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

  • 1000 ISLANDS MECHANICAL LTD

    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)

  • 1022013 ONTARIO LIMITED O/A SUPERIOR INDUSTRIAL SERVICES

    Boiler & Pressure Vessel Repair/Alteration (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)

  • WESTON VALVE & FITTING LTD.

    Power Piping Installation ASME B31.1 (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP ONLY), Medical Gas Piping Installation CSA-Z7396.1 (SHOP ONLY), CSA-B51 Fittings

  • Newton

    Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD)

  • Newton-1

    Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD)

  • 1048484 ONTARIO LTD. O/A B.C. MECHANICAL SERVICES

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

  • 1051130 ONTARIO LIMITED O/A ERIN REFRIGERATION & AIR CONDITIONING

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

  • 1067883 ONTARIO LIMITED O/A HI-TECH PLUMBING

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

  • 1074023 ONTARIO LIMITED O/A TALEVI WELDING

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), CSA-B51 Fittings

  • 1113388 ONTARIO LTD O/A MCDONALD MECHANICAL

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

  • 1145365 ONTARIO LTD O/A SPECIALTY MACHINE & FABRICATION

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

  • 1173652 ONTARIO LTD O/A BESTERD MECHANICAL

    Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), ASME PP-2-Section I Boiler External Piping (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD)

  • 1194400 ONTARIO LIMITED O/A OLD TYMER WELDING

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

  • 1195714 ALBERTA LTD

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • 1203130 ONTARIO INC. O/A MILL-FAB

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

  • 1246175 ONTARIO LTD O/A ACTIVE MECHANICAL

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

  • 1291631 ONTARIO INC O/A RAPID COOLING

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

  • 1352984 ONTARIO INC O/A LADS MECHANICAL

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

  • 1412575 ONTARIO INC

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD)

  • 1425673 ONTARIO LIMITED O/A SELLECK MECHANICAL

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