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Thread: Help identifying DWV pipe

  1. #1
    DIY Junior Member CM2304's Avatar
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    Default Help identifying DWV pipe

    I'm in the midst of a project and I was all set to go with 3" Schedule 40 fittings for the vent and drain pipes, but as you can see by the photos, the OD of the existing 3" pipe is slightly smaller than new standard Schedule 40 3" pipe that I was prepared to use. Is anyone familiar with the type of DWV pipe in the pictures? Are fittings available for the type of pipe I have or do I have to adapt the existing stuff to Schedule 40?

    BTW - Thanks for this great forum.
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  2. #2
    Moderator & Master Plumber hj's Avatar
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    It is probably SDR pipe which, because of the thinner wall and the need to maintain an actual 3" i.d., means the o.d. has to be less than the standard sch. 40 pipe. The only fittings I have ever seen for it were bell and spigot push tight style and they were ONLY used outside a building underground. There are "bushings" which adapt it to standard pipe size fittings.
    Licensed residential and commercial plumber

  3. #3
    Plumber jimbo's Avatar
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    One of those is not sch. 40, I suppose. Here is a portion of a chart showing the OD of pipe ( ID of fitting would be in the ballpark
    What are the measurements of your pieces?


    Schedule 40
    Nom. Pipe Size (in) O.D. Average I.D. Min. Wall Nom. Wt./Ft. Max. W.P. PSI**
    1/8" 0.405 0.249 0.068 0.051 810
    1/4" 0.540 0.344 0.088 0.086 780
    3/8" 0.675 0.473 0.091 0.115 620
    1/2" 0.840 0.602 0.109 0.170 600
    3/4" 1.050 0.804 0.113 0.226 480
    1" 1.315 1.029 0.133 0.333 450
    1-1/4" * 1.660 1.360 0.140 0.450 370
    1-1/2" * 1.900 1.590 0.145 0.537 330
    2" * 2.375 2.047 0.154 0.720 280
    2-1/2" 2.875 2.445 0.203 1.136 300
    3" * 3.500 3.042 0.216 1.488 260
    3-1/2" 4.000 3.521 0.226 1.789 240
    4" * 4.500 3.998 0.237 2.118 220

  4. #4
    Plumber jimbo's Avatar
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    I am suspicious of the color,, grayish rather than white. This can mean it was inferior quality, made with a lot of regrind, instead of virgin PVC resin. Was your house built by a cut-rate builder?? What did they use for water supply??

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    DIY Junior Member CM2304's Avatar
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    The house is 40 years old and was built by a very reputable builder that is still in business. The OD of the gray pipe is 3 1/4". The pipe is branded "Evanite" and it's PVC 1. I don't think it's junk at all - it's just different. The white pipe in the photo is a regular, brand new schedule 40 coupling.

  6. #6
    DIY Senior Member dlarrivee's Avatar
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    Well since the "Evanite" doesn't say sch. 40 on it, I woudln't assume it was ...

  7. #7
    Test, Don't Guess! cacher_chick's Avatar
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    The ASTM number would lead you to the standard the pipe was manufactured under.
    It is not on the list of authorized materials for indoor plumbing in my state.

  8. #8
    DIY Senior Member zl700's Avatar
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    http://gsi.nist.gov/global/docs/vps/.../cs_219-59.pdf

    That pipe and fitting was not around for very long. It was 3.25" OD, about 2 years later everyone standardized on 3.50" for 3" DWV. It's a durable pipe, just doesnt match today's ASTM standards.

    Remove it if feasible or use a Fernco to adapt I guess.
    Last edited by zl700; 01-08-2012 at 09:17 AM.
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  9. #9
    Plumber jimbo's Avatar
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    WOW....good job bringing up that standard from 1959! Who KNEW????

    The ASTM spec ( D1784) just specifies the material, not the size schedule. I don't know what the " 2 X 4 " means, but the bottom line as we deduced it that it is not sch. 40. I would contact a plumbing supplier to see if adapter bushings are available.

  10. #10
    DIY Senior Member Chad Schloss's Avatar
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    it probably means it will fit into a 2x4 studded wall. it is probably old schedule 30 pipe. Look up schedule 30 PVC fittings and you can transition from those to schedule 40 pretty easily. Here are some schedule 30 fittings and pipe made by Genova. start on page 41 of the PDF file.

    http://genovaproducts.com/docs/PlumbingCatalog.pdf
    Last edited by Chad Schloss; 01-08-2012 at 05:56 PM.

  11. #11
    Moderator & Master Plumber hj's Avatar
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    It APPEARS that sch. 30 fittings would work, but good luck finding any. I have NEVER seen anyone stock either the pipe or fittings during my 60+ years in the business, nor have I EVER seen an installation using that type of pipe or fitting.
    Licensed residential and commercial plumber

  12. #12
    DIY Senior Member Chad Schloss's Avatar
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    go to big orange. it's there. our whole house is plumbed in schedule 30. apparently it is ok to use it for new construction here, back in 2004 anyways.

  13. #13
    plumber/piping designer cad-cat's Avatar
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    i was seeing alot of sch. 30 being used back in Michigan before i left. talk about loud drains.
    Last edited by Terry; 01-11-2012 at 02:55 PM.

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