Help please its driving me mad!

[Darren]

Any sudden stop in flow will resonate through a faulty valve. I would be ruling out each toilet fill valve one by one, do you have isolators fitted at each toilet? If so turn them all off and try to replicate the clunk. Do you have a combi or gravity hot water system?

Hi yes I have isolators at each toilet and washing machine, dishwasher and outside tap, noise is always in same place somewhere under floor or in wall. If I open a tap a little at the same time as flushing no noise? I have a ho****er tank that is my thermal store for heating, my hot water is mains pressure heated via coil as it passes through thermal store.

 

[Tonycane]

Turn all thE isolators off and run the cold tap on your sink, does it still happen when you turn the tap off? If not you have a faulty valve in a cistern, open one at a time and repeat running the cold tap.

 

[Darren]

Turn all thE isolators off and run the cold tap on your sink, does it still happen when you turn the tap off? If not you have a faulty valve in a cistern, open one at a time and repeat running the cold tap.

Hi I'll give that ago, it will be tomorrow now as I'm on nights but I'll report back thanks.

 

[Darren]

Turn all thE isolators off and run the cold tap on your sink, does it still happen when you turn the tap off? If not you have a faulty valve in a cistern, open one at a time and repeat running the cold tap.

I've opened my stop tap fully and before isolating toilets checked cold tap full on to off no bang, so I'm thinking that rules out faulty cistern valves? If I run a tap and flush the toilet there is no bang? Shutting my stop tap helps and does get rid of the bang but the toilets take an age to fill and the water pressure is then useless.

 

[Rickster123]

Have you had a shock arrester fitted as suggested earlier?

 

[Darren]

Have you had a shock arrester fitted as suggested earlier?

Hi no not yet, I decide to go with the cheapest option first, new stop tap but that hasn't cured it.The problem has only recently started so not sure why all of a sudden I would need shock arrestor as I have lived here 14 yrs without any issues but if that's the solution then I'll fit them. The only thing is I have 3 toilets, washing machine and dishwasher that all cause this bang so that's about £200 just for the arrestors before fitting, so I was hoping there maybe another solution.

 

[Darren]

Update I've just tried different taps in the house hot and cold and if you slam them off quickly I get the clunk this is the same with all isolaters closed or open?

 

[Masood]

The problem has only recently started so not sure why all of a sudden I would need shock arrestor as I have lived here 14 yrs without any issues.

As already said earlier up the thread, the water carrier may have upgraded the mains, fixed a leak or done other work that has improved your pressure.

 

[Darren]

As already said earlier up the thread, the water carrier may have upgraded the mains, fixed a leak or done other work that has improved your pressure.

Thanks so are you suggesting a pressure reducing valve is the answer or will that just be the same as closing my stop tap to get rid of the bang as that doesn't give me enough supply to make the shower usable.

 

[Rickster123]

Shock arrester

 

[Masood]

Thanks so are you suggesting a pressure reducing valve is the answer or will that just be the same as closing my stop tap to get rid of the bang as that doesn't give me enough supply to make the shower usable.

Shutting the stopcock will have no effect on the pressure. It will only affect flow rate.

 

[Darren]

Shutting the stopcock will have no effect on the pressure. It will only affect flow rate.

Yes that makes sense thanks, so is prv what your suggesting?

Shock arrestors have been suggested but as I uderstand it I will need to fit to all offending toilets etc, is that correct or can one be fitted somewhere.

 

[Masood]

Yes that makes sense thanks, so is prv what your suggesting?

Shock arrestors have been suggested but as I uderstand it I will need to fit to all offending toilets etc, is that correct or can one be fitted somewhere.

If you want a single whole-house solution, try a PRV.

In theory you could fit a single shock arrestor near the banging pipe, but if you can locate and access the pipe to fit an arrestor, you may as well clip it properly and not need an arrestor.

Or - you could methodically isolate and test to find which appliance/tap is wearing out and causing the hammer in the first place.

 

[Darren]

Thanks I will give the latter ago first tomorrow and if that fails try prv as one arrestor isn't an option as I can't access the pipe work making the noise.

 

[Ric2013]

I'm a newb. Don't shoot me.

Would a single shock arrester after the stopcock work? On the grounds that it would give the water somewhere to expand to.

 

[Darren]

Looks fine, set it to 3.0 bar and trial form there

I've gone ahead and fitted the prv, my water pressure was showing 2.5bar once fitted and I've slowly wound it in to 2-2.2bar and bang has gone at last and I still appear to have plenty of flow and pressure at my showers etc. I've only just fitted it so time will tell if all stays good. I have no idea what the pressure has been in the past but maybe it has increased of late by a repair externally as suggested.

Thanks for the help guys and I'll update in a few weeks to let you know if all is still good!

Cheers.

 

[Darren]

Didn't last later that day the bang was back! Not sure if the PRV is faulty though. Set at 2bar with stopcock fully open and taps etc closed, same evening it was reading 3.5bar and the next morning it was reading 1.5bar and no flow at the shower. Set again at 2bar and it was varying between 2.5-1.8bar through out the day. Tonight it was reading 3bar and now is back to 2bar, have I done something wrong or is it faulty?

 

[Alex Knight]

Have you put it on backwards lol

 

[Darren]

Have you put it on backwards lol

Unfortunately no, I wish that's all it was but I did double check.

 

[PlumbBobBob]

no all that is happening is that at different times of the day there is differing demand on the mains i.e. over night there will be less demand so pressure rises and during the day there is more demand so pressure will be lower.