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  1. #1
    Silver Member
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    May 2000
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    104
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    Golden, IL
    Tractor
    B2150HSD, JD3020

    Default Help on PVC pipe pressure ratings

    I'm finally getting around to assembling my boom sprayer. I was pricing some brass fittings at Lowes and ran across some schedule 40, 3/4" PVC pipe that appears to be rated at 400+ psi. Since going plastic in selected places would save a lot compared to brass fititngs , I was pretty interested, but I'm leery of connecting a pump capable of 300 psi to plastic pipe. Just doesn't feel good. A sprayer parts vendor told me that sch40 is only good for 100 psi. Now I'm really confused.

    Does anyone know if this pressure rating is real? Is it working pressure or burst pressure? Is there some industry spec that says that sch40 is only good to 100 psi in all cases? Are sch40 fittings rated the same as the pipe? I would hope so, but I don't want to assume anything.



    Craig
    Hershey, PA

  2. #2
    Veteran Member
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    Jul 2000
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    1,344
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    West Virginia (Eastern Panhandle)
    Tractor
    '78 Kubota B6100DT

    Default Re: Help on PVC pipe pressure ratings

    Craig:

    I suspect someone here might know the answer but If you go over to this site http://www.plbg.com and ask, they WILL know. I've gotten much good plumbing advice over there.


  3. #3

    Join Date
    Jun 2000
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    121
    Location
    Temecula, CA
    Tractor
    4300 JD, Sync Shift

    Default Re: Help on PVC pipe pressure ratings

    One problem with PVC is that with the flexing from being pressurized it will eventually fail. It's not even recommended for airlines where the pressure is closer to 100 psi.


  4. #4
    Epic Contributor Bird's Avatar
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    Mar 2000
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    38,014
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    Texas

    Default Re: Help on PVC pipe pressure ratings

    Branch, of course you're right; it ain't recommended for air lines, but that's what I used anyway in my shop and no problems at all now for over 2 years running 120 psi.

    Bird

  5. #5
    Super Member JerryG's Avatar
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    Apr 2000
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    7,203
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    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: Help on PVC pipe pressure ratings

    In my poultry houses, I run 200 psi with water in sch40. The only problem I have ever had is blowing joints loose. The joints that I have put together have worked good, but some of the ones that my construction crew put together blew apart.


  6. #6

    Join Date
    Jun 2000
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    121
    Location
    Temecula, CA
    Tractor
    4300 JD, Sync Shift

    Default Re: Help on PVC pipe pressure ratings

    Bird,
    I too use PVC for airlines, been doing it for years and have never had a problem. I just cringe each time I see something fall against a line. The day I do have a problem I'll walk myself to the wood shed for my come-uppances. Until then I'm congragulating myself on how much money I saved.
    Branch


  7. #7
    Silver Member
    Join Date
    Mar 2001
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    211
    Location
    Prairie View, OK
    Tractor
    Yanmar 147, 1987 Model Made for USA (not a grey)

    Default Re: Help on PVC pipe pressure ratings

    Hi,

    Check out "ipexinc.com" gobs of piping info.

    Sch 40 pressures vary with diameter of pipe. 3/4 pvc max press at 73 degrees Fah. 480 psi working and burst is 3 times that. Fittings should be that or better.


  8. #8

    Join Date
    Sep 2000
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    1,862
    Location
    The Fabulous Foothills of Northern California

    Default Re: Help on PVC pipe pressure ratings

    If you need a higher rating, go with schedule 80 pipe and fittings. If you need to, pipe in copper type L or better for high pressure situations. Rat...


  9. #9
    Silver Member
    Join Date
    May 2000
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    104
    Location
    Golden, IL
    Tractor
    B2150HSD, JD3020

    Default Re: Help on PVC pipe pressure ratings

    Thanks for all the input. I knew I would get a few answers here. Looks like I'm going plastic in one area away from the pump. The whole assembly will cost the same as one brass fitting. I'm still going to use brass at the pump as it is more likely to be bumped and banged.

    Thanks to all

    Craig
    Hershey, PA

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