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3D BEND to ANSI B16.9 Dimensions

thread174-37776

3D BEND to ANSI B16.9 Dimensions

3D BEND to ANSI B16.9 Dimensions

(OP)
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

RE: 3D BEND to ANSI B16.9 Dimensions

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.

RE: 3D BEND to ANSI B16.9 Dimensions

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

See:  www.pfi-institute.org/

ANSI B16.9 does not apply to 3D bends

MJC

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