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

  • KIRBY JOSEPH HEFFERNAN O/A HEFFYS WELDING SERVICES

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

  • KNK MECHANICAL GROUP

    ASME PP-2-Section I Boiler External Piping (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD)

  • KOBELCO COMPRESSORS AMERICA INC

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

  • KORE MECHANICAL INC.

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

  • KQM MANUFACTURING INC.

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

  • KUBOTA MATERIALS CANADA CORPORATION

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

  • KUHL MACHINE SHOP LTD.

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

  • L.J. BARTON 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), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD)

  • L.Z. REFRIGERATION INC

    Refrigeration Piping Installation ASME B31.5 (SHOP ONLY), Medical Gas Piping Installation CSA-Z7396.1 (FIELD ONLY)

  • LAFRAMBOISE GROUP INC

    ASME U-4-Sec. VIII, Div 1 Pressure Vessel Mfr. (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • LAFRAMBOISE GROUP LTD

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

  • LAKELAND MULTI-TRADE INC.

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

  • LAKESIDE PROCESS CONTROLS LTD.

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

  • LAMSAR INC

    ASME A-2-Section I Boiler Assembly (SHOP & FIELD), ASME U-4-Sec. VIII, Div 1 Pressure Vessel Mfr. (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Hot Tapping and Line Stopping, Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • LANCASTER GROUP INC

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

  • LANGENDOEN MECHANICAL INC.

    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)