When using copper pipe and fittings with soft solder for saturated steam, what is the maximum pressure rating?

When using copper pipe and fittings joined with soft solder for saturated steam applications, the maximum pressure rating is critical for ensuring safety and proper functionality. The correct answer indicates a maximum pressure rating of 15 psi at 250 °F, which aligns with industry standards for the use of soft solder in these conditions.

Soft solder is known for its lower strength compared to brazed or welded joints, especially when exposed to higher temperatures. The combination of 15 psi and 250 °F serves to limit the risk of joint failure or leaks. Copper itself has excellent thermal conductivity and resistance to corrosion, but the limitations imposed by soft solder joints require careful adherence to established pressure ratings to avoid catastrophic failures.

For the other options, the pressure ratings exceed the safe limits for soft solder applications under saturated steam conditions, as they suggest excessively high pressures or temperatures that could compromise the integrity of the soldered joints. It's important to refer to codes and standards, such as those from ASME or other relevant organizations, which dictate these maximum allowable pressures based on the material and joining technique used.