Replacing expansion vessel

P

purplehands

Joined
3 Dec 2010
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Aberdeenshire
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United Kingdom
Hi folks, I noticed a drip from my overflow so went to check the pressure and got sprayed with water from the schrader valve, guessing the diaphragm is knackered in the expansion vessel so have ordered a direct replacement. I was wondering if this can be done without a full system drain, I know the vessel would be very heavy so would probably drill some holes in it to drain, but not entirely sure how to isolate it.

IMG_4531.jpeg


Any tips greatly appreciated!

Cheers
 
Close tap on cold water supply to cylinder, Run a hot tap to release pressure.
Open prv valve to reduce EV pressure to zero

Crack the capnut open a turn or two on the expansion vessel but not all the way
If no water comes out the capnut, undo completely and remove vessels. You will get wet. Do not drill the EV

You could Nick the horizontal pipe run under the EV and catch the dribbles/ discharge water from the vessel. When no more dribbles, cut the pipe and empty EV into a container to allow easy removal

Ensure new vessel is one specified for hot water cylinder and not for heating
 
doesnt look like that vessel has and support make sure you buy a support for it something like this
www.screwfix.com

Flomasta Expansion Vessel Fixing Kit - Screwfix

Order online at Screwfix.com. Universal wall-mounting kit for expansion vessels with a capacity of up to 25 litres. Includes wall-mounting bracket and adjustable mounting clip. FREE next day delivery available, free collection in 1 minute.
www.screwfix.com www.screwfix.com
 
Can I recommend that as it's an unvented cylinder and therefore a regulated appliance, for the safety of you and yours and to have the system setup correctly (correct pre-charge etc), I would recommend the work be performed by a qualified unvented engineer.
 
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