PVC schedule

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by lemains, Aug 13, 2008.

  1. lemains

    lemains New Member

    Messages:
    1
    Hi,

    Sorry if this question is stupid.. but I am kind of new to this, but learning.

    As I understand all PVC has a maximum service temperature of 140° F

    Two questions:

    1. Does this apply to all PVC regardless the wall thickness? It wouldn't make sense, right?

    A 0.413 wall should resist more temperature than a 0.173 wall.... right?

    2. Are the the SDR series PVC and the Schedule 40 PVC made of the same material? Or one of them is more resistant to temperature than the other?

    link: http://www.harvel.com/pipepvc-sch40-80-dim.asp

    Thanks a lot,
  2. Master Plumber 101

    Master Plumber 101 In the Trades

    Messages:
    268
    Location:
    Wisconsin
    I thoght you could go to 160 degrees before needing to switch to cast or another type of metal. Sorry I can't give you concrete answer.:confused:
  3. Gary Slusser

    Gary Slusser That's all folks!

    Sch 40 PVC is rated for pressure at 73*f. No PVC is rated for hot water use.

    The only plastics that are rated for hot water applications are CPVC and PEX. And then I think the max temp is 100*f; that what is used for the pressure rating anyway.
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    There is some absolute temp number which is "not to ever go there" for PVC. I don't know that number. But any schedule of PVC pipe has a temperature vs. pressure spec. For schedule 40, max temp allowed for 150 PSI is 73º, which is why it falls outside the range of household use.
  5. Gary Slusser

    Gary Slusser That's all folks!

    Jimbo, IIRC, the sch 40 I used had a 425# rating at 73*f.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,537
    Location:
    Cave Creek, Arizona
    Pvc

    The thicker material will take longer to heat up, but once it does it will have the same problems as the thinner pipe. SDR is just a very, very thin pipe and because it is a drain material, the inside diameter MUST conform to the i.d. of sch. 40 pipes which might interconnect with it. Because of the thinner wall that means the o.d. is smaller than sch. 40 pipe and requires an adapter bushing to match the other pipe's o.d.
  7. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    Interisting pvc is used for W.H. POWER VENT exhaust
  8. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
  9. Gary Slusser

    Gary Slusser That's all folks!

    Anyway we got there, I couldn't remember the 425 until your numbers jogged my memory. It can't be used for warm or hot water.
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,537
    Location:
    Cave Creek, Arizona
    flue

    IT is mixing with cooler air so the temperature remains in the safe range.
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