🔍 Key Concepts

• Look closely at the piping symbols and valve symbols used at the cargo/bilge manifolds in GS-0042 • Recall the differences between a gate valve, a stop valve, and a check (non‑return) valve in typical engineering drawings • Think about why some valves must be operable from above the bulkhead deck on tankers for damage control and flooding safety

💭 Think About

• From the symbol, can flow move in one direction only, or can the valve be used simply to start/stop flow in either direction? • Does the diagram show any remote operating gear or reach rods leading up through decks that would indicate remote operation from above the bulkhead deck? • On a cargo/bilge manifold, what is the main function of these valves: isolation only, or isolation plus automatic back‑flow prevention?

✅ Before You Answer

• Verify the exact symbol at each manifold valve and compare it with standard symbols for gate, globe (stop), and check valves in your reference materials • Check whether any valve is marked or drawn as a combined stop‑check valve rather than a simple stop valve • Confirm if the drawing includes any notation or symbol for remote operation from above the bulkhead deck; if not clearly shown, eliminate choices that require this feature