This reference page brings together the dimensional data, bolt information, weight, and CAD resource for a Weld Neck Flange 6 Inch Class 150. Use the listed values for drafting and coordination, then verify the final selection against the project specification and applicable piping requirements.
The flange dimensions should be read together with the connected pipe’s schedule, wall thickness, facing arrangement, gasket selection, and material requirements. Related PipeSTD references for pipe schedules, flange dimensions, piping terminology, and CAD/DWG resources can help complete the surrounding design check.
Weld Neck Flange 6″ Class 150
Weld Neck Flange 6″ 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 6″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):6″
- DN Size: DN150
- Outside Diameter:279mm
- Flange Thickness:23.9mm
- Hub Diameter:192mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:215.7mm
- Weight: 11.8kg
- Number of Bolts:8
- Stud Bolt Size: 3/4″ UNC (or M20) x 100 Long
- Hole Diameter: 7/8″ (22.225mm)
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 6″ 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 6″ 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 Read This Flange Reference
A weld neck flange has a tapered hub that transitions into the pipe. The hub is intended to support a butt-welded connection and provides a gradual change in section compared with flange styles that use a shorter hub. The weld preparation, pipe end condition, material compatibility, and welding procedure still require separate engineering and fabrication review.
Key Dimensions and Their Uses
- Outside diameter and thickness: These control the flange envelope and are important when checking clearances, mating components, and drawing details.
- Hub diameter: This identifies the external hub geometry. It should not be treated as the pipe bore or as a substitute for checking the weld-end detail.
- Bore diameter: The bore is dependent on the connected pipe schedule and wall thickness. Confirm it before preparing fabrication drawings or ordering a machined flange.
- Raised face diameter: This identifies the facing area that interfaces with the gasket and mating flange. The complete joint check must also consider gasket and facing requirements.
- Bolt information: Bolt count, hole diameter, bolt size, and bolt length must be coordinated with the mating flange, gasket thickness, washers, and project bolting specification.
Drafting and Installation Checks
When using the downloadable DWG, confirm the drawing units, centerline alignment, bore selection, weld-end geometry, and facing details before incorporating the file into a project model. A CAD outline is a reference aid; it does not replace dimensional verification, material review, or pressure-temperature assessment.
The Class 150 designation identifies the flange class series, but it should not be treated as a standalone allowable pressure. The applicable rating depends on factors such as material, temperature, joint configuration, and the governing project requirements. For a complete connection review, compare this page with the relevant pipe schedule reference and the mating flange data.
Frequently Asked Questions
What does the bore diameter depend on?
The bore depends on the connected pipe schedule and wall thickness. Select or verify the bore using the actual pipe specification rather than assuming that nominal pipe size alone defines it.
Is a weld neck flange welded directly to the pipe?
Yes. A weld neck flange is designed for a butt-welded pipe connection through its tapered hub. The actual weld detail and procedure must be established from the pipe material, flange material, fabrication code, and project requirements.
Can the listed stud bolt options be treated as interchangeable?
The source lists an imperial UNC option and a metric option. Confirm the project’s bolting system, thread requirements, length, washers, nuts, and mating-flange compatibility before procurement or installation.
Does Class 150 alone establish the allowable operating pressure?
No. The class designation is part of the flange rating system, but the allowable rating must be checked against material, temperature, gasket and joint conditions, and the governing design requirements.
What should be checked before using the DWG file?
Check units, scale, bore selection, face details, bolt-hole pattern, pipe centerline, and weld-end geometry. The drawing should be coordinated with the project’s approved dimensional and fabrication requirements.