In Ontario, any industrial gas-fired appliance that exceeds standard certified appliance ratings — including custom burner systems, industrial furnaces, rotary dryers, mine air heaters, and thermal oxidizers — requires a formal Field Approval from the TSSA before installation.
Complete Combustion prepares complete TSSA Field Approval engineering packages under a PEO Certificate of Authorization.
A TSSA Field Approval is required when an industrial gas-fired appliance cannot be certified under a standard appliance certification program. This applies to custom-built burner assemblies, modified certified equipment, high-capacity industrial systems, and field-assembled valve trains.
Every submission requires a licensed P.Eng-stamped Piping and Instrumentation Diagram prepared to ANSI/ISA-5.1 standards, showing all fuel gas piping, dual SSOV configuration with POC switches, and HIGH/LOW pressure switches.
A complete hydraulic pressure loss analysis demonstrating that the fuel train delivers the required pressure at the burner manifold under peak firing conditions.
Mathematical verification of minimum four air changes of the total combustion chamber volume before ignition is permitted.
Complete BMS wiring schematic showing flame safeguard controller, flame scanners, airflow proving switches, and all safety interlocks.
Step-by-step burner startup, modulation, and shutdown sequence, plus an itemized list of all fuel-wetted components with certification status.
How long does TSSA Field Approval take in Ontario?
Typical review timelines are 4 to 8 weeks from submission. Incomplete submissions requiring revision cycles significantly extend this.
Can we start installation before Field Approval is granted?
No. The equipment must not be operated until the TSSA Field Approval is in hand.
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