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

  • ONTARIO POWER GENERATION INC.

    CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY), Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)

  • ONTARIO POWER GENERATION INC-NUCLEAR WASTE MANAGEMENT DIVISION

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

  • ONTARIO VALVE REPAIR SERVICE INC.

    Pressure Relief Valve Repair (SHOP ONLY)

  • ONYX MECHANICAL LTD

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

  • O'PHEE 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)

  • OPTIMAL AIR SOLUTIONS INC

    Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • OPTIMUM MECHANICAL SOLUTIONS INC

    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)

  • OPUS MECHANICAL SERVICES 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)

  • ORION HVAC/R SERVICES LTD.

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

  • OTTAWA COMPRESSOR SERVICES INC

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

  • OXFORD ENERGY SOLUTIONS INC.

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

  • OXFORD PLUMBING INC.

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

  • OXY VINYLS CANADA CO

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

  • PARAGON ENERGY SOLUTIONS, LLC

    CSA-B51 Fittings

  • PARSON REFRIGERATION (1985) LTD

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

  • PATERSON WELDING

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

  • PATRICK MECHANICAL LTD.

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), CSA-B51 Fittings

  • PAUL MUELLER COMPANY

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • PCL INDUSTRIAL CONSTRUCTORS INC

    Vessels, Pumps, Valves, Piping & Containment (N with NA), CSA-N285.0 Nuclear Fittings (SHOP ONLY)

  • PERFECT TEMP INC O/A ORZECH HEATING AND COOLING

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

  • PERMA-PIPE INC.

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

  • PERRY REFRIGERATION LIMITED

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

  • PINACLE STAINLESS STEEL INC

    Material Organization (MO) (Can be added to N/NPT)

  • PIPE-ALL PLUMBING & HEATING LTD

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