CRN for fittings in non-pressure service 2

[Murec]

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

 

[moltenmetal]

This is non-code piping and hence no CRNs are required. That's IF the piping is protected by a relief device set no higher than 15 psig. Operating pressure doesn't matter: RELIEF pressure is what's important here.

HOWEVER...owners can ask you to supply ANYTHING they want via owner specs. They can tell you they want CRNs, mill certs, positive materials identification etc. for these fittings and you must comply if your contract tells you so. The only thing the owner CAN'T do in this case is say that "the code requires it".

 

[eliebl]

I do not expect that CSA B51 would be applicable to the non-expansible fluid piping in a wastewater treatment plant.

The scope of B51 states that "fittings as provided by the Act", where "Act" refers to local regulations governing pressure equipment. In the case of Alberta, the regulations only apply to services where there is conveyance of expansible fluid. That is, gases of fluids at such a temperature and pressure that when released to atmosphere they will generate vapour.

For Alberta see:

http://www.qp.gov.ab.ca/documents/Regs/2006_049.cfm?frm_isbn=9780779734825

Also go to ABSA.ca for the organization in charge of the regulation.

For Ontario you will need to

http://www.tssa.com.

Regards,
EJL

 

[Murec]

Thank you all - your answers confirm my opinion.
In this case the owner is an oil company and they were trying to build the water and wastewater infrastructure to API standard, same as the production plant. The result was a huge increase in cost, now they are loking for ways to save money.

 

[vesselguy]

Murec,
eliebl and moltenmetal are correct. You don't have to register the piping in water service. However, most, if not all fittings you buy is likely already have a CRN number in Canadian jurisdictions and so it should not be a problem to get and should not be any cost extra; correct me if I'm wrong please.

To get an owner to give up on a requirement, just show them the total cost difference and you will win the case.