Loud banging coming from under the kitchen floor

[DarrylAber]

Hello to all. For the past few months we have been getting loud banging from under the kitchen floor just before the boiler kicks in. Is so loud that you can feel it. It only realy started after a vaillant engineer came out to replace a leaking valve on the central heating flow out pipe at the boiler. I bleed the radiators twice a month and each time theres air in the same two radiators. Not much, just a small amout. All the radiators get warm with no coldspots.
The stopclock is under the sink in the kitchen and if you hold the pipe that runs to it when the noise starts u can feel the whle pipe kick.

Any ideas or fixes.

Many thanks Darryl.

 

[HERTS P&D]

Loose pipe work, lift up the floor and secure the pipes.

Andy

 

[DarrylAber]

Loose pipe work, lift up the floor and secure the pipes.

Andy

Cheers andy. The kitchen floor being tiled means im unable to get under there properly lol.

Surly that cant be all it is. It never made that noice till the part was replaced.

 

[petertheplumber12]

The cause of noise is called water hammer, when a pipe is loose that is were the water hammer is converted to violent pipe movement which makes it bang. Washing machines and dishwashers have solenoid valves to turn the water supply off to the machine, this sends a shock wave along the water in the pipe, (water hammer). If there is air in the water it softens the shock. No air, water hammer, fixing pipe securely is the best answer. Check the auto air vent cap in the boiler is undone a turn to let air out of water, that may stop rads needing bleeding.

 

[DarrylAber]

The cause of noise is called water hammer, when a pipe is loose that is were the water hammer is converted to violent pipe movement which makes it bang. Washing machines and dishwashers have solenoid valves to turn the water supply off to the machine, this sends a shock wave along the water in the pipe, (water hammer). If there is air in the water it softens the shock. No air, water hammer, fixing pipe securely is the best answer. Check the auto air vent cap in the boiler is undone a turn to let air out of water, that may stop rads needing bleeding.

Thank for your reply. Looks like its a trip under the floorboards for me then. Lol.


Cheers guys for your advice. Much appreciated.

 

[duffin]

did the plumber touch the stopcock? if so, try turning it down a little- possiblystop or reduce the hammering.

 

[Slugbabydotcom]

Or you could try one of THESE
Just fit it on the cold water service.

You will also need a 15x15x1/2" Tee, something like this


Oh and some PTFE tape to seal the threaded joint

 

[hazetimesfive]

is the time correct on your stopclock?

 

[RigidRaider]

When did you last see your wife / child / granny?

 

[DarrylAber]

is the time correct on your stopclock?

So im guessing thats not what its called. Excuse me for being wrong.

 

[DarrylAber]

When did you last see your wife / child / granny?

What the hell you on about.

 

[Armo74]

Are you sure it's happening just when the boiler kicks in? The cause maybe a faulty tap washer or a faulty ball cock if you have an open vented system. The problem with water hammer if your not careful it can encourage leaks on dodgy joints if the vibration gets bad.

 

[DarrylAber]

Are you sure it's happening just when the boiler kicks in? The cause maybe a faulty tap washer or a faulty ball cock if you have an open vented system. The problem with water hammer if your not careful it can encourage leaks on dodgy joints if the vibration gets bad.

Hi armo74. Its at its mostly violent when the boiler kicks in but it does make a slight noise when u turn the kitchen tap off and the barthroom taps but the noise is fron under the kitchen floor.

 

[ivixor]

Sure the fitter didn't put the valve on the wrong way round? That can cause a terrible hammering/buzzing sound.