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

  • ADAMSON & DOBBIN LTD

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

  • ADEY BROTHERS SCAFFOLDING SOLUTIONS LTD.

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

  • ADM STAINLESS INC.

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

  • ADVANCE MILLWRIGHTS INC.

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

  • ADVANCED PROCESS DESIGN/FABRICATION LTD.

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

  • ADVANCED STAINLESS INC

    ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), CSA-B51 Fittings

  • AECON CONSTRUCTION GROUP INC. O/A AECON INDUSTRIAL

    Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), ASME U-4-Sec. VIII, Div 1 Pressure Vessel Mfr. (SHOP & FIELD), CSA-B51 Fittings, ASME S-2-Section I Boiler Manufacture (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Shop Assembly (NA), CSA-N285.0 Nuclear Fittings (SHOP ONLY), Vessels, Pumps, Valves, Piping & Containment (N with NA), CSA-N285.0 Nuclear Fitting Repair or Modification (SHOP & FIELD), CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY)

  • AECON CONSTRUCTION GROUP INC. O/A AICS

    CSA-B51 Fittings, ASME S-2-Section I Boiler Manufacture (SHOP & FIELD), ASME U-4-Sec. VIII, Div 1 Pressure Vessel Mfr. (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)

  • AIM INDUSTRIAL 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), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • AINSWORTH INC

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

  • AIR AID MECHANICAL LIMITED

    Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • AIR DESIGN SERVICES INC

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

  • AIR HEAT MECHANICAL SERVICES INC

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

  • AIR KOOL LTD

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

  • AIR LIQUIDE CANADA INC

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