This reference covers the dimensional data, connection details, and CAD resource for a Weld Neck Flange 2 Inch Class 2500. Use the listed values for drafting and preliminary coordination, then verify the flange, pipe, gasket, bolting, and material requirements against the project specification before fabrication or installation.
The flange data is especially useful when coordinating pipe schedules, flange dimensions, stud bolts, and piping CAD drawings. The bore should not be treated as a universal value because it depends on the connected pipe wall thickness and schedule.
Weld Neck Flange 2″ Class 2500
Weld Neck Flange 2″ Class 2500 is widely used in piping systems that require strong, leak-resistant flange connections under extremely high-pressure service. It features a long tapered hub that provides excellent stress distribution and is commonly applied in refineries, petrochemical plants, power generation systems, and critical industrial piping where welding strength and connection reliability are essential.
This dimension data is based on ANSI / ASME B16.5-2020.
Weld Neck Flange 2″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):2″
- DN Size: DN50
- Outside Diameter:235mm
- Flange Thickness:50.8mm
- Hub Diameter:95mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:92.1mm
- Weight: 18kg
- Number of Bolts:8
- Stud Bolt Size: 1″ UNC (or M27) x 180 Long
- Hole Diameter: 1 1/8″ (28.575mm)
What Is a Weld Neck Flange?
A weld neck flange is a type of pipe flange designed with a long tapered hub that is welded directly to the pipe. This design helps reduce stress concentration at the flange base and provides better strength under pressure, temperature fluctuation, and cyclic loading.
Common Applications
Weld Neck Flange 2″ Class 2500 is commonly used for:
- Process piping systems
- Oil and gas lines
- Refinery and petrochemical piping
- Extremely high-pressure service
- Pressure piping connections
- Industrial fabrication and maintenance work
CAD Drawing Download
This page includes the CAD drawing file for Weld Neck Flange 2″ Class 2500, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 2500 Sizes
This size is part of the Weld Neck Flange Class 2500 series. Check other sizes in the same category to find matching dimension data and CAD files for your project.
Notes
Before fabrication or installation, always confirm the latest project requirements, flange material specification, pipe schedule, bore size, gasket type, bolt length, and applicable pressure-temperature rating.
How to Use This Flange Reference
The existing dimension list identifies the flange envelope, hub, face, bolt arrangement, hole size, weight, and stud bolt information. These details support piping layout, flange-mating checks, fabrication detailing, and CAD coordination. For related work, compare this page with the applicable pipe schedule reference and other flange and fitting dimensions so the connected components are reviewed as a complete assembly.
Why the Bore Requires Pipe Schedule Verification
The outside flange dimensions can be referenced independently of the connected pipe bore, but the opening through the flange must match the pipe connection being detailed. Since pipe wall thickness varies by schedule, the bore value should be confirmed from the selected pipe data rather than assumed from the nominal pipe size alone.
Why the Weld Neck Design Matters
A weld neck flange uses a tapered hub and a direct weld connection to the pipe. This arrangement is intended to provide a gradual transition between the pipe and flange and to support reliable load transfer in demanding piping service. Proper welding, alignment, inspection, gasket selection, and bolting remain essential to the performance of the completed joint.
Drafting and CAD Coordination Checklist
- Confirm the nominal pipe size and connected pipe schedule.
- Check the flange face and bolt-hole arrangement against the mating flange.
- Verify stud bolt length, thread form, material, and project requirements.
- Coordinate the flange bore with the actual pipe wall thickness.
- Use the downloadable DWG as a drafting reference, not as a substitute for approved fabrication documents.
- Review the applicable pressure-temperature requirements and material specification before release.
Frequently Asked Questions
What information is provided for this weld neck flange?
The reference provides the flange dimensions, hub and raised-face information, weight, bolt count, stud bolt size, hole diameter, nominal size, and DN designation, along with a CAD download.
Why is the bore listed as variable?
The bore depends on the selected pipe schedule and pipe wall thickness. Confirm it from the connected pipe specification before completing a fabrication or layout drawing.
Can the DWG file be used for fabrication?
The DWG is useful for drafting, detailing, layout coordination, and fabrication reference. Final fabrication should still follow the approved project documents and verified material, welding, gasket, bolting, and dimensional requirements.
What should be checked before installation?
Confirm the mating flange, flange material, pipe schedule, bore, gasket type, bolt details, alignment, and applicable pressure-temperature requirements. These checks help ensure that the complete flange joint—not only the flange dimensions—is suitable for the intended service.