Hazards, Risks, and Personnel Safety in Field Activities
What the exam expects
Internal corrosion work involves field activities that carry their own hazards. You must connect corrosion-control tasks to safety hazards and to the hierarchy of controls.
Key hazard categories:
- Process hazards: H2S exposure (toxic, odorless at high concentration), hydrocarbon release, pressure, and oxygen deficiency in confined spaces.
- Physical hazards: working at height, lifting, electrical, and rotating equipment.
- Chemical hazards: inhibitors, biocides, and solvents; SDS review and PPE selection.
- Activity-specific hazards: intrusive sampling, coupon and probe retrieval, pigging, and vessel entry.
Traps in questions
- Relying on odor to detect H2S; high concentrations deaden the sense of smell.
- Treating PPE as the primary control instead of the last line of defense.
- Skipping gas testing and permit-to-work for confined space entry.
- Assuming a non-intrusive method is risk-free; it still requires access and isolation.
Worked example
A technician must retrieve a corrosion coupon from a pressurized line. The correct sequence is isolation, depressurization, gas test, permit, PPE, and retrieval with a rated tool, and the hazard review must cover H2S and residual pressure. Rule of thumb: apply the hierarchy of controls - eliminate, substitute, engineer, administrate, then PPE - and document the permit before the task.