Ontario CRN Requirements: TSSA Registration Guide

Reviewed by Dhruv Barot, P.Eng. · Last updated: March 1, 2026

Ontario is Canada's largest industrial province and home to the Technical Standards and Safety Authority (TSSA), which administers pressure equipment design registration. Kopfkino Consulting, headquartered in Vaughan, Ontario, has deep expertise in TSSA submissions.

This guide covers TSSA's technical requirements. For end-to-end submission support, see our Ontario CRN registration service.

TSSA's Role and Mandate

TSSA is an independent safety regulator responsible for safe operation of boilers, pressure vessels, and related equipment under the Technical Standards and Safety Act (TSSA Act) and O. Reg. 220/01.

Ontario Pressure Equipment Exemptions (O. Reg. 220/01)

• Vessels with MAWP not exceeding 15 psig
• Vessels with internal diameter not exceeding 6 inches
• Vessels with volume not exceeding 1.5 cubic feet below 250°F
• Small water heaters and domestic appliances

Ontario CRN Submission Process

• Submit through TSSA online portal
• Ontario P.Eng. signature required on all authenticated documents
• TSSA Data Sheet (Form OE-E01) required for vessels
• Review time: 8-16 weeks typical

Key Ontario Industries

Automotive, food and beverage, pharmaceutical, chemical, HVAC, power generation, and water treatment industries all require Ontario CRN registrations. Kopfkino serves manufacturers across all of these sectors.

Frequently Asked Questions

Does TSSA accept electronic submissions?

Yes. TSSA's online portal accepts electronic submissions with digital P.Eng. authentication. Kopfkino submits all Ontario packages electronically.

"TSSA's online portal is efficient when the package is right: a clean P.Eng.-reviewed submission with the correct data sheets typically clears toward the lower end of the 8-to-16-week range. Incomplete packages are what turn Ontario into a bottleneck."