Can a DIYer replace an expansion vessel

[Crossfingers]

Hi

Is it possible for a DIYer to replace an expansion vessel and hose? It's an external grant vortex boiler and from what I've seen online it looks simple enough

 

[John.g]

Why does it require a new EV, a new hose and proper precharging & filling may be all thats needed?.

 

[Crossfingers]

A Certas engineer said so at service. To be fair he didn't say he'd quote until I asked him to, which seems pretty expensive. He said it was very heavy. Does that water out of the valve check work on this model, I'm yet to check?

Do have any advice on how I could confirm what he said?

Thanks

 

[John.g]

Press thge schrader valve needle and see if air or water comes out, if neither or no pressure with needle depressed, isolate the boiler or drain down system and remove the water end hose, pump up the air end (if you can) to say 1.5bar, put your hand over the water end and see if any pressure buids up even slowly, if so, the diaphragm is punctured and new EV required.

 

[ShaunCorbs]

As above sounds like it just needs recharging

 

[SimonG]

Recharging pressure vessel is a standard task on my oil boiler services.

Easy enough to check out, just be careful if you do diy it that you dont spray water over the electrics or burner.

 

[Crossfingers]

I gave to valve two quickish presses and no water. I assume water would eject instantly? I'll try to recharge it later.

 

[SimonG]

Only if the Schrader valve is at the bottom.

 

[Crossfingers]

Only if the Schrader valve is at the bottom.

It's at the top..so how long should I press it for?

Thanks

 

[SimonG]

Normally the air will have droplets of water with it if the vessel has gone. Just try to recharge it and go from there. Dont forget to dump the water pressure first before pumping up the vessel.

 

[Crossfingers]

I think I saw a spray of water when I first pressed. Ill check again.

Thanks

 

[Crossfingers]

Nope, no spray. Maybe it was dust or something

 

[Crossfingers]

Tried pumping it back up and could hear bubbles in the boiler. Time for a new vessel I think.

 

[compressorman]

Normally the air will have droplets of water with it if the vessel has gone. Just try to recharge it and go from there. Dont forget to dump the water pressure first before pumping up the vessel.

I got same problem!
I drained water till zero on water guage, then inflated the EV, The water guage went up, shud that happen?

 

[ShaunCorbs]

I got same problem!
I drained water till zero on water guage, then inflated the EV, The water guage went up, shud that happen?

Keep draining while you pump up and wait until the water stops then pump some more until you have no water coming out and the shrader gauge says 1 bar

 

[SimonG]

I got same problem!
I drained water till zero on water guage, then inflated the EV, The water guage went up, shud that happen?

If that happens dump the pressure again, until the water gauge doesn't increase whilst pumping up the vessel.

 

[compressorman]

If that happens dump the pressure again, until the water gauge doesn't increase whilst pumping up the vessel.

many thanx for that, will try that tomorrow, I thought the EV had punctured and the air was leaking into the water?

 

[SimonG]

many thanx for that, will try that tomorrow, I thought the EV had punctured and the air was leaking into the water?

No, as you pump up the ev the water inside it is pushed back into the system and can make the water gauge increase.

 

[compressorman]

Keep draining while you pump up and wait until the water stops then pump some more until you have no water coming out and the shrader gauge says 1 bar

only have one guage, water, let me get this clear, if I pump up EV and leave open the water drain tap that will drain water to zero..the close water tap and repressurise, is that about right?

 

[compressorman]

only have one guage, water, let me get this clear, if I pump up EV and leave open the water drain tap that will drain water to zero..the close water tap and repressurise, is that about right?

no got it wrong u mean one bar on footpump, and zero on water guage, then add water to one bar on water guage?