This reference page provides the dimensional and bolting information for a 24-inch Class 400 blind flange, along with practical guidance for interpreting the listing. Use the source data for drafting, flange selection, procurement review, and piping coordination, then verify the final component against the project specification.
A blind flange has no center bore, so it closes a flanged piping end, equipment nozzle, or other connection. Its removable bolted connection can support maintenance isolation, inspection access, or a future connection point without permanently modifying the piping assembly.
Blind Flange 24″ Class 400
Blind Flange 24″ 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 24″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 24″
- DN Size: DN600
- Flange Thickness: 76.2mm
- Weight: 405kg
- Stud Bolt Size: 1 3/4″ UNC (or M45) x 265 Long
- Number of Bolts: 24
- Hole Diameter: 1 7/8″ (47.625mm)
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 24″ 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 24″ 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 dimensions section identifies the nominal pipe size, metric size designation, flange thickness, listed weight, stud bolt details, bolt count, and hole diameter. These values are useful when checking a general arrangement, coordinating a piping model, or comparing a flange detail with a matching mating flange and gasket arrangement.
The listed bolt information should be read together with the flange hole information and the project bolting specification. Confirm thread form, material, bolt or stud length, washers, tightening requirements, and any controlled bolting procedure before installation. The listed alternative metric designation should also be checked against the purchasing and fabrication requirements rather than assumed to be interchangeable in every application.
Class Rating and Project Verification
The Class 400 designation identifies the flange class used for the reference. It should not be treated as a standalone allowable operating pressure. Final suitability depends on the applicable pressure-temperature requirements, material specification, gasket selection, facing details, connected equipment, and project design conditions.
Drafting and CAD Coordination
The available DWG file can help with preliminary layout, detailing, and coordination. Before issuing a drawing for fabrication or construction, compare the file with the dimension list and confirm the mating flange, gasket, bolt circle arrangement, clearances, and orientation required by the project.
Related Reference Topics
- Use the blind flange category to compare other nominal sizes in the same class.
- Cross-check related flange dimensions when selecting a mating flange or gasket.
- Review piping terminology resources for explanations of NPS, DN, flange class, and bolting terms.
- Use the CAD and DWG reference section for additional drafting resources.
Frequently Asked Questions
What is a 24-inch Class 400 blind flange used for?
It is used to close a flanged piping end, vessel or equipment connection, valve connection, or future branch point. Typical uses include isolation, maintenance shutdown work, nozzle blanking, and planned system expansion.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. It seals the connection by closing the opening at the flanged joint.
What information is provided for the bolt connection?
The source listing provides the stud bolt size and length, number of bolts, and hole diameter. Confirm the complete bolting and tightening requirements with the project specification before installation.
Can the DWG file be used directly for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. It should be checked against the source dimensions, project requirements, mating components, and approved fabrication documents before release.
Does Class 400 by itself determine the allowable pressure?
No. The applicable pressure-temperature rating must be confirmed using the relevant standard, material, temperature, gasket, flange facing, and project design requirements.