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Discuss Unvented system and expansion tank pressurisation in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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I've recently had a prv changed by a British Gas engineer under the homecare contract that I've taken out. The valve had failed and water was pouring out from the overflow pipe.
The valve was replaced without too much issue. However, the red expansion tank above the boiler was NOT re-pressurised after fitting the new valve. The engineer told me that the system would re-pressurise itself when I used the system over the next few days. I've been told by a plumber friend that this is an error and the tank should have been re-pressurised after the prv was changed.
I'd really appreciate some guidance from an expert in this forum in terms of which advice is correct.
 
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Messages
6
Is it on the cylinder the valve or below the red expansion tank ?
The drip (water flow full force) was after the prv that had failed and the drip has now stopped. Following the replacement of the prv, the engineer did NOT re-pressurise the red expansion tank. Is that a mistake, should it have been re-pressurised?
 
Messages
6
Thanks to Scott_d for making me check the colour of the expansion tank. I wrote the message while away from home and from memory. I called the other half to check and the expansion tank is white!
It's located above the hot water cylinder. I don't have a picture of the area at hand. I'll be back home at the weekend and can post a pic then.
In the interim, thank you for all of the replies and assistance so far.
Paul
 

SimonG

Plumber
Messages
20,174
That's why I wanted a photo. I would be surprised if the pressure on the vessel wasnt checked whilst the pressure was off. Well that's what I would do.
 

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