Banging pipes

[livinginrubble]

Please forgive me if this has already been covered but I cant find anything in search.

I've had a new boiler installed after the last one gave up the ghost and it's a damn sight more powerful than the one I had previously.

Ever since, the pipes have been making a (sometimes) very loud banging noise. To the point it can make me jump even if I am in the next room.

I have been told by the guy who installed the boiler that it will just "go away", needless to say, after that I had the boiler he installed checked over as I lost complete confidence in him after that.

I have also been told to tie the pipes together with wire or to the joists. I'm not convinced on that one either.

and last but not least...run a length of hosepipe from the cold water tap in the kitchen to the hot water tap in the bathroom and turn both taps on.

Now, before I get a length of copper piping to wrap around these "plumbers" necks for treating me as if I was born yesterday, can someone please for the love of god, tell me if any of these are true, and if not - what can I do about them?

Thanks in advance,

Livinginrubble (and banging pipes)

 

[Jordon]

Umm ok to start what boiler is it? And what type of system? Combi, reg, system etc???

 

[livinginrubble]

Umm ok to start what boiler is it? And what type of system? Combi, reg, system etc???

Glow worm, combi, dont know about the other two.

 

[Jordon]

Ok was it a combi before the new one was fitted?? Is the banging on heating or domestic water- hot cold?? Have new trv's been fitted?

 

[livinginrubble]

Ok was it a combi before the new one was fitted?? Is the banging on heating or domestic water- hot cold?? Have new trv's been fitted?

Yes it was a combi before, the banging as far as I can tell is the hot and cold water pipes I do think it's more the hot water pipe... I have no idea what TRV's are to be honest. Sorry.

 

[cumbriahandyman]

TRV

 

[Jordon]

Sounds like water hammer either unsupported pipes or may be a tap that you turn off quick mostly ceramic type taps do this, is it whilst you use the water or when all is still?? May even be the preheat hasnt been turned off on the boiler so when you first turn it on the hot expansion causes it to rattle, the cxi 2 glowworms I have had the exchanger in the boiler rattling but glow worm say it nothing to worry about! Try telling a client that?!

 

[livinginrubble]

Sounds like water hammer either unsupported pipes or may be a tap that you turn off quick mostly ceramic type taps do this, is it whilst you use the water or when all is still?? May even be the preheat hasnt been turned off on the boiler so when you first turn it on the hot expansion causes it to rattle, the cxi 2 glowworms I have had the exchanger in the boiler rattling but glow worm say it nothing to worry about! Try telling a client that?!

The baning happens at all times when taps are used and when they are not. I do not have ceramic taps so I do think it could be that the pipes need more supporting. I'll give that a go when I get the support clips and a decent drill to put them into the walls.

I'll let you know it that works or not.

Thanks everyone.

 

[Jordon]

Even when it's off interesting? Ok was the old combi coverted from a cylinder and boiler originally?? As said it could be the preheat on the combi, did the installer ever turn it off? You should be able to tell if the boiler comes on every now and then with the heating and hot water off? If it was a conversion originally then if the preheat is on may be causeing a bit of expansion on the pipe and rattling a old dead leg from a old cylinder connection to were it's capped? Last but not least do you have a push button type toilet? If you do does the water stream down the pan (makes the water in the bottom move) as this can also cause the hammer if I runs a little then drops the valve a little and fills abit.

 

[John506]

Just try and trace the location of the banging and as you said put more clips on at least 1 meter apart, use the ones that snap over the pipe for extra support. Don't use wire, use propper clips only.

If after you do this, you still have a slight banging noise (you can still get water hammer with adequately clipped pipework), you can fit a shock arrestor on the pipework, which is basically a small expansion vessel. When you immediately turn off the tap, the water that would usually shunt against the disc in the tap and rattle the pipes, would be taken up by the diaphram in the shock arrestor instead.

Shock Arrestor