CRN fittings in WWTP

[Murec]

I also posted this question on the Piping forum, I don't know who would be more qualified to answer.

I am appealing to Canadian engineers:

I am working on a waste water treatment plant. We have piping for water and similar at low pressure and some aeration pipes at 30 kPa (4.5 psi).
One of my colleagues, with an oil and gas background, claims all fittings require CRN numbers, based on CSA B51. I think that this is not required, neither for water nor for air below 103 kPa.

Could you please shed some light on this issue?

Thanks

M

 

[Pulpeng]

I am in Alberta - ABSA rules here.

In general I look for CRN fittings. It avoids a lot of hassles. That being said there are times when it is not required. Talk to you QA/QC people or pressure vessel authority to make sure but here's a quick link. Scroll down to the flow sheets.

http://www.pveng.com/m/content/article.php?content_id=6