MCC-NH Gas Fitters Practice Exam

Why is it important to purge gas lines prior to service?

1. To remove all contaminants

2. To ensure there is no combustible gas present

3. To maintain gas quality

4. To comply with safety regulations

The correct answer is: To comply with safety regulations

Purging gas lines before service is essential for safety reasons. This process ensures that any potential hazards associated with combustible gases are mitigated. Gas lines can trap various gases that might pose safety risks, including flammable gas. By purging, all remnants of these gases are removed, thereby promoting a safe working environment for technicians and avoiding the possibility of gas leaks or explosions during maintenance or repair work. While other options highlight important aspects of purging, such as maintaining gas quality and ensuring contaminants are removed, the primary concern in this context is compliance with safety regulations. Regulations typically mandate that all safety precautions, including purging gas lines, must be followed to prevent accidents and ensure the safety of workers and the public.