Stopping water hammer... how to?

[Du1point8]

Lovely side affect of the massive burst mains in SW London a few weeks ago and losing all water pressure is that the system seems to have now developed a water hammer when the toilet is flushed.

I want rid of it before any damaged is caused.

The hammer is subdued if the cold tap is left running in the bathroom when the toilet is flushed.

Its victorian flat... toilet has an enclosed cistern (really do not want to take it apart again for the 2nd time in 6 months) and the plumbing is probably from the 80/90s.

Anyone think of what I can do?

Heard people talk of of putting an arrester in there, but where? can this be placed near the boiler or will it need to be near the toilet? Will it actually solve it?

Also it could be the toilet flush valve clogged with sand/grit from the recent mains blow out.

Advice would be grateful.

[Du1point8]

Thing is I dont think we have high pressure according to the boiler pressure gague.

Will double check the OH is not playing with the fking boiler again since I banned her from touching it last time.

[Du1point8]

Neil - YVM said:

Closing the stop cock will not reduce the pressure, just reduce the flow rate.

The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.

You could fit an arrester, but almost certainly the valve is the cause.

Is it a difficult job? Or should I just stump up for a plumber to come round and fix the thing with a £20 kit?

Being the cistern is an enclosed one in a wall? It does have silicon sealant cut out sections at my request (last one grouted everything in making it a bastid to get off)...

What kind of ball park figure would I be looking at to get this done?

[Du1point8]

McWigglebum4th said:

Is there a plumbing fitting with a screwhead in the middle going to the bog?

As this is a ball valve which could be tweaked to reduced flow

Carpet knife comes out tonight to start freeing the tiles to have a look before I lose patience with it and get the plumber out when I get back off holiday.

[Du1point8]

Shaolin said:

Du1point8 said:

Is it a difficult job?

No, surprisingly easy and far less hassle than booking and arranging for someone to come and do it for you - assuming you are able to identify the working end of a spanner.

Going to review the install on the bank holiday monday and forget touching it until then as Im away as of tomorrow and dont need to break it just before I go.