Expansion like vessel

[Johnyc86]

Currently installing air to water and underfloor.theres this expansion like vessel with two 3/4 iron male threads on top and bottom of it with no bladder on between.its goes before the primary flow hits the cylinder and underfloor manifold.anyone know of its function??we don't do alot of air to water installs.be gratefully for a reply

 

[Chuck]

Currently installing air to water and underfloor.theres this expansion like vessel with two 3/4 iron male threads on top and bottom of it with no bladder on between.its goes before the primary flow hits the cylinder and underfloor manifold.anyone know of its function??we don't do alot of air to water installs.be gratefully for a reply

Photo? Size?

 

[ShaunCorbs]

It’s a flow through expansion vessel normally used on potable water to bring the legionella risk down

 

[John coen]

Photo? Size?

Off the job atm.its same size as a 12l expansion vessel.two 3/4 male iron threads on top and bottom

 

[John coen]

It’s a flow through expansion vessel normally used on potable water to bring the legionella risk down

But this is on the primary flow..??

 

[ShaunCorbs]

Still fine just there more expensive that the regular ones

 

[SJB060685]

The idea of a flow through expansion vessel is to prevent stagnation water and potential build up of legionella bacteria. The water is constantly moving through one of these vessels, rather than staying put and becoming a risk. As Shaun says usually on hot water circuits but will work just the same in a heating circuit.
Remember the vessel creates the point of no pressure change and should be sited in the correct place.

 

[Johnyc86]

The idea of a flow through expansion vessel is to prevent stagnation water and potential build up of legionella bacteria. The water is constantly moving through one of these vessels, rather than staying put and becoming a risk. As Shaun says usually on hot water circuits but will work just the same in a heating circuit.
Remember the vessel creates the point of no pressure change and should be sited in the correct place.

So even when there's no pump circulating

 

[SJB060685]

The point the vessel tees into the system is the point of no pressure change when the circulating pump is energised. Ideally you want the vessel on the return back to boiler with the pump shortly afterwards.