What is the purpose of the SOP in relation to working in air contaminated by H2S?

• A. To document all incidents.
• B. To specify PPE selection only.
• C. To train workers.
• D. To outline procedures for working in air contaminated by H2S to ensure the maximum exposure limit is not exceeded.

Answer: (D)

The key idea is that an SOP for working in air contaminated by H2S is about defining the exact steps, controls, and responsibilities to carry out the task safely and keep workers’ exposure below the allowed limit. It isn’t just about what PPE to wear or a record of incidents, nor is it only about training. The document sets out how to monitor the atmosphere, how to ventilate the area, when and how to use protective equipment, how permits to work are issued, and what actions to take if gas levels rise or alarms ring. By detailing these procedures, the SOP provides a clear, repeatable pathway to ensure the maximum exposure limit is not exceeded and that there are defined emergency and rescue procedures if conditions deteriorate.