Peak hourly load rates

[Aire]

Thanks Craig. Its the 70kw cut-off limit which I wasn't sure of. Does that mean that you can't work on any pipework on a system over 70 kw?

I thought a lot of the regs are based on purge volumes rather then the load of the system.

Yeah, so with regards to op's system, if I turned up, I would simply say because your installation is over 70kw, I can't work on it.

 

[Mastermixlee]

Hi everyone, my first posting here.

It is my understanding that you can't work on Boilers on a system that are on the SAME system (2 Boilers connected to same central heating circuit) if combined kW rating exceeds the 70.
But if, for example, the left boiler was zoned off on its own pipework feeding upstairs and the other boiler was feeding downstairs then its deemed acceptable to work on under domestic ticket provided the gas supply checks are OK as mentioned by Craig above.

 

[Aire]

I believe the gas supply would have to also be on a separate circuit too, gas isolation valve with test nipple after it so you can test the gas independently of the rest the system.

 

[robdog6000]

Cheers for providing some clarity on this. I often work on large domestic houses with u16 meters. The heating and gas design is designed by a consultant and he has us fitting isolation and purge valves all over the place.Costs the poor customer a fortune but I guess it covers us working on large systems.

 

[ShaunCorbs]

Cheers for providing some clarity on this. I often work on large domestic houses with u16 meters. The heating and gas design is designed by a consultant and he has us fitting isolation and purge valves all over the place.Costs the poor customer a fortune but I guess it covers us working on large systems.

Yea really you shouldn’t be doing the gas if it’s over spec should get a commercial engy to install the pipework and valves

Then a domestic engy can fix / install from the valves

 

[robdog6000]

So 2x 30kw boilers on a u16 is beyond the scope of domestic?

 

[Aire]

So 2x 30kw boilers on a u16 is beyond the scope of domestic?

Depends on the installation. U16 with up to 35mm pipe work and up to 0.0035 m3 gas volume then your fine, anything over that then commercial ticket is needed.

 

[ShaunCorbs]

Anything over 70 kw loading on the gas meter for install is commercial

 

[robdog6000]

Cheers guys. This always seemed like a bit of a grey area to me. Seems a bit clearer now though. Thanks very much.