MCC-NH Gas Fitters Practice Exam

What is the minimum wall thickness for black iron steel pipe?

1. Schedule 5

2. Schedule 10

3. Schedule 40

4. Schedule 80

The correct answer is: Schedule 10

The minimum wall thickness for black iron steel pipe typically corresponds with Schedule 10. Black iron pipe is commonly used for gas distribution and related applications, and the schedule indicates the wall thickness of the pipe. Schedule 10 black iron steel pipe has a thinner wall than other schedules, making it suitable for lower pressure applications like gas piping. In gas fittings and installations, adhering to the proper specifications for wall thickness is crucial for ensuring safety and efficiency. Schedule 10 is designed to provide adequate strength and support for typical gas applications while remaining lightweight and cost-effective. On the other hand, schedules with thicker walls, such as Schedule 40 or Schedule 80, provide greater strength and are used for higher pressure services, which are not always necessary for standard gas fittings. Thus, when specifically considering the minimum required thickness for black iron steel pipe, Schedule 10 is the appropriate choice.