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).”

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TSSA Registered Certificate Of Authorization

  • QUINTE HYDRAULIC SERVICE INC.

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

  • R & R MECHANICAL GROUP INC

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

  • R J GILLESPIE ENTERPRISES LTD

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

  • R. W. HAMILTON LTD

    CSA-B51 Fittings

  • R.F. CONTRACTING INC

    ASME PP-2-Section I Boiler External Piping (SHOP & FIELD), 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), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • R.S. FINISHING SYSTEMS INC.

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

  • RACKAIR (KINGSTON) INC

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

  • RAIN CARBON CANADA INC.

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

  • RAINBOW ELECTRONICS SPOTWELDING INC

    ASME H-1-Section IV Boiler Manufacture (SHOP ONLY)

  • RANDALL PLUMBING & HEATING LIMITED

    Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • RASSAUN SERVICES INC

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

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

  • READAIR MECHANICAL SERVICES LTD.

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

  • RED FLAME INDUSTRIES INC

    Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)

  • REFRIGERATION VESSELS AND SYSTEMS CORP

    Refrigeration Piping Installation ASME B31.5 (SHOP ONLY)

  • REFWORX INC.

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

  • RIDGE MECHANICAL CONTRACTORS INC.

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

  • RIGID WELDING INC.

    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), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD)

  • RITE WAY MECHANICAL LTD

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

  • RITE-TEMP REFRIGERATION INC.

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

  • RMP WELDING AND REPAIR INC.

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