Spiral Wound Gaskets, Material Certificates

[juancito]

Dear all,

For spiral wound gaskets with 304 stainless steel winding material, what sort of certificate has to provide the gasket supplier, just chemical composition or mechanical properties too?
I read over and over the B16.20 and some catalogues from prestigious gasket manufactures and the winding material is only mentioned as stainless steel 304, 316, etc. So, seems that a chemical composition certificate would be suficient.
This story arose when our customer required a certificate as if the winding material were SA 240 Gr 304!
Any suggestions will be very welcomed.
Saludos

JJ

 

[gr2vessels]

Hi Juancito,
Depending on the application, the gasket has to conform to the referenced standard. I mean, in a severe corrosive application, you might call up the NACE MR 0175 or 0103, hence the winding has to be certified ro ISO 10204 class 3.1 or 3.2. However, in a normal application, I would expect a class 2.2 certification. Also, some specifications like Shell or ESSO, require the PMI to be fully complied with, hence an independent certification for the stainless steel component is a must (class 3.2). Please be a bit more specific to the specification you have to comply with, I hope to give you a bit more insight to your problrm.
Cheers,
gr2vessels

 

[juancito]

Dear GR2vessels,

Thank you for your comment.
The service which these gaskets are intended for is a plain one and there was not specific requirement regarding mats certificates type from our customer. Gaskets were just specified as stainless steel foil plus non asbestos fiber. So, a 2.2 certif. would be suficient. But again, are winding strip mechanical properties a must or not?
That`s the quiz.
Saludos

JJ

 

[gr2vessels]

No Juancito,
Tthe strip properties are embedded in the m and Y of the gasket and that's all you need to guarantee to the Client, unless as said, a corrosive environment is calling for positive material identification of the SS strips.
Cheers,
gr2vessels

 

[juancito]

Ok Gr2vessels,

thank you very much for your help. Although your answer is no the one I wish, I realize that your a right.
Thanks again.