🔍 Key Concepts

• corrosion and how seawater affects metal surfaces over long idle periods • the purpose of sea valves when a plant is shut down or laid up • difference between leaving systems wet, drained, or dried for preservation

💭 Think About

• What happens to the saltwater side metal surfaces if oxygenated seawater is left standing in contact with them for months? • How do open vs. closed sea valves affect the introduction of fresh, oxygenated seawater into an idle system? • For long‑term lay‑up, do you want stagnant seawater in the condenser, or no seawater at all on the saltwater side?

✅ Before You Answer

• Consider which choice best prevents corrosion over an indefinite period • Check which options require the sea valves to be closed for safety and flooding prevention • Ask whether the best preservation method leaves the condenser wet with seawater or empty/dry on the saltwater side