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Best pipe thread type to use in harsh conditions

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  • 04-10-2018 7:09am
    #1
    minnow
    Registered Users Posts: 202 ✭✭


    I have a project where we need to install a 4” Sch 40 pipe in a vessel with harsh chemical (caustic) conditions (inside and out). To make the pipe removable for maintenance, we need to build in a threaded connection in the 4” pipe.

    There is concern about using a fine thread which may be sensitive to the conditions and become stuck and we would like to suggest a chunkier, more robust thread. Has anybody such experience or can recommend a certain thread?

    A 3” NPT thread was the original suggestion from our contractor.

    Many thanks.


Comments

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    #2
    T5180
    Registered Users Posts: 64 ✭✭T5180


    Why is it essential to use a thread ? a flanged joint is far superior on diameters above 1/2" or 1".


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    #3
    lau1247
    Registered Users Posts: 2,141 ✭✭✭lau1247


    What sort of pressure are you looking at? I'm assuming you are looking at threaded connection because you want to avoid welding on end connections?

    I agree, npt is not great in general.

    Have you look at hub and clamp connection? The likes of grayloc hub (there are other manufacturer out there) may be suitable for what you need.

    West Dublin, ☀️ 7.83kWp ⚡5.66 kWp South West, ⚡2.18 kWp North East



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    #4
    minnow
    Registered Users Posts: 202 ✭✭minnow


    T5180 wrote: »
    Why is it essential to use a thread ? a flanged joint is far superior on diameters above 1/2" or 1".

    I should have mentioned, it needs to pass through a restriction, so must be flush, or as close as possible. No room for a flange.


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    #5
    minnow
    Registered Users Posts: 202 ✭✭minnow


    lau1247 wrote: »
    What sort of pressure are you looking at? I'm assuming you are looking at threaded connection because you want to avoid welding on end connections?

    I agree, npt is not great in general.

    Have you look at hub and clamp connection? The likes of grayloc hub (there are other manufacturer out there) may be suitable for what you need.

    The issue is that it will be installed through a restriction which requires the pipe to be flush.


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