This reference provides the dimensional and drafting information for a Weld Neck Flange 24 Inch Class 900. Use the listed values to coordinate flange details with piping layouts, fabrication drawings, and related flange components.
For accurate selection, compare the flange dimensions with the connected pipe, bore requirement, gasket arrangement, bolting, material specification, and project pressure-temperature requirements. The CAD file can support preliminary detailing, but final fabrication and installation information should be checked against the approved project documents.
Weld Neck Flange 24″ Class 900
Weld Neck Flange 24″ Class 900 is widely used in piping systems that require strong, leak-resistant flange connections under high-pressure service. It features a long tapered hub that provides excellent stress distribution and is commonly applied in process piping, utility lines, refineries, power plants, and industrial systems where welding strength and reliability are essential.
This dimension data is based on ANSI / ASME B16.5-2020.
Weld Neck Flange 24″ Class 900 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):24″
- DN Size: DN600
- Outside Diameter:1041mm
- Flange Thickness:139.7mm
- Hub Diameter:749mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:692.2mm
- Weight: 875kg
- Number of Bolts:20
- Stud Bolt Size: 2 1/2″ UNC (or M64) x 440 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 24″ Class 900 is commonly used for:
- Process piping systems
- Oil and gas lines
- Refinery and petrochemical piping
- Very 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 24″ Class 900, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 900 Sizes
This size is part of the Weld Neck Flange Class 900 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 Read This Flange Reference
The dimension list identifies the primary geometry of the flange, including its outside diameter, thickness, hub diameter, raised face diameter, bolt-hole information, and stud-bolt details. These values help drafters establish the flange envelope and coordinate bolt-circle space with adjacent piping and equipment.
NPS, DN, and Bore
NPS and DN are nominal size designations rather than direct substitutes for every measured flange feature. The listed bore is not a single universal value because it depends on the connected pipe schedule and wall thickness. Confirm the required bore before releasing a fabrication drawing or selecting a matching flange.
Why the Weld Neck Hub Matters
The long tapered hub transitions from the flange body toward the pipe and is intended to provide a gradual load path at the welded connection. This geometry is particularly relevant when reviewing pressure service, temperature changes, cyclic loading, and the quality of the weld and surrounding fabrication details.
Using the CAD File
The downloadable DWG is useful for layout coordination, flange orientation, detailing, and fabrication reference. Treat the drawing as a dimensional aid rather than a substitute for checking the pipe schedule, flange material, facing and gasket arrangement, bolting, welding requirements, and the governing project specification.
Coordination Checklist
- Confirm the connected pipe size, schedule, and required bore.
- Check the flange face arrangement and gasket compatibility.
- Verify bolt-hole alignment, stud-bolt selection, and available wrench clearance.
- Review material, pressure-temperature requirements, and fabrication documentation.
- Compare the CAD geometry with the approved piping and equipment drawings.
For broader coordination, link this reference with related PipeSTD resources covering pipe schedules, flange types, gaskets, stud bolts, and piping CAD details.
Frequently Asked Questions
What is a Weld Neck Flange?
A weld neck flange has a tapered hub and is welded directly to the pipe. The hub supports a gradual transition between the pipe and flange and helps address stress concentration at the connection.
Why can the bore vary for this flange?
The bore must match the connected pipe condition. As noted in the reference data, the required bore varies with pipe schedule and wall thickness, so it should be confirmed before ordering or fabrication.
Can the listed dimensions be used directly for fabrication?
They are useful for reference and drafting, but fabrication should also account for the approved material specification, pipe details, gasket, bolting, welding requirements, and project documentation.
What is the DWG file used for?
The DWG can support piping layout coordination, detailing, and fabrication reference. Verify the drawing against the approved design before using it for final production.
What should be checked when matching this flange to another component?
Check nominal size, flange class, face arrangement, bolt-hole pattern, bore, material, gasket compatibility, and the applicable project requirements. Matching one dimension alone does not confirm compatibility.