🔍 Key Concepts

• Sea chest design and purpose in machinery space sea water cooling systems • Common methods used on ships to clear blockages (like mud, marine growth, or ice) from sea chests and sea suctions • Which systems on board are normally fitted with dedicated blow or purge connections to clear intakes while underway

💭 Think About

• Think about which type of connection can safely and effectively dislodge ice from the sea chest while the system is in use without introducing contaminants into the cooling water circuit. • Consider which system is commonly used to blow or purge sea suctions and sea chests clear of obstructions like mud or ice on seagoing vessels. • Ask yourself: which of these options sounds like a standard, purpose‑designed feature you would expect a shipyard to install on sea chests, rather than a special or unusual modification?

✅ Before You Answer

• Verify which system on board is typically arranged with a blow-through line directly to the sea chest or sea suction. • Check whether using chemicals or fire main water into the cooling circuit would be standard practice or potentially hazardous/contaminating. • Confirm which connection type is specifically associated with clearing obstructions from sea chests in engineering references or training materials.