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

  • DAEL THERMAL GROUP INC

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

  • DAEMAX REFRIGERATION LTD.

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

  • DALCON CONSTRUCTORS LTD. O/A PRO PIPE CONSTRUCTION

    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)

  • DALEX CANADA INC.

    Power Piping Installation ASME B31.1 (FIELD ONLY)

  • DALRAY CONTRACTING INC

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

  • DANDOR TRADE CORP

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

  • DAVE HURST PLUMBING & HEATING INC

    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)

  • DAVID CHARLES MACKINNON O/A ARCTIC REFRIGERATION & A/C

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

  • DAVID JONES MECHANICAL INC

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

  • DAY & ZIMMERMANN OF CANADA CORPORATION

    Vessels, Pumps, Valves, Piping & Containment (N with NA), CSA-N285.0 Nuclear Fittings (SHOP ONLY), CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY), ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY), CSA-B51 Fittings, Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD)

  • DDM MOBILE WELDING LTD*

    Hot Tapping and Line Stopping, ASME U-1-Mfr. of Sec. VIII, Div 1 Pressure Vessels (SHOP ONLY), CSA-B51 Fittings, Medical Gas Piping Installation CSA-Z7396.1 (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Refrigeration Piping Installation ASME B31.5 (SHOP AND FIELD), Process Piping Installation ASME B31.3 (SHOP & FIELD)

  • DEAN ROSS MCKINLEY O/A DIGGERS WELDING

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

  • DEAN-LANE CONTRACTORS INC

    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)

  • DELFIN TUBES, S.A.

    Process Piping Installation ASME B31.3 (SHOP ONLY)

  • DELTA FLUID SYSTEMS INC

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

  • DEMAND AIR SYSTEMS LTD

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

  • DEPENDABLE MECHANICAL SYSTEMS INC

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