CRN Issue 1

[mfoote]

I have what I feel is a non-issue, but another engineer in my office feels that it is an issue, and I need some clarification. We design pipe systems to B31.1, also, being in Canada we require CRN's for any fitting or valve in the system. At some point in the past few years, an engineer in our office has insisted to a vendor that the CRN's for their fittings and valves are to be for B31.1 pipe systems. From my understanding, the CRN has nothing to do with what type of pipe system the fitting will be installed in, it's just registering a design of a fitting for a given temp & pressure range.

Is my understanding correct?

Thanks in advance.

 

[BigInch]

It would seem that it is the system that has something to do with the CRN being required, rather than the CRN making any requirement of the system. It also appears that CB51 requires CRNs under certain circumstances for certain pieces of equipment, flanges and fittings, in certain types of systems and it appears to be a little more than just registering pressure and temperature requirements. I am certainly not an expert CNRs, so read this while we wait for a Canadian guy to check in on this topic,

http://www.pveng.com/CRN/CRNOverview/CRNOverview.php

http://www.pveng.com/CRN/Piping/Piping.php

http://www.pveng.com/CRN/Fittings/Fittings.php

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[TenPenny]

I beleive you are correct, I do not recall CRNs ever having anything in particular to do with B31.1.

Seems to me that CRNs just mean that the design of the fitting / valve has been reviewed and approved by an engineer, and registered with the applicable province(s) as being an approved design.

 

[Jmoore1]

TenPenny is correct, CRN's are required for pressure retaining equipment/parts here in Canada. They do not need to be to a specific code but the registration does ask for what code they are designed to. They are then approved by a P-Eng at the local pressure vessel authority for the province.

All valves and fittings will required a CRN number designed to a code and approved by the local authority, the code you choose is up to you. All standard valves and fittings will already have a CRN number associated with them and owned by the fabricator.

 

[mfoote]

All... awesome, thank-you for the responses.

Jmoore1, that's exactly how I interpreted the situation, good to know I wasn't off my rocker .

 

[curtis2004]

CRN for components is nothing to do with CRN for registering your piping system.
In accordance with Canadian code B51 all pressure components of any piping system should have CRN. Table 1 (page 27 of the code) gives categories of fittings. For instance, category A is all pipe fittings, tees, elbows etc; category B is flanges; category C is all line flanges; and so on.
This is on top of ASME/ANSI standards, and each province has it's own registering body. Some provinces exempt from registration requirements for some category fittings. You have to contact provincial body who is responsible for registering.

Regards,

Curtis

 

[Gator]

I used to deal with multiple Canadian provincial authorities when I did installations for an industrial gas company. Some are more "picky" than others.

http://www.absa.ca/Design Survey/FAQs.aspx#CRN

Dunno if this helps.



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