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B.S. 951 Bonding Clamp.

Zoomup
Good morning,

                           I have often wondered at just what is the purpose of the locking nut on the main fixing screw on a B.S. 951 bonding clamp. On static non vibrating pipes I can hardly imagine the screw becoming loose. So, is the locking nut superfluous? Or is it perhaps to allow correct orientation of the razor blade sharp warning label?


Z.

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  • 0
    Actually the BS951 clamp is not a particularly good design, there were better clamp designs with springs that do not suffer from the thermal loosening, but they are not BSI approved. It is quite possible to fit a BS951 clamp in a way that the screw is tight, but the contact band isn't and it can be very hard to tell by visual inspection (though it becomes painfully clear after a good pull) In that sense a worm drive hose clip would be better..

    It is very telling that most of the DNOs have their own clamping arrangements for pipes and clamp jackets, that are properly sprung and eschew the traditional '951, presumably for this reason.

    I think the lock nut is just a sop to cover  the poor performance.

    In equipment I have designed I do not like them, and try to use almost anything else when contact to pipe or armour is required.

    Constant force springs in various sizes feature quite a bit.

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  • 0
    Actually the BS951 clamp is not a particularly good design, there were better clamp designs with springs that do not suffer from the thermal loosening, but they are not BSI approved. It is quite possible to fit a BS951 clamp in a way that the screw is tight, but the contact band isn't and it can be very hard to tell by visual inspection (though it becomes painfully clear after a good pull) In that sense a worm drive hose clip would be better..

    It is very telling that most of the DNOs have their own clamping arrangements for pipes and clamp jackets, that are properly sprung and eschew the traditional '951, presumably for this reason.

    I think the lock nut is just a sop to cover  the poor performance.

    In equipment I have designed I do not like them, and try to use almost anything else when contact to pipe or armour is required.

    Constant force springs in various sizes feature quite a bit.

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