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

  • MDF MECHANICAL LTD

    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)

  • MECHANICAL TRADE INDUSTRIES LTD

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

  • MECO

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • MESSENGER MECHANICAL SERVICES INC O/A A1 AIR CONDITIONING AND HEATING

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

  • MESSER CANADA INC.

    Process Piping Installation ASME B31.3 (SHOP & FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD)

  • METAL-AIR MECHANICAL SYSTEMS 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)

  • MIC MECHANICAL CONTRACTING 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)

  • MICHAEL RICHARD SANDERSON O/A MIKE'S WELDING

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

  • MIDHURST REFRIGERATION LTD.

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

  • MIKE WITHERELL MECHANICAL LTD

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

  • MILLCREEK PLUMBING & MECHANICAL LTD

    Power Piping Installation ASME B31.1 (SHOP & FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • MIURA CANADA CO LTD

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

  • MODERN NIAGARA OTTAWA INC

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

  • MODERN NIAGARA SOUTHWESTERN ONTARIO 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)

  • MODERN NIAGARA TORONTO INC

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

  • MONTGOMERY INDUSTRIAL 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)

  • MOORE ENVIRONMENTAL SYSTEMS LIMITED

    Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • MORIMATSU (JIANGSU) HEAVY INDUSTRY CO., LTD.

    Process Piping Installation ASME B31.3 (SHOP ONLY)