This reference provides the listed dimensions, bolt information, weight, and CAD resource for a 16 inch Class 150 weld neck flange. Use the dimensional data for drafting and coordination, while treating the project specification and applicable standard requirements as the final authority for fabrication and installation.
The flange’s tapered hub is welded directly to the pipe and is intended to provide a gradual transition between the pipe and flange. When reviewing the data, pay particular attention to the bore, because the bore must correspond with the pipe schedule and wall thickness rather than being selected from the flange size alone.
Weld Neck Flange 16″ Class 150
Weld Neck Flange 16″ 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 16″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):16″
- DN Size: DN400
- Outside Diameter:597mm
- Flange Thickness:35.1mm
- Hub Diameter:457mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:469.9mm
- Weight: 82kg
- Number of Bolts:16
- Stud Bolt Size: 1″ UNC (or M27) x 135 Long
- Hole Diameter: 1 1/8″ (28.575mm)
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 16″ 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 16″ 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 These Weld Neck Flange Dimensions
The listed outside diameter, flange thickness, hub diameter, raised face diameter, bolt-hole information, and weight describe the flange geometry and reference details for this nominal size and pressure class. They are useful for piping layouts, fabrication drawings, material takeoffs, and checking clearances around the bolted connection.
The bore is identified separately because a weld neck flange may be bored to suit the connected pipe. Confirm the pipe outside diameter, schedule, wall thickness, welding requirements, and any machining allowance before releasing a drawing or purchase order. A flange that matches the nominal pipe size can still require a different bore configuration.
Bolting and Connection Review
Use the listed bolt count, stud bolt designation, bolt length, and hole diameter together when preparing a flange connection. Bolt length should be checked against the flange thickness, gasket arrangement, washer use, nut engagement, and any project-specific bolting practice. Do not assume that a nominal bolt designation alone confirms the complete installed assembly.
For additional coordination, connect this page with the site’s pipe schedule reference, pipe dimensions guide, flange types reference, and gasket and bolting terminology guide. These related references help readers compare the flange bore with the pipe and understand the components shown in a piping or fabrication drawing.
CAD and Drawing Coordination
The downloadable DWG can support piping layout, detailing, and preliminary fabrication reference. Before using it as a fabrication document, verify units, drawing scale, face orientation, bore configuration, bolt-hole layout, and the project’s material and connection requirements. CAD geometry should be checked against the applicable dimensional data and the purchase specification.
Engineering and Procurement Checks
- Confirm the flange material and applicable material specification.
- Match the bore to the actual pipe schedule and wall thickness.
- Verify gasket type, facing details, and bolting requirements.
- Check the required pressure-temperature service conditions.
- Review the latest project documents before fabrication or installation.
Frequently Asked Questions
What is the key feature of a weld neck flange?
A weld neck flange has a long tapered hub that is welded directly to the pipe. The transition is intended to reduce stress concentration compared with less tapered flange arrangements and is commonly considered where welding strength and cyclic service are important.
Does the flange bore remain the same for every pipe schedule?
No. The source data identifies the bore as dependent on the pipe schedule and wall thickness. Confirm the connected pipe dimensions before selecting or machining the flange bore.
What bolt information is provided for this flange?
The reference lists the number of bolts, the stud bolt designation and length, and the hole diameter. These details should be reviewed together with the gasket, washers, nuts, flange thickness, and project bolting requirements.
Can the DWG be used directly for fabrication?
The DWG is provided as a drafting, detailing, layout-coordination, and fabrication-reference resource. It should be checked against the applicable standard, project specification, material requirements, bore selection, and approved fabrication documents before use.
Why should the listed weight be treated as a reference value?
Flange weight can depend on the flange configuration, bore, facing, material, and manufacturing details. Use the listed value for reference and confirm the final supplied component with the manufacturer or approved procurement documentation.