Large Diameter Stainless Steel 3D Elbow

The Large Diameter Stainless Steel 3D Elbow is a butt-weld pipe fitting for changing direction in large stainless steel piping. A 3D elbow uses a centerline radius of approximately three times the pipe outside diameter, creating a longer directional transition than a 1.5D elbow.

The fitting is used in process piping, water treatment, chemical processing, energy systems and marine piping. Available grades include 304L, 316L, 321, 904L, Duplex 2205 and Super Duplex 2507.

Large-diameter configurations can be produced to standard dimensions or engineering drawings, with control of bend geometry, wall thickness, end preparation and identification.

3D Bend Radius
The centerline radius follows the 3D configuration. For a 355.6 mm outside diameter, the nominal 90° center-to-end dimension is 1067 mm.

Large Diameter
The range covers NPS 14 to NPS 48 configurations, with outside diameters from 355.6 mm to 1219.0 mm.

Butt-Weld Ends
Weld ends are prepared for direct connection to adjoining pipe. Bevel geometry can be matched to the specified wall thickness and welding procedure.

Forming Control
Large-diameter forming requires control of radius, angle, ovality and wall distribution through the bend. These dimensions are checked at defined inspection points.

304L
Low-carbon stainless steel for general process and industrial piping where corrosion resistance and weldability are required.

316L
Molybdenum-bearing stainless steel for service conditions involving chloride exposure and increased corrosion requirements.

321
Titanium-stabilized stainless steel for applications where elevated-temperature service and resistance to intergranular corrosion are considered in material selection.

Duplex 2205
A duplex grade combining higher mechanical strength with resistance to several forms of corrosion. It is used for demanding process and fluid-handling systems.

904L and Super Duplex 2507
Higher-alloy options for applications requiring specific corrosion resistance and mechanical properties defined by the process conditions.

Material Preparation
Material is identified by grade, size and heat information before production. Heat information is linked to the production documentation.

Forming
The pipe or prepared blank is formed to the required 3D geometry. Diameter, wall thickness and material grade determine the forming conditions.

Heat Treatment
Heat treatment is applied where required by the material specification or production route. Duplex materials require controlled thermal processing to maintain the specified metallurgical condition.

End Preparation
Weld ends are cut and prepared to the required bevel dimensions. End diameter and wall thickness are checked before final inspection.

Surface Treatment
Pickling, blasting or polishing can be applied according to the specified surface condition and material requirements.

Bend Geometry
The 3D radius, bend angle and center-to-end dimensions are measured against the required drawing or dimensional specification.

Wall Thickness
Wall thickness is checked at defined sections through the elbow to verify material distribution after forming.

Ovality
Outside diameter measurements at the weld ends are used to verify end roundness and support pipe fit-up.

End Alignment
End-to-end dimensions and alignment are checked before release to maintain installation compatibility.

Material Verification
Material grade and heat information are checked against the relevant material documentation. Positive material identification can be included when specified.

Dimensional Inspection
Inspection covers outside diameter, wall thickness, bend angle, center-to-end dimensions and end preparation.

Visual Inspection
The surface, weld ends and formed areas are inspected for visible surface conditions and dimensional conformity.

Additional Testing
Ultrasonic, radiographic, penetrant, hardness or other specified testing can be arranged according to the project inspection plan.

Process Piping
Used for directional changes in large-diameter process lines where a 3D bend configuration is specified.

Chemical Processing
Applied in stainless steel process systems where material selection is based on process media, temperature and corrosion conditions.

Water Treatment
Used in large-diameter water and treatment lines requiring stainless steel pipe fittings.

Energy Systems
Suitable for large fluid-handling lines where the required material, diameter and bend geometry are defined by the system design.

Marine Piping
Used in selected marine piping systems requiring large-radius stainless steel directional fittings.

Drawing-Based Production
Engineering drawings can define outside diameter, wall thickness, angle, radius, end preparation, tolerances and marking.

Heavy-Wall Configurations
Large wall thicknesses require coordinated forming and inspection to maintain the specified bend profile and end dimensions.

Identification
Marking can include material grade, size, heat number, order reference and other specified identification data.

Packing
Large fittings are packed according to size, surface finish and transport requirements, with protection for weld ends and finished surfaces.

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