What is the maximum percent of oxygen, by...

Question 1 of 3104866636ee728f7522a1c5180fa

What is the maximum percent of oxygen, by volume, allowed to be maintained in the cargo tanks prior to the commencement of crude oil tank washing?

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Question 1 of 31048

What is the maximum percent of oxygen, by volume, allowed to be maintained in the cargo tanks prior to the commencement of crude oil tank washing?

🔍 Key Concepts

• Inert gas system requirements for crude oil washing operations • The definition of lower flammable limit (LFL) and how oxygen concentration relates to flammability • Requirements for oxygen content in cargo tanks before starting crude oil washing in 46 CFR and SOLAS

💭 Think About

• Think about why inert gas is used during crude oil washing and what the main safety objective is regarding oxygen and flammability. • Consider the typical maximum oxygen percentage that keeps a tank atmosphere safely "inert," i.e., well below the level at which hydrocarbon vapors can ignite. • Compare each answer choice to commonly accepted inerting limits and ask: which one is recognized as the upper safe limit for oxygen in cargo tanks during COW operations?

✅ Before You Answer

• Verify in 46 CFR and SOLAS Chapter II-2 / COW guidelines what maximum oxygen volume percent is specified for cargo tanks before crude oil washing. • Confirm that the chosen percentage represents a condition where the atmosphere is non-flammable for crude oil vapors under normal operating conditions. • Check that your selected value matches the standard figure used in industry guidance for inert gas systems on crude oil tankers.