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  1. #1
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    Unhappy When is 225 PVC pipe not 225mm?

    I've just arrived back at the shed with 6 metres of Vinidex 225 PVC stormwater pipe. To my dismay, the o.d. is 247mm and the i.d. is 237mm.

    Can anyone tell me what gives? Maybe I bought the wrong type of pipe...

    mick

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    Quote Originally Posted by Glider View Post
    I've just arrived back at the shed with 6 metres of Vinidex 225 PVC stormwater pipe. To my dismay, the o.d. is 247mm and the i.d. is 237mm.

    Can anyone tell me what gives? Maybe I bought the wrong type of pipe...

    mick
    That's correct. It's been discussed a number of times on the forum.
    Same as 150 mm stormwater is not 150 but 154 mm ID and 160 mm OD.

    See PVC PIPE - STORMWATER PIPE - Pipe Online - Retic Fittings , Plumbing Fittings, Reticulation Supplies supplied Australia wide

  3. #3
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    G'Day Mick from my memory of engineering specifications....

    Pipe sizing is measured by Nominal Bore with then the wall thickness is determined by the class of the pipe, ie, pressure rating.

    Tube sizing is measured by Outside Diameter with then the wall thickness is determined by the class of the pipe, ie, pressure rating.

    That my not be of actual assistance with this current issue of yours, but it's good to know and remember...
    Cheers, Peter

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    Hi Glider

    There can be three simple answers to your question:
    • As Crowie says, pipe is measured on internal bore and tube is measured on the outside,
    • Imperial pipe may be rebadged as metric by halfwits, and
    • Some companies are run by halfwits.



    Cheers

    Graeme

  5. #5
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    Quote Originally Posted by Glider View Post
    To my dismay, the o.d. is 247mm and the i.d. is 237mm.
    Why the "dismay"? AS long as all the fittings and junctions fit does it really matter?

  6. #6
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    Quote Originally Posted by graemecook View Post
    hi glider

    there can be three simple answers to your question:
    • as crowie says, pipe is measured on internal bore and tube is measured on the outside,
    • imperial pipe may be rebadged as metric by halfwits, and
    • some companies are run by halfwits.
    All PVC is strangely sized - its been that way for decades
    Here is chart of PVC pressure pipe - there is only one size that seems to be close to what its name indicates

    Screen Shot 2019-11-15 at 2.30.22 pm.png

  7. #7
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    Quote Originally Posted by BobL View Post
    Why the "dismay"? AS long as all the fittings and junctions fit does it really matter?
    Yes, it does actually. The intake to the U.S. made cyclone is 225mm. with little room for packing. Sure, it can be packed out and it will be. Nevertheless, if something is stamped and sold as 225mm, it's not unreasonable to expect that it be true to label; or at least close. BTW, I agree with Graeme Cook.

    I might add that the people at the plumbing supplier didn't believe it was off size. It was only when they saw the physical measurement that they were astounded.

    mick

  8. #8
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    Mick, What about using a flexible repair joint as an adapter? Cheers
    225mm Flexible Rubber Connector Suit Pvc Copper Galv CI - Flexible Rubber Connectors - FLEXIBLE CONNECTORS

  9. #9
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    Thanks Peter. I think you're onto something there. Fifty strokes of the lash ain't cheap for a bit of moulded rubber but it'll do the job by the looks of it.

    Much appreciated,
    mick

  10. #10
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    Quote Originally Posted by Glider View Post
    Yes, it does actually. The intake to the U.S. made cyclone is 225mm. with little room for packing. Sure, it can be packed out and it will be. Nevertheless, if something is stamped and sold as 225mm, it's not unreasonable to expect that it be true to label; or at least close.
    Which US made cyclone uses mm?

    PVC ducting labels was not mean to be actual but "indicative" or "nominal" sizes like a label. In the same way as "gauge" numbers ,or numbered drill sizes, or even like a car speedo which can be up to 10% out.
    The plumbing and mechanical world is full of these oddities, eg BSP taps and dies sizes are quite different to their actual sizes, same with BSW spanner sizes.

    Working with these materials for some 40 years I found it easier to just work with the labels and get on with the job as expending excess energy blowing brain fuses just ground me down for no good reason.

  11. #11
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    fwiw, US made cyclones don't fit US plumbing pipe sizes, which, like yours, are trade sizes not actual dimensions. They sometimes fit HVAC duct sizes but not always. Rubber adapters, often called "Ferncos" here, are a common requirement.

