🔍 Key Concepts

• Requirements for hot work (welding, cutting) in spaces that carried flammable liquids • Who is authorized under U.S. regulations to declare a tank "safe for hot work" • Difference between regulators (like the Coast Guard), class societies (like ABS), and technical specialists (like chemists)

💭 Think About

• Which of these choices actually conducts gas tests and evaluates vapors inside tanks before hot work? • Does the Coast Guard or a fire department usually do continuous gas testing and issue certificates, or do they rely on a specialist? • What kind of training or certification is needed to understand flammable limits, oxygen levels, and toxic vapors in an enclosed tank?

✅ Before You Answer

• Verify which option is specifically trained and certified to perform atmospheric testing for hot work in tanks • Consider which organization normally issues a written certificate stating a space is safe for hot work • Eliminate any options that mainly provide oversight/approval or emergency response, rather than doing the technical gas testing themselves