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    What are Schedule 40 and Schedule 80 ratings for pipe?

    Asked Jul 6, 2006, 12:48 AM 15 Answers
    Ok, pvc is temperature restricted to 140 F so no hot water, cpvc can be used in the house. What is schedule 40 and schedule 80?

    Last edited by CliffARobinson; Aug 17, 2011 at 05:05 PM.
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    RickJ's Avatar
    RickJ Posts: 7,694, Reputation: 855
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    #2

    Jul 6, 2006, 02:50 AM
    In the United States, "Schedule" refers to the thickness of the pipe wall and, therefore, how much pressure it will hold. In most aquaculture applications, Schedule 40 is used because:

    1. It works for most applications and is readily available.
    2. In small quantities, it is only slightly more expensive than the thinner wall Schedule 120.
    3. The wall is thick enough so that it will not distort when walked on.
    4. From 1/2" to 2", it is rated at no less than 140 psi at 73°F. The highest pressure typically found at any facility is 65 psi, which is the average city water supply.

    Schedule 80 is rated at no less than 200 psi at 73°F (up to 2") and is usually gray (similar to the Schedule 40 pipe used for electrical conduit).

    There are very few reasons to ever need such a heavy, costly pipe for aquaculture. The outside diameter (O.D.) is the same on Schedule 120, 40 and 80, so an expensive Schedule 80 fitting could be used on Schedule 120 or 40 pipe, if that's all that was available. As the wall of the pipe gets thicker, the inside diameter (I.D.) gets smaller. With fittings, the outside diameter gets larger.

    The main reason to use Schedule 80 is if it is mandatory in your area for specific applications but it can also be used on cold water loops to help insulate. <source>
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    afaroo's Avatar
    afaroo Posts: 3,370, Reputation: 199
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    #3

    Mar 23, 2009, 11:36 PM

    I agree with RickJ, he have described very well I am attaching the following links just for information, Thanks.

    Best Regards,
    John

    Nominal Pipe Size - Wikipedia, the free encyclopedia

    PVC and CPVC Pipes - Schedule 40 & 80
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    dominicano's Avatar
    dominicano Posts: 1, Reputation: 1
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    #4

    Jul 31, 2009, 01:27 PM
    Schedule 40 in term of PSI , how much is it?
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    massplumber2008's Avatar
    massplumber2008 Posts: 11,871, Reputation: 1114
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    #5

    Jul 31, 2009, 01:43 PM


    Hi Dominicano:

    The info. above is not correct. I think Rick meant to say that maximum temperature rating is 140 F... but not maximum working hydrostatic pressure...

    Cellular core PVC is considered a NO PRESSURE PVC... so not to be used for pressure applications.

    The correct answer depends on the size of the schedule 40 PVC pipe. For example at 75 degrees F, 2" sch. 40 PVC pipe can work with liquid up to 280 PSI, but 3" is only rated for 260 PSI and 4" PVC for only 220 PSI, etc. These are MAXIMUMS and again are NOT for schedule 40 cellular core DWV type PVC.

    Check it out at:

    http://www.charlottepipe.com/Documen...ech_Manual.pdf

    See page #25 of 112...

    Let me know if you need more info...

    MARK
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    kbota's Avatar
    kbota Posts: 1, Reputation: 1
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    #6

    Feb 22, 2010, 08:22 PM
    http://www.engineeringtoolbox.com/pv...ons-d_795.html

    Quote Originally Posted by kbota View Post
    http://www.engineeringtoolbox.com/pvc-cpvc-pipes-dimensions-d_795.html
    Sorry for the double post, but my understanding of pipe schedule is that schedule 120 is extremely heavy wall, sched 80 is heavy wall, and sched 40 is standard wall thickness.
    Sched 20 is that light wall junk that's not even good for making tomato stakes.

    Check out the link.

    K
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    careypr's Avatar
    careypr Posts: 1, Reputation: 1
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    #7

    Mar 16, 2011, 12:59 PM
    What happens to the PVC pipe if the operating temperature is marginally higher than the 140. I am planning on using exisitng piping for heating a pool, but changing the heating source. The specified output temperature of the heat exchanger is 165 degrees.

    Thanks you

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    btwlzyqs's Avatar
    btwlzyqs Posts: 1, Reputation: 1
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    #8

    Aug 7, 2012, 03:41 AM
    Schedule 40 Steel Pipe ,Schedule 80 Steel Pipe

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    Stu Figgs's Avatar
    Stu Figgs Posts: 1, Reputation: 1
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    #9

    Sep 25, 2012, 07:12 AM
    Question.
    SCH 40 NPS 16 - the external diameter is 16", the internal is 15", and the nominal thickness is 0.5 inch?? If I recall my math, from 15 to 16, there's still 1 whole Inch, not half! Haha

    Sorry for the question, I know the answer is going to be dumb, but I really want to know. Can anybody explain?
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    massplumber2008's Avatar
    massplumber2008 Posts: 11,871, Reputation: 1114
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    #10

    Sep 25, 2012, 02:51 PM


    Hi Stu

    To get the external diameter to make sense using the nominal pipe size and the schedule of the wall thickness you need to add the internal diameter to the schedule of the pipe, but need to count the schedule (thickness) of the pipe TWICE to get the overall diameter of the pipe... see image below.

    Mark
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