Exam Question
Write short notes on following:
(a) Flammability diagram and its significance (10)
(b) Risk assessment: why and how it is carried out on ships with examples (10)
Class 4 (4th Engineer)
SSEP
📅 Jan 2026
Reference Answer
### (a) Flammability Diagram and its Significance
#### 1. Concept and Definition
The Flammability Diagram (also known as a Triangular or Explosive Diagram) is a graphical representation that illustrates the relationship between the concentrations of three components: hydrocarbon gas, oxygen, and an inert gas (typically Nitrogen or a mix of N2 and CO2). Its primary purpose is to define the boundaries of the flammable or explosive range for a mixture of these gases, serving as a critical safety tool for operations in potentially explosive atmospheres, particularly in the cargo tanks of oil and chemical tankers.
#### 2. Components and Key Areas of the Diagram
#### 1. Concept and Definition
The Flammability Diagram (also known as a Triangular or Explosive Diagram) is a graphical representation that illustrates the relationship between the concentrations of three components: hydrocarbon gas, oxygen, and an inert gas (typically Nitrogen or a mix of N2 and CO2). Its primary purpose is to define the boundaries of the flammable or explosive range for a mixture of these gases, serving as a critical safety tool for operations in potentially explosive atmospheres, particularly in the cargo tanks of oil and chemical tankers.
#### 2. Components and Key Areas of the Diagram
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