Pressurized expansion tank

[MichaelL]

Hello, quick question, am I right in thinking that with a pressurised expansion tank disconnected from the system and a bicycle pump on the valve, if air is blowing straight through then the diaphragm is knackered and I need a new vessel ?
Any advise greatly appreciated.

 

[Simon F]

Hi Michael, welcome along.
if you are pumping the vessel up and it won't hold any pressure then yes it needs swapping,
or your pump needs swapping?
if its disconnected then a foot pump is an easier option.

 

[chris watkins]

What are you going to charge the new one up to (what pressure ??)

P.S what colour is it ?

 

[stevetheplumber]

you need an open end on the system to presurise the exspansion vessel either open the prv or a boiler drain cock

 

[happyflyer]

[video=youtube;KeO2gswQQe4]https://www.youtube.com/watch?v=KeO2gswQQe4[/video]