back upward and then down again. A water trap effectively. No wonder it froze.

    The PVC was replaced so now it has a natural fall toward the drain. However, my friend is still concerned it will freeze again and wants to bury the pipe. Is this the best option? How deep does a pipe need to be buried so that it is not affected by cold weather? Would wrapping in Armaflex do the trick instead? Thanks for the advice.


Comments

  • #2
    JohnnieK
    Registered Users, Registered Users 2 Posts: 2,526 ✭✭✭JohnnieK


    If it has been changed to a natural fall as you say then there is nothing to worry about.

    Unless there is a long run, in excess of 3m then it will be fine.


  • #3
    kkelly77
    Registered Users, Registered Users 2 Posts: 1,673 ✭✭✭kkelly77


    JohnnieK wrote: »
    If it has been changed to a natural fall as you say then there is nothing to worry about.

    Unless there is a long run, in excess of 3m then it will be fine.

    Do you mean run as in the amount of pipe outside the building or total length overall? If it is the latter, then the total length is well over 3m.


  • #4
    sullzz
    Registered Users, Registered Users 2 Posts: 2,409 ✭✭✭sullzz


    Once there is a fall in the pipe and no external traps or sags in the pipe you will be fine , flowing water cant freeze .


  • #5
    Calibos
    Registered Users, Registered Users 2 Posts: 7,840 ✭✭✭Calibos


    Must have imagined all the beautiful pictures of frozen waterfalls then :D


  • #6
    sullzz
    Registered Users, Registered Users 2 Posts: 2,409 ✭✭✭sullzz


    Calibos wrote: »
    Must have imagined all the beautiful pictures of frozen waterfalls then :D

    Is this HEINBLOED under a different user name


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  • #7
    paddy147
    Banned (with Prison Access) Posts: 15,857 ✭✭✭✭paddy147


    sullzz wrote: »
    Is this HEINBLOED under a different user name


    Who?????;):D:

    I think he was "asked" to take a little "holiday".....;)


  • #8
    Calibos
    Registered Users, Registered Users 2 Posts: 7,840 ✭✭✭Calibos


    We had a bathroom sink drain in a flat we rent out freeze up in the Dec 2010 freeze. Now in fairness I am sure the fall is less than recommended but surely all it takes is a dripping tap and those kinds of temperatures for a slow moving trickle to freeze in layers on the lower side of the pipe until it raches the top side and plugs it.. It had to have happened overnight and the prolonged freeze doesn't explain it, because if it had have been a gradual thing that took days it would never have really got going when the hot tap was run for a wash the following mornings.

    So I'd say to the OP that he has nothing to worry about with the replaced pipe....as long as he doesn't have a leaking tap.


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