Why is it important to use malleable iron fittings with steel pipe?

Using malleable iron fittings with steel pipe is important primarily because they provide a reliable connection. Malleable iron has a high tensile strength and is designed to work harmoniously with steel pipe, which is typically used in gas lines. The flexibility and strength of malleable iron allow it to withstand the pressures and stresses that occur in piping systems, ensuring that joints remain secure and leak-free over time.

In gas installations, maintaining the integrity of connections is critical for safety and operational efficiency. When malleable iron fittings are correctly installed on steel pipes, they create a durable interface that can accommodate slight movements caused by thermal expansion and contraction. This ensures the longevity of the installation and minimizes the risk of leaks that can lead to hazardous situations.

Other options, while they might hold some merit in different contexts, do not directly address the fundamental reason for using malleable iron fittings in conjunction with steel pipes in gas systems. The emphasis is on constructing a safe and effective piping infrastructure, which is paramount in gas installations.