🔍 Key Concepts

• 46 CFR fuel oil system piping requirements • Differences between standard pipe fittings versus special-change-of-direction fittings • Why certain fittings are more prone to leakage or failure in vibration/heat

💭 Think About

• Think about which type of fitting is most likely to be mechanically weaker or more prone to leakage under vibration and thermal cycling in a fuel oil discharge line. • Consider which fittings are normally accepted and commonly seen in approved fuel oil piping systems on inspected vessels. • Ask yourself which fitting creates the greatest risk if it fails suddenly in a high‑pressure, flammable liquid system.

✅ Before You Answer

• Check 46 CFR requirements for fuel oil service and discharge piping to see which fittings are specifically restricted or prohibited. • Identify which fittings are expressly permitted (like certain unions or flanged connections) and which are not. • Verify which fitting type may be considered an eccentric or non-standard change-of-direction fitting that can concentrate stress in the line.