Red Seal Gasfitter Class A study plan

Map every common gas piping material (black steel, CSST, copper, PE, PVC for sleeves only) to its permitted use, joining method and prohibited application, and write a one-page comparison table from memory

Demonstrate and self-check the full sequence for threaded steel assembly: cutting square, reaming, thread count and engagement, approved sealant application leaving the first two threads bare, and torque/tightening limits

List brazing and welding acceptance criteria for fuel gas piping - filler alloy selection, purge requirements, joint visual defects - and identify which defects require cut-out versus repair

Identify the markings, pressure ratings and temperature limits stamped on valves, fittings and regulators, and explain what each marking means for the installed system

Assemble a personal tool and material checklist for a residential gas rough-in, noting which items are code-mandated versus convenience

Trace gas pressure through a complete system - service regulator, meter, house line, appliance regulator - and calculate the allowable pressure drop for each segment using the longest-run method

Size a natural gas and a propane branch line by the longest-length method for a given load schedule, and verify the result against the pipe sizing tables rather than rule of thumb

Explain the function, failure modes and correct installation orientation of service regulators, appliance regulators, line pressure regulators, relief valves and vent limiters

Describe the operation of manual shutoff valves, plug valves, ball valves, excess flow valves and solenoid valves, and state where each is required or prohibited

Diagnose three regulator fault scenarios (creep, lockup too high, droop under load) and write the test procedure that isolates each cause

Classify venting systems (Category I through IV, direct vent, power vent, B-vent, L-vent, single-wall) and match each appliance type to its permitted vent system and material

Calculate combustion air requirements using both the indoor air method and the outdoor air method, including the free area correction for louvers and grilles

Determine vent connector size, rise, lateral run, and termination clearances for a given appliance input and vent configuration, and identify the three most common venting installation errors

Explain spillage, draft hood operation, and the causes of downdraft and backdraft, including the role of depressurization from exhaust fans

Outline the installation and service sequence for a forced-air furnace and a power-vented water heater: clearances, condensate handling, gas supply connection, and startup checks

Locate and cite the governing clauses for ten common field situations across the gas installation code, the gas appliance code and the applicable provincial/territorial regulation, recording code section numbers and a one-line summary for each

Describe the permit, inspection and notification process for a gas installation from rough-in to final, including who may perform each step and what documentation must be posted or retained

Apply confined space entry, lockout/tagout and hot work permit requirements to a gas piping repair scenario, and list the required atmospheric tests and controls

Identify the personal protective equipment, ventilation and gas detection requirements for purging, leak testing and appliance servicing, including CO exposure limits and symptoms

Explain the documentation a gasfitter must produce and retain - pressure test records, startup reports, commissioning sheets, and manufacturer instructions as part of the certified installation

Size and specify gas supply for commercial loads: multiple appliances, diversity factors, meter and service regulator capacity, and overpressure protection for downstream equipment

Describe the design and safety features of commercial/industrial burners, including burner management, flame supervision, combustion air proving, and high/low gas pressure switches

Explain the layout and function of a commercial boiler or rooftop unit gas train: main shutoff, strainer, regulator, safety shutoff valves, test ports and leak test cocks

Calculate manifold pressure, orifice sizing and input derating for altitude and for propane conversion, and verify a burner is operating at rated input using clocking or a meter

Identify the requirements for gas detection, emergency shutoff, and ventilation interlock in a commercial boiler room or mechanical room

Read and interpret a ladder diagram for a gas-fired appliance control circuit, tracing the call for heat from thermostat through ignition control, safety switches and gas valve

Test and interpret readings for thermocouples, thermopiles, flame rectification sensors, igniters, gas valve operators and pressure switches, and distinguish a sensor fault from a control board fault

Explain the sequence of operation for standing pilot, intermittent pilot, hot surface ignition and direct spark systems, and identify where each sequence can fail

Perform a complete commissioning and combustion analysis: draft, CO, CO2, O2, excess air, temperature rise, and clocked input, and determine whether the appliance is within manufacturer tolerances

Build a structured troubleshooting method for no-heat, short-cycling, delayed ignition and rollout, listing the tests in the order they should be performed

Calculate load weight, center of gravity and sling tension for a multi-point lift, and select slings, shackles and hardware with the correct working load limit and safety factor

Plan a lift: identify the rigging points, inspect and reject defective rigging hardware, establish the exclusion zone, and state the hand signals and communication protocol

Prepare a site for a gas appliance or piping installation: verify structural support, clearances, access, and protection of piping from physical damage and corrosion

Describe the storage, handling and inspection requirements for pipe, fittings and appliances, and identify the damage that mandates rejection of CSST, coated pipe or regulators

Explain the requirements for supports, hangers, sleeves, and penetration of walls and floors for gas piping, including seismic and settlement considerations

Complete a timed full-length practice examination and score each domain separately to identify remaining weak areas

Re-study the three lowest-scoring domains using the reference sheets and code citation log built in earlier weeks, and rewrite each weak concept from memory

Perform a mock pressure test and leak test on a small assembly: select the test medium and pressure, hold duration, gauge range, and document the result

Walk through three appliance service scenarios end to end - diagnosis, repair, verification of operation, and documentation - within a set time limit

Review safety and code-edge cases: prohibited locations, clearance reductions, unlisted appliance installation, and when a permit or engineered design is required