Safety, Standards, and Professional Practice
Safety, Standards, and Professional Practice covers the obligations surrounding the work: controlling hazards in the right order, following standards and permit systems, keeping measurements traceable, and behaving with the integrity the certificate implies.
Hierarchy of control
In order of preference: elimination, substitution, engineering controls, administrative controls, then personal protective equipment. PPE is the last line of defence and is used when higher controls cannot remove the risk. A hazard is the source of harm; risk is the likelihood and severity of harm from it. Report incidents and near misses - a near miss is an event that could have caused harm.
Standards and documents
- Standards are consensus documents: ISO and IEC internationally, ASTM for many materials and test methods, with national bodies adopting them. Regulations are legally enforceable and take precedence over a standard.
- Safety data sheets have 16 sections; sections 2, 4, 7, and 8 cover hazards, first aid, handling and storage, and exposure limits.
- Document control means only current revisions are available at the point of use, with superseded copies withdrawn.
- Traceability runs from your instrument to a working standard, then a reference standard, then a national metrology institute. Uncertainty grows at each link.
Worked example
A pump room measures 95 dB(A) at the operator position against an eight-hour limit of 85 dB(A).
- Elimination: specify a quieter pump at the design stage - best, but not available now.
- Engineering: enclose the pump or relocate the control station, removing exposure at source.
- Administrative: rotate staff to cut time in the room.
- PPE: hearing protection as the final layer while the enclosure is installed. Reasoning: PPE alone would look compliant on paper but leaves the hazard in place. The exam expects the highest practical control first, with PPE supporting it, not replacing it.
Traps that cost marks
- Jumping straight to PPE as the answer.
- Treating hazard and risk as synonyms.
- Skipping a permit because the job is short.
- Signing off work you did not personally witness or test.
- Working outside your competence instead of escalating.