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

  • SPRINT MECHANICAL INC

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

  • ST CLAIR MECHANICAL INC

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

  • STAINLESS PIPING SYSTEMS INC

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

  • STARK COMPRESSION, LLC

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • STARLIGHT COMBUSTION INC

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

  • STEELCORE FABRICATION LTD.

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

  • STEELCRAFT INC.

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

  • STELCO INC.

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

  • STELCO INC. O/A STELCO

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

  • STELLAR MECHANICAL INC

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

  • STERIS FINN AQUA

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • STERN LABORATORIES INC

    Power Piping Installation ASME B31.1 (SHOP ONLY), ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY)

  • STEVE KERR O/A GREY-BRUCE WELDING

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

  • STILMAS AMERICAS INC.

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

  • STONEHOUSE MECHANICAL LTD.

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

  • STRAIGHTLINE GROUP INCORPORATED

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

  • STREAMSEAL INC

    CSA-B51 Fittings, Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)

  • STRONGFAB SOLUTIONS, INC.

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • STUART OLSON INDUSTRIAL CONSTRUCTORS INC.

    CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY), CSA-N285.0 Nuclear Fittings (SHOP ONLY), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)