MCC-NH Gas Fitters Practice Exam

Under what circumstances does a pressure test usually occur?

1. When establishing a maintenance schedule

2. During new branches or new installations

3. Before any system inspection occurs

4. When a leak is suspected in the system

The correct answer is: During new branches or new installations

A pressure test is typically conducted during new branches or new installations to ensure the integrity and safety of the gas system. This process is vital because it verifies that the installation does not have any leaks and is capable of operating safely at the expected pressure levels. By performing a pressure test during installation, gas fitters can confirm that the system meets required codes and standards, preventing potential hazards before the system is put into service. While tests can be beneficial in other scenarios, such as when a leak is suspected or before a system inspection, the primary focus of a pressure test is most crucial at the point of installation or when adding new components. This approach ensures that all parts of the gas system are functioning correctly and safely right from the beginning. Continuous monitoring and testing may occur later in the system's lifetime, but the most critical need for pressure testing arises with new work to validate the integrity of the installation.