TASCO Exit Exam • Set 2 Question 26 of 30

What is Upper flammable limit?

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Direct Answer

Option B: The concentration of a hydrocarbon gas in air above which there is insufficient oxygen to support combustion

The Upper Flammable Limit (UFL) is the maximum concentration of a hydrocarbon gas in air above which the mixture is too 'rich' (insufficient oxygen) to support combustion.

All Options

The limit where there is too much inert gas to support combustion

The concentration of a hydrocarbon gas in air above which there is insufficient oxygen to support combustion (Correct Answer)

The limit for man entry of personnel into tanks

The limit where there is insufficient inert gas to support combustion

Detailed Explanation & Context

The Upper Flammable Limit (UFL) is the maximum concentration of a hydrocarbon gas in air above which the mixture is too 'rich' (insufficient oxygen) to support combustion.

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

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Q1 What documented record must be maintained on board following completion of tasks related to regulatory compliance and STCW code requirements in Advanced Oil Tanker Cargo? Q2 What type of personal protective equipment (PPE) is essential when handling emergency procedures and alarm protocols under Advanced Oil Tanker Cargo guidelines? Q3 What parameter must be verified prior to authorizing enclosed space entry for emergency procedures and alarm protocols related to Advanced Oil Tanker Cargo? Q4 What key responsibility belongs to seafarers performing watchkeeping duties for emergency procedures and alarm protocols under Advanced Oil Tanker Cargo? Q5 Which document contains detailed hazard data and emergency handling instructions for substances involved in emergency procedures and alarm protocols during Advanced Oil Tanker Cargo? Q6 Regarding emergency procedures and alarm protocols in Advanced Oil Tanker Cargo, what is the mandatory safety standard required under STCW Code Table A-V/1-1? Q7 What is the primary function of an Inert Gas System (IGS) aboard crude oil tankers? Q8 Under MARPOL Annex I, what is the maximum instantaneous rate of oil discharge allowed from cargo tank areas of oil tankers? Q9 What device measures oxygen concentration continuously in the main inert gas supply line? Q10 What safety device prevents reverse flow of hydrocarbon gas from cargo tanks into the engine room boiler stack?