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A234 WPB "S or seamless"

A234 WPB "S or seamless"

A234 WPB "S or seamless"

(OP)
I am revising a piping materials spec. that has A234 WPBS listed as the material for fittings.  In the ASTM book (I only have '97) it states that you can specify a welded fitting by supplementing the letter "W" to the grade and marking symbol (A234 WPBW).  The version of MSS SP-25 I have states the same.  My question is if it is industry standard to supplement "S" to the grade and symbol marking when seamless is desired, and if this is a recognized method for specifing the construction method?  (I don't want someone to start looking up "S," thinking it means some type of supplementary requirement.)

RE: A234 WPB "S or seamless"

The only supplementary marking, other than 'W', I can find in A-234 spec. is 'S9' that indicates the fitting is not fully compliant with dimensional standards.

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