Gas pipe in back garden for gas cookers

Mr james Wilkinson is incompetent, because pipe from gas meter provides gas to both apliances first, so you need add kilowattage ( 38=30 = 68kW) and check a lengt to first tee, then choose diameter for 6,2m3/h but 6,2m3/h exceedes domestic gas instalation and meter doesnt deliver that much. Any gas pipe undersizing and fiiting apliances above 6m3/h qualifies instalation as Imediately dangerous

A standard low pressure domestic natural gas meter should deliver 6m³/h The maths based on your stated KW appliances: 68kw x 3.6 ÷ 39 = 6.27m³/h So the final figure is just above the capacity your gas meter can deliver, but as you have stated, very rarely will both appliances be running at full rate simultaneously. Now for minimum pipe size: From meter to boiler. Pipe size = 22mm copper From boiler to cooker. Pipe size = 35mm copper (1-1/4" BSP) The above pipe sizes does not take in to account for any fittings, so the final size may be slightly larger. With respect I am not here to carry out a theoretical risk assessment. Just simply ask you builder to get the pipe sizing correct, most important! In response to Heatco Ltd offensive remarks below. Often we receive information from well meaning home users that are questionable, in the case the KW rating of the cooker. The competent person who is carrying out the work above will arrive at his own conclusions whether the installation is indeed 'AR' as I suspect, but until then the risk value is unproven on your part. At the very worst it may become 'AR' not 'ID' And if you had bothered to read my full post, I indeed stated that the KW rating of both appliances exceed the output of the gas meter (if we are to believe it is a standard low pressure one)!