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What is causing water hammer in my flat?

M

Mr Gwent

What is causing water hammer in my flat?
Hello

I wonder can anyone shed any light on what is becoming an annoying problem?

I had a new stopcock installed in my second floor flat a year ago. This was intended to stop water hammer which had been taking place. However, recently the water hammer has returned and from what I can tell it occurs when water is used in the flat below mine, and possibly in other flats as well. The noise is a banging or crunching of metal sound and it can be quite loud.

But, I cannot work out is why this is happening, and this is where I seek advice. Could the water hammer, if that is what it is, be the result of a vibration in the pipes because of water usage, water pressure or an air gap? If this is so, where might it be occurring?

Water in my flat is delivered via a dedicated pipe which rises through the building. This pipe is, as far as I know, isolated from the other flats which have their own respective pipes. Whether these pipes branch from a common supply which connects to the mains, or if they are connected directly to the mains, is not something I know.

Any advise would be appreciated ...

Thanks

Mr Gwent.

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