🔍 Key Concepts

• Meaning of the word header in piping systems • How multiple tank vent lines are arranged on larger vessels • Differences between flame arresters, overflow arrangements, and water traps

💭 Think About

• Think about what a header pipe does in any plumbing or piping system—what is its basic function? • Which choice describes a system‑level function (affecting several vents), rather than a safety feature at a single vent opening? • Ask yourself: which option sounds like a description of a special fitting (like a flame screen or gooseneck) instead of a whole piping arrangement?

✅ Before You Answer

• Identify which option deals with multiple vent lines together, not just one opening • Separate fire protection functions from piping arrangement functions • Distinguish between preventing overflow and simply providing a common route for vapors