🔍 Key Concepts

• 46 CFR Part 56 – Piping Systems and Appurtenances material requirements • Typical materials allowed for sea water / keel cooler piping and valves • Corrosion, strength, and fire resistance requirements for hull penetrations and seawater connections

💭 Think About

• Which of the listed materials is commonly approved for valves in seawater service on inspected vessels? • Think about strength at temperature and fire resistance: which materials would still be safe if there were an engine room fire? • Which materials are prohibited or restricted in sea connections because of corrosion or mechanical weakness?

✅ Before You Answer

• Check which materials 46 CFR Part 56 allows for valves in sea water and cooling systems, especially at hull penetrations • Verify if non‑metallic (plastic) materials are permitted for isolation valves in keel cooler installations under 46 CFR • Confirm whether copper and aluminum are normally accepted as valve body materials in seawater service or if they are limited/prohibited due to corrosion and strength issues