Occupational Skills, Safety, and Rigging

Professional Skills, Safety, and Rigging

Introduction to the Trade and Regulatory Context

The trade of steamfitter-pipefitter involves installing, assembling, maintaining, and repairing pressurized piping systems, boilers, heat exchangers, and circuits for steam, thermal fluids, gas, and chemicals. The Red Seal exam assesses your ability to apply national standards and safety principles in a practical context.

Before any work, you must identify hazards, wear appropriate personal protective equipment (PPE), and comply with Canadian standards requirements. The three pillars of certification are: safety, measurement precision, and code compliance.

Health and Safety Legislation and Responsibilities

Occupational Health and Safety Act (OHSA) — General Principles

Although each province has its own legislation, the fundamental principle is the right to refuse dangerous work. You must know your three rights: the right to know (about hazards), the right to participate (in the health and safety committee), and the right to refuse (dangerous work).

WHMIS (Workplace Hazardous Materials Information System) requires that you know how to read a Safety Data Sheet (SDS). For the exam, remember the three key elements of an SDS: product identification, first aid measures, and firefighting measures. WHMIS 2015 pictograms (aligned with GHS) include the flame, exploding bomb, skull and crossbones, corrosion, gas cylinder, exclamation mark, environment, and health hazard.

Canada Labour Code (Federal Sector) and CSA Standards

You must know the following standards by their exact names:

For gas, Rule 6.14.1 of CSA B149.1 requires a vent pipe for every gas appliance. Rule 8.2.2 specifies minimum clearances for appliances. Remember that the test pressure for a natural gas system is 1.5 times the maximum operating pressure with a minimum of 3.5 kPa (0.5 psi) for at least 10 minutes.

Personal Protective Equipment (PPE)

Selection and Maintenance

Safety helmets must comply with CSA Z94.1. Safety glasses must meet CSA Z94.3. Safety footwear must bear the CSA Z195 mark with a puncture-resistant sole and steel or composite toe cap.

For welding, the face shield must have a minimum shade of shade 10 for arc welding. For oxyacetylene cutting, a shade of 5 is sufficient. Never confuse the two.

Respiratory Protection

Respirators must be individually fitted (fit testing). For silica dust (when grinding pipes), a half-mask with N95 filter is the minimum. For organic vapours (degreasers, solvents), use an activated carbon filter (Type A). The exam will often ask you to choose the correct filter based on the contaminant.

Lockout/Tagout and Control of Hazardous Energy

CSA Z460 Standard

Lockout/tagout is mandatory before any intervention on a pressurized, electrical, mechanical, or thermal system. The five steps are:

Exam Trap: A closed valve is not valid isolation. You must install a blind flange or plug if the valve could leak. The golden rule: a valve alone is never sufficient for work on a pressurized system.

Residual Pressure and Condensate

In steam systems, pressure may appear to be zero on the gauge, but pressurized condensate can remain trapped. Always open drains at the lowest point. A steam flash can cause severe burns. For the exam, remember that the temperature of saturated steam at 100 kPa (1 bar) is approximately 120 °C; at 700 kPa, it reaches 170 °C.

Fire Safety and Hot Work

Hot Work Permit

Any work generating sparks (welding, grinding, cutting) near a risk area requires a hot work permit. Conditions include:

Fire Extinguishers

Trap: Never use water on a Class B or C fire. For a metal fire (Class D), water causes an explosion.

Rigging and Load Handling

Terminology and Principles

A sling is the assembly of cable, chain, or webbing that connects the load to the crane hook. The rated load is the maximum load the sling can support in vertical lifting. The sling angle is the angle between the sling and the horizontal. The smaller this angle, the greater the tension in each leg.

Calculating Tension in a Sling

The tension (T) in each leg of a two-leg sling is:

T = (Load Weight) ÷ (2 × sin θ)

where θ is the angle between the sling and the horizontal.

Example: A 1000 kg load is lifted with two slings at a 45° angle. The tension per leg is:

T = 1000 ÷ (2 × sin 45°) = 1000 ÷ (2 × 0.707) = 1000 ÷ 1.414 = 707 kg

If the angle drops to 30°, the tension becomes:

T = 1000 ÷ (2 × 0.5) = 1000 kg

Golden Rule: The sling angle must never be less than 30°. Below 30°, the rated load of the sling must be drastically reduced. The load factor for a 30° angle is 1.0; for 45°, it is 0.707; for 60°, it is 0.577.

Load Factor Table (Multipliers)

Sling Inspection

Before each use, inspect:

Standard: Slings must comply with CSA Z150 (mobile crane safety) or ASME B30.9 (slings). The hook must have a functioning safety latch.

Tag Lines and Load Guidance

A tag line is a rope attached to the load to control it. It must be at least 1.5 times the lifting height in length. Never stand under a suspended load. The danger zone is defined as the radius of the lifting height + 2 m.

Hand and Power Tools

Wrenches and Torque Specifications

Bolting of flanges must follow a cross pattern or star pattern to prevent flange distortion. Torque is specified in N·m (newton-metres). For a 2-inch (50 mm) flange with 5/8-inch bolts, typical torque is 80 to 100 N·m.

Conversion formula: 1 lb-ft = 1.356 N·m. To convert N·m to lb-ft, divide by 1.356.

Grinders and Rotary Tools

The maximum peripheral speed of a grinding wheel is indicated on the label. Never exceed the maximum speed of the grinder. Safety rule: the wheel must rotate toward you (in the opposite direction from your body) so that sparks move away. Always wear a face shield in addition to safety glasses.

Fitting and Welding — Precautions

Joint Preparation

Before welding, pipe ends must be beveled at an angle of 37.5° ± 2.5° for a standard V-joint. The root gap must be 1.5 to 3 mm. The root weld is the first pass; it must have complete penetration to prevent cracking.

Shielding Gases and Ventilation

Arc welding produces fumes containing metal oxides. Local exhaust ventilation (source capture) is required. For stainless steel welding, hexavalent chromium fumes are carcinogenic — an air-supplied respirator is mandatory in confined spaces.

Confined Spaces

A confined space is a space that:

CSA Z1006 (confined space work management) requires an entry permit, atmospheric testing (O₂: 19.5 to 23.5%, LEL < 10%, H₂S < 10 ppm), and an attendant outside. The attendant must never enter to perform a rescue.

Piping Codes and Standards

CSA B51 and B149.1 — Key Points

CSA B51 covers boilers and pressure piping. It requires that pipes be marked with the specification number (e.g., ASTM A106 Gr B), pressure rating, and heat number. The hydrostatic test pressure is 1.5 times the design pressure (minimum).

CSA B149.1 (natural gas/propane) specifies:

Trap: Copper is not permitted for natural gas above 14 kPa (2 psi) in buildings. For propane, copper is prohibited inside residential buildings.

Pipe Identification (Marking)

Pipes must be identified with labels indicating the fluid, pressure, and direction of flow. Background colours according to CSA Z321 (piping system identification):

Commissioning and Testing Procedures

Hydrostatic Pressure Testing

Before commissioning a piping system:

Never use compressed air for a pressure test on a steam system — the stored energy is dangerous. Pneumatic testing is only permitted when a fluid cannot be used (e.g., cryogenic systems) and requires special precautions.

Purging and Flushing

Before commissioning, lines must be flushed with water or purged with steam to remove weld debris, mill scale, and foreign matter. A temporary Y-strainer must be installed upstream of sensitive equipment (control valves, pumps).

Summary

Traps to Avoid

This chapter covers all the professional skills, safety, and rigging competencies required for the Red Seal exam. Review the tables, memorize the standards by their full names, and practice rigging calculations until they become automatic.