What is the minimum inside radius of a bend in metallic pipe in a gas system relative to the outside diameter?

In gas piping systems, the minimum inside radius of a bend is crucial for maintaining proper flow and minimizing stress on the pipe. The correct answer indicates that the minimum inside radius should be at least six times the outside diameter of the pipe. This guideline helps to ensure that the gas can flow smoothly without causing turbulence or creating pressure drops that could lead to inefficiencies or operational issues.

Having a larger bend radius reduces the likelihood of kinks or sharp turns, which can compromise the structural integrity of the piping and potentially lead to leaks. By adhering to this minimum inside radius, installers can enhance the reliability and safety of the gas delivery system. The other options suggest smaller minimum radii, which would not provide the same level of performance and safety, increasing the risk of pipe failure and operational problems.