How often shall gas examinations be made in face areas where equipment is operating?

How often shall gas examinations be made in face areas where equipment is operating?

• A. At least every 20 minutes
• B. At least every 60 minutes
• C. Only when gas odors are detected
• D. Every hour

Answer: (A)

Gas examinations must be frequent in face areas where equipment is operating because machinery can release methane and other gases directly into the working space, and conditions can change quickly as ventilation and airflow at the face shift. Regular checks help catch dangerous gas buildup early so work can be stopped and ventilation adjusted before an explosion hazard develops. Odor is not a reliable indicator, and gas can be present without any smell, so testing at regular intervals is essential. The required frequency is at least every 20 minutes, ensuring timely detection under dynamic face conditions.

Gas examinations must be frequent in face areas where equipment is operating because machinery can release methane and other gases directly into the working space, and conditions can change quickly as ventilation and airflow at the face shift. Regular checks help catch dangerous gas buildup early so work can be stopped and ventilation adjusted before an explosion hazard develops. Odor is not a reliable indicator, and gas can be present without any smell, so testing at regular intervals is essential. The required frequency is at least every 20 minutes, ensuring timely detection under dynamic face conditions.