CRN Issue
CRN Issue
(OP)
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.
Is my understanding correct?
Thanks in advance.





RE: CRN Issue
ht
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
RE: CRN Issue
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.
RE: CRN Issue
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.
RE: CRN Issue
Jmoore1, that's exactly how I interpreted the situation, good to know I wasn't off my rocker
RE: CRN Issue
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
RE: CRN Issue
http://www.absa.ca/Design%20Survey/FAQs.aspx#CRN
Dunno if this helps.
Piping Design Central ://www.gul fpub.com/p roduct.asp ?PositionI D=campaign &Produ ctID=10679">The Planning Guide to Piping Design</a>
www.pipingdesign.com
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