This reference page provides dimensional and drafting information for a Weld Neck Flange 2 Inch Class 1500. Use the listed values to coordinate piping layouts, flange details, fabrication drawings, and CAD work while keeping the flange, pipe, gasket, and bolting requirements aligned.
The source data identifies the flange by both NPS and DN designation and includes the principal outside, thickness, hub, raised-face, bolt, hole, and weight information. The bore is treated separately because it depends on the connected pipe schedule and wall thickness.
Weld Neck Flange 2″ Class 1500
Weld Neck Flange 2″ Class 1500 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 2″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):2″
- DN Size: DN50
- Outside Diameter:216mm
- Flange Thickness:38.1mm
- Hub Diameter:105mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:92.1mm
- Weight: 10.1kg
- Number of Bolts:8
- Stud Bolt Size: 7/8″ UNC (or M24) x 145 Long
- Hole Diameter: 1″ (25.4mm)
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 1500 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 1500, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 1500 Sizes
This size is part of the Weld Neck Flange Class 1500 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
A weld neck flange is welded directly to the pipe through its tapered hub. For drafting purposes, the hub and flange face should be shown as one coordinated connection rather than as an independent loose flange. The tapered transition is an important part of the component geometry and helps explain why weld neck flanges are selected for demanding piping service.
Dimension and identification checks
- NPS and DN: NPS 2 and DN50 identify the nominal pipe size using two common designation systems. These labels should be checked against the project line list, piping specification, and connected component schedule.
- Outside diameter and thickness: These dimensions define the primary flange envelope for layout, clearance review, and detail drawings. Confirm that adjoining flanges and equipment nozzles use the same nominal class and facing arrangement.
- Bore diameter: The bore is not a universal value for every connected pipe. Select or verify it against the pipe schedule and wall thickness before fabrication, because the bore must suit the actual pipe and welding detail.
- Raised face: The raised-face dimension should be coordinated with the gasket seating area and the mating flange. Do not use the flange outside diameter as a substitute for the facing dimension.
- Bolting: The listed bolt count, stud size, length, and hole diameter are useful for connection detailing. Final bolting must still be checked against the mating flange, gasket, material specification, and project requirements.
- Weight: The listed weight can support handling, shipping, and preliminary support reviews. It should not be treated as a complete installed assembly weight.
Useful related references
For a complete piping detail, pair this page with references for pipe schedules, flange facing types, stud bolts and nuts, gasket selection, and piping isometric drawings. These related topics help explain why the flange bore, gasket contact, bolt arrangement, and connected pipe must be reviewed together.
CAD and fabrication workflow
The downloadable DWG can be used as a starting point for drafting and layout coordination. Before issuing a drawing, verify units, layer conventions, insertion scale, flange orientation, weld details, and the relationship between the flange face and the pipe centerline. CAD geometry is a reference aid; it does not replace a project-approved fabrication drawing or a verified piping specification.
For installation or fabrication, confirm the applicable standard, material, pipe schedule, bore, gasket, bolt assembly, and pressure-temperature requirements. The source identifies ANSI / ASME B16.5 as the dimensional reference, but project documents should control where they impose additional requirements.
Frequently Asked Questions
What does NPS 2 mean on this flange?
NPS 2 is the nominal pipe size designation used to identify the connected piping size. The same source also identifies the flange as DN50.
Why does the bore vary?
The bore depends on the pipe schedule and wall thickness selected for the connected pipe. Verify the bore against the actual pipe specification before ordering or fabrication.
What is the purpose of the tapered hub?
The tapered hub provides the transition from the pipe to the flange and helps distribute stress through the welded connection. It is a defining feature of a weld neck flange.
Can the listed bolt information be used for every connection?
The listed bolt details apply to the reference data on this page. Confirm compatibility with the mating flange, gasket, material requirements, tightening procedure, and project specification before installation.
What can the DWG file be used for?
The DWG may support drafting, piping layout coordination, detailing, and fabrication reference. Check its units and geometry against the approved project documentation before using it for production.
Does the listed weight include the complete piping connection?
No. The listed weight refers to the flange reference item. Pipe, gasket, studs, nuts, weld metal, and attached components must be considered separately when evaluating the complete assembly.