Trade Safety, Rigging, and Workplace Practices

Trade Safety, Rigging, and Work Practices

Chapter Introduction

This first chapter establishes the non-negotiable foundations of the gasfitter trade, Class B. Before you calculate piping or size a vent, you must master the safety rules that protect your life, your colleagues' lives, and the public. The Red Seal exam places significant weight on this competency block (approximately 8 to 10% of the questions). Questions focus less on abstract theory and more on concrete job-site situations: which personal protective equipment for which task, how to secure a load, what procedure to follow in the event of a gas leak, and so on.

This chapter covers four areas: legal responsibilities and Canadian standards, personal protective equipment (PPE), lifting and material handling practices, and emergency and safety procedures in the workplace.

Legal Responsibilities and Canadian Standards

The Standards System in Canada

In Canada, safety in the gas sector is governed by a multi-level system. At the federal level, the Canada Labour Code (for workplaces under federal jurisdiction) and the Canada Occupational Health and Safety Regulations establish the basic principles. At the provincial/territorial level, each jurisdiction has its own occupational health and safety act (for example, the Occupational Health and Safety Act in Ontario, the Workers Compensation Act in British Columbia). The Red Seal exam requires you to know the general principles common to all these laws, not the provincial details.

The fundamental principle is the right to refuse dangerous work. Any worker who has reasonable grounds to believe that a task presents an imminent danger to their health or safety (or that of others) must refuse to perform it. The standard procedure is as follows:

Exam trap: You will often be asked who has the primary responsibility for safety. The correct answer is: all workers, not just the employer. The employer has the responsibility to provide a safe environment and training, but every worker has the duty to work safely and report hazards.

The Canadian Electrical Code and Gas

For the gasfitter, the most important standard is CSA B149.1 — Natural Gas and Propane Installation Code. This code is adopted (with or without modifications) by all provinces and territories. It applies to the installation, extension, alteration, and maintenance of gas installations. CSA B149.2 covers propane appliances (for example, propane tanks, mobile cylinders, and filling stations).

Although this chapter is devoted to safety rather than installation, you must know certain rules from B149.1 that directly affect safety:

The Canadian Electrical Code, Part I (CE Code) (C22.1) applies to electrical installations, but the gasfitter must know the grounding and bonding rules for gas piping. Rule 10-200 requires that metallic gas piping be bonded to the building ground to prevent sparks in the event of an electrical fault. Never confuse this: the gasfitter does NOT make the electrical connection themselves, but they must ensure the gas pipe is accessible for bonding.

WHMIS (Workplace Hazardous Materials Information System)

WHMIS is a national system that classifies hazardous products and requires their identification. The gasfitter encounters products such as leak detector solution (often soap-based), pipe joint compounds (thread sealant), cleaning solvents, and the gases themselves (natural gas, propane).

Each hazardous product must have:

The WHMIS pictograms (updated in 2015 to align with the GHS — Globally Harmonized System) number 10 in total. For the gasfitter, the most relevant ones are:

Exam trap: You will often be asked what a specific pictogram means. Memorize all 10 pictograms and their categories. Natural gas itself does NOT have a WHMIS pictogram because it is distributed by pipeline and not sold as a product in a container — but propane in cylinders does have the "gas cylinder" and "flame" pictograms.

Personal Protective Equipment (PPE)

Head, Eye, and Face Protection

The safety hard hat (Class E, G, or C according to CSA Z94.1) is mandatory on most job sites. Class E (electrical) protects against electrical shock up to 20,000 V; Class G (general) up to 2,200 V; Class C (conductive) offers no electrical protection. For the gasfitter working near power lines, Class E is recommended.

Safety glasses (CSA Z94.3) must bear a certification mark. They protect against flying particles (metal filings, copper dust, metal fragments when cutting pipe). Face shields are required for grinding, welding, or cutting work. Note: safety glasses do NOT replace a face shield, and vice versa.

Respiratory Protection

This is the most critical area for the gasfitter. The atmosphere may contain natural gas (methane), propane, carbon monoxide (CO), or be oxygen-deficient.

Golden rule: If the detector indicates a combustible gas concentration above 10% of the LEL, the area is considered hazardous. You must stop work, ventilate, and identify the source of the leak. At 25% of the LEL, evacuate immediately.

