Question 1 of 7: The Engineer's Role in Safety and the Three E's

Question 1: The Engineer's Role in Safety and the Three E's (20 marks: 7/7/6)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

(i) General Engineering Activities Requiring Hazard Recognition

• Design of products, equipment, plant, structures and processes.
• Selection and specification of materials, machinery and equipment.
• Plant layout and workplace design — arrangement, access, ventilation, lighting.
• Process design and operation — chemical, mechanical, energy handling.
• Construction, installation, commissioning.
• Operation and maintenance planning; modification of existing systems.
• Decommissioning/disposal. At each stage the engineer must recognize hazards and build in controls.

(ii) Design-Engineering Activities to Eliminate/Reduce/Control Risk

• Design out the hazard (inherent safety) — eliminate hazardous materials, energies or operations at the design stage.
• Substitute less hazardous materials/processes.
• Engineering controls into the design — guarding, enclosure, interlocks, ventilation, fail-safe and redundancy, pressure relief, containment.
• Ergonomic design — fit the task to the worker (controls, reach, posture, manual-handling aids).
• Adequate safety factors and design codes/standards.
• Provide for safe maintenance — isolation points, access, lockout capability.
• Follow the hierarchy: eliminate → substitute → engineering controls, before relying on procedures or PPE.

(iii) The Three E's of Safety

• Engineering — designing/modifying the workplace and equipment to remove or control hazards at source (the most reliable E, since it does not depend on behaviour).
• Education — training and informing workers and supervisors: hazard awareness, safe procedures, use of controls and PPE.
• Enforcement — establishing rules/standards and ensuring compliance through supervision, discipline and accountability.
• All three are needed and complementary: engineering makes the workplace safe, education ensures people know how to work safely, and enforcement ensures they actually do.