A gas range, for instance, requires a connector that can supply the amount of gas used when all burners are on high, with the oven on. I would use 3/4 inch. This should only be the drop if you are running the gas line over 15 ft. Often, the sizes can be modified for emergency use. The heated air is driven by an electronically powered fan to maximize the spread of the warm air. The chart below gives some examples of typical BTU demands. Example of a pipe system for a residential home. A gas cooktop rated at 45,000 BTU would take 45 CFH of gas supply. The average Btu per cubic foot is 1,100. The BTU capacity of a connector changes as the line increases in both diameter and length. When looking to install a new gas range, be mindful of the gas lines available to you. Make sure the gas line can handle your generator. Easily the most attractive feature of the Big Maxx 50,000 Natural Gas heater is that it can put out a whopping 50,000 BTU per hour, which can heat a garage ranging in size from 700-1250 square feet. Natural Gas Pipe Line Sizing Chart. I would not use galvanized pipe if I didn't need to. Lv 4. The average Btu per cubic foot in the Bay Area is 1,100. pressure less than 1 1/2 psig; common to use fittings factor 1.5 - equivalent pipe length in table above = pipe length + 50%; pressure drop 0.5 inches water column; specific gravity of natural gas 0.6; One MBH is equivalent to 1000 BTU's per hour (0.29 kW = 0.29 kJ/s); energy content in natural gas 1000 Btu/ft 3 (37.26 MJ/m 3); steel pipes schedule 40 The second table refers to pipe type K which is made from copper. To convert from BTUs to cubic feet per hour divide BTU by 1100 (example: 50,000 BTU by 1100 = 45.45 cubic feet of gas … Where the rating of the gas appliance(s) to be installed is unknown, Table 1 shall be permitted to be used to estimate requirements of typical appliances. Minimum Size of Piping Outlets: The size of the supply piping outlet for any gas appliance shall not be less than one-half (1/2) inch. Size vs. Demand The Btu/h per cubic foot of gas can vary, but PG&E uses an average of 1,000 Btu/h for every cf/h of gas. Other factors we can add at this point include pressure under 1 ½ psi, fitting factor is 1.5 per pipe length +50% and energy content in propane is 2520 Btu/cu ft. The larger the inside diameter, the greater volume of gas that can flow through it. Look at the chart on the back of this insert to assist you in determining the proper pipe size for your job. Pipe Size Needed On average a house using 300 to 400 CFH for all its needs requires 1.25-inch pipe from the gas meter to where the devices that use it branch off from the pipeline. Source(s): size gas line run 80 000 btu furnace brant: https://shortly.im/OaI7O. To find the appropriate size of gas line, you'll need a few measurements and a sizing table. Without the right sized gas line, your appliance won't work properly, or could turn into a safety hazard. 1 decade ago. Example building: furnace (80,000 Btu/h) + water heater (40,000 Btu/h) + kitchen range (50,000 Btu/h) + dryer (30,00o Btu/h) = 200,000 Btu/h total demand. To obtain the cubic feet per hour of gas required, divide the input of the appliances by the average Btu (kW.h) heating value per cubic foot of the gas. Thankfully, this makes them math pretty easy! To add a generator to a gas system you have to make sure you do not "starve" the other appliances. 1/2 inch will carry gas for a 100,000 btu furnace. 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