The Technical Standards and Safety Authority (TSSA) adopts standards and administers the policies, procedures and processes for the certification of welders and brazers regulated under the Technical Standards and Safety Act, 2000’s Ontario Regulation 220/01: Boilers and Pressure Vessels (BPVs). Businesses that repair/alter BPVs and install/repair associated piping systems are required to hold a Certificate of Authorization (COA) from TSSA or another Canadian jurisdiction. Companies with a National Board Certificate of Authorization (“R” stamp) are also acceptable for repairs/alterations of BPVs.
“In the following directory, you can find a listing of businesses that hold a COA issued by TSSA. Please note that the information in this directory is updated periodically and may not reflect the most recent information available for each entry. If you have a question or concern regarding any of the information contained on this page, please contact customerservices@tssa.org or call 1-877-682-TSSA (8772).”

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TSSA Registered Certificate Of Authorization

  • AIR LIQUIDE GLOBAL E&C SOLUTIONS YANTAI CO., LTD.

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • AIR PRODUCTS & CHEMICALS (SHANGHAI) SYSTEMSCO., LTD

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • AIR PRODUCTS CANADA LTD

    Process Piping Installation ASME B31.3 (FIELD ONLY)

  • AIR SOLUTIONS CANADA INC.

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • AIRCOM HEATING & COOLING SYSTEMS LTD.

    Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD)

  • AIRMAX COMPRESSOR SERVICES LTD

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • AIRON HVAC AND CONTROL LTD.

    Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD)

  • AIRWAVE HEATING AND COOLING INC.

    Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD)

  • AIRWAY SYSTEMS LTD

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • ALBERICI CONSTRUCTORS LTD

    Power Piping Installation ASME B31.1 (FIELD ONLY), Process Piping Installation ASME B31.3 (FIELD ONLY), Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY), Medical Gas Piping Installation CSA-Z7396.1 (FIELD ONLY), Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • ALEX MAGEE & SONS LTD

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD)

  • ALEX MCCOY PLUMBING & HEATING LTD

    Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD)

  • ALFA MECHANICAL INC

    Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD)

  • ALGOMA PIPE FABRICATION INC

    Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • ALGOMA STEEL INC

    Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY), Power Piping Installation ASME B31.1 (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP ONLY), Owner/User Self Inspection of Repairs, Hot Tapping and Line Stopping (SHOP & FIELD)

  • ALL PRO SYSTEMS LTD.

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • ALLEGHENY BRADFORD CORP

    Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • ALLEN MECHANICAL INC

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • ALLIANCE ENGINEERING AND CONSTRUCTION LTD

    Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • ALLIANCE FABRICATING LTD

    ASME S-1-Section I Boiler Manufacture (SHOP ONLY), ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY), ASME U2-1-Sec. VIII, Div 2 Pressure Vessel Mfr. (SHOP ONLY), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)