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

  • JSM CONTROLS INC.

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

  • JV ENERGY SOLUTIONS INC.

    ASME PP-2-Section I Boiler External Piping (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)

  • K L Q MECHANICAL LTD.

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

  • KAESER COMPRESSORS

    Process Piping Installation ASME B31.3 (FIELD ONLY)

  • KC MECHANICAL INC.

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

  • KEITH'S PLUMBING & HEATING INC.

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

  • KEL-GOR LIMITED

    ASME S-2-Section I Boiler Manufacture (SHOP & FIELD), ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY), ASME U2-3-Sec. VIII, Div 2 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)

  • KELSON MECHANICAL EASTERN 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)

  • KELSON 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)

  • KELSON SERVICE INC

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

  • KEM KHIDER ELECTROMECHANICAL INC

    Power Piping Installation ASME B31.1 (FIELD ONLY)

  • KEN ROBINSON REFRIGERATION 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)

  • KENAIDAN CONTRACTING LTD

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

  • KENT COMPRESSOR INC

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

  • KGO GROUP LTD.

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • KHS GMBH

    Power Piping Installation ASME B31.1 (SHOP ONLY)

  • KHS USA, INC.

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

  • KINECTRICS INC.

    Vessels, Pumps, Valves, Piping & Containment (N with NA), Supports (NS) (Can be added to N/NPT/NA), CSA-N285.0 Nuclear Fittings (SHOP ONLY), CSA-N285.0 Nuclear Fitting Repair or Modification (SHOP ONLY), CSA-N285.0 Nuclear Fitting Repair or Modification (SHOP & FIELD), CSA-B51 Fittings

  • KING'S ENERGY SERVICES LTD

    Pressure Relief Valve Repair (SHOP ONLY)

  • KIPSTEEL LIMITED

    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)

  • 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)