This reference page provides dimensional and drafting information for a Weld Neck Flange 10 Inch Class 2500. Use the source data for initial layout, model coordination, and fabrication review, then verify the final selection against the project specification and applicable piping requirements.
The page is especially useful when checking flange geometry alongside pipe schedules, gasket selection, bolting, and connection details. The downloadable DWG can support CAD coordination, but it should be reviewed against the approved design before fabrication.
Weld Neck Flange 10″ Class 2500
Weld Neck Flange 10″ 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 10″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):10″
- DN Size: DN250
- Outside Diameter:673mm
- Flange Thickness:165.1mm
- Hub Diameter:375mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:323.8mm
- Weight: 470kg
- Number of Bolts:12
- Stud Bolt Size: 2 1/2″ UNC (or M64) x 490 Long
- Hole Diameter: 2 5/8″ (66.675mm)
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 10″ 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 10″ 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 Weld Neck Flange Reference
The listed outside diameter, thickness, hub dimensions, raised-face dimension, bolt-hole information, and weight describe the flange reference geometry. These fields are useful for piping layout, clearance checks, bill-of-materials preparation, and preliminary weight coordination.
Reference fields at a glance
- Nominal size: Identifies the pipe connection size used for piping-system coordination.
- Class designation: Identifies the flange pressure-class series; it should be checked with the applicable pressure-temperature requirements rather than treated as a standalone allowable pressure.
- Bore: Must be matched to the connected pipe schedule and wall thickness. Do not assume that the flange bore is interchangeable with every pipe configuration of the same nominal size.
- Facing and bolting: The raised face, bolt count, hole diameter, stud size, and stud length must be coordinated with the mating flange, gasket, washers, and tightening procedure.
- Weight: Include the listed flange weight in handling, support, and piping-load reviews where applicable.
Weld neck design considerations
The tapered hub transitions the flange into the pipe and is intended to provide a gradual load path at the welded connection. Installation still depends on correct alignment, weld preparation, welding procedure, inspection requirements, and material compatibility. These details are governed by the project documents and applicable fabrication requirements.
For drafting work, confirm the flange face orientation, pipe centerline, bolt-hole rotation, mating-flange arrangement, and available maintenance clearance. When using the DWG file, treat it as a coordination reference and confirm that the selected bore, gasket arrangement, and bolting match the approved design.
Related reference topics
For a complete piping check, pair this page with references for pipe schedules, flange dimensions, gaskets and bolting, piping terminology, and CAD/DWG resources. These related topics help connect nominal pipe size, actual pipe wall, flange bore, and installation requirements.
Frequently Asked Questions
What does the Class 2500 designation mean?
It identifies the flange pressure-class series. The applicable pressure-temperature capability must still be confirmed using the governing standard, material requirements, and project design conditions.
Does the flange bore vary with pipe schedule?
Yes. The source data identifies the bore as dependent on the connected pipe schedule and wall thickness. Confirm the required bore before ordering or fabricating.
Can this flange be used with any mating flange?
No. Confirm the mating flange type, facing, bolt-hole arrangement, gasket, material, and applicable rating before assembly.
What is the DWG file useful for?
The DWG can support drafting, piping-layout coordination, detailing, and fabrication reference. It should not replace the approved dimensional review or project-specific design documents.
Should the listed weight be used for final structural design?
Use it as a reference for handling and preliminary piping-load coordination. Final support and structural decisions require review of the complete assembled connection and project loading conditions.
What should be checked before installation?
Verify the flange dimensions, pipe schedule and bore, gasket, bolt and stud details, material specification, alignment, weld requirements, and pressure-temperature conditions before installation.