ansi 9standards0 code issues - 3d bend to ansi b16.9 dim

huangyhg

ansi 3d bend to ansi  b16.9 dim
does ansi  b16.9 explicitly state geometry of 3d bends, ie. shall nominal or outer diameter apply to the bending radius? or must this be specified by the buyer? i would be happy if a possible explicit statement of this could be referred to.
regards, espen
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hello,
regarding elbow fittings, ansi /asme standard b16.9 specifies only welding elbows of 1.0 r and 1.5 r.  the bend radius is based upon nominal pipe size, not actual pipe od.  i am not aware of any ansi  standard for other types of multiple radius pipe bends.
regards, john.
espen,
3d bends are governed by the rules contained in asme b31.1/31.3.
there is also an old recommended industry guideline by the piping fabrication institure (pfi) that governs all types of bends for many thickness of piping