Commissioning multiple gas appliances (requirement for all to run at same time?)

[Green Bin]

Hi Everyone...I am a M&E project manager (so no real gas experience)

I have an issue on a poly-clinic coming up for handover, we have two LTHW boilers and two DHW generators, they are designed to operate as duty/standby controlled by the BMS, i.e. so in theory only one of each will work at any one time.

Mech Engineer has said that the guys commissioning the boilers were insisting that when they commission all boilers should be running at the same time (presumably for gas pressure reasons). Now I can understand running a LTHW and a DHW boiler at the same time after the individual boilers have been commissioned...to establish that they will work in normal use, but I can't understand why they all have to be running, is this a gas safe thing?

Trouble is the gas meter (and pipework) has been sized by the M&E consultant on the normal peak load, not to allow all the boilers to be running for commissioning purposes. Is there a specific regulation that stipulates all kit should be running at the time of commissioning regardless of the control protocol? (Would love a specific gas regulation and wording either way)

In terms of duty/standby set up, is BMS control enough to satisfy gas safe or do they need to be locked off by hand as well

 

[oldplumber]

Not sure for commercial but my understanding is that the meter and pipework should be capable of running all fitted appliances at once together, as that is a possible situation no matter what the designed running aspects are. After all if the building is expanded in the future whos to say that all of the appliances wont be needed to heat the water and property?

 

[gbgas001]

You will not find anywhere a regulation that covers this that im aware of. The general commissioning is a make sure its safe.
Not only are you checking the boilers but flues as well, I take thes units will be goining into a flue header with one exit from the boiler house?
The meter will be sized big enough for the whole installation but the pipe work may be staged in such away as to allow all appliances to run. rather than looking at typical demand.
I think the engineer is correct in making all appliances run at the commission. I dont really understand your last question with the lock off the appliances have there own safety systems, when would you want them to lock off?

gb-gas

 

[Reg Man]

Installation design must cater for maximum demand. Refer to Intistute of gas engineers document utilization proceedures IGE/UP/2.