The ASME B16.9 Steel Pipe 3D/5D Bends are high-performance elbows designed for specialized flow requirements. Unlike standard 1.5D elbows, these "Long Radius" bends have a centerline radius of 3 or 5 times the nominal pipe diameter. This gradual curvature significantly reduces internal turbulence, pressure drop, and abrasive wear. They are primarily used in high-velocity gas lines, slurry transport, and "pigging" systems where maintenance tools must pass through smoothly.
Technical Attributes: ASME B16.9 3D/5D Bends
Design Standard,ASME B16.9 / ASME B16.49
Bend Radius,3D (3× NPS) or 5D (5× NPS)
Available Angles,22.5°,30°,45°,60°,90°
Material Grades,"ASTM A234 WPB, WP11, WP22, A420 WPL6"
High Yield Grades,ASTM A860 WPHY 42/52/60/70
Size Range,1/2" to 48" (DN15 - DN1200)
Manufacturing,Hot Induction Bending or Cold Forming
Wall Thickness,SCH 10 to SCH XXS
End Connection,Butt Welding (BW)
End Preparation,Beveled Ends per ASME B16.25
Bending Tolerance,Radius ±1%; Ovality ≤3%
Heat Treatment,Normalizing / Quenching & Tempering
Wall Thinning,Strictly controlled at the outer curve (Extrados)
Surface Treatment,"Black Varnish, FBE Coating, or Galvanized"
Testing,"Hydrostatic, UT, MT, Dimensional"
Certification,EN 10204 3.1 / MTR
Traceability,Heat Number & Material Stamped
Primary Use,"Pigging Systems, Slurry Lines, Oil & Gas"
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