MCC-NH Gas Fitters Practice Exam

What is the minimum length of unthreaded pipe that must protrude from walls or ceilings?

1. 1 inch

2. 2 inches

3. 3 inches

4. 4 inches

The correct answer is: 1 inch

The minimum length of unthreaded pipe that must protrude from walls or ceilings is specified to ensure safe and proper installation of gas piping. A protrusion of at least 1 inch is required for several important reasons. This length allows adequate access to the pipe for any necessary fittings or connections without risking damage to the wall or ceiling materials during installation or maintenance. It also serves as a safety feature, providing enough length to prevent any potential issues that may arise during the connection of additional fittings or appliances. This requirement aligns with best practices in gas work, ensuring that installations are not only functional but also adhere to safety standards. In contrast, longer lengths like 2, 3, or 4 inches may exceed typical requirements for most installations, potentially leading to unnecessary challenges in terms of aesthetics and integration within walls or ceilings without adding practical benefits. Therefore, the 1-inch requirement strikes a balance between safety, practicality, and compliance with relevant regulations.