|
|
Post by rocketmanbkk on Jun 4, 2021 12:30:12 GMT
Hello
I’ve been to the woman to have a look at the pressure drop.
The pressure vessel when you take the cap off of the valve has an air leak.
I take it that as per a bike or car tyre there valve without it’s cap should be air tight?
I think this could be the problem.
She topped it up on Wednesday to 1.1 bar & this morning it was at about 0.8bar.
Cheers all
|
|
|
|
Post by battle1066 on Jun 4, 2021 15:50:54 GMT
Hello I’ve been to the woman to have a look at the pressure drop. The pressure vessel when you take the cap off of the valve has an air leak. I take it that as per a bike or car tyre there valve without it’s cap should be air tight? I think this could be the problem. She topped it up on Wednesday to 1.1 bar & this morning it was at about 0.8bar. Cheers all Correct it should not leak. The valve incert unscrews just pop into a tyre repairer and he'll show you the tool he uses to remove them and he may give you a new incert free. |
|
|
|
Post by dickpuller on Jun 4, 2021 15:52:40 GMT
|
|
|
|
Post by rocketmanbkk on Jun 4, 2021 16:30:05 GMT
Thanks very much
I never knew they could be fixed!
So when I go to fix it should I just release the pressure in the vessel & change it then pump up again to 2 bar?
Am I likely to have a flood?
Thanks again
|
|
|
|
Post by battle1066 on Jun 4, 2021 17:55:16 GMT
Thanks very much I never knew they could be fixed! So when I go to fix it should I just release the pressure in the vessel & change it then pump up again to 2 bar? Am I likely to have a flood? Thanks again If water comes out of the valve body when the incert is replaced the full expansion vessel (EV) assembly needs replaced but I wouldn't expect that issue. What I do if needed release the EV pressures then the boiler system water pressure, then recharge the EV to the value for the size of the EV then set the system water pressure to the value required for that boiler - test operations and jobs done. |
|
|
|
Post by rocketmanbkk on Jun 4, 2021 20:06:34 GMT
Thanks very much I never knew they could be fixed! So when I go to fix it should I just release the pressure in the vessel & change it then pump up again to 2 bar? Am I likely to have a flood? Thanks again If water comes out of the valve body when the incert is replaced the full expansion vessel (EV) assembly needs replaced but I wouldn't expect that issue. What I do if needed release the EV pressures then the boiler system water pressure, then recharge the EV to the value for the size of the EV then set the system water pressure to the value required for that boiler - test operations and jobs done. Do you know where I’d find the pressures I need to get it back to? Or is there a way to work it out from the boiler Kw & vessel size? Is there a formula? |
|
|
|
Post by battle1066 on Jun 4, 2021 21:01:53 GMT
If water comes out of the valve body when the incert is replaced the full expansion vessel (EV) assembly needs replaced but I wouldn't expect that issue. What I do if needed release the EV pressures then the boiler system water pressure, then recharge the EV to the value for the size of the EV then set the system water pressure to the value required for that boiler - test operations and jobs done. Do you know where I’d find the pressures I need to get it back to? Or is there a way to work it out from the boiler Kw & vessel size? Is there a formula? The EV Is typically set to 15psi and the boiler will have a mark on the boiler gauge. |
|
|
|
Post by dickpuller on Jun 5, 2021 7:24:54 GMT
EV’s as a rough Rule of Thumb should have the air pressure set under the water pressure:
So .2-.3 below the water pressure.
Combi/system boilers with integral EVs .8-.9Bar. Sealed system EVs the same.
Unvented cylinders with Potable EV’s 2.6 - 2.8Bar.
Any sign of water out the Schrader Valve is generally an indication of a fucked diaphragm in the EV. However, not always!
There can be condensation in the air chamber. I’m an advocate of removing any EV & pumping it up.
But remember the fucker is full of water!!
Wee story; had a Block of Flats & the rough cunts who’d installed the Hot Water UVCs, only used Brollies & Drivas to secure the EV bracket to the Plasterboard Walls.......So, when the EV failed - for one reason or another, the EV turned into a container weighing 18KG!! Many fell off the wall, flooding the gaff(plus the Flats below), or at best fell off & were precariously supported by the Pipes.
That was a fun job😂😂😂😂 💦💦💦
|
|
|
|
Post by woodbine66 on Jun 5, 2021 18:27:18 GMT
If anyone on here watches Steve Lavimoniere's videos from over the pond, I'm always surprised that when he finds an EV on a system that's full of water he never tries to repressurise it. Always bins it and new one in. Maybe EVs are very cheap in The States and not worth the hassle. Lot of water in some of those domestic Yanky systems. Those full EVs weigh a ton.
|
|
