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

  • NUCLEOM

    Vessels, Pumps, Valves, Piping & Containment (N with NA), CSA-N285.0 Nuclear Fittings (SHOP ONLY)

  • NUTEMP MECHANCIAL 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)

  • NV PIPING SYSTEMS INC.

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

  • NWI PRECISION TUBE ULC

    Material Organization (MO) (Can be added to N/NPT), CSA-N285.0 Nuclear Fittings (SHOP ONLY)

  • OAKWOOD REFRIGERATION INC.

    Refrigeration Piping Installation ASME B31.5 (FIELD ONLY)

  • OLSONFAB METAL FABRICATION LTD

    Process Piping Installation ASME B31.3 (SHOP & FIELD), ASME U-4-Sec. VIII, Div 1 Pressure Vessel Mfr. (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)

  • OMICO MECHANICAL LTD

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

  • ONTARIO HOSE SPECIALTIES LTD

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

  • ONTARIO POWER GENERATION DARLINGTON NGS

    CSA-N285.0 Nuclear Fittings (SHOP ONLY), Vessels, Pumps, Valves, Piping & Containment (N with NA), Supports (NS) (Can be added to N/NPT/NA), CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY), Refrigeration Piping Installation ASME B31.5 (SHOP ONLY), Power Piping Installation ASME B31.1 (SHOP ONLY), Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY), CSA-B51 Fittings, Process Piping Installation ASME B31.3 (SHOP ONLY)

  • ONTARIO POWER GENERATION INC

    Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY), Owner/User Self Inspection of Repairs, Power Piping Installation ASME B31.1 (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP ONLY), Boiler & Pressure Vessel Repair/Alteration (SHOP & FIELD), Power Piping Installation ASME B31.1 (SHOP & FIELD)

  • ONTARIO POWER GENERATION INC - ATIKOKAN GS

    Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY), Owner/User Self Inspection of Repairs, Power Piping Installation ASME B31.1 (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP ONLY)

  • ONTARIO POWER GENERATION INC PICKERING NGS

    CSA-N285.0 Nuclear Pressure Relief Valve Repair (SHOP ONLY), Pressure Relief Valve Repair (SHOP ONLY), Vessels, Pumps, Valves, Piping & Containment (N with NA), CSA-N285.0 Nuclear Fittings (SHOP ONLY), Supports (NS) (Can be added to N/NPT/NA), CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY), Refrigeration Piping Installation ASME B31.5 (SHOP ONLY), CSA-B51 Fittings, Boiler & Pressure Vessel Repair/Alteration (SHOP ONLY), Process Piping Installation ASME B31.3 (SHOP ONLY), Power Piping Installation ASME B31.1 (SHOP ONLY)

  • ONTARIO POWER GENERATION INC.

    CSA-N285.0 Nuclear Item Repair, Modification or Replacement (FIELD ONLY), Boilers & Pressure Vessels Repair/Alteration (FIELD ONLY)