    Are your dimension lumber sizes actual dimensions? Here they're not. For example, a 2x4 is actually 1.5"0x3.5".
    Dave

  12. #12
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    Quote Originally Posted by BobL View Post
    Which US made cyclone uses mm?

    PVC ducting labels was not mean to be actual but "indicative" or "nominal" sizes like a label. In the same way as "gauge" numbers ,or numbered drill sizes, or even like a car speedo which can be up to 10% out.
    ClearVue Max.

    The original size was probably intended to be compatible with an imperial sized earthenware pipe. Indicative sizes are fine but adding mm. to the description certainly misled me and probably others in the future. Thank goodness for the forum.

    Quote Originally Posted by dmorse View Post
    fwiw, US made cyclones don't fit US plumbing pipe sizes, which, like yours, are trade sizes not actual dimensions. They sometimes fit HVAC duct sizes but not always. Rubber adapters, often called "Ferncos" here, are a common requirement.

    Are your dimension lumber sizes actual dimensions? Here they're not. For example, a 2x4 is actually 1.5"0x3.5".
    Great to hear from a Hoosier! Thanks for the inside info. I suppose the U.S. extractor makers have their reasons. Crowie's "Fernco" solution is neat.

    Our old 4x2s are now 90x45 in dressed timber and are true to size in my limited experience. Our hardware market is full of adaptations from the old imperial days principally because so many components are imported from the U.S. I have lots of fond memories of my years in NYC discussing imperial/metric with the guys at the local hardware store. Only the ex-military people agreed with me.

    mick

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    Hope this helps with understanding.

    CONFIDENTIAL
    To: All Staff
    (Include any others on this list to whom this memo should be addressed.)
    From: Your CEO
    Re.: Concerns about Compliance with OSHA Prohibitions against Retaliation
    I am concerned about how the recent situation is being handled. Unless I am unaware of additional information or documentation related to this matter, I recommend that we revisit the situation related to this matter, and seek technical assistance to ensure that we have not made any errors in violation of laws that prohibit unlawful retaliation.
    We share a strong commitment to the consistent application of all policies as well as legal compliance with all relevant city, state, and federal laws related to E&OE laws. I know we share a commitment to prevent liability exposure as well as personal liability exposure.
    The resources below are free and available to us to use at any time. My membership in the School of HK’s provides free information, white papers, case-law information, and cutting-edge research capabilities along with toolkits for how to best handle E&OE and SH-related issues. I recommend that we use these resources in the future to ensure legally complaint decision-making processes related to E&OE and SH issues.
    1 All pipe is to be made of a long hole, surrounded by metal or plastic centered around the hole.
    2 All pipe is to be hollow throughout the entire length. Do not use holes of different length than the pipe.
    3 The I.D (Inside diameter) of all pipe must not exceed the O.D (Outside diameter) otherwise the hole will be on the outside.
    4 All pipe is to be supplied with nothing in the hole so that water, steam or other stuff can be put inside at a later date.
    5 All pipe to be supplied without rust – this can be more readily applied at the job site
    6 All pipe over 153m (500ft) in length should have the words “Long pipe” Painted on each end, so that the contractor will know it is a long pipe.
    7 Pipe over 3.2km (2 miles) in length must also have the words “long pipe” painted in the middle, so that the contractor will not have to walk the entire length of the pipe to determine weather or knot it is a long pipe.
    8 All pipe over 150mm (6” ) in diameter must have the words “Large Pipe” painted on it so the contractor will not mistake it for a small pipe.
    9 When ordering 90 degree, 45 degree or 30 degree elbows, be sure to specify right or left hand, otherwise you could end up going the wrong way.
    10 Be sure to specify to your vender whether you want level, uphill or downhill pipe. If you use downhill pipe for uphill use, the water will flow the wrong way.
    11 All couplings should have either right or left hand threads, but do not mix the threads otherwise, as the coupling is being screwed on one pipe it is unscrewing from the other end

    Cheers
    John T

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    Quote Originally Posted by Glider View Post
    ClearVue Max.
    Don’t they use an 8” inlet?

  15. #15
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    Quote Originally Posted by Colin62 View Post
    Don’t they use an 8” inlet?
    The i.d. is about 210 and o.d. 225mm. 8" may be another of those nominal sizes.

    mick

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