Slow leak in sealed water system
6 years ago we went from 'normal' tank-in-the-loft water system to
pumped & pressurised. Fine - wish we had done it years ago. After 18 months the pump cycled too quickly. Plumber came back & with tyre pump re-pressurised the blue bomb pressure vessel. A good man - no charge. 18 months later I knew what to do & did it. Now the re-pressurising lasts only 2 or 3 months. I assume a holed diaphragm. Before buying a new pressure vessel is there anything I should look for or do to salvage the system or prevent the same occuring again? Thanks Phil |
Slow leak in sealed water system
PFO wrote:
6 years ago we went from 'normal' tank-in-the-loft water system to pumped & pressurised. Fine - wish we had done it years ago. After 18 months the pump cycled too quickly. Plumber came back & with tyre pump re-pressurised the blue bomb pressure vessel. A good man - no charge. 18 months later I knew what to do & did it. Now the re-pressurising lasts only 2 or 3 months. I assume a holed diaphragm. Before buying a new pressure vessel is there anything I should look for or do to salvage the system or prevent the same occuring again? Thanks Phil first queation is what pressure did you apply and what was the pressure on the water side? if you dont know then that may be your problem, if there is a hole in the diaphragm then you WILL get water OUT of the pressure in valve/charge valve if not the you could be losing pressure somewhere else, pressurize the vessel then use leak detector fluid to pinpoint and defects in construction then use any insurance or warranty to get it fixed?????? |
Slow leak in sealed water system
Thanks Gav. The pumped pressure is set to sit at 3bar. Normally the
pump cycles on again at 1bar. Over time to pressure drops from 3 to 1bar more and more quickly. After running down the pressure, by opening a tap with pump shut off, applying the tyre pump to re-pressurise the 'empty' vessel from 1bar back up to 3bar the fall in pressure is slower for a similar rate of running a tap. As for leaks I have no evidence of any; and each night, & on weekends away, the whole system is switched off (we are slightly paranoid) with no pressure loss at all. There is no makers name on the pressure vessel nor on the plumbers invoice. Is there any diagram available of what is going on inside these things? Thanks Phil |
Slow leak in sealed water system
On Sun, 19 Mar 2006 06:06:13 -0800, PFO wrote:
Thanks Gav. The pumped pressure is set to sit at 3bar. Normally the pump cycles on again at 1bar. Over time to pressure drops from 3 to 1bar more and more quickly. After running down the pressure, by opening a tap with pump shut off, applying the tyre pump to re-pressurise the 'empty' vessel from 1bar back up to 3bar the fall in pressure is slower for a similar rate of running a tap. As for leaks I have no evidence of any; and each night, & on weekends away, the whole system is switched off (we are slightly paranoid) with no pressure loss at all. There is no makers name on the pressure vessel nor on the plumbers invoice. Is there any diagram available of what is going on inside these things? The SealedCH FAQ has a bit about pressure vessels in it. This is a blue (potable water) unit. I'd simply change the unit. However for your setup the precharge pressure on the dry side should be a around 1.0bar not 3 bar, otherwise the expansion vessel won't start to do anything until the water pressure is at 3 bar. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html |
Slow leak in sealed water system
Ed Sirett wrote:
On Sun, 19 Mar 2006 06:06:13 -0800, PFO wrote: Thanks Gav. The pumped pressure is set to sit at 3bar. Normally the pump cycles on again at 1bar. Over time to pressure drops from 3 to 1bar more and more quickly. After running down the pressure, by opening a tap with pump shut off, applying the tyre pump to re-pressurise the 'empty' vessel from 1bar back up to 3bar the fall in pressure is slower for a similar rate of running a tap. As for leaks I have no evidence of any; and each night, & on weekends away, the whole system is switched off (we are slightly paranoid) with no pressure loss at all. There is no makers name on the pressure vessel nor on the plumbers invoice. Is there any diagram available of what is going on inside these things? The SealedCH FAQ has a bit about pressure vessels in it. This is a blue (potable water) unit. I'd simply change the unit. However for your setup the precharge pressure on the dry side should be a around 1.0bar not 3 bar, otherwise the expansion vessel won't start to do anything until the water pressure is at 3 bar. thats what i was getting at! |
Slow leak in sealed water system
Thank you gentlemen. Now I wait to see if cycle time reduces over time
.. . . Phil |
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