This reference provides the dimensional details, bolt information, weight, and CAD resource for a Weld Neck Flange 6 Inch Class 1500. Use the listed values for drafting and component identification, then confirm the flange configuration against the project specification before fabrication or installation.
The page is especially useful when coordinating flange layouts with pipe schedules, gaskets, stud bolts, and related piping components. The bore is not a single universal value because it depends on the connected pipe schedule and wall thickness.
Weld Neck Flange 6″ Class 1500
Weld Neck Flange 6″ 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 6″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):6″
- DN Size: DN150
- Outside Diameter:394mm
- Flange Thickness:82.6mm
- Hub Diameter:229mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:215.9mm
- Weight: 75kg
- Number of Bolts:12
- Stud Bolt Size: 1 3/8″ UNC (or M36) x 260 Long
- Hole Diameter: 1 1/2″ (38.1mm)
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 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 6″ 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 Read This Flange Reference
The dimensional list identifies the flange envelope, connection pattern, and basic installation details. Outside diameter and thickness describe the main flange body, while the hub diameter relates to the tapered weld-neck section. The raised face diameter identifies the sealing-face area that interfaces with the gasket and mating flange.
NPS, DN, and Bore Selection
NPS identifies the nominal pipe size used in the flange designation, while DN is the corresponding metric nominal designation shown in the reference. These labels do not by themselves define the actual internal opening. For fabrication and checking, match the bore to the connected pipe schedule and wall thickness rather than assuming that every pipe in the nominal size has the same bore.
Bolting and Joint Coordination
The bolt count, stud bolt designation, bolt length, and hole diameter should be reviewed together. Confirm that the selected studs, nuts, washers where specified, gasket, and mating flange are compatible with the joint arrangement. Bolt length can also depend on the complete joint stack-up, so the listed value should be checked against the project assembly requirements.
Using the CAD File
The downloadable DWG can support preliminary layout, drafting, detailing, and coordination. Before using it for fabrication, compare the drawing geometry with the dimensional reference, the selected bore, the mating component, and the applicable project requirements. CAD geometry should be treated as a drafting aid, not as a substitute for specification review or engineering approval.
Related Reference Topics
For a complete piping check, connect this reference with related pages covering flange dimensions, pipe schedules, raised-face flanges, stud bolt sizing, gasket selection, and DWG piping details. These topics help users move from a nominal flange designation to a coordinated connection assembly.
Frequently Asked Questions
What does the Class 1500 designation identify?
It identifies the flange class used in the component designation. The applicable pressure-temperature limits and material requirements must still be confirmed from the governing specification and project documentation.
Is the bore diameter fixed for this flange?
No. The reference states that the bore varies with pipe schedule and pipe wall thickness. Select and verify the bore against the actual connected pipe.
What type of flange is shown on this page?
This is a weld neck flange with a long tapered hub intended to be welded directly to the pipe. Its geometry supports a gradual transition between the pipe and flange, but the complete connection still requires review of welding, materials, gasket, and bolting requirements.
Can the listed stud bolt information be used without checking the mating flange?
No. Check the stud designation, length, hole diameter, gasket, mating flange, and joint stack-up together before ordering or installation.
What is the DWG file useful for?
The DWG file is useful for drafting, piping layout coordination, detailing, and fabrication reference. Verify its geometry and the selected bore against the authoritative dimensional data and project requirements before release.
Should the flange be fabricated directly from this page?
Use the page as a reference, but confirm the material specification, pipe schedule, bore, gasket type, bolt length, and pressure-temperature requirements before fabrication or installation.