Technical guide to CRN equipment categories from A to H, understanding required data sets for each category, and real-world examples of proper CRN documentation formats.
CRN Equipment Categories: The Complete Breakdown
Canadian registration authorities classify pressure equipment into distinct categories (A through H) based on type, function, and risk level. Understanding these categories is essential for proper CRN application and compliance.
Category A: Steam Boilers
Definition
Equipment designed to generate steam from heat and water for external use. Includes fire-tube, water-tube, and electric boilers.
Required Data Set
- Design pressure: Maximum allowable working pressure (MAWP)
- Design temperature: Operating and design temperatures
- Heating surface area: Total area in square meters
- Steam capacity: Kg/hr or lbs/hr output
- Fuel type: Natural gas, oil, electric, etc.
- Safety valve settings: Set pressure and capacity
- Water treatment: Feedwater quality requirements
Category D: Pressure Vessels (Unfired)
Definition
The most common category – vessels under internal pressure without direct heating. This includes most industrial pressure vessels.
Required Data Set
- Design pressure: MAWP in psig or kPa
- Design temperature: Min and max operating temperatures
- Volume: Internal volume in cubic feet or liters
- Dimensions: Inside diameter and length/height
- Shell thickness: Nominal and minimum after corrosion
- Material specification: ASME SA- grade for shell and heads
- Service: Contents and operating conditions
Category E: Pressure Piping
Definition
Piping systems operating above 15 psig containing process fluids, steam, or compressed gases.
Required Data Set
- Design pressure: System MAWP
- Pipe size and schedule: NPS and wall thickness
- Material specification: ASTM designation
- Fluid service: Steam, gas, toxic, flammable
Data Set Completeness Checklist
Regardless of category, ensure your CRN package includes:
Essential Documents
- Application form: Completed provincial authority form
- Design calculations: Thickness calculations per code
- Material certificates: MTRs for all materials
- Welding documentation: WPS, PQR, welder qualifications
- Design registration: ASME U-1 form or equivalent