🔍 Key Concepts

• Design limits of cargo and P-tank systems on offshore supply vessels • Typical working pressure of cargo tanks versus high-pressure air systems on board • Consequences of over-pressurizing a P-tank (structural damage, hose failure, tank rupture)

💭 Think About

• Compare the pressures listed to what you would expect for thin‑walled cargo tanks and hoses on a supply boat—are they designed for high or low pressure? • Think about which pressures are more typical for shop air systems or SCBA cylinders and which are more likely for a cargo tank pressurization system. • Ask yourself: if a tank or hose failed at this pressure while offloading cargo at the rig, which pressures would be obviously excessive for safe routine operations?

✅ Before You Answer

• Verify which answer choice best matches a low, controlled pressure appropriate for tank pressurization, not power tools. • Eliminate any pressures that are clearly in the range of high‑pressure air systems (e.g., compressors feeding tools, starting air, or SCBA filling). • Focus on the option that aligns with safe, conservative operation of cargo and P‑tank systems rather than maximum possible pressure.