What is the minimum size of Type L tubing that may be used for a propane load of 475,000 btu/hr over a distance of 55 feet?

When determining the minimum size of Type L tubing for a specific propane load, several factors play a crucial role, including the BTU/hr requirement and the distance over which the gas must be transported.

For a propane load of 475,000 BTU/hr, it is essential to refer to the tables provided in the NFPA 58 code that outline the appropriate sizing for gas piping. These tables account for both the load requirements and the distance that the gas must travel, ensuring that the selected tubing can deliver sufficient gas pressure without significant loss.

In this scenario, after evaluating the BTU load and the length of piping required, the minimum size identified is 1/2 inch. This size will allow for effective delivery of the propane while adhering to safety and efficiency standards set forth by NFPA 58. It ensures that the system maintains gas pressure and flow without undue restrictions, which are critical factors in both performance and safety when dealing with liquefied petroleum gases.

Choosing a tubing size smaller than 1/2 inch could lead to inadequate delivery of propane to the appliance, resulting in poor performance or even unsafe conditions. Thus, 1/2 inch is deemed the most appropriate selection for the given specifications.