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).”

  • Clear Results

TSSA Registered Certificate Of Authorization

  • MARMON INDUSTRIAL WATER LIMITED

    CSA-B51 Fittings, Process Piping Installation ASME B31.3 (SHOP ONLY), Power Piping Installation ASME B31.1 (SHOP ONLY)

  • MARSIL MECHANICAL INC

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

  • MASEN MECHANICAL INC.

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

  • MATCOM INDUSTRIAL INSTALLATIONS INC.

    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)

  • MATRIX NORTH AMERICAN CONSTRUCTION LTD

    Process Piping Installation ASME B31.3 (FIELD ONLY), ASME PP-3-Section I Boiler External Piping (FIELD ONLY), Refrigeration Piping Installation ASME B31.5 (FIELD ONLY), ASME U-6-Sec. VIII, Div 1 Pressure Vessel Mfr. (FIELD ONLY), ASME A-1-Section I Boiler Assembly (FIELD ONLY), ASME H-6-Section IV Boiler Manufacture (FIELD ONLY), Power Piping Installation ASME B31.1 (FIELD ONLY), Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)

  • MATTINA MECHANICAL LTD

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

  • MAXIM MECHANICAL GROUP INC.

    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)

  • MAXXWEL & CO. INC.

    Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), CSA-B51 Fittings

  • MCABEE CONSTRUCTION, INC.

    ASME PP-1-Section I Boiler External Piping (SHOP ONLY), Power Piping Installation ASME B31.1 (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP ONLY)

  • MCFLUSION CORP

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), CSA-B51 Fittings

  • MCLEOD BROS. MECHANICAL INC.

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

  • MCNOLTY MECHANICAL INC

    CSA-B51 Fittings, 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), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), ASME PP-2-Section I Boiler External Piping (SHOP & FIELD)

  • MDA FILTRATION A DIV. OF JOHN BROOKS COMPANY LIMITED

    CSA-B51 Fittings, Power Piping Installation ASME B31.1 (SHOP & FIELD), ASME UM-1-Sec. VIII, Div 1 Miniature Pressure Vessels (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY), ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY)

  • MDF MECHANICAL 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)