When computing the total BTU requirements of an appliance we must consider the maximum amount of fuel consumed under a worst case scenario.

It is a foregone conclusion that you will frequently use all four surface burners at the same time, therefore you must allow 15K/BTU per burner x 4 burners equals 60k/BTU for the surface burners.

Computing the load for the ovens and broilers would then depend upon the design of the appliance. Typically a residential free standing gas range will only have one oven and broiler, and it will only allow you to use either the oven or the broiler. If you can only use either the over or broiler you then select the greater of the two loads.

By example, you stated the oven burner is rated at 22K/BTU while the broiler is rated at 16.5K/BTU. If you can only use the oven or the broiler but not both at the same time the worst case scenario is then the oven burner @ 22K/BTU and your total gas requirement would be 22K/BTU for the oven plus 60K/BTU's, for the surface burners for a total of 82K/BTU.

On the other hand, they make high end designer grade ranges that have dual ovens, in which case you would need to factor in the fuel requirement for each oven plus the surface units.

My Mother has an old Blodgett commercial range that has 6 surface burners, two ovens, a broiler and a 2ft x 2ft cast iron grill, all of which can be used simultaneously.

Once you have computed the total BTU load, you must then compute the total developed length of the pipe from the storage tank to the appliance. Note-while your tank may be 50ft from the kitchen TDL (total developed length) is the total length of the actual pipe including all runs, drops, rises.

When you know the actual total BTU load and the TDL you should contact your gas supplier or inspector to determine the line size required by your local code. In many cases local code line size tables are adjusted for the average ambient temperature at your location and your altitude above sea level.

You must also find out what type of pipe is permitted for your location. By example, here where I live we can use copper pipe in the county, but in the city we are required to use Black Iron pipe for the full distance and all buried black iron pipe must be factory wrapped and all buried fittings must be field wrapped.

Unless otherwise stated in your local code, you must also have a dielectric union not more than 6" above grade at the point where the buried line transitions to above grade piping.

Code requires all appliance installations to have a shutoff valve in the near proximity of the appliance. (Near proximity is generally defined as not more than 3ft from the appliance.)

When running black iron pipe some local codes will allow the use of a flex connector as the final connection from the shutoff valve to the appliance whereas in our community flex connectors are prohibited and we are required to run black iron pipe all the way to the appliance regulator input.

You should also be aware that flax connectors are not permitted to pass through an appliance housing. When using a flex connector you are required to install a pipe nipple to extend through the housing and the flex connector is then connected to the pipe nipple outside the appliance.

Great info, thank you! This range has just one oven, so I'll use 4x burners plus oven element. And will call the gas company on Monday.
Thanks