Why would this happen???

Gees · 23 Aug 2012

Turned off the hot tap in the bathroom this morning ( combi fed ). About 3 seconds later the flexy pipe feeding the hot tap went "BANG".. Water everywhere... Bathroom was renewed some 3 years ago by a professional fitter.

Untitled

Gees
23 Aug 2012
1

Any ideas other than bad luck with a defective pipe.
I would have hated it to happen when we where on a 2 week holiday. Just imagine the mess...and the gas bill....

Dan Robinson · 23 Aug 2012

My guess would be that it was either a faulty part, or it was stressed on installation and just gave way.

Is the hot tap a quarter turn jobby? If so, years of sudden flexing when the tap was turned off have given it more strain.

Gees · 23 Aug 2012

Dan_Robinson said:
My guess would be that it was either a faulty part, or it was stressed on installation and just gave way.

Is the hot tap a quarter turn jobby? If so, years of sudden flexing when the tap was turned off have given it more strain.

Cheers Dan... No its just a standard tap with a turney handle on the top.
I did fit a longer version as I suspected it may have been under stress. Also it was a lot easier to fit !!

Master of None · 23 Aug 2012

replace with a WRAS approved one. it will probably be better quality.

DP · 23 Aug 2012

I wonder if a check valve or pressure reducing valve has been fitted to the cold water line. Is there a water meter on the cold water line?

Phill Peck · 23 Aug 2012

It was probably all twisted when it was tightened
Check if the one on the cold is twisted

dcawkwell · 23 Aug 2012

If you have a water meter or a non return valve stop cock.
The combi will have filled your hot pipework with hot water.
There will be nowhere for the water to expand into and the pressure
in the pipework will increase rapidly and the weakest point will fail.

A small expansion vessel on the hot pipework is good idea.

Gees · 23 Aug 2012

dcawkwell said:
If you have a water meter or a non return valve stop cock.
The combi will have filled your hot pipework with hot water.
There will be nowhere for the water to expand into and the pressure
in the pipework will increase rapidly and the weakest point will fail.

A small expansion vessel on the hot pipework is good idea.

Now that you mention it there was an odd effect that did happen to this particular tap on one or two occasions in the past.
After using the tap for hot water, when it was turned off and the water stopped. If you then turned on the Cold tap and turned it off quickly the HOT tap would start to run water again. We now have to make sure the hot tap is turned completly off as far as it will go... Also when turning the hot tap off there was a "dunk" noise from the pipework !!

manchestergas · 24 Aug 2012

Was the tap that it was connected to loose to some degree? ie would move from left to right while opening and closing the tap a little?

The braided metal hose on that flex looks like it has failed through fatigue at that point.

Gees · 24 Aug 2012

manchestergas said:
Was the tap that it was connected to loose to some degree? ie would move from left to right while opening and closing the tap a little?

The braided metal hose on that flex looks like it has failed through fatigue at that point.

Absolutly NO movement at all.

mcmoby69 · 24 Aug 2012

was the braided hose rubbing on a tile joint or anything at the back of the basin? could be expansion and contraction causing it to rub against something? just a thought

Charnwood · 25 Aug 2012

The point to the overbraiding is to prevent pressure causing this.
There must have been some sort of 'damage' to the overbraiding or one hell of a pressure surge.

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Why would this happen???

Phill Peck

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