Copper tank problem

[Madrab]

In hindsight, the only thing I would add to that is, given the current system was originally open vent then the pipework may be appropriately sized for low pressure/high flow, though the outlets have probably been changed and are now more suited to higher pressure (high flow shower/monoboc mixers taps etc).

 

[Sid1968]

Update:

Went in this morning. Put hand under mixer tap and the air gurgled out and flow restored.
Still a mystery why it was a direct feed. Probably same again airlock and the previous plumber assumed low pressure and pipe it directly.

Anyway all sorted. Thanks for all the help

 

[Madrab]

Oh .. so there wasn't any flow and now there is?? Well and truly confused now ... @terryplumb ...

At least it's sorted now I guess

 

[terryplumb]

Oh .. so there wasn't any flow and now there is?? Well and truly confused now ... @terryplumb ...

At least it's sorted now I guess

Glad to have helped......I think !!

 

[chris1337]

you can get copper unvented cylinders , maybe thats what was already there , they are slightly less pressure than SS is all

 

[Johntheo5]

Slightly!

Stainless Steel​

Pressure Reducing Valve - Max Inlet	12 BAR
Operating Pressure	3 BAR
Expansion Vessel Charge Pressure	3 BAR
Expansion Relief Valve Setting	6 BAR
Pressure & Temperature Relief Valve - Pressure Setting	7 BAR
Pressure & Temperature Relief Valve - Temperature Setting	90°C
Energry Cut-out Thermostat Setting	80°C
Primary Heat Exchanger - Max Working Pressure	6 BAR
Solar Heat Exchanger - Max Working Pressure	6 BAR
Immersion Heater Rating	3Kw - 240V AC

 

[Madrab]

you can get copper unvented cylinders , maybe thats what was already there , they are slightly less pressure than SS is all

View attachment 286697

You're right but given there was a capped vent pipe, no indication of a control group with a reducing and release valve (just a reducing valve), nor any other kinda controls kinda points towards it being a standard cylinder unless the OP can confirm whether there was any other indications that there was an correctly installed unvented cylinder - D2 relief pipework/tundish, a control valve group, EV, etc?

 

[Sid1968]

Nah. It was a copper tank bypassed to make unvented without safety controls.

My guess is previous plumber inexperieced didnt realise the pressure was due to airlock.????