For a house built with two 65,000 BTU furnaces and three 55,000 BTU fireplaces, what size L copper gas tube is required from the meter?

To determine the appropriate size of the L copper gas tube required from the meter for the given appliances, we first need to calculate the total BTU demand of the house.

The total BTU load can be calculated by adding the BTU rating of the furnaces and fireplaces. In this case, you have two furnaces, each rated at 65,000 BTU, giving a total of 130,000 BTU from the furnaces. For the three fireplaces, each rated at 55,000 BTU, the total is 165,000 BTU. Combining these figures yields a total BTU demand of 295,000 BTU (130,000 + 165,000).

The key part of sizing the gas line is understanding how gas flow rates correspond to pipe diameters and BTU demands. The gas piping must be sized sufficiently to deliver the required gas volume without significant pressure drop under the maximum expected load conditions.

For a total of 295,000 BTU, industry standards and tables provide guidance on what diameter of copper tubing would be suitable. Given that the requirements typically show that for higher BTU loads, a larger diameter is necessary, the 1-1/4 inch diameter fits just within the