Unvented cylinder inspection

[Plumb Tidy]

Yes there is a expansion vessel fitted its not doing much though,
Whats happening is as the cylinder heats up the expansion is taking place down the cold main to the kitchen tap as there is no non return valve!

 

[Scott_D]

Is it on the hot outlet?
I cant see it in your picture

 

[Ben-gee]

Why are you proposing changing the cylinders rather than just adding a non- return valve?

 

[Plumb Tidy]

It is screwed to the top of the cylinder

 

[Plumb Tidy]

Why are you proposing changing the cylinders rather than just adding a non- return valve?

Sorry just to clarify, Im not changing the cylinders, just the pipework, although they have been neglected since 2004! My original question was would this issue need to be rectified before a safety inspection is signed off as im not sure if its water regs or unvented related.

 

[John.g]

It is screwed to the top of the cylinder

The top of the cylinder is normally the hot water outlet, it seems a strange place for a E.vessel if you are referring to this, if it is screwed to the cylinder top where is the HW drawn off?.

 

[Plumb Tidy]

The top of the cylinder is normally the hot water outlet, it seems a strange place for a E.vessel if you are referring to this, if it is screwed to the cylinder top where is the HW drawn off?.

Sorry i couldn't flip the image but yes the expansion sits on the top which is incredible unstable when trying to re charge it.

 

[John.g]

The attached gives some idea of pipework which may be of some little use even though for a different type.

 

[Plumb Tidy]

The attached gives some idea of pipework which may be of some little use even though for a different type.

Cheers John G, this is the ultrasteel which is what kingspan and albion manufactured when they merged. Same rules apply the non return valve after the cold connection to protect it by ensuring expansion takes place in the vessel and not in the cold water supply to taps. Thanks all i have enough evidence to justify my work on all the cylinders.Shame they wasn't fitted properly ut then again thats where half my work comes from.

 

[Ricky]

Interesting way of installing the cylinder,
Have they sent you the orignal fitting instructions?
Why would you put the pressure gauge before the pressure reducing valve, it doesn't tell you anything helpful, ie is the pressure reducing valve shutting off at correct pressure.
Most cylinders have multiblock inlet valves, where you take the cold supply from, did some plumber fit what he thought was correct?
As Scott asked where is the expansion tank connected, I have always installed the expansion vessel on the inlet, again its to do with Legionella etc you don't want that amount of possible stagnant water on the outlet where it can get warmed up.