Occupational Safety and Hazard Control

Professional Safety and Risk Control

Chapter Introduction

This chapter covers all the safety and risk control requirements that every journeyperson pipefitter must master for the Red Seal exam. Safety is not optional: it is governed by national standards, federal regulations, and engineering principles that you must know by heart. Approximately 12 to 15% of exam questions cover this topic. You must not only know the rules, but also understand why they exist and how to apply them in real-world job site situations.

Safety Legislation and Responsibilities

The Canada Occupational Health and Safety Regulations (COHSR)

The COHSR (Canada Labour Code, Part II) applies to workplaces under federal jurisdiction. It defines the rights and obligations of employers, supervisors, and employees. Key elements for the exam:

The Workplace Hazardous Materials Information System (WHMIS) is also a central element. You must know the three elements of WHMIS:

CSA Standards and the Canadian Electrical Code

As a pipefitter, you often work near electrical installations. The Canadian Electrical Code, Part I (CE Code) (C22.1) defines the minimum distances to maintain between workers and energized power lines. Key values to memorize:

> Exam tip: these distances are often presented in scenario-based questions. Remember the progression: 1 m, 3 m, 4.5 m, 6 m.

Personal Protective Equipment (PPE)

Head, Eye, and Respiratory Protection

The safety helmet must comply with CSA Z94.1. It must be worn at all times on a job site, even without any apparent risk of falling objects. Check the manufacturing date: polyethylene helmets have a recommended service life of 5 years.

Eye protection (CSA Z94.3) is mandatory during any cutting, grinding, welding, or chemical handling operation. Safety glasses must bear the CSA certification mark. For welding, use a face shield with the appropriate shade:

Respiratory protection (CSA Z94.4) depends on the contaminant and its concentration. The main types:

Hearing Protection and Gloves

Noise exposure must not exceed 85 dBA for an 8-hour day. Beyond that, hearing protection is mandatory. CSA Z94.2 governs hearing protectors. Ear plugs have a typical noise reduction rating (NRR) of 25 to 33 dB. Earmuffs offer an NRR of 20 to 30 dB.

Protective gloves must be selected according to the task:

> Common trap: welding gloves must never be used for handling chemicals, and vice versa. The exam often tests selecting the right PPE for a given task.

Confined Spaces

Definition and Classification

A confined space is a space that:

Typical examples in piping: tanks, vessels, large-diameter pipes, pits, silos.

CSA Z1006 (Management of Work in Confined Spaces) is the national reference standard. The three categories of confined spaces:

Entry Procedures

The mandatory sequence before any entry:

> Important calculation: normal oxygen concentration is 20.9%. An atmosphere is considered oxygen-deficient below 19.5% and oxygen-enriched above 23.5%. Both situations are dangerous.

Lockout and Control of Hazardous Energy

Lockout Principles

Lockout/tagout is governed by CSA Z460. It applies to all energy sources: electrical, hydraulic, pneumatic, thermal, chemical, gravitational, mechanical (springs, moving masses).

The five mandatory steps:

Each worker applies their own lock. Removing a lock that does not belong to you is prohibited, except in an emergency and according to a specific written procedure.

The Five Types of Hazardous Energy

> Exam trap: a hydraulic accumulator can store energy even after the pump is stopped. It must be depressurized or mechanically blocked before any intervention.

Work at Heights and Scaffolding

Falls: The Leading Cause of Death in Construction

Falls account for approximately 30% of deaths on construction sites in Canada. CSA Z259 governs fall protection systems.

The three methods of fall protection, in order of preference:

Components of a Fall Protection System

The maximum free fall distance is 1.8 m with an energy absorber. Calculation of total fall distance:

Total distance = lanyard length + absorber deployment (1.2 m) + worker height (1.8 m) + safety factor (0.9 m)

Example with a 1.8 m lanyard:

1.8 + 1.2 + 1.8 + 0.9 = 5.7 m minimum clearance below the anchor point.

Scaffolding

Scaffolds must be erected according to manufacturer specifications and the requirements of CSA S269.2. Essential points:

WHMIS and Hazardous Materials Management

WHMIS 2015 Hazard Classes

WHMIS 2015 is aligned with the Globally Harmonized System (GHS). Key pictograms to recognize:

The Safety Data Sheet (SDS)

The SDS contains 16 mandatory sections. The most important for the pipefitter:

> Exam tip: the SDS must be available at the workplace, in English and French, and accessible to all workers. It must be consulted before handling any hazardous product.

Fire Safety and Explosion Prevention

The Fire Triangle and Fire Classes

The fire triangle consists of three elements: fuel, oxidizer (oxygen), and ignition source. Extinguishing a fire involves removing at least one of these elements.

Fire classes and appropriate extinguishers:

Extinguisher rule: aim at the base of the flames, sweep from left to right, at a distance of 1.5 to 2 m.

Explosion Prevention During Welding and Cutting

Welding and cutting produce sparks and heat that can ignite flammable vapours. Mandatory precautions:

Material Handling and Rigging

Manual Handling Principles

The basic rule: never lift more than 23 kg without mechanical aid or assistance. Safe lifting techniques:

Slings and Lifting Equipment

Slings must be inspected before each use. Rejection criteria:

The rated capacity of a sling decreases with the angle. For a two-leg sling:

> Calculation: if a sling has a capacity of 2,000 kg at 90°, its capacity at 45° is 2,000 × 0.71 = 1,420 kg. Never exceed 60° at the top.

Hazards Specific to the Pipefitting Trade

Welding: Fumes and Radiation

Welding fumes contain metal oxides (iron, manganese, chromium, nickel) and gases (ozone, nitrogen oxides). Ventilation is mandatory:

Arc radiation emits ultraviolet (UV) and infrared (IR) rays. The face shield must protect the face and neck. Clothing must be flame-resistant cotton or leather, never synthetic fibres that melt and burn the skin.

Asbestos and Crystalline Silica

Asbestos is found in old pipe insulation, gaskets, and lagging. Any work on suspect materials must be stopped and reported. Only trained and equipped workers may handle asbestos.

Crystalline silica is released when cutting concrete, brick, or mortar. The occupational exposure limit is 0.025 mg/m³ over 8 hours. Use a vacuum with a HEPA filter and a mask with a P100 cartridge.

First Aid and Emergency Response

Emergency Plan

Every job site must have a written emergency plan including:

Common Emergency Situations

Summary

Pitfalls to Avoid

Practice Questions

This chapter covers all the essential safety knowledge for the Red Seal exam. Review the numerical values, CSA standards, and step-by-step procedures. Safety is a domain where precision makes the difference between a correct answer and a disqualifying error.