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  • Writer's pictureAllan Bozek, P. Eng

Hazardous Locations for Operations and Maintenance Personnel

A six-hour course intended for Managers, Operations and Maintenance Personnel and Technical Support Personnel who require an understanding of hazardous locations. The course covers hazards posed by flammable gases/vapours in classified locations, hazardous area classification drawings, and OH&S regulations as they apply to HazLoc.


Course Description

Learning Objectives:

  • To understanding the hazards posed by flammable gases/vapours in classified locations

  • To read and understand a hazardous area classification drawing

  • To know the OH&S regulations as they apply to hazardous locations


Allan Bozek, P.Eng, MBA Allan has over 30 years experience in the design, construction, commissioning and maintenance of industrial power systems. The scope of his experience includes manufacturing, oil and gas production, refining, water treatment and mining industrial facilities. He is a member of the IEEE industrial applications society, a committee member of the Canadian Electrical Code Section 18 (Hazardous Locations) and is a registered Profession Engineer in Alberta, British Columbia, Saskatchewan and Ontario.

Detailed Outline

1. Defining the Hazard

  • The Fire Triangle

  • Probability of a release and an ignition event

  • Normal vs. Abnormal vs. Catastrophic release events

2. Properties of Flammable Materials a. Flashpoint


  • Auto-ignition

  • GHS and WHIMIS classification of flammable materials

3. Regulatory Requirements

  • Occupational Health and Safety Legislation

  • Canadian Electrical Code

4. Hazardous Area Classification - Overview

  • Purpose of a hazardous area classification

  • Terminology

    • Division vs. Zone

  • Design Process

    • Hazardous area classification standards and recommended practices

    • Documentation requirements

    • Use of ventilation, purging and vapour tight barriers as a basis for a hazardous area classification

    • Installation of non-hazardous rated equipment in hazardous locations

  • Interpreting a hazardous area classification drawing

  • Review of several area classification designs

    • Wellsite

    • compressor station

    • Large gas processing facility

5. Regulated Work Activities in Hazardous Locations

  • Work activities incorporating potential sources of ignition

  • Evaluation of potential ignition sources

  • Use of vehicles in hazardous locations

  • Hot Work permits

  • Gas watch procedures

    • Gas detector calibration requirements

  • Grounding and bonding in hazardous locations

  • Use of Portable electronics in hazardous locations

    • Certification requirements

    • Interpreting hazardous location markings on portable equipment

  • Tutorial – Evaluating portable equipment for use in a hazardous location

6. Operations and Maintenance in Hazardous Locations

  • Building ventilation systems

  • Tarpaulin enclosed areas

  • Storage of flammable materials

  • Laboratories handling flammable materials

  • Process secondary seals

  • Care and maintenance of explosion-proof equipment

7. Case Studies

  • Use of cheater cords for construction

  • Turnaround activities impacting the hazardous area classification

  • Ventilation system modification for winter months

  • Hot work on a storage tank

  • Vehicle operation in a hazardous location


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