🔍 Key Concepts

• Direct vs. indirect (closed) cooling systems on diesel engines • Regulatory focus on redundancy and protection in seawater cooling circuits • Purpose and placement of strainers, sea suctions, and temperature monitoring in cooling systems

💭 Think About

• Think about which components are most vulnerable to fouling or blockage when seawater is used and where protection is most effective. • Consider what regulations typically require to ensure continued cooling if one flow path is blocked or equipment fails. • Ask yourself: for large-bore engines, what is more critical from a safety point of view—monitoring each cylinder separately, or protecting the cooling flow path as a whole?

✅ Before You Answer

• Verify which items are commonly required by classification societies and SOLAS/46 CFR for seawater cooling arrangements (focus on redundancy and strainers). • Check whether it is standard practice that each engine must have its own pump or if pumps can be shared/standby in many installations. • Consider where strainers are normally installed in a seawater cooling system: relative to sea chests, pumps, and heat exchangers.