This reference provides the reported dimensions, weight, fastening information, and CAD resource for a Blind Flange 1/2 Inch Class 900. Use the data below when preparing piping layouts, flange connection details, equipment isolation arrangements, or fabrication documentation.
A blind flange has no center bore, so it closes a flanged connection rather than allowing the pipe contents to pass through. For related terminology and connection details, see the site’s references on pipe flanges and piping terminology.
Blind Flange 1/2″ Class 900
Blind Flange 1/2″ Class 900 is used to seal the end of a piping system or close off a flange connection in Class 900 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 1/2″ Class 900 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1/2″
- DN Size: DN15
- Flange Thickness: 22.4mm
- Weight: 1.8kg
- Stud Bolt Size: 3/4″ UNC (or M20) x 110 Long
- Number of Bolts: 4
- Hole Diameter: 7/8″ (22.225mm)
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 1/2″ Class 900 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 1/2″ Class 900, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 900 Sizes
This size is part of the Blind Flange Class 900 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 source list separates the key information into nominal size, flange thickness, mass, stud bolt requirements, bolt count, and hole diameter. These fields support different parts of engineering and drafting work: nominal size identifies the connection designation, thickness and weight assist with detailing and handling considerations, and the bolt information helps coordinate the mating flange and fastening layout.
Drafting and CAD Coordination
Use the downloadable DWG with the dimension list as a coordination aid for layouts, nozzle arrangements, maintenance access, and flange-facing details. Confirm that the selected drawing matches the project’s required facing, material, gasket arrangement, and fabrication requirements before issuing it for construction. Related CAD and DWG references can help maintain consistent piping documentation.
Selection and Installation Checks
- Confirm that the nominal pipe size and pressure class match the mating flange and project specification.
- Check the bolt designation, quantity, hole diameter, and available engagement against the complete connection assembly.
- Verify the material specification, gasket type, facing details, and pressure-temperature requirements before procurement or installation.
- Do not treat the class designation alone as a complete allowable-pressure assessment; the applicable material and operating conditions must also be reviewed.
- Use the latest approved project documents and confirm any dimensional differences required by the governing specification.
Related Reference Topics
Readers comparing this item with other flange arrangements may also need the site’s resources for blind flange sizes, flange bolts, and pipe schedules. These links provide useful context, but the local dimension list on this page remains the controlling reference for the stated item.
Frequently Asked Questions
What is a Blind Flange 1/2 Inch Class 900 used for?
It is used to close a flanged piping connection, pipe end, equipment nozzle, or isolation point where a solid blank is required. It may also support maintenance access or a future connection, subject to the project design.
Does a blind flange have a center bore?
No. A blind flange is solid across its central area and is intended to block flow through the connection.
Why must the mating flange be checked?
The flange pair must be compatible in nominal size, class, facing arrangement, bolt pattern, gasket arrangement, and project material requirements. A matching designation alone does not replace a complete connection review.
Can the listed bolt size be used for every installation?
The listed bolt information belongs to the source reference for this flange item. Confirm bolt material, length, engagement, lubrication, tightening procedure, and project requirements before installation.
Is the CAD file ready for fabrication without review?
No. The DWG is a drafting and coordination resource. Review it against the approved specification, mating components, facing details, gasket selection, and fabrication requirements before release.