What is the minimum inside radius of a bend in a metallic gas pipe?

• A. Three times the outside diameter of the pipe
• B. Four times the outside diameter of the pipe
• C. Five times the outside diameter of the pipe
• D. Six times the outside diameter of the pipe

Answer: (D)

The minimum inside radius of a bend in a metallic gas pipe is specified as six times the outside diameter of the pipe due to several important factors regarding flow and structural integrity. This standard ensures a smooth transition when gas flows through the pipe, which minimizes pressure drops and turbulence that can occur with tighter bends.

Adhering to this measurement also helps to maintain the strength and durability of the pipe. A bend that is too tight can cause stress concentrations, which might lead to cracking or failure over time, especially in metallic piping that is subject to fluctuations in pressure and temperature.

Additionally, following this specification is crucial for compliance with safety regulations, as gas lines must be installed in a manner that prevents leaks and other hazards. Therefore, the six times outside diameter guideline ensures that the gas piping system is both functional and safe for residential use.