The Large Diameter Stainless Steel 5D Elbow is a butt-weld pipe fitting for changing the direction of large-diameter stainless steel piping. Its centerline radius is approximately 5 times the pipe outside diameter, giving the elbow a long-radius transition.
Typical configurations include 45°, 90°, and 180° elbows. Material options include 304L, 316L, 321, 904L, and duplex stainless steel, with dimensions and inspection requirements specified according to the piping standard or approved drawing.
Product Features
5D Radius
The centerline radius follows a 5D configuration, giving the fitting a longer bend geometry for large piping layouts.
Large-Diameter Construction
Large outside diameters can be produced according to the required pipe size, wall thickness, bend angle, and drawing dimensions.
Butt-Weld Ends
The ends are prepared for direct welding to the adjoining pipe. Bevel geometry and root-face dimensions can follow the applicable welding specification.
Stainless Steel Options
A range of austenitic and duplex grades is available for different process media, temperature conditions, and corrosion requirements.
Technical Parameters
|
Parameter |
Typical Specification |
|
Product |
Large Diameter Stainless Steel 5D Elbow |
|
Nominal Size |
DN200 and above |
|
Outside Diameter |
219.1 mm and above |
|
Bend Radius |
Approximately 5 × OD |
|
Elbow Angle |
45°, 90°, 180° |
|
Wall Thickness |
According to pipe schedule or drawing |
|
Material Grades |
304L, 316L, 321, 904L, Duplex Stainless Steel |
|
Connection |
Butt Weld |
|
End Preparation |
Beveled Ends |
|
Surface Finish |
Pickled, blasted or polished |
|
Inspection |
Dimensional, visual, material and specified NDT |
|
Documentation |
Material certificate and inspection records |
Material Selection
304L Stainless Steel
A low-carbon stainless steel grade commonly specified for welded process piping and general corrosive service.
316L Stainless Steel
Selected for applications where improved resistance to chloride-containing or corrosive media is required by the material specification.
321 Stainless Steel
A stabilized stainless steel grade used where elevated-temperature service and resistance to sensitization are considered in the piping specification.
904L and Duplex Stainless Steel
Used for applications with specific corrosion-resistance or mechanical-property requirements defined by the engineering specification.
Size and Geometry Control
Outside Diameter
The elbow OD is matched to the connected pipe dimension to support accurate pipe alignment and weld fit-up.
Wall Thickness
Wall thickness is checked against the specified nominal thickness and permitted tolerance at defined inspection points.
Bend Radius
The 5D centerline radius is a primary dimensional requirement. Radius and elbow angle are checked after forming.
Ovality
Cross-sectional geometry is inspected to maintain the required pipe connection profile.
End Preparation
End diameter, squareness, bevel geometry, and root-face dimensions are checked before final inspection.
Manufacturing Process
Material Identification
Material grade and heat number are recorded before processing to maintain material traceability through production.
Forming
The stainless steel section is formed to the specified angle and 5D centerline radius. Forming parameters are controlled according to material grade and section dimensions.
Welding
Fabricated sections are welded according to the specified welding procedure. Weld areas receive the inspection required by the applicable specification.
Finishing
The fitting is trimmed, beveled, cleaned, and finished according to the specified surface and end condition.
Inspection and Documentation
Dimensional Inspection
Inspection covers OD, wall thickness, centerline radius, angle, tangent dimensions, ovality, and end preparation.
Material Verification
Material identification is checked against the heat number and material certificate.
Nondestructive Testing
RT, UT, PT, or other specified NDT methods can be applied according to the applicable standard or project inspection plan.
Quality Records
Available documentation can include material certificates, dimensional inspection records, NDT reports, and other specified inspection records.
Application Suitability
Process Piping
The 5D geometry suits large process lines where a long-radius directional transition is specified.
Chemical Processing
Material grade can be selected according to the process medium, operating temperature, and corrosion conditions.
Oil and Gas Piping
Large-diameter 5D elbows can be specified for process and transmission systems requiring long-radius directional changes.
Power and Industrial Piping
Suitable for large stainless steel piping used for process fluids, utilities, and industrial services where the required material and dimensional specifications are defined.
Specification Review Before Ordering
Pipe Size
Provide DN or NPS, outside diameter, and wall thickness.
Material Grade
Specify the required stainless steel grade, material standard, and heat-treatment requirements where applicable.
Geometry
Confirm 45°, 90°, or 180° angle, 5D radius, tangent length, end dimensions, and bevel preparation.
Inspection
Specify required NDT methods, dimensional tolerances, material certification, marking, and inspection records.
Quantity
Provide the required quantity together with project-specific packing, identification, or documentation requirements.
FAQ
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