Download Director's Advisory FS-210-14 - Here (http://www.hvactechgroup.com/article.php/20140407165712609)
The TSSA provides clarification regarding the revision to CSA B149.1-10, Clause 6.2.5.
QuoteIt is impossible without laboratory testing to determine if flare nuts were forged or extruded.
Requirements:
1. Externally machined flare nuts installed prior to December 1, 2012 are not required to be replaced unless they leak or an appliance is being replaced.
2. Subsequent to December 1, 2012 when replacing an appliance, any non-compliant flare nut used at the point of appliance connection shall be replaced (other flare nuts are not required to be replaced).
3. As flare nuts might not be marked to confirm compliance with clause 6.2.5, it is the responsibility of the installer to ensure that flare nuts are Code-compliant and to provide proof of compliance upon request
Since it's impossible for us to identify the difference between a forged or extruded flare nut, we will be forced to replace every flare nut at the appliance connection when replacing the appliance, unless it is forged from UNS C37700 brass.
QuoteClause 6.2.5 - Flare nuts shall be forged from UNS C37700 brass and shall not be externally machined.