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

  • THERMON CANADA INC.

    CSA-N285.0 Nuclear Fittings (SHOP ONLY), CSA-N285.0 Nuclear Fitting Repair or Modification (SHOP ONLY), Power Piping Installation ASME B31.1 (SHOP & FIELD), ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP & FIELD), ASME U2-1-Sec. VIII, Div 2 Pressure Vessel Mfr. (SHOP ONLY), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), ASME S-1-Section I Boiler Manufacture (SHOP ONLY), ASME H-1-Section IV Boiler Manufacture (SHOP ONLY), CSA-B51 Fittings, Vessels, Pumps, Valves, Piping & Containment (N with NA)

  • THOMAS LEMMON & SONS ( 1973 ) 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)

  • THOMAS MAINS LIMITED

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

  • THOMPSON BOILER WORKS INC

    Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), ASME A-1-Section I Boiler Assembly (FIELD ONLY), Process Piping Installation ASME B31.3 (SHOP & FIELD), ASME H-6-Section IV Boiler Assembly (FIELD ONLY)

  • THYSSEN MINING CONSTRUCTION OF CANADA LTD

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

  • TIERNEY BROTHERS MECHANICAL 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), Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)

  • TILLEY MECHANICAL TECHNOLOGIES, INC ENVIROSEP FLUID & HEAT RECOVERY SYSTEMS

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

  • TISDALE MECHANICAL CONTRACTING LTD.

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

  • TISI CANADA INC.

    Hot Tapping and Line Stopping, Online Leak Sealing

  • TIW STEEL PLATEWORK INC.

    ASME PP-2-Section I Boiler External Piping (SHOP & FIELD), ASME U-4-Sec. VIII, Div 1 Pressure Vessel Mfr. (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), ASME A-2-Section I Boiler Assembly (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), ASME S-2-Section I Boiler Manufacture (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), CSA-B51 Fittings, ASME U2-3-Sec. VIII, Div 2 Pressure Vessel Mfr. (SHOP & FIELD)

  • TKO INDUSTRIAL SERVICES CORPORATION

    Hot Tapping and Line Stopping, Online Leak Sealing, CSA-B51 Fittings, Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY)

  • TL MECHANICAL INC.

    Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • TOM HALL REFRIGERATION LTD

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

  • TORION PLASMA CORPORATION

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