In a workshop three hazards have been identified:

1. Continuous noise level of 92 dB(A) for 6 h per day.
2. A chemical vapour with an average concentration of 0.08 mg m⁻³, where the permissible exposure limit (PEL) is 0.05 mg m⁻³.
3. Manual handling of a 25 kg load that is lifted 30 times each shift.

Using the hierarchy of controls (elimination, substitution, engineering controls, administrative controls, personal protective equipment), rank the hazards from highest to lowest priority for control and state the most appropriate control measure for each hazard.

Question

In a workshop three hazards have been identified:

1. Continuous noise level of 92 dB(A) for 6 h per day.
2. A chemical vapour with an average concentration of 0.08 mg m⁻³, where the permissible exposure limit (PEL) is 0.05 mg m⁻³.
3. Manual handling of a 25 kg load that is lifted 30 times each shift.

Using the hierarchy of controls (elimination, substitution, engineering controls, administrative controls, personal protective equipment), rank the hazards from highest to lowest priority for control and state the most appropriate control measure for each hazard.

Accepted Answer

1. Chemical vapour - install local exhaust ventilation (engineering control).
2. Noise - rotate workers to limit exposure and provide hearing protection (administrative control).
3. Manual handling - use a mechanical lifting aid such as a hoist (engineering control).

City Guilds Model Questions Vol1 2020 Engineering Question 29

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