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Discuss Boiler return pipe rattle in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
9
Hi all, hope everyone is doing well.

I just have a quick question:
I have noticed a very annoying rattle in the hot press when the stove with back boiler is on. I rattled the pipes myself to see if I could get the noise to change to no avail.

I discovered the noise coming from what seems to be the boiler return from the hot water cylinder coil. This pipe has a red gate valve that you rotate a couple times to close or open. When I fully close the valve the noise stops. Even a turn before being fully shut the noise decreases.

Could the valve be faulty as in something inside it has broken to cause the rattle? It sounds like there is a tiny ball being vibrated in the same area constantly.

It may not be relevant but I only recently noticed this noise a day or two after I drained my header/expansion tank to clean out debris and replace a leaking float valve.

Any advice at all would be great, thanks!
 

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Messages
9
Hi all, hope everyone is doing well.

I just have a quick question:
I have noticed a very annoying rattle in the hot press when the stove with back boiler is on. I rattled the pipes myself to see if I could get the noise to change to no avail.

I discovered the noise coming from what seems to be the boiler return from the hot water cylinder coil. This pipe has a red gate valve that you rotate a couple times to close or open. When I fully close the valve the noise stops. Even a turn before being fully shut the noise decreases.

Could the valve be faulty as in something inside it has broken to cause the rattle? It sounds like there is a tiny ball being vibrated in the same area constantly.

It may not be relevant but I only recently noticed this noise a day or two after I drained my header/expansion tank to clean out debris and replace a leaking float valve.

Any advice at all would be great, thanks!
Also noticed, as soon as the circulation pump turns off behind the stove in the kitchen, the rattling stops immediately in thr hot press!
 
Messages
9
So I went and replaced the gate valve but to no avail, its still making the same annoying rattle, there are no loose fittibgs or pipes.

I will upload a video if anyone has any ideas?


The noise is only there when the pump behind the stove is switches on to pump water.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Messages
26,947
Coil vibration normally happens when the pump is too strong going through the cylinder

what’s the pump speed on ?
 
Messages
9
Coil vibration normally happens when the pump is too strong going through the cylinder

what’s the pump speed on ?
The pump is on speed 2, the noise has only begun a couple days before my initial post so other than that the noise wasn't there and nothing else was changed.

I put a screwdriver to the non return valve at the botton of the photo above and the noise seems applified there once I do so. Im unsure if it is a flap or spring type valve, could this be faulty internally?
 
Messages
172
If you close the gate valve down to when the noise disappears, perhaps there will still be enough flow to heat your water? If flow through the coil is too high you get very high return temperatures at the boiler and reduced efficiency.
 
Messages
9
If you close the gate valve down to when the noise disappears, perhaps there will still be enough flow to heat your water? If flow through the coil is too high you get very high return temperatures at the boiler and reduced efficiency.
I tried that but it was near closed before it would stop.

I went ahead and replaced the non return valve and the noise is now gone thank god. Bit of a nightmare, drained the entire system but couldn't empty the water back to the boiler for some reason, mainly due to the fact there is no drain valve at the back of the stove so I drained what I could via the hotpress and ended up having to change the valve live, pop the old one off and pop the new one on in a panic haha.

Job sorted now so thanks for the advice everyone, appreciate it.
 

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