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Fitting Categories

Fittings registrations are done by categories, which can be found in Table 1 of CSA B51:
Category
Type of Fitting
A
Pipe fittings, including couplings, tees, elbows, wyes, plugs, unions, pipe caps and reducers
B
All flanges
C
All line valves
D
All types of expansion joints, flexible connections, and hose assemblies
E
Strainers, filters, separators, and steam traps
F
Measuring devices and indicating devices, including pressure gauges, level gauges, sight glasses, levels, and pressure transmitters
G
Certified capacity-rated pressure relief devices acceptable as primary overpressure protection on boilers, pressure vessels and pressure piping, and fusible plugs
H
Pressure-retaining components that do not fall into Categories A to G
Notes:
  1. These categories do not take into account size, material, end connections, ratings, schedules, and methods of fabrication.
  2. Category H can include
    1. Small pressure vessels registered and inspected as specified in Figure 1 a), 1 b), or 1 c) (figures found here).  Such pressure vessels shall be designed and constructed in accordance with Clause 7, except that items that fall under Figures 1 a) and 1 b) may be designed and constructed to Clause 8, provided that the pressure vessel 
      1. Does not require full radiography in accordance with the ASME Code;
      2. Does not have a quick-actuating closure;
      3. Is not in cyclic service; and 
      4. Is 4 NPS or smaller;
    2. An assembly of components (including piping components), provided that the diameter of any component does not exceed 152mm (6 in) and the total volume of the assembly does not exceed 42.5 L (1.5 ft3).  Such an assembly is considered a single Category H fitting for the purpose of fitting registration; and 
    3. Condenser coils and evaporator coils as defined in CSA B52 and air heater coils, provided that the diameter of any component does not exceed 152 mm (6 in) and the design pressure does not exceed 4.14 MPa (600 psig)

Fitting Exemptions

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The source document can be found here.

  • Categories A, B, C exempt from registration provided they are designed to standards listed in Table 126.1 (B31.1), Table 326.1 (B31.3), Table 526.1 (B31.5) or Table 926.1 (B31.9). 
  • Category G if marked with an ASME or NB stamp
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The source document can be found here.

  • Categories A, B, C exempt from registration provided they are designed to standards listed in Table 126.1 (B31.1), Table 326.1 (B31.3), Table 526.1 (B31.5) or Table 926.1 (B31.9). 
  • Category G if marked with an ASME or NB stamp
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The source document can be found here.

Category A, B, C, and G. They no longer provide CRNs in these categories, and they no longer require them on registered vessels or piping systems.

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The source document can be found here (Article 8 of the Quebec Boiler and pressure vessel regulations).

Categories A, B, C exempt from registration provided they are designed to standards listed in Table 126.1 (B31.1), Table 326.1 (B31.3), Table 526.1 (B31.5) or Table 926.1 (B31.9).

PE Design can help you register any type of fitting.  To learn more about the common ASME standards we support, click here.

Fitting Codes

PE Design can help you register any type of fitting.  Whether it is an ASME standard, such as one of the examples listed below, or a custom fitting that doesn’t fall into a known standard.  If you have a custom design Blue Diamond Design will help you determine the best design code for your product.

Common ASME Fitting Standards:

B16.5 – Pipe Flanges & Flanged Fittings

  • 1/2 NPS Through 24 NPS
  • CL150, CL300. CL400, CL600, CL900, CL1500, CL2500


B16.9 – Factory Made Wrought Steel Butt-Welding Fittings

  • 1/2 NPS Through 48 NPS
  • Butt-Welded Elbows, Tees, Reducers, Caps, etc.


B16.11 – Forged Steel Socket Welding & Threaded Fittings

  • 1/8 NPS Through 4 NPS
  • Threaded Fittings: CL2000, CL3000, CL6000
  • Socket Weld Fittings: CL3000, CL6000, CL9000


B16.34 – Valves-Flanged, Threaded, and Welded End

  • 1/4 NPS Through 24 NPS
  • CL150, CL300, CL600, CL900, CL1500, CL2500, CL4500


B16.47 – Large Diameter Steel Flanges

  • 26 NPS Through 60NPS
  • CL75, CL150, CL300, CL400, CL600, CL900
We are your one stop for the design, review, and registration of your pressure retaining equipment needs.
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