Oso unvented. Cold water through tundish

[Welder]

internal bubble

On an OSO?!?

 

[chris watkins]

1. I would have felt the T&P discharge pipe to see if it was hot, if cylinder is hot then any discharge from it will make the pipework hot.
2. If it is cold then assume the relief is discharging.
3. Checked the expansion vessel & drained down & recharged the vessel / bubble.
4. Re-filled the cylinder set it to heat & check for further discharge if none then monitor, if there is then loosen the nut on the discharge side of each to confirm if it is the relief or the T&P replace as required.

 

[Welder]

1. I would have felt the T&P discharge pipe to see if it was hot, if cylinder is hot then any discharge from it will make the pipework hot.
2. If it is cold then assume the relief is discharging.
3. Checked the expansion vessel & drained down & recharged the vessel / bubble.
4. Re-filled the cylinder set it so heat & check for further discharge if none then monitor, if there is then loosen the nut on the discharge side of each to confirm if it is the relief or the T&P replace as required.

Agree. However I always removed the relief valve head and checked the seat just in case running a finger smeared with silicone grease over it so it can never stick (as rubber does when not used frequently) so ends up tearing when it does eventually get lifted off the seat.
BTW, when you do that it always leaks when put back. However by turning it a few times it reseats.
God we're anal!!!

 

[armyash]

If I isolated the inlet but it's the t and p that is faulty would this not continue to run after I have isolated?

 

[chris watkins]

On an OSO?!?

Series 20 & I think 16 are bubbles Dave.

 

[Welder]

Series 20 & I think 16 are bubbles Dave.

Thanks Chris. Gosh never knew that.

 

[armyash]

I have the customers copy of the manual

Come on Ash there must be something to accommodate expansion, either it is a bubble top or it has a vessel/s ?
If it hasn't got a vessel did you recharge the bubble, it could be that the expansion relief was discharging because the expansion was not being accommodated.
In which case it just needed a service.

Has the air gap with the instructions on the side like with the megaflo. Followed that and no change.

 

[Welder]

If I isolated the inlet but it's the t and p that is faulty would this not continue to run after I have isolated?

Depends. As you remove the pressurisation from the incoming side then, if it's borderline on the pressure side, it may sit back down and seal. You could only tell that if you had pressure gauges all over the show.

Did you reset the bubble? How long did that take?

 

[chris watkins]

Thanks Chris. Gosh never knew that.

Thats because you never asked BBA.

Sorry Dave just could not resist that one.

 

[Welder]

Thats because you never asked BBA.

Sorry Dave just could not resist that one.

View attachment 36261

Swine!
Note to self: Watkins dies on Thursday...