Red Seal Gasfitter — Class A Practice Exam

When should a gas line be pressure tested?

1. Only if there are visible signs of wear

2. Before the device is sold

3. After installation, repairs, or alterations to ensure there are no leaks

4. Every five years as a legal requirement

The correct answer is: After installation, repairs, or alterations to ensure there are no leaks

A gas line should be pressure tested after installation, repairs, or alterations to ensure there are no leaks. This practice is vital for safety in gas systems because any leak poses a significant risk of fire or explosion. Conducting a pressure test helps to verify the integrity of the gas line and confirm that all joints, fittings, and connections are secure. It also ensures compliance with relevant codes and standards that require testing to safeguard the end users. While visible signs of wear may indicate the need for further inspection or maintenance, it is not sufficient alone to warrant immediate pressure testing without the context of installation or repair. Pre-sale inspections may be necessary, but these do not specifically mandate testing unless there have been modifications. Additionally, while regular testing every five years may be a requirement in certain jurisdictions, it does not specifically apply to the context of new installations or repairs; rather, it is about maintaining the ongoing safety of older systems. Thus, conducting pressure tests after any work ensures immediate verification of the system's safety and reliability.