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Banging pipes - blocked separator?

Discussion in 'Plumbing and Central Heating' started by Doc955, 20 Jan 2012.

  1. Doc955

    Doc955

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    Hello all,

    Our CH has recently started making quite voilent banging noises from the boiler/pump/valve pipework. It only seems to do it when the system is getting up to full temperature but there is sometimes also a single big bang as soon as the CH valve closes.
    It's an open S plan with std issue BG valves (Drayton), BG multihead pump (on pos 3), Potterton Promax 24HE boiler feeding 12 rads. It has a combined F&E pipe (22mm) which comes off the air separator (28mm).
    A couple of rads were replaced recently (October) and following this the system was flushed with X400 for about a month which removed plenty of sludge. Once flushed through, it was refilled and X100 added. I fitted a Magnabooster2 at the same time.
    The separator and about 200mm of the F&E pipe will hold a magnet which means it's full of magnetic debris, correct? Could this be the source of the noise and is there any effective way to clean it or is it a chop-out-and-replace job?

    Thanks.
     
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  3. gas112

    gas112

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    Yep creating a restriction and not letting the water get away from the boiler quick enough so gettin too hot.
    Needs cutting out.
     
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