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Steamfitter / Pipefitter (307A) Red Seal Exam in Ontario

Certifying authority: Skilled Trades Ontario (STO). Last checked 2026-09-10.

Certification is required in Ontario

This trade is on Ontario’s compulsory list as Steamfitter (307A). Under Skilled Trades Ontario, workers must hold a valid Certificate of Qualification, a Provisional Certificate of Qualification, or a Registered Training Agreement; journeypersons must renew their C of Q each year. Official list PDF is dated Feb 2022; the count of 23 still matches the current STO page.

Source: Skilled Trades Ontario — Compulsory Trades (23 trades)

Preparing for the Steamfitter / Pipefitter (307A) exam in Ontario?

Start with 10 free interactive Steamfitter / Pipefitter (307A) questions with worked explanations, or take a full 130-question timed mock exam weighted to the official RSOS breakdown.

Try the 10-Question Interactive Steamfitter / Pipefitter (307A) Quiz & Free PDF → Take Full 130-Question Timed Mock Exam ($14.99 CAD) →

Or unlock all Steamfitter / Pipefitter (307A) questions with the 7-Day Pass ($9.99) or 3-Month Pass ($69.99, Free-Until-You-Pass Guarantee).

Whether it is required or not, the exam itself is the same paper everywhere in Canada. What your province decides is whether you must hold the certificate, how you apply, and where you sit it.

The exam: 130 questions, 7 Major Work Activities

The Red Seal Occupational Standard sets the split below. It does not change by province.

Major Work ActivityWeightingQuestions
MWA A: Performs common occupational skills 12% 16 Qs
MWA B: Performs layout, fabrication and piping installation 22% 29 Qs
MWA C: Performs rigging, hoisting, lifting and positioning 12% 15 Qs
MWA D: Installs, tests, maintains, troubleshoots and repairs low and high pressure steam and condensate systems 18% 24 Qs
MWA E: Installs, tests, maintains, troubleshoots and repairs heating, cooling and process piping systems 21% 27 Qs
MWA F: Installs, tests, maintains, troubleshoots and repairs renewable energy systems 6% 8 Qs
MWA G: Performs commissioning, start-up and turnover 8% 11 Qs

Source: Red Seal Exam Breakdown — Steamfitter / Pipefitter (307A), red-seal.ca

Time allowed and pass mark

4 hours, and a 70% pass mark (91/130). These are set provincially rather than by the Red Seal standard, and the four hours is the same whether your paper is 100 or 150 questions.

Confirmed against Skilled Trades Ontario’s Exam Preparation Guide and SkilledTradesBC. Check your own authority before exam day.

Quick 3-Question Steamfitter / Pipefitter (307A) Readiness Check

Click any option (A–D) below to grade yourself immediately and view the worked explanation:

Sample Question 1 of 3
A steamfitter crew at a pulp mill in Prince George must enter a black liquor storage tank to replace a corroded internal steam coil. The entry permit requires an atmospheric test with a four-gas meter before anyone goes in, and the apprentice holding the meter asks the journeyperson how the readings are taken and judged. In what order is the test done?
A) Zero the meter in fresh air outside; read the oxygen level; read the flammable gas (LEL); then read the toxic gases (H2S, CO)
B) Zero the meter in fresh air outside; read the flammable gas (LEL); read the oxygen level; then read the toxic gases (H2S, CO)
C) Zero the meter in fresh air outside; read the toxic gases (H2S, CO); read the oxygen level; then read the flammable gas (LEL)
D) Read the oxygen level; read the flammable gas (LEL); read the toxic gases (H2S, CO); then zero the meter in fresh air outside
Correct answer: A

The meter is zeroed in clean air, not inside the tank. Oxygen is read first because many flammable-gas sensors need enough oxygen to read correctly; flammable gas and then toxic gases follow, each judged against the permit limits. The other options use the same steps in the wrong order: B does 'read the flammable gas (LEL)' before 'read the oxygen level', C does 'read the toxic gases (H2S, CO)' before 'read the oxygen level', and D does 'read the toxic gases (H2S, CO)' before 'zero the meter in fresh air outside'.

Sample Question 2 of 3
A safety audit at a shop in Saskatoon finds no written schedule for inspecting rigging gear, and some tag lines and slings have been tied with knots that nobody has checked. One rope has a hitch that has been left in it for weeks. What should the crew do?
A) Leave the written schedule off, since it is enough to give the gear a look when it is taken out
B) Write up the regular inspection schedule, check each knot and hitch, and retie or replace them
C) Leave the knots in the rope, since a knot that has held for weeks has already proved that it holds
D) Pull the knots tighter with a small come-along, so that they can be left as they are on the rope
Correct answer: B

Regular inspection requirements are documented, and knots and hitches are inspected and retied. An old knot may have weakened the rope, and more tension does not repair it.

Sample Question 3 of 3
A journeyperson steamfitter at a refinery in Montreal is preparing a newly installed process piping system for its hydrostatic test. The line has relief valves set well below the test pressure, long spans sized only for gas, and several high points. In what order should the system be prepared and tested?
A) Raise pressure on calibrated gauges; remove or blank the relief valves; fit temporary supports for the water; then fill it with the vents open
B) Remove or blank the relief valves; fill it with the vents open; fit temporary supports for the water; then raise pressure on calibrated gauges
C) Remove or blank the relief valves; fit temporary supports for the water; fill it with the vents open; then raise pressure on calibrated gauges
D) Remove or blank the relief valves; fit temporary supports for the water; raise pressure on calibrated gauges; then fill it with the vents open
Correct answer: C

Relief valves set below the test pressure are removed, blanked or gagged, and a temporary test relief is used. Temporary supports carry the water weight, vents clear the air while filling, and the pressure is raised on calibrated gauges. The other options use the same steps in the wrong order: A does 'raise pressure on calibrated gauges' before 'remove or blank the relief valves', B does 'fill it with the vents open' before 'fit temporary supports for the water', and D does 'raise pressure on calibrated gauges' before 'fill it with the vents open'.

Where you write it in Ontario

Booking is handled by Skilled Trades Ontario (STO); confirm current locations and dates with them.

Preparing for the Steamfitter / Pipefitter (307A) exam

Our Steamfitter / Pipefitter (307A) question bank is built to the official RSOS weighting above, with a worked explanation and code citation on every question.

Continue to Full 10-Question Interactive Steamfitter / Pipefitter (307A) Quiz → Take the full 130-question timed mock exam →

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