In an inert gas system, high pressure alarms...

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Question 1 of 205eccef9dbacbc34ba4d45d12

In an inert gas system, high pressure alarms are set in the main vapor collection line to cause an audible and visual alarm if the pressure reaches a certain level. What is the percentage of the lowest relief valve setting at which the alarm must sound?

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🔍 Key Concepts

• Inert gas system safety limits for cargo tanks on tankers • Relationship between alarm settings and relief valve (PV valve) set pressure • Why alarms must activate before any structural or equipment safety device operates

💭 Think About

• Think about how early an alarm should warn the crew before the pressure reaches the point where the lowest relief valve might lift. • Consider whether the alarm should be set well below, just below, or almost equal to the lowest relief valve setting for safe operation. • Ask yourself: if the alarm setpoint is too close to the relief valve setting, what risk does that create for response time and equipment protection?

✅ Before You Answer

• Verify what percentage of the lowest relief valve setting is specified in standard inert gas system rules (SOLAS / tanker cargo tank venting guidance). • Make sure you are thinking about the lowest relief valve set pressure, not design pressure or maximum allowable working pressure. • Check which option best reflects a conservative safety margin that still gives a realistic, actionable warning (not too low to be nuisance, not too high to be too late).

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