🔍 Key Concepts

• Gas-free certificate purpose and when it is needed (e.g., tanks, confined spaces, hot work) • Who is specially trained and qualified to test atmospheres on ships (look for words like certified or chemistry/atmosphere expert) • Difference between operational roles (engineer, surveyor, inspector) and atmospheric safety specialist

💭 Think About

• Which of these people is specifically trained and authorized to test for flammable, toxic, and oxygen-deficient atmospheres and then sign a formal certificate? • Who normally checks ship structure and class/condition versus who actually measures gas concentrations inside spaces? • When a repair yard wants to do hot work in a tank, who must usually issue the certificate before work can begin?

✅ Before You Answer

• Identify which role’s primary job is atmospheric testing and declaring spaces safe for entry or hot work, not general inspection or engineering • Check which title explicitly implies formal qualification/certification to evaluate gases and issue documents • Eliminate choices whose main duties are structural surveys, regulatory inspections, or maintenance management, rather than gas testing