🔍 Key Concepts

• Inert gas system requirements for tankers engaged in crude oil washing (COW) under SOLAS and IMO guidelines • The maximum allowed oxygen content in the inert gas delivered to cargo tanks • The difference between ideal (theoretical) 0% oxygen and the realistic regulatory limit used in practice

💭 Think About

• Think about why total 0% oxygen is not a realistic requirement in shipboard systems and what a safe upper limit would be to prevent combustion in cargo tanks. • Recall the SOLAS/IMO standard figure for the maximum oxygen content by volume in inert gas supplied to tanks during crude oil washing. • Compare the answer choices and decide which one matches the widely accepted regulatory limit for inert gas oxygen content, rather than a perfect or approximate value.

✅ Before You Answer

• Verify the SOLAS / IMO crude oil washing and inert gas system oxygen limit (by volume) that must not be exceeded when delivered to the tanks. • Confirm that the value in the rule is a maximum allowable percentage, not a target of 0%. • Check that the option you choose matches the specific numerical limit used internationally for inert gas systems on tankers.