ICC Commercial Mechanical Practice Exam

Black steel pipe is the preferred choice for natural gas service in commercial buildings due to several important characteristics. This type of piping is specifically designed to withstand high pressures associated with gas distribution systems. Its durable and robust construction ensures a reliable seal, which is critical in preventing leaks that could lead to hazardous situations.

Moreover, black steel pipe is resistant to corrosion and can handle the expansion and contraction that occurs with temperature changes, making it well-suited for various environmental conditions. The smooth interior surfaces of black steel pipe also help maintain an efficient flow of gas through the system, minimizing the risk of pressure drops.

In contrast, galvanized steel pipe, while capable of being used for gas service, is less common due to potential corrosion issues when the galvanization wears off. PVC pipe is generally not appropriate for natural gas due to its inability to withstand high temperatures and pressures, plus it lacks the necessary mechanical strength for such applications. Copper pipe, although used in some applications, is more suited for water lines rather than gas due to its higher material costs and potential reaction with gas components.

The attributes of black steel pipe align perfectly with the requirements for safe and effective natural gas transmission, thereby making it the standard in the industry.