OCTCO/OCTF Exit Exam • Set 1 Question 19 of 30

What equipment measures hydrocarbon vapor concentration in zero-oxygen inert atmospheres?

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Direct Answer

Option D: Tankscope / Infrared Gas Analyzer

Catalytic explosimeters require oxygen to function and fail in inert atmospheres. According to ISGOTT and inert gas operational protocols, Tankscopes and infrared gas analyzers must be utilized to accurately measure hydrocarbon concentrations in oxygen-deficient spaces.

All Options

Catalytic explosimeter

Hydrometer

Litmus paper

Tankscope / Infrared Gas Analyzer (Correct Answer)

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).

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More Questions in OCTCO/OCTF Set 1

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Q1 What MARPOL Annex regulates prevention of oil pollution from tankers? Q2 What is the maximum oxygen content allowed in inert gas supplied to cargo tanks? Q3 What operation uses crude oil jets to clean sludges from tank walls during discharge? Q4 What condition is mandatory before starting Crude Oil Washing (COW)? Q5 What system monitors and controls oily water discharge overboard from slop tanks? Q6 What is the maximum instantaneous rate of oil discharge allowed outside Special Areas under MARPOL Annex I? Q7 What device stops hydrocarbon gas backflowing from cargo tanks into the machinery space? Q8 What instrument measures flammable vapor concentration as a percentage of LEL? Q9 What is Reid Vapor Pressure (RVP)? Q10 What device protects oil cargo tanks against overpressure or vacuum structural damage?