Last Updated: Dec 13/2010, By: LB

FlangeUnder the B51 program fittings need to be registered before they can be used on pressure devices. However, fittings on pressure vessels are exempted from requiring registration by B51-09 clause 4.2.1:

Fittings shall be registered in accordance with Clauses 4.2.2 to 4.2.9 unless they form a part of a boiler or pressure vessel that is subject to inspection by an authorized inspection agency. Registrations of fittings shall be resubmitted for validation not more than ten years after the date of acceptance by the regulatory authority in the original registering province or by a nationally recognized organization as specified in Clause 4.2.3.

In practice, all fittings on pressure vessels need to be registered except those listed in VIII-1 UG-44:

UG-44(a) ASME BI6.5, Pipe Flanges and Flanged Fittings [see UG-ll(a)(2)] UG-44(b) ASME B 16.9, Factory-Made Wrought Butt welding Fittings UG-44(c) ASME BI6.1l, Forged Fittings, Socket Welding and Threaded UG-44(d) ASME B16.l5, Cast Bronze Threaded Fittings, Classes 125 and 250 UG-44(e) ASME BI6.20, Metallic Gaskets for Pipe Flanges – Ring-Joint, Spiral-Wound, and Jacketed UG-44(f) ASME B 16.24, Cast Copper Alloy Pipe Flanges and Flanged Fittings, Class 150, 300, 400, 600, 900, 1500, and 2500 UG-44( g) ASME B 16.42, Ductile Iron Pipe Flanges and Flanged Fittings, Class 150 and 300 UG-44(h) ASME BI6.47, Large Diameter Steel Flanges, NPS 26 Through NPS 60

All other fittings will need registering. This exemption is applied to both ASME “U” vessels which are inspected by an authorized inspector and “UM” vessels which are not inspected by an authorized inspector. This exemption also applies to fittings which include any of the above.

In contrast B51-09 clause 8.2 demands the registration of fittings on piping systems:

“Fittings used in piping systems shall be registered in accordance with Clause 4.2.”

So these same fittings that are exempt on vessels which might be inspected by an authorized inspector are never exempt on piping systems that are always inspected by an authorized inspector. This made no sense to us so we made up a diagram to help illustrate:


The red items need registration*, the green items do not. Sense or nonsense, these are the rules as they are currently written and applied in Canada.

* Many of these fittings do not need to be registered for use in Saskatchewan or British Columbia (more here: Fittings).