SAFETY ENG - TMA 1 4. Classify the following situations in terms of type of risk

Question

SAFETY ENG - TMA 1 4. Classify the following situations in terms of type of risk and complete the risk table by assigning probabilities between 0 (not possible) and 1 (certain) with 0.1 – 0.3 (low), 0.4 – 0.6 (average), 0.7 – 0.9 (high) for injury and equipment damage for each hazard. State concisely the reasons for your choices and any qualifications you feel are required. Factors such as weather, location and population density should be considered and stated. (i) Object falling from scaffold. (ii) Tripping over a low level pipe in a petrochemical plant whilst on nightshift. (iii) Electric shock from overhead cable/line struck by lightning. (iv) Radioactive leak into a river from nuclear power station. (v) Electricity supply interruption in an equipment store with emergency lighting. (vi) Not replacing a walkway grating on an oil rig. (vii) Hydrogen sulphide release from pocket in the end of a blanked off pipe in a crude oil fractionation plant.

Orindary Risk Residual Risk Process Risk Societal Risk ProbabilityProbability of Injury Situatiorn of Damage (iii) (iv) (vi) vii)

Explanation / Answer

Ordinary risk

Object falling is a societal risk as is can harm/injur as well as damage the property to some extent

Tripping at night is purely process risk due to low lightings. It has a very hight certainty of injury on site though damage of property is less.

Electric shock is a residual risk as the ducts are not closed properly after construction It has fair chances of fire leading to loss of lives and damage too.

River releases are residual as they severely harm the lives after the process.

Electricity interruption are ordinary and can happen anytime leading an uncertain material damage.

Situation

Ordinary risk

Residual risk process risk societal risk Probability of injury Probability of damage 1 Y 0.5 0.2 2 Y 0.9 0. 3 Y 0.5 0.5 4 Y 0 0.7 5 Y 0 0.4 6 Y 0.8 0 7 Y 0.9 0.9

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