I am in the process of building a function room. The gas supply at present is for a normal domestic supply to the front of the premises which I need to upgrade to a commercial supply. My gas consumption will be approx 600,000 btu's ie kitchen, heating and hot water. All the appliances are situated at the rear of the premises. The run from the gas meter to the appliances is 52m with 6x 90deg bends. I want to run the gas supply from the meter to the appliances in mild steel pipe running the pipe through the roof space. My question is what would the specification for this pipe be ie.diameter, thickness,grade etc.
As I don't have access to charts at home I will say from experiance that your pipe work will be 1 1/2" - 2" (have this checked out by CORGI installer who will be doing the job. Grade of pipework will be medium grade black iron pipe which must be painted yellow or identified by gas identity tape every meter.
Other important factors are
1) where the gas supply enters the boiler house a 240V gas safety shut off valve must be installed, this is to be a class 1 normally closed automatic reset valve wired to a panic button (push to activate, twist to reset) the panic button must be yellow in colour with a red push button. Also wired in series should be thermal links (one per appliance) which will be installed above the burner of each boiler. In the event of a fire if either the thermal link melts or the panic button is pushed this will prevent any further gas from entering the area by closing the safety shut off valve.
2) The gas supply entering the kitchen area must have a 240V gas safety shut off valve installed, this must be a class 1 normally closed MANUAL reset valve wired to a key operated panic button (push to activate, key to reset) The panic button to be wired to the gas valve and a commercial kitchen pressure proving system. This is to prevent gas cookers from being acidently left on when the gas supply has been isolated then reset.
To be honest this is something that should be designed by a gas specialist and not through a forum where you have no idea of the qualifications behind the advice, there is gas detection considerations, which may be a condition of insurance and your health & safety evaluation and there may be ventilation requirements due to roof space installation.
Thanks yery much for the information it is very useful. My main objective was to install the main pipe runs before all the ceilings are fitted. I'll take your advice about finding a gas installer but they are not the easiest people to find. Agian many thanks. Martin
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