A problem with my plumbing... advice appreciated.
I was sitting watching the TV last night. Central heating off. All
water taps off. Washing machine off. Everything off.
The plumbing in the kitchen sink gave a short, loud rattle. This was
repeated roughly every 15 mins. Also, the washing machine vibrated a
couple of times!
This carried on into the night until I turned off the stop cock under
the sink. Also closed the CH boiler down. Still got a few gurgles in
the plumbing, though.
To me it sounds like the mains pressure is high and trying to force
its way in!
Any tips on diagnosis/fixing this are appreciated.
It sounds to me more like fluctuating mains pressure - coupled with some
"springyness" in your system - rather than high pressure per se.
Is there a nearby large user of water, who may have been turning his flow on
and off frequently?
If it happens again, try to reduce any compressibility in your pipework by
turning off the supply to things like flexible washing machine hoses.
The water pressure earlier in the week was very weak. I couldn't get a
bowl full of hot water for my morning wash. I figured that work was
being carried out nearby. Cloudy water when I got back that evening
seemed to confirm this.
Water pressure was OK for 2 days, then the last 2 nights I get the
very_loud pipe bangs.
My planned course of action:
* Turn the stop-cock only half on to get a reduced water pressure.
* Investigate the washing machine connections.
* Investigate the WC -- this is the only thing I can think of that
will "shut off" after the event.
* Stick some towels round the pipes under the kitchen sink.
* Hope it goes away!
If your water has been turned off externally, you may well have some trapped
air in some of the pipes - which will cause vibrations when further pressure
fluctuations occur. For example, air can be sucked in through an upstairs
open cistern ball valve when you open a downstairs tap.
To get rid of the air, you need to run each cold tap in turn until it runs
without spluttering, and then do the same at every cistern, header tank ball
valve and washing machine connection.
A reduced flow means the increasing pressure once you've turned a tap
off will increase slower than if you have full flow. The end pressure
will be the same, it just takes marginally longer to get there.
FWIW, my washing machine shuts off water very abruptly, causing a loud
clonk/bang. I didn't think this was too good. And the time the cistern
filling valve decided to explode and spray water everywhere (even
managing to dump large quantities out despite the lid being tightly on)
convinced me turning the stop-cock partially shut was a good thing.
Net result, less severe shutting off of water. Still full pressure, but
like I said, pressure doesn't increase so instantaneously as it did before.
The pressure went down and then up and the water cloudy. Is it more
pressure than usual? Dirt could have been pushed into your system too and
this is on the washing machine valve seats, allowing water to seep through.
You could install a filter strainer and pressure reducer after the stop
cock. then no problems. I think you should do this anyhow. When a washing
machine line bursts, you know it.
Harry, see my reply above. Say the work was done on Monday, water was
OK for 2 days, would trapped air still come through?
Say I have trapped air in my pipes. Any way to get it out -- just
flush the WC a few times, run the cold taps etc.?
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