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Discuss What is meant by the term a 'Pupped' fitting? in the Fittings & Pipes area at UKPlumbersForums.co.uk.

  1. GasAt300Bar

    GasAt300Bar Member

    What is meant by the term a 'Pupped' fitting?

    I was looking thru' a fittings catalogue and saw if my heart desires, I may have my fitting 'Pupped'. Compression fittings I get, Yorkshire, Essex, Surrey etc I understand, and end-feed I like.

    But 'pupped'? I've searched t'interweb and can find sellers. Problem is, these give no clue as to what makes these 'pupped'. I get the feeling these fittings are heat-welded, but I'm not clear. But, fittings get called all sorts of unfathomable names?
    I get the idea it's something I won't ever see, but I'm the sort that likes to know this stuff anyway.

    Must get out more.
    Last edited: Feb 9, 2019
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Any chance of a pic of said fitting ?
  3. Gasmk1

    Gasmk1 GSR

    Looking at the sites I think it is that they will weld up plastic fittings for you don't know what pupped means though
  4. GasAt300Bar

    GasAt300Bar Member

    Yes, that bit i get... I think? Seems these are used in water mains/ gas mains. Look like super-duper welded fittings. Here's a seller. I see they are a step-up on me lashing in a sink-waste with solvent, but why are they 'pupped'?

    Pupped Fittings Black - GPS
    • Optimistic Optimistic x 1
    Last edited: Feb 9, 2019
  5. bogrodder

    bogrodder Plumber GSR

    I’d hazard a guess it’s a typo and suppose to say ‘ pipe fittings ‘
  6. Chuck

    Chuck Well-Known Member

    A 'pup' is short piece of pipe that joins two fittings. Hence, a 'pupped' fitting is one that comes with pups attached already. I'm not sure of the origin of the term, oil industry I suspect and definitely more 'commercial' than 'domestic' plumbing.

    Anyway, Google 'pup pipe' rather than 'pupped' and you'll get lots more hits.
  7. snowhead

    snowhead Plumber

    It'll be an Amercian term originally;

    From Here;Pipe Spools / Pup min. lengths - Pipelines, Piping and Fluid Mechanics engineering - Eng-Tips

    The question:
    What is a Pup Piece?"

    My answer:
    What is it?
    Okay let's see if we can answer this question once and for all.
    In piping we all know we have two basic situations; one is Fitting-to-Fitting and the other is not Fitting-to-Fitting.
    With the first, there is nothing between one fitting and another except the weld. Therefore we call it "Fitting-to-Fitting or "Fitting make-up"
    With the second, the required overall dimension does not allow for Fitting-to-Fitting configuration. We then have an ELL, gap, ELL or ELL, gap, Reducer, ELL or ELL, gap, Flange or ELL, gap, reducer, flange or some combination of standard fittings BUT not Fitting-to-Fitting. There is that short gap between two of the fittings. This is an all too common natural occurrence in piping design.
    This short gap is where a piece of pipe must be placed (cut, beveled, fitted and welded) to connect the two fittings that don't touch. The short piece of pipe is called a "Pup" piece. The piece of pipe or "Pup" can be pretty much any length however when it gets to be around a foot in length it is no longer called a "Pup". A long piece of pipe is just a piece of pipe. The really short ones are called a "Pup".
    The only restriction for the length pf a "Pup" piece is common sense or a company imposed minimum length. This minimum length is defined in different ways by a Lead Design Supervisor or company and there is no absolute Code restriction or commonality. Individual pipers or a company minimum may consider the pipe wall thickness, the weld bevel, the heat effected zone, or the real or perceived ability of the shop to make a weld. There is no magic rule and there is no common industry standard.
    In referring to the proximity of butt welds in pipe. This question has been asked many times. The answer is the piping Codes do not provide specific guidance. In this situation, you must use engineering judgment such as, locate the butt welds as far apart as possible to avoid overlapping weld "heat affected zones" and stress concentration effects. For girth weld spacing, a criterion that has been used for many years is: the greater of 2 inches or 4 times the wall thickness.
    You might also want to talk to a good Welding Engineer as it could be dependent on the actual welding process. If this is for proximity of weld joints to one another there could be other concerns--again the Welding Engineer could help you.
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  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    • Agree Agree x 1
  9. GasAt300Bar

    GasAt300Bar Member

    Ah, thank you. If I'd known... forehead smackingly simple really. Only I was searching for 'pupped'. Look-up a 'pup' and all is revealed. Definitely more related to oil industry stuff, we're not going to find this doing anything in domestic work soon!

    And thank you for the obvious effort you put into a proper answer.
    • Like Like x 1
  10. GasAt300Bar

    GasAt300Bar Member

    In short: A "Pup" is for 'bigger-boys' than me. Terminology for a short piece of butt-weld piping. As the man said, search 'pup pipe' instead of 'pupped' and you'll see lots on it.
    • Like Like x 1
    Last edited: Feb 10, 2019
  11. skoronesa

    skoronesa Member

    As a plumber in the us I have never heard of pupped fittings or a short piece of pipe called a pup. We call short pieces nipples. Nipples come factory threaded up to 7". After that the supply house would have to cut you one custom. We call anything shorter than a full stick a nipple.

    I have to agree with most of you that this is a term for welded steel pipe.
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