CHEMCO Exit Exam • Set 2 Question 11 of 30

What parameter must be verified prior to authorizing enclosed space entry for regulatory compliance and STCW code requirements related to Advanced Chemical Tanker?

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Direct Answer

Option D: Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration

Prior to enclosed space entry, atmospheric testing is paramount. Verifying oxygen levels at 20.9% and ensuring zero toxic/flammable gas concentration is essential for safety, as per ISGOTT and P&A Manual guidelines, preventing asphyxiation or explosion risks.

All Options

Oxygen level at 15% with ventilation turned off

Temperature check only

Visual inspection through access hatch without gas testing

Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration (Correct Answer)

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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More Questions in CHEMCO Set 2

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Q1 What is the function of inert gas on chemical tankers carrying cargoes with flashpoints below 60°C? Q2 What hazard is associated with Benzene cargo exposure? Q3 What is closed gauging on a chemical tanker? Q4 What chemical condition causes Phenol to solidify at temperatures below 40°C? Q5 How frequently must operational drills and practical checks for regulatory compliance and STCW code requirements be conducted for Advanced Chemical Tanker? Q6 What documented record must be maintained on board following completion of tasks related to regulatory compliance and STCW code requirements in Advanced Chemical Tanker? Q7 What chemical cargo property is defined as the lowest temperature at which liquid emits flammable vapor? Q8 What is the function of a toxic vapor return line during chemical loading? Q9 What is the role of an Inhibitor Certificate for chemical cargoes prone to polymerization? Q10 What type of personal protective suit provides complete gas-tight isolation against fatal chemical atmospheres?