Another question for plumberists...

Have you used him before, or is he a new engineer ...get him back first light

 

And is that what they did at Chernobyl?
(Presumably after taking off shirt...)

 

You have three issues.

1. You required a new expansion vessel. The pressure is shooting up when you run a hot tap as that’s when the boiler goes to max output, therefore gets hottest, therefore has max pressure increase.
2. You need a new pressure relief valve. It should have opened at 3 bar. A non functioning prv is dangerous
3. You are spending money on a useless British Gas contract. You should have a word with yourself.

By the way a stuck prv is often a sign it’s been happening for a while or you have excessive system contamination.

 

No that was Three Mile Island.
Water level went up in the header tank so they turned off water feed to the reactor primary coolant loop.. because they thought it was too full. Turned out there was a load of steam in the reactor core and pipes pushing the water out.

And a duff leaky valve that made a temperature gauge always read high in the vent pipe so it didnt look hotter than usual with steam in it.

A set of warning red lights that effectively had "reactor fubar" next to "control room lift doors open" or similar.

And a ex-navy submarine tech operator who thought turning everything off stops a 1GW reactor. It stops a 5MW nuclear submarine reactor, convection removes a few hundred kilowatts of residual output. At TMI and Chernobyl the residual output was more like 60MW.. its short half life stuff that keeps breaking down producing heat for hours even with control rods fully in.


Good Off Topic content ?

 

The PRV is probably blocked with rust..

 

And Hemel Hempstead just before the oil and fuel storage tanks took off

 

Your filling loop may also be letting by. So it’s slowly increasing the pressure in the heating system up to the incoming mains pressure. That will pop the expansion vessel. The prv should still have opened if that’s a genuine reading and not a faulty gauge.

 

On mine when I touched the filling loop isolating valve, it stuck shut then started dripping when I got it to move. I could imagine it just leaking into the heating system too.
Just like a camper van a £3.00 part causes a crisis...

 

Any updates on boilergate?

 

Maybe he's sitting on the roof clutching the boiler

 

Lol.

 

Please tell me they replaced the prv

 

our Boris was right ...