Every certificate number on this page is listed publicly by the Technical Standards and Safety Authority and can be verified independently.
International Mobile Welding Ltd. holds seven TSSA authorizations: six Certificates of Authorization covering ASME B31.1 power piping, ASME B31.3 process piping, ASME B31.5 refrigeration piping, boiler and pressure vessel repair and alteration, hot tapping and line stopping, and the Alternate Piping Process — plus a TSSA Fuels Contractor Registration. All are registered to 5635 King Rd. RR 3, Nobleton, Ontario L0G 1N0.
| Certificate # | Certificate Type | Scope | Expires |
|---|---|---|---|
| QA-01697 | Power Piping Installation, ASME B31.1 | Shop & field | 21 December 2026 |
| QA-01698 | Process Piping Installation, ASME B31.3 | Shop & field | 21 December 2026 |
| QA-03667 | Refrigeration Piping Installation, ASME B31.5 | Shop & field | 21 December 2026 |
| QA-01699 | Boilers & Pressure Vessels Repair / Alteration | Field only | 21 December 2026 |
| QA-03336 | Hot Tapping and Line Stopping | Shop & field | 21 December 2026 |
| QA-10894 | Alternate Piping Process (ALT) | Alternate Process for Pressure Piping Inspection in Ontario | 21 December 2026 |
Verify these on the TSSA register: Find a Certificate of Authorization Holder — International Mobile Welding Ltd. Registered to 5635 King Rd. RR 3, Nobleton, Ontario L0G 1N0.
| Authorization # | Registration Type | Status | Expires |
|---|---|---|---|
| FS R0076614627 | Fuels Contractor Registration | Active | 30 November 2026 |
Effective 1 December 2025. Registered fuels contractors are the only businesses legally authorized to carry out fuels work in Ontario. Verify on the TSSA register: TSSA registered fuels contractors — International Mobile Welding Ltd.
Plain-language explanation of the scope each certificate carries.
B31.1 governs piping in power generating stations, industrial plants and central and district heating systems: boiler external piping, high-pressure steam and hot water, and the connections around them. Holding it shop and field means we can both fabricate B31.1 piping in Nobleton and install or modify it in your plant. Power piping →
B31.3 governs piping that carries process fluids in industrial and processing facilities — chemicals, process and chilled water, compressed gases and in-plant steam distribution. Most plant utility and distribution work in Ontario falls under this code. Process piping →
B31.5 governs refrigerant and secondary coolant piping. It applies to chillers, process cooling and refrigeration systems in food, beverage and cold storage facilities.
A field authorization for repairing and altering registered boilers and pressure vessels. Repairs to a registered vessel must be carried out under a valid Certificate of Authorization — an unauthorized repair can invalidate the vessel's registration.
Covers making connections into, and temporarily isolating, piping systems that remain pressurized and in service. This is a separate authorization from general pressure piping installation. Hot tapping → Line stopping →
The ALT programme allows qualifying pressure piping installations to proceed under our own TSSA-accepted quality program rather than routing every joint through individual field inspection. On qualifying work that removes an inspection scheduling dependency from the critical path. Not every installation qualifies — we confirm the applicable route before work starts.
All seven authorizations are on public TSSA registers. The six Certificates of Authorization are listed on the certificate holder register against this address, with the same numbers, scopes and expiry dates shown above. The Fuels Contractor Registration is on the separate registered fuels contractor register. You do not have to take our word for any of it.
If a contractor cannot produce the certificate number for the code your project falls under, that is worth knowing before the work starts, not after.
Yes. IMW holds six TSSA Certificates of Authorization and a TSSA Fuels Contractor Registration, listed with certificate numbers above. All are registered to 5635 King Rd., Nobleton, Ontario.
It is the authorization a contractor must hold in Ontario to construct, install, repair or alter regulated pressure equipment under a given code. It is issued to a company for a defined scope — for example shop and field, or field only — and is tied to a TSSA-accepted quality control program, qualified welding procedures and qualified welders.
B31.1 is the power piping code — boiler external piping, high-pressure steam and hot water, power and district energy plants. B31.3 is the process piping code — the fluids a plant processes or distributes internally. Allowable stresses, design margins, examination requirements and documentation all differ. A single facility often contains both, which is why IMW holds both authorizations rather than sub-contracting one of them.
No. IMW is not currently a qualified nuclear supplier and holds no CSA N285 or N299 registration. Ownership has prior CSA N285 nuclear pressure boundary experience from earlier in their career, and nuclear supply chain qualification is a longer-term objective.
Ask and we will send a copy of any authorization before you award the work.
