This reference provides the dimension and bolting details for a Blind Flange 2 Inch Class 900, including its thickness, weight, bolt arrangement, and hole diameter. Use the listed values when checking piping layouts, flange connections, fabrication details, and CAD coordination.
The page also explains how a blind flange functions in a piping system and identifies the project checks that should be completed before procurement or installation. For related design work, compare this reference with the site’s flange dimensions, pipe schedules, fitting dimensions, and piping terminology resources.
Blind Flange 2″ Class 900
Blind Flange 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 2″ Class 900 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 2″
- DN Size: DN50
- Flange Thickness: 38.1mm
- Weight: 10.1kg
- Stud Bolt Size: 7/8″ UNC (or M24) x 145 Long
- Number of Bolts: 8
- Hole Diameter: 1″ (25.4mm)
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 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 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 Read This Blind Flange Reference
The nominal pipe size identifies the connected piping size, while the DN designation provides the corresponding metric reference. These designations are nominal identifiers rather than a direct measurement of every flange feature. The dimension list should therefore be read together with the applicable drawing, mating flange details, gasket requirements, and project specifications.
The flange thickness and listed weight are useful for layout coordination, material handling, and checking whether the component fits within an assembly or equipment connection. The bolt information identifies the specified stud bolt size, length, and number of bolting positions. Confirm that the mating flange, nuts, washers, gasket, and bolt material are compatible before releasing the connection for fabrication.
Blind Flange Selection and Installation Checks
A blind flange closes a piping end or flanged opening without providing a flow passage. Because it may be removed for inspection, maintenance, or future connection work, the closure should be coordinated with the isolation plan and access requirements. A blind flange is not a substitute for verifying the complete pressure-boundary design.
- Check the flange face and gasket arrangement against the mating component.
- Confirm the material specification and applicable pressure-temperature rating for the service.
- Verify bolt length, thread compatibility, washer requirements, and the approved tightening procedure.
- Review clearances around valves, nozzles, supports, insulation, and removable equipment.
- Use the CAD file with the dimension list and project drawings rather than relying on a generic model alone.
The Class designation should be used with the governing standard, material, temperature, gasket, and project requirements. It should not be treated as a standalone pressure value for design approval. The stated ANSI / ASME B16.5 basis and the project’s current specifications should be checked before fabrication or installation.
Frequently Asked Questions
What is a Blind Flange 2 Inch Class 900 used for?
It is used to close a pipe end, equipment connection, valve connection, or nozzle where a solid flanged closure is required. It can also support maintenance isolation and future connection planning.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, so it blocks the connected flow path when correctly installed with the required gasket and bolting.
What bolt information is listed for this flange?
The reference lists 7/8 inch UNC, or M24, studs with a listed length of 145 and a total of 8 bolts. Confirm the final bolting arrangement with the mating flange and project specification.
Is the CAD file suitable for final fabrication?
The downloadable DWG is intended for drafting, detailing, and piping layout coordination. Final fabrication should use verified dimensions, material requirements, gasket details, and the applicable project documentation.
What should be confirmed before installation?
Confirm the latest standard and project requirements, flange material, gasket type, bolt length, mating flange compatibility, and applicable pressure-temperature rating before fabrication or installation.