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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Boiler dripping from pressure relief pipe
Hi,
I have a non-condensing combi (Ariston Microgenus) from which there is a slow but constant drip from the 15mm pipe sticking through the wall to the outside (which I think is for emergency pressure relief?). The pressure gauge on the boiler is at 2 bar, which is within its tolerance range. So why is it dripping and what should I do to stop it? Cheers! Martin |
#2
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Boiler dripping from pressure relief pipe
"Martin Pentreath" wrote in message ... Hi, I have a non-condensing combi (Ariston Microgenus) from which there is a slow but constant drip from the 15mm pipe sticking through the wall to the outside (which I think is for emergency pressure relief?). The pressure gauge on the boiler is at 2 bar, which is within its tolerance range. So why is it dripping and what should I do to stop it? Cheers! Martin It will eventually lose pressure. In my experience, once they start leaking they can't be cured. But, it might be worth twiddling the knob on the valve (usually a green ridged plastic cone) which will release some pressure and might flush debris away from the seat. They start leaking for one of three reasons. 1, someone has twiddled the valve and let debris into the seat. 2, the system has been overpressurised during topping up. 3, the expansion vessel isn't functioning correctly which in turn means either the diaphragm has gone, or it needs topping up with air: see the Wiki. (http://wiki.diyfaq.org.uk/index.php?title=Main_Page and also http://www.makewrite.demon.co.uk/SealedCH.html). Replacing the valve isn't usually difficult provided you are happy to put spanners on plumbing. Spares are cheap from BES; make sure you get the right gender for the inlet and outlet threads. You need to depressurise the system to do this. |
#3
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Boiler dripping from pressure relief pipe
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Martin Pentreath saying something like: I have a non-condensing combi (Ariston Microgenus) from which there is a slow but constant drip from the 15mm pipe sticking through the wall to the outside (which I think is for emergency pressure relief?). The pressure gauge on the boiler is at 2 bar, which is within its tolerance range. So why is it dripping and what should I do to stop it? If the pressure relief valve is the spring-onna-wotsit-wivva-red-cap type, try quickly rotating the cap so it reseats. Often a bit of system **** will clag the seat. If that doesn't work just replace it, they're cheap enough. Dripping from these is quite a common fault. |
#4
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Boiler dripping from pressure relief pipe
Grimly Curmudgeon wrote:
If the pressure relief valve is the spring-onna-wotsit-wivva-red-cap type, try quickly rotating the cap so it reseats. Often a bit of system **** will clag the seat. If that doesn't work just replace it, they're cheap enough. Dripping from these is quite a common fault. If the relief valve is leaking, the system pressure should gradually drop. Once a volume of water equal to that of the expansion vessel has left the system, which at a steady drop should be a matter of hours or days, the pressure should have gone to zero. That the system is nevertheless still at pressure (the OP said 2 bar) would, I suggest, seem to indicate that there is a leak in the manually operated (and normally fully shut) mains water top-up valve. Come to think of it, isn't 2 bar a bit on the high side? Could it be that the relief valve is actually doing its job perfectly, and that the real problem lies *only* with the top-up valve? |
#5
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Boiler dripping from pressure relief pipe
On Oct 17, 11:12*am, Ronald Raygun
wrote: Grimly Curmudgeon wrote: If the pressure relief valve is the spring-onna-wotsit-wivva-red-cap type, try quickly rotating the cap so it reseats. Often a bit of system **** will clag the seat. If that doesn't work just replace it, they're cheap enough. Dripping from these is quite a common fault. If the relief valve is leaking, the system pressure should gradually drop.. Once a volume of water equal to that of the expansion vessel has left the system, which at a steady drop should be a matter of hours or days, the pressure should have gone to zero. That the system is nevertheless still at pressure (the OP said 2 bar) would, I suggest, seem to indicate that there is a leak in the manually operated (and normally fully shut) mains water top-up valve. Come to think of it, isn't 2 bar a bit on the high side? *Could it be that the relief valve is actually doing its job perfectly, and that the real problem lies *only* with the top-up valve? Thanks to all. I think Ronald could have hit the nail on the head. The system has been dripping for weeks without being topped up, but is still at full pressure, so I guess is must be the top-up valve.letting through. I shall make further investigations ... |
#6
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Boiler dripping from pressure relief pipe
Martin Pentreath wrote:
So why is it dripping More to the point does boiler dripping taste as good as beef dripping? |
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