What rule applies to solder joints on underground gas lines?

In the context of underground gas lines, the applicable rule states that no solder joints are allowed. This is primarily due to the fact that soldering can introduce joints that are susceptible to leaks over time, especially when subjected to the pressures and conditions present in gas applications.

Underground gas lines need to ensure maximum safety and reliability; thus, using mechanical fittings or welding is preferred to create a strong, leak-proof connection. This adheres to safety standards that govern gas pipe installations. The use of solder not only presents potential issues with integrity but can also introduce materials that may alter the composition of the gas or lead to corrosion.

Understanding the plumbing and gas fitting regulations is essential for maintaining safety and compliance in installations, and this rule is a critical component of that framework.