Your vessel is securely moored to the berth preparing to discharge a cargo of LPG. Which of the following items would not comply with a "Safety Checklist" and should be corrected?
• Inert gas system (IGS) purpose and normal operating condition for deck water seal • Typical oxygen limits in cargo tanks when carrying LPG • Items normally required to be in service and ready before starting cargo operations
• Ask yourself: When preparing to discharge LPG, should the inert gas / deck seal arrangement be in operation, on standby, or isolated? • Consider which checklist item describes a condition that would usually be considered unsafe or abnormal just before cargo transfer begins. • Think about which of these four items, if left as stated, could most directly allow air (and therefore higher oxygen) to enter the cargo system.
• Verify from your tanker safety notes what the normal status of the deck water seal should be before cargo operations. • Confirm the typical maximum oxygen percentage allowed in LPG cargo tanks before discharge starts. • Check which systems are normally required to be operational and not bypassed or drained on a gas carrier’s pre-transfer safety checklist.
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