What size of corrugated stainless steel tubing is required to deliver 248,000 BTU of propane to an appliance located 82 feet away?

The selection of tubing size for gas delivery is determined by several factors, including the BTU requirement of the appliance, the distance from the gas source, and the pressure drop that can be tolerated in the system.

In this case, the requirement is to deliver 248,000 BTU of propane over a distance of 82 feet. When sizing corrugated stainless steel tubing, it is essential to verify that the chosen size can adequately handle the BTU load while minimizing pressure loss over the distance.

Tubing size 37 (EHD) is likely referred to in this case as appropriate because it has been calculated to meet the BTU demand under the given conditions while maintaining a safe operating pressure. Each size of tubing corresponds to a specific capacity to deliver gas, and tubing size 37 is specifically sized to handle the flow required efficiently without excessive pressure drop or potential hazards.

As the other sizes are either too small—or would lead to an unacceptable pressure drop—using size 37 ensures that the appliance receives a sufficient supply of propane at the proper pressure for functional operation, making it the optimal choice.