Plumbing question
19 September 2002, 08:03 PM
#5
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i think thats because the pipes arent secured propery. When you close the tap the pressure increase causes the pipe to judder.
i stand to be corrected.
i stand to be corrected.
19 September 2002, 08:07 PM
#6
Tis not air its a pressure surge (hammer) going through your pipes. When you shut the tap off (esp. when doing it quickly), the pressure wave coming up he pipe rebounds off the tap and turns to mechanical energy and shakes your pipes to bits.
Look for any pipes that move when it happens and screw them firmly to the wall.
Then get onto your water co. and get them to lower the water pressure.
Nick
Look for any pipes that move when it happens and screw them firmly to the wall.
Then get onto your water co. and get them to lower the water pressure.
Nick
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20 September 2002, 10:03 AM
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You can also sometimes get this problem if your mains stop valve (sorry couldn't say **** now could I?) is not open enough or is fitted the wrong way around.
If you are not talking about mains cold but tank fed cold you could try connecting a hose between a mains cold tap and the 'noisey' tap. The higher mains pressure will usually push any trapped air back up the pipes into the tank, be careful though as you can get very wet if the hose comes off. Turn the tank fed tap on first then the mains (carefully), run it for a few seconds then turn the mains off then the tank fed.
If you are not talking about mains cold but tank fed cold you could try connecting a hose between a mains cold tap and the 'noisey' tap. The higher mains pressure will usually push any trapped air back up the pipes into the tank, be careful though as you can get very wet if the hose comes off. Turn the tank fed tap on first then the mains (carefully), run it for a few seconds then turn the mains off then the tank fed.
21 September 2002, 10:12 PM
#12
Wooops 
I must choose my words more carefully.
Yes, screw the pipe (via a bracket) to the wall.
Hammer is becoming rarer as more water companies use pressure management to reduce their water leakage problems.
But household washing equipment with solenoids can still cause hammer with their sharp on/off action if they are not matched to the type of pressure that their supply has.
As already said, screwing down the main stop **** (inside the house or the street) will cause a high pressure headloss across the tap and reduce any occurrence of hammer. However, if you need a lot of water then you may be starved of flow.
I must choose my words more carefully. Yes, screw the pipe (via a bracket) to the wall.
Hammer is becoming rarer as more water companies use pressure management to reduce their water leakage problems.
But household washing equipment with solenoids can still cause hammer with their sharp on/off action if they are not matched to the type of pressure that their supply has.
As already said, screwing down the main stop **** (inside the house or the street) will cause a high pressure headloss across the tap and reduce any occurrence of hammer. However, if you need a lot of water then you may be starved of flow.
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