Generic CRN Registration Cammar Corporation

Generic CRN Registration

It makes the most sense to include as many options as possible in a generic CRN registration to minimize the frequency of applications. In general, it is up to the applicant how they want to organize their CRN registration applications in accordance with model numbers, equipment use, markets, etc.

To help optimize the registration process, it is important to consider what a generic design is and if it makes sense to use in your circumstance.
When a design includes options or variations, the design is called generic. In other words, a generic design describes a range of options for the equipment. And if the design is described properly, in many circumstances only one CRN is required for a generic fitting or a generic vessel.

Except for category ‘H’ fittings, any number of model numbers and configurations of the same category can often be included in one generic CRN registration. For example, a bunch of control valves, ball valves, globe valves and butterfly valves are all inline valves and could all be included in a single category ‘C’ CRN registration number. Or a bunch of ASME B16.5 and custom ASME Section VIII-1 Appendix 2 flanges could all be included in a single category ‘B’ registration number. Similar considerations apply for pipe fittings (category ‘A’), expansion joints (category ‘D’), strainers, filters, evaporators and steam traps (category ‘E’), instrumentation including measuring devices like pressure gauges, level gauges, sight glasses, levels, and pressure transmitters (category ‘F’), and certified relief valves and fusible plugs (category ‘G’). Generic category ‘H’ fittings can also be registered but requirements are a bit more restrictive and akin to generic vessel registration.

Generic vessel CRN registration requirements are more restrictive. Authorized inspectors need to quickly ascertain whether a vessel design meets registration requirements or not. So, to avoid generic vessel applications where every conceivable option and geometry is proposed for registration under a single CRN number, some guidelines have been put in place by ABSA. In addition to ordinary design requirements, generic vessels are also to have:

  • fixed maximum allowable working pressure (MAWP)
  • fixed maximum allowable temperature
  • fixed minimum design metal temperature
  • fixed corrosion allowance
  • fixed head geometry and thicknesses
  • fixed diameter(s)
  • all relocatable and optional nozzles, together with their potential locations, identified
  • a nozzle spacing chart for relocatable nozzles meeting requirements of ASME Section VIII-1 paragraph UG-36 for pairs and clusters
  • only one nozzle configuration (neck thickness, internal projection, weld size and reinforcement) for each nozzle size, except for ASME Section VIII- paragraph UW-16(f) fittings

To achieve the maximum amount of spacing variations, nozzles normally exempt from reinforcement per ASME Section VIII-1 paragraph UG-36 should instead be reinforced.

Depending on complexity, generic vessel designs might take slightly longer for the regulator to evaluate and register, but if all possible variations of a vessel are included with one CRN number, it is of benefit to the design owner to register a generic design. Even complex generic designs can be described clearly so that registration is not significantly delayed.

Answer Key

CRN Renewal Q&A

In this space, some questions posed by customers and industry are published in case others have similar questions. Anonymity is preserved. Check back for updates and new correspondence.

Dear Cammar,
We have a fitting CRN for some equipment in Alberta and a second Canada wide fitting CRN that originated in Ontario for different models of the same equipment category. If we renew the Canada wide CRN, is it advisable or possible to add the equipment registered in Alberta to the Canada wide CRN that was first registered in Ontario?
Thanks,
I M Interested


Dear Interested,
In general:

  • In general, fittings registered with a CRN in one province can be added to a Canada wide registration that has a different CRN, subject to regulator acceptance. It is arguably easier for manufacturers to have one CRN for all of Canada to avoid a very problematic situation where the CRN and province to where the equipment is shipped or stocked do not match. Our advice therefore continues to be that when equipment is to be used in all provinces, Canada wide registration should be sought whenever possible to best avoid any problems associated with not doing so.
  • Some categories of fitting registrations like piping (Category A), flanges (category B), or inline valves (Category C), etc. can include any combination, or number of models if requested by the manufacturer, but at the discretion of the regulators. Category H fittings are less accommodating.
  • Regulators will try to avoid duplicate CRN numbers in their province if they become aware of overlap, to help ensure consistency and avoid confusion. If an overlap is noticed, the applicant might be asked to not renew or merge one CRN in favour of the overlapping Canada wide one.
  • For example, if Ontario adds fittings registered in Alberta to 0******.5**, then if/when Alberta agrees to the addition and if they notice, Alberta might well ask that fittings already registered in Alberta be extracted from 0*****.2 or if the fittings already registered in Alberta comprise all the designs in 0*****.2, they might ask that 0*****.2 be merged with the Ontario based registration number. (Actual CRNs are masked to preserve anonymity)
  • If a fitting CRN has a ‘2’ after the decimal, then additions to the existing CRN must be initiated in Alberta. Additions must be initiated in the province where the CRN was first issued, else the amended CRN would be invalid since the originating province would not know about the addition and a new CRN would need to be issued by an alternate province if it accepts the application for registration.
  • Fitting CRN registration will expire 10 years from the date of the first registration or latest renewal, not 10 years from the date of the last addition.
  • Each province has a ‘final call’ for their region as to whether they want to accept or merge an addition to a CRN or not. Ontario does not have a final call for Alberta. If, for example, Ontario requires X# of FEAs but Alberta later requires more FEAs or other requirements, then despite previous registration in Ontario, Ontario will subsequently need to accede to Alberta’s request and reconsider the application again if the addition is to be considered for registration in Alberta. That is why it is important to first register equipment in the province that has what is perceived to be the most challenging requirements for any particular application. And similarly, Ontario is under no obligation to merge fittings registered in Alberta as an addition to an Ontario based CRN.
Answer Key

Harmonizing CRN Process Benefits Q&A

In this space, some questions posed by customers and industry are published in case others have similar questions. Anonymity is preserved. Check back for updates and new correspondence.

Dear Cammar,
I read your article about harmonizing the CRN process, in which it is stated that we need CRN’s. I am puzzled about the benefit to the general public safety of this process for fittings, seeing that this is only practiced in Canada. How do we compete with countries that don’t have CRN process? How can we claim to have a higher standard of safety, when the rest of the world manages quite fine without CRNs for fittings? How do we produce a compliant design when equipment is available but without a CRN that the manufacturer does not see the need to apply for and register their product?
I look forward to hearing from you.
Concerned Ontarian


Dear Concerned Ontarian,
Thanks for your email.
Governments in Canada deem the CRN process worthwhile and pursuant to public safety, given that CSA B51 is referred to in Canadian legislation. CSA B51 helps to ensure through third party oversight that pressure equipment is designed, built and tested to codes and referenced standards that have, through careful collective deliberation, been written to help ensure public safety by using adequate safety margins and other considerations.
These codes and standards are adopted by legislation and stipulate minimum requirements. In some foreign locales where CRNs are not required, designs do not always meet minimum code and referenced standard design philosophies. And when they do not, designs are therefore less safe than those that do.
In Canada, pressure equipment designs meeting legislated requirements are competitive and registerable.
Public safety is, I’m sure you would agree, of paramount importance.