Cold Water Pipe Banging/noise

[greg leece]

We seem to have a bit of a problem with our main cold water pipe feeding the tank in the attic. Whenever we run the cold water, including flushing the toilet and running a shower, the pipe vibrates and makes a banging noise of varying degrees.

With the exception of the kitchen tap (which also feeds the washing machine and garden tap) there are no other "spurs" off this pipe before it reaches the main storage tank in the attic.

I can only assume that somehow air has got into this pipe (we did fit a new tap outside) but am open to other options.

My question is, how do I get the air out/fix the noise and vibration?

Thanks Greg

[shaun]

Ensure that the pipe is clipped down often enough and if so consider replacing the float valve.

[Dave Liquorice]

Freeing off any clips a bit thus allowing the pipe to move a little but still suported is also a means of stopping these resonances. I tried the tighten/fix everything securley route but that just altered the frequency and onset point of the resonance. Making everything slack cured it...

[david lang]

Fit one of these in the pipe somewhere 86348 Flexible Pipe Connector 15mm x

15mm

[Doctor Drivel]

eliminate the problem at source, clipping pipes and replace ball valve in the tank.

[Chris Hodges]

Also adding insulation to the pipes touching a wall or similarly immoveable object helps.

Chris

[john]

Have you left a hose attached to the outside tap? If so (and the tap is on) it acts as a superb hydraulic accumulator and will create hammer - likewise washing machine hoses.

John