🔍 Key Concepts
• Ballast system layout on the DEEP DRILLER as shown on the piping diagram for Sample Load Form #4
• The function and normal position of valves 19, 20, and the manifold/cross‑over valves in the starboard tanks
• How deballasting from 9S via 8S requires a continuous open path from tank 9S to the pump
💭 Think About
• On the ballast diagram, trace the flow you want: from tank 9S into tank 8S, then from 8S to the pump. Which specific valve number completes that path when 19 is stuck closed and 20 is open?
• Compare what each choice (17, 18, 21, 35) actually connects on the drawing. Does it connect 9S to 8S, or 8S to a manifold that already has 9S on it, or something unrelated?
• Think about which valve, if opened with 20, will still respect the normal segregation of port and starboard systems while allowing deballast from 9S through 8S.
✅ Before You Answer
• Confirm on the piping plan exactly what valve 19 connects and why its failure in the closed position blocks your original route.
• For each answer choice, check the label and line that valve number is on: is it on the 9S–8S connection or on some other tank/line?
• Verify that with valves 20 and your chosen valve open, there is a complete, unbroken line from 9S to the pump, with no required valve remaining closed in that path.