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  1. #1
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    Bolted Flange Chilled Water Joints (UK)



    Can someone direct me where to find some information on the above.

    I would like to know if there is a 'standard' which dictates the minimum number of exposed threads on a bolt of a flanged pipe joint.

    I would also like to know if bolt torques in this application are specified anywhere. Are these generally applied, or is a general degree of 'handtighness' acceptable.

    Thanks.



  2. #2
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    Re: Bolted Flange Chilled Water Joints (UK)

    Does this help at all?
    http://www.buystainless.co.uk/produc...c/nut-bolt.htm

    I think that the correct torque setting is two loud grunts, one on each spanner.
    Brian - Newton Abbot, Devon, UK
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  3. #3
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    Re: Bolted Flange Chilled Water Joints (UK)

    Thanks, Brian.

    That's a useful table, but doesn't give me what I'm looking for.

    As for the torque, I think you are spot on !

    Anyone else ?

    Thanks

  4. #4
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    Re: Bolted Flange Chilled Water Joints (UK)

    It's fun playing with Google and Wikipedia...

    You are looking at/for EN ISO 4753 but I haven't found a free copy yet.

    There is an engineering forum which has discussed this and one thread (pun) which may answer your question is here..
    http://www.eng-tips.com/viewthread.cfm?qid=57019

    Basically it seems that you should have one thread diameter length through the nut.
    Brian - Newton Abbot, Devon, UK
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    Re: Bolted Flange Chilled Water Joints (UK)

    A mate of mine who did an apprenticship at a dockyards remarked to me once that he was taught that there should be 2 threads poking out the end. Funny but I never thought I'd ever have the need to pass that nugget of infomation on.
    As for the tightness I believe there are generic torque settings for certain pitches and materials. Not looked but I suppose the mighty Interweb will have it somewhere. If there is oil/grease on the threads then the final tightness will be tighter than a dry thread. Friction and all that jazz.

    As Brian says though, a Jackson Overtorque should do it.

    Cheers,

    Andy.
    Last edited by Tayters; 19-04-2011 at 11:39 PM. Reason: Grease is the word.
    Health and safety first..........unless I'm in a hurry.

  6. #6
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    Re: Bolted Flange Chilled Water Joints (UK)

    Thanks Guys. I'll try and find those standards quoted. In the meantime, I've found that the HVCA (Heating and Ventilation Contractors Association) have a publication on this topic which calls for two threads protruding from through the nut. This is consistent with other answers here.
    Thanks again.

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