MCC-NH Gas Fitters Practice Exam

What activity should follow after purging gases outdoors?

1. Instigate a pressure test

2. Allow sufficient ventilation

3. Start normal operations

4. Continue purging until cleared

The correct answer is: Start normal operations

Following the purging of gases outdoors, the appropriate activity is to start normal operations. This step is critical because once the purging process has been completed effectively, it indicates that the system is clear of potentially hazardous gas mixtures. Starting normal operations ensures that the system can function safely and efficiently. Prior procedures, such as purging, serve to remove any residual gases and mitigate risks associated with gas leakage or combustion, allowing for safe operation under regular conditions. The other activities listed are either preliminary steps or not relevant once purification is confirmed. For instance, instigating a pressure test would typically occur before or as part of preparation for operations, rather than following a purging process. Allowing sufficient ventilation is crucial during the purging phase, but once that process is completed and the environment is deemed safe for operations, it is no longer the immediate concern. Continuing to purge until cleared would not be necessary if confirmation has been made that the area is safe and clear from harmful gases. Thus, moving into normal operations signifies readiness to proceed with the intended use of the gas systems.