This reference page provides dimension data and a CAD resource for a Weld Neck Flange 10 Inch Class 150. Use the listed values when checking flange layouts, preparing piping drawings, or coordinating a flange connection with the matching pipe, gasket, and bolting.
The most important selection detail is the bore. Unlike the outside flange dimensions, the bore depends on the pipe schedule and wall thickness selected for the piping system. Confirm that detail before using the flange in a fabrication drawing or material takeoff.
Weld Neck Flange 10″ Class 150
Weld Neck Flange 10″ Class 150 is widely used in piping systems that require strong, leak-resistant flange connections. It features a long tapered hub that provides excellent stress distribution and is commonly applied in process piping, utility lines, and industrial systems where welding strength and reliability are important.
This dimension data is based on ANSI / ASME B16.5-2020.
Weld Neck Flange 10″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):10″
- DN Size: DN250
- Outside Diameter:406mm
- Flange Thickness:28.4mm
- Hub Diameter:305mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:323.8mm
- Weight: 32kg
- Number of Bolts:12
- Stud Bolt Size: 7/8″ UNC (or M24) x 115 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 10″ Class 150 is commonly used for:
- Process piping systems
- Oil and gas lines
- Water and utility piping
- High-temperature 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 150, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 150 Sizes
This size is part of the Weld Neck Flange Class 150 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 aligned with the pipe and joined through its tapered hub. The hub provides a gradual transition between the pipe and flange, which is why this flange type is commonly considered when connection strength, alignment, and resistance to service-related loading matter.
Check the Connection as a Complete Assembly
Flange dimensions should not be reviewed in isolation. Confirm the mating flange, gasket arrangement, bolt pattern, stud bolt specification, pipe schedule, and weld details together. The flange face and gasket selection must also be compatible with the adjoining equipment or piping component.
- Flange outside dimensions: Use the listed outside diameter, thickness, hub diameter, and raised face diameter for layout and detailing checks.
- Pipe interface: Verify the bore against the selected pipe schedule and wall thickness rather than assuming one universal opening.
- Bolting: Check the listed bolt count, stud bolt size, bolt-hole diameter, washer arrangement, and required engagement against the project specification.
- Weight: Treat the listed weight as a reference for handling and material planning; confirm the final assembly weight when gasket, bolts, and attached piping are included.
Drafting and CAD Coordination
The downloadable DWG can support piping layout, equipment-interface coordination, flange detailing, and fabrication reference. Before issuing a drawing, compare the CAD geometry with the dimension list and confirm the pipe bore, facing arrangement, and mating-component requirements.
For related design work, connect this reference with internal resources covering pipe schedules, flange types, raised-face flanges, stud bolt dimensions, gasket selection, and piping isometric drafting. These topics help readers move from an individual flange dimension check to a complete piping connection review.
Important Verification Point
The listed standard reference and project notes should be checked against the governing procurement specification and the applicable pressure-temperature requirements. Material grade, corrosion allowance, service conditions, welding requirements, and installation practices may affect the final selection and must be confirmed by the responsible engineering team.
Frequently Asked Questions
What does a weld neck flange do?
A weld neck flange connects to the pipe through its tapered hub and butt-welded joint. Its geometry provides a gradual transition from the pipe into the flange, supporting a robust connection when correctly selected and installed.
Why does the bore vary for this flange?
The bore is matched to the pipe inside diameter, which changes with pipe schedule and wall thickness. Always select or verify the bore using the actual pipe specification.
What bolt information is provided?
The reference lists the bolt quantity, stud bolt size, nominal length, and hole diameter. Confirm the complete bolting arrangement, including material, washers, tightening requirements, and project-specific requirements, before installation.
Can the DWG be used for fabrication?
The DWG is useful for drafting, layout coordination, and fabrication reference. It should be checked against the listed dimensions, the selected pipe bore, mating flange, gasket, and the approved project drawings before fabrication.
Is the listed weight the complete connection weight?
No. The listed flange weight is a component reference. A complete connection may also include bolts, gasket, pipe, weld metal, and other attached items.