This reference provides the dimensional and fastening information for a blind flange sized for NPS 10, also identified as DN250, in Class 400 service. Use the source data below when checking piping layouts, flange details, fabrication drawings, and procurement requirements.
A blind flange has a solid face rather than a central pipe opening. That makes it useful for closing a flange connection while retaining the option to remove the flange for inspection, maintenance, equipment isolation, or future line work. The listed dimensions should be coordinated with the mating flange, gasket, bolts, facing, and project specifications.
Blind Flange 10″ Class 400
Blind Flange 10″ Class 400 is used to seal the end of a piping system or close off a flange connection in Class 400 service. It is a solid flange without a center bore and is commonly used in industrial piping systems, maintenance isolation points, and future pipeline expansion connections where a higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 10″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 10″
- DN Size: DN250
- Flange Thickness: 53.8mm
- Weight: 71kg
- Stud Bolt Size: 1 1/8″ UNC (or M30) x 190 Long
- Number of Bolts: 16
- Hole Diameter: 1 1/4″ (31.75mm)
What Is a Blind Flange?
A blind flange is a blank flange used to close the end of a pipeline, vessel nozzle, or equipment connection. It provides a secure shutoff point and is often selected when future maintenance, inspection, or line extension may be required.
Common Applications
Blind Flange 10″ Class 400 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 10″ Class 400, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 400 Sizes
This size is part of the Blind Flange Class 400 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, gasket type, bolt length, and applicable pressure-temperature rating.
How to Use This Blind Flange Reference
The dimension list identifies the nominal size, flange thickness, weight, stud bolt designation, bolt quantity, and hole diameter. These details support drafting and layout coordination, but they should not be treated as a substitute for checking the complete piping specification or the applicable pressure-temperature requirements.
Understanding the Fastening Information
The stud bolt entry describes the threaded fastening designation and bolt length. The number of bolts identifies the required bolt-hole pattern, while the hole diameter describes the clearance opening through the flange. Confirm that the selected studs, nuts, washers, and tightening procedure are compatible with the project specification and the mating flange.
Design and Installation Checks
- Verify the flange class and nominal pipe size against the piping line list and equipment connection.
- Check the mating flange facing and gasket selection before fabrication or installation.
- Confirm material requirements, bolting details, and pressure-temperature conditions with the approved project documents.
- Use the CAD/DWG file for drafting and coordination, then verify critical fabrication dimensions against the governing reference data.
- For temporary isolation or commissioning work, follow the applicable safety, depressurization, and inspection procedures.
Related Reference Topics
This page can be linked with the site’s related references for flange dimensions, pipe schedules, gasket selection, stud bolt specifications, piping terminology, and other blind flange Class 400 sizes. Those connections help readers compare flange details without confusing nominal pipe size with the physical dimensions of the flange or pipe.
FAQ
What is a blind flange used for?
A blind flange closes the end of a pipe, vessel nozzle, valve connection, or other flanged opening. It can provide an isolation point and can be removed when access, inspection, maintenance, or future extension is required.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a central pipe opening. It still includes the bolt-hole pattern needed to connect it to a mating flange.
What information is provided for this 10 inch Class 400 flange?
The reference includes the nominal and DN size, flange thickness, weight, stud bolt designation and length, bolt quantity, hole diameter, governing reference standard, and a CAD drawing download.
Can the listed bolt size be used for every installation?
Use the listed bolt information as a reference for this flange entry, then confirm the final bolting arrangement against the mating flange, gasket system, material specification, assembly procedure, and project requirements.
Is the CAD drawing sufficient for fabrication?
The CAD file is intended to support drafting, detailing, and piping layout coordination. Before fabrication, verify the drawing against the approved technical specification and the source dimension data on this page.