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A strange situation ... (Read 12277 times)
thescruff
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Re: A strange situation ...
Reply #7 - Nov 13th, 2015, 12:19am
 
The pre-charge pressure is marked on the vessel and usually pre-set
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rgirling
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Re: A strange situation ...
Reply #6 - Nov 12th, 2015, 3:25pm
 
OK, done that. Do I need to pressurise the arrestor (bicycle valve), or will it sort itself out? It's fitted in place of the previous air pipe on a short 15mm stub.

Ray
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thescruff
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Re: A strange situation ...
Reply #5 - Nov 6th, 2015, 10:35pm
 
I would sooner you changed the ballvalve to a brass equilibrium valve first.

You should also check the WC ballvalves
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rgirling
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Re: A strange situation ...
Reply #4 - Nov 6th, 2015, 10:52am
 
The noise happens if none of the CW tank-fed taps are open. Simply cracking open any of the CW tank-fed taps stops the noise at once. I'll replace the pipe with an arrestor ASAP. Thanks to all who responded, much appreciated!

Ray
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thescruff
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Re: A strange situation ...
Reply #3 - Nov 4th, 2015, 9:50pm
 
Headrush wrote on Nov 4th, 2015, 11:00am:
Only thing I can think of would be the WC inlet valve, it fits with the profile of your description. Quick and cheap to replace and will eliminate another suspect..


One type of ball valve is common to make groaning loud noises when the diaphragm is worn
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Headrush
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Re: A strange situation ...
Reply #2 - Nov 4th, 2015, 11:00am
 
Only thing I can think of would be the WC inlet valve, it fits with the profile of your description. Quick and cheap to replace and will eliminate another suspect..
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thescruff
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Re: A strange situation ...
Reply #1 - Nov 4th, 2015, 10:27am
 
Can you make the noise happen. ?.

The air pipe is about the worse thing you could do as it will cause the water to bounce, get a proper shock arrester if anything
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rgirling
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A strange situation ...
Nov 4th, 2015, 9:39am
 
I have a conventional household water system, in that it consists of a storage tank in the loft, an indirect cylinder one floor below and hot and cold taps on the first and ground floors. The central heating is pressurised and separate, but I'm sure that's not relevant.

A while back a noise started, something like water hammer, but different as it would occur every 40 seconds or so and only last for between 2 and 10 seconds. It sounds like a brief but soft engine-revved noise, as opposed to the normal "done-donk-donk" noise of hammer I've heard in the past.

Feeling the pipes running through the airing cupboard, the vibration comes from the pipe that supplies cold water to the storage tank. The rising main stopcock is on the ground floor and there is another mains-pressure supply reaching the kitchen sink. I suppose that tees off the other riser. All other supplies are fed from the storage tank, as far as I can tell.

Now for the strange part: the noise can be stopped immediately by opening (even very slightly) any of the tank-fed cold water taps - NOT the hot taps, just the cold ones. The only way I've found to eliminate the noise is to crack open one of the tank-fed cold taps, but I cannot understand why this is, as there is little pressure in the gravity-fed supply, compared to the mains-fed tap.

I've tried replacing the storage tank ball-valve (three different types), making sure that the connection to the ballcock is as rigid as possible, putting in an air trap at the top of the tank cold supply (teeing a closed-end pipe above the bend to the ball valve) and I thought about replacing the main stop cock, until - when fully shut off, the noise continued! How is that possible?

I don't have that much hair left to pull out, but this is getting ridiculous. Where should I look next, please?

Ray
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