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

  • MORROW ENERGY, LLC

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • MP WELDING & FABRICATION

    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)

  • MULTITECH TRADES CORP.

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

  • MULTI-TEMP SYSTEMS INC.

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

  • MULTIWIDE MECHANICAL CONTRACTOR LIMITED

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

  • MUSKOKA MILLWRIGHTING & MACHINING 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)

  • MUTUAL MECHANICAL LIMITED

    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)

  • MWS SOLUTIONS INC.

    Alternate Piping Process, Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), ASME PP-2-Section I Boiler External Piping (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), ASME A-1-Section I Boiler Assembly (FIELD ONLY)

  • N.J. MCCUTCHEN, INC.

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • NACHURS ALPINE SOLUTIONS INC

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

  • NATIONAL MECHANICAL INC

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

  • NAYLOR BUILDING PARTNERSHIPS INC

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

  • NCA LTD

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

  • NCF MOBILE WELDING LTD.

    Power Piping Installation ASME B31.1 (FIELD ONLY), Process Piping Installation ASME B31.3 (FIELD ONLY), Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)

  • NEELANDS GROUP LIMITED

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

  • NEKISON ENGINEERING & CONTRACTORS LTD

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

  • NELCO MECHANICAL 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)

  • NELSON WELDING LIMITED

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