ansi 9standards0 code issues - ansi b16.9

huangyhg

ansi ansi  b16.9
welded seam fittings are covered by ansi  b16.9 standards? or they must be seamless?
if you review asme/ansi  b16.9, this pertains to wrought butt welding fittings that could be welded or seamless. under paragraph 5), material, wrought fittings are covered under the following material specifications - astm a 234, a 403, a 420, a 815, b 361, b 363,  and b 366. for example, standard specification astm a 420 deals with welded or seamless carbon or low alloy steel fittings.
note; standard specification for welded or seamless carbon or low alloy steel fittings is a 234, not a 420.
thank you very much metengr.
your answer helped me too much.
nuke1973