Registering B16.9 Fittings
Last Updated: Dec 13/2010, By: LB
B16.9 fittings (elbows, tees, crosses, reducers, caps and stub ends) must be CRN registered before they can be used in Canadian CRN registered piping systems*. The 2009 B51 standard introduced a simplified approach to registering fittings found in table UG44 of the VIII-1 code book. B16.9 Fittings are one of these components in table UG-44:
At a minimum, the following documentation in support of an application for a new design registration or a reregistration shall be required: (a) for new applications for fittings that are built to a nationally recognized Standard (e.g., as listed in paragraph UG44, Section VIII, Division I, of the ASME Code or Table 326.1 of ASME B31.3) that specifies the dimensions, construction, materials, pressure/temperature ratings, and identification markings of the fittings (B51-09 4.2.6(a))
These components have a simplified registration process requiring only 3 items:
- a properly completed statutory declaration form for the registration of fittings clearly identifying the applicable nationally recognized Standard; –
- the manufacturer’s scope within the Standard; and
- the manufacturer’s identification marking(s). (B51-09 4.2.6(a))
This would work for B16.5 flanges where the dimensions, materials and pressure temperature rating are fully specified by the B16.5 code. Likewise other fittings listed in UG-44 are also fully specified by the design standard so there is nothing for the manufacturer to design. The problem is that ASME Standard B16.9 does not specify wall thicknesses, so this simplified registration process cannot be applied.
The design of fittings shall be established by mathematical analyses (e.g. ASME B16.49 for bends) contained in nationally recognized pressure vessel or piping codes or at the manufacturer’s option by proof testing in accordance with section 9 of this Standard. In order to meet design or manufacturing requirements, it is expected that some portion of formed fittings may have to be thicker than the pipe wall with which the fittings is intended to be used. The mathematical analyses, if used, may take into account such thicker sections. Records of mathematical analysis and/or successful proof test data shall be available at the manufacturer’s facility for inspection by the purchaser. (B16.9-2001 Section 2.2 “Design of Fittings”)
The user of a B16.9 fitting calculates its pressure rating as an equivalent piece of straight pipe. The manufacturer of the fitting has to provide proof that the fitting is the same strength as that straight pipe. A longer registration process is required:
- a properly completed statutory declaration form for the registration of fittings;
- the designation of the Code or Standard;
- material specifications;
- identification markings;
- dimensions; and
- detailed calculations and/or copies of proof test results witnessed by an inspector or an authorized inspector and acceptable to the regulatory authority
- (B51-09 4.2.6(b))
Once the manufacturer provides this proof, along with other provincially required paperwork to each jurisdiction and gets the registration back, then the B16.9 fittings can be used in registered Canadian piping systems.
*B16.9 fittings do not need to be registered for use in Saskatchewan or British Columbia (more here: Fittings).