Hand, Foot, and Body Protection

Lifting, Material Handling, and Rigging

Manual Lifting Principles

Back injuries are the leading cause of absenteeism among gasfitters. The basic rule: never lift more than 23 kg (50 lb) alone without mechanical assistance. For heavier loads, use a hand truck, forklift, or ask for help.

Correct lifting technique:

Exam trap: You will often be asked what the correct back position is during a lift. The answer: straight, in its natural alignment. Neither curved nor hyperextended.

Slings and Lifting Accessories

Rigging is a skill that the Class B gasfitter must master to lift water heaters, tanks, and heavy pipe sections.

Slings are classified into three categories:

Load factor: Each sling has a rated capacity (working load limit, WLL) indicated on a tag. This capacity decreases with the rigging angle. For a V-sling (two legs), the effective capacity is:

Calculation formula: For an angle θ between the sling leg and the vertical, the tension in each leg is:

T = (Weight of the load) ÷ (2 × cos θ)

Example: A 200 kg load suspended by two sling legs at a 45° angle from vertical. T = 200 ÷ (2 × 0.707) = 141 kg per leg. If the sling has a capacity of 150 kg, it is acceptable. But at 60°, T = 200 ÷ (2 × 0.5) = 200 kg per leg — the same sling would be overloaded.

Exam trap: The larger the angle between the legs (i.e., the further apart the slings are spread), the greater the tension in each leg. The maximum recommended angle is 90° between the two legs (45° on each side of vertical). Beyond that, the load becomes unstable.

Inspection of Lifting Equipment

Before each use, the gasfitter must inspect:

Any defective equipment must be removed from service immediately and tagged "OUT OF SERVICE." Never attempt to repair a synthetic sling or wire rope — replace it.

Crane Hand Signals

The gasfitter may be required to guide a crane operator. The standard hand signals (ASME B30.5) are:

Golden rule: Only one signal person at a time. The signal person must be visible to the operator. When in doubt, the operator must stop.

Fire Safety and Hazardous Atmospheres

Properties of Natural Gas and Propane

Natural gas (methane, CH₄) and propane (C₃H₈) are both flammable, but their properties differ:

Practical consequence: Natural gas rises and dissipates upward; propane accumulates at floor level. When searching for a propane leak, you must check basements, sumps, and low points first. For natural gas, check ceilings, drop ceilings, and attics.

Exam trap: You will often be asked why mercaptan (rotten egg odour) is added to gas. Answer: to detect leaks by smell. Natural gas and propane are odourless in their pure state.

Gas Leak Procedure

The standard procedure (CSA B149.1, Rule 3.2) is:

NEVER use an open flame (lighter, match) to detect a leak. Use an electronic detector or a soapy solution (water + soap) applied to joints — bubbles indicate the leak.

Fire Extinguishers

The gasfitter must know the classes of fire extinguishers:

For a gas fire (Class B), the ABC extinguisher (multipurpose powder) is the most common. The technique for use is P.A.S.S.:

Critical rule: NEVER attempt to extinguish a gas fire if the gas supply has not been shut off. You risk creating an accumulation of gas that will explode. Shut off the gas first, then extinguish the fire.

Confined Spaces and Working at Heights

Confined Spaces

A confined space is a space that:

Examples for the gasfitter: a crawl space under a house, an empty propane tank, a deep trench, a basement.

The confined space entry procedure (according to CSA Z1006 standards and provincial regulations):

Exam trap: The acceptable oxygen concentration is between 19.5% and 23.5%. Below 19.5%, it is an immediate danger (hypoxia). Above 23.5%, there is an increased fire risk.

Working at Heights

The gasfitter often installs piping at heights (ceilings, roofs). The basic rules:

Golden rule: Never carry tools in your pockets when climbing a ladder. Use a tool belt or a hoisting rope.

Summary

Traps to Avoid

This chapter covers the foundations of safety. In the following chapters, we will cover gas properties, piping calculations, appliances, and venting systems. Mastery of this chapter is an absolute prerequisite — the Red Seal exam will test these concepts in an integrated manner within situational questions.