Santon unvented cylinder.

[Christopher buzzard]

hi G3 qualified but unsure how to join the private forum. Just didn’t want to post in the public forum.
santon 210 indirect with low pressure at the outlets and a banging noise.
Changed the combination valve which sorted the pressure drop issue but the noise persists.
Static pressure is 4.5 bar on outside tap. All other feeds are balanced after the combination valve. Cylinder in 3rd floor. The pressure at the on the expansion vessel was 3.3 bar. Dropped to 3 bar. Rumbling, banging Noise still there. Dropped to 2.5 bar, noise stopped on all taps bar the bath tap which would produce a short thud when turned on.
Left it for the day but she txt tonight to say the noise was back at all taps and slightly louder.
I’m at a loss. Has any1 had an experience like this Or advise? I will ring technical in the morning.
The cylinder outta casing lid as come away from the cylinder. Unsure if this is linked.

Thank you.

 

[ShaunCorbs]

What’s the pipe work like clipped etc ?

 

[Scott_D]

Replace the expansion vessel?

 

[Christopher buzzard]

Yeah clipped very well. Hinged clips Every 900mm roughly

 

[Christopher buzzard]

I was wondering the expansion vessel but it is holding pressure. I went there to 2 weeks ago on my 1st visit and checked it then. was the same reading again today when i checked it before I lowered it.

 

[ShaunCorbs]

Might be worth removing it and pumping it upto 4-5 bar just to check if the rubber isn’t stuck on the outside wall due to it over expanding due to low pre charge

 

[Christopher buzzard]

Thanks Shaun. Will try that.
is that anything to worry about?

 

[ShaunCorbs]

No fine insulation expanding

 

[townfanjon]

How old is the cylinder Christopher ?

 

[Christopher buzzard]

2013 on the data sticker. Everything looks original apart from the combination valve I changed.

 

[WC1]

Does the g3 private forum actually exist?

 

[Christopher buzzard]

Says G3/unvented - private.

 

[WC1]

Yes. I'm g3 - have been for a few years. When I tried to get in to the private forum my messages to admin (Not sean) were unanswered.