🔍 Key Concepts

• Requirements for vapor control system hoses in 33 CFR (look at Subchapter S, especially parts dealing with vapor collection on tank vessels and facilities) • Why burst pressure, electrical continuity, and vacuum resistance all matter for safe vapor transfer • How exam questions often treat multiple listed requirements: sometimes each item is required; sometimes only one is correct

💭 Think About

• Ask yourself: does the regulation specify only one of these properties for a vapor transfer hose, or are several different properties required at the same time? • Think about what could go wrong during vapor transfer: overpressure, static electricity buildup, or hose collapse under vacuum—would regulations typically ignore any of these hazards? • Consider whether the word “each” in the question suggests a single characteristic or a package of required characteristics

✅ Before You Answer

• Check in 33 CFR that vapor transfer hoses have a minimum design burst pressure requirement and note the exact value • Verify whether the regulation specifically states a maximum resistance value (in ohms) for electrical continuity of vapor hoses • Confirm whether hoses must be able to withstand a specified vacuum (in psi) without collapsing or constricting, and whether all these requirements apply to each hose used for transferring vapors