This reference provides the listed dimensions, weight, stud bolt information, bolt count, and hole diameter for an 8-inch Class 1500 blind flange. Use it alongside the downloadable CAD file when checking piping layouts, flange details, and equipment connection arrangements.
A blind flange has no center bore, so it closes a flanged connection rather than allowing pipe flow through the flange. The source data below is intended for reference and drafting coordination; fabrication and installation should follow the applicable project specification and engineering review.
Blind Flange 8″ Class 1500
Blind Flange 8″ Class 1500 is used to seal the end of a piping system or close off a flange connection in Class 1500 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 very high pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 8″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 8″
- DN Size: DN200
- Flange Thickness: 92.1mm
- Weight: 136kg
- Stud Bolt Size: 1 5/8″ UNC (or M42) x 290 Long
- Number of Bolts: 12
- Hole Diameter: 1 3/4″ (44.45mm)
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 8″ Class 1500 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Very high pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 8″ Class 1500, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 1500 Sizes
This size is part of the Blind Flange Class 1500 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 the Blind Flange Reference Data
The nominal pipe size and DN designation identify the flange size using two commonly used piping conventions. They should be checked against the mating flange, pipe, valve, nozzle, or equipment connection before a drawing is released.
Flange thickness and weight are useful for layout review, material handling, support coordination, and shipment planning. The listed stud bolt size, length, number of bolts, and hole diameter should be considered together when checking the bolted connection. Bolt compatibility also depends on the mating flange, gasket arrangement, material requirements, and project bolting specification.
Using the CAD File
The downloadable DWG can support drafting and piping-layout coordination. Before using it for fabrication, confirm that the drawing reflects the required flange facing, material, gasket arrangement, tolerances, and project notes. CAD geometry should not override the tabulated reference data or the approved engineering documents.
Related Piping References
For broader design and drafting work, connect this reference with related pages covering flange dimensions, pipe schedules, stud bolts and nuts, gasket selection, and CAD flange drawings. Comparing the matching flange and pipe references can help identify connection mismatches before installation.
Verification Before Installation
- Confirm the mating flange size and class designation.
- Check the facing and gasket requirements against the project specification.
- Verify bolt material, thread form, length, and tightening requirements.
- Review the applicable pressure-temperature rating and material documentation.
- Coordinate access, clearance, supports, and isolation requirements with the piping layout.
Blind Flange 8 Inch Class 1500 FAQ
What is an 8-inch Class 1500 blind flange used for?
It is used to close the end of a pipe, vessel nozzle, valve connection, or other flanged opening. It can also provide an isolation point or allow a connection to remain available for future work.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, which allows it to block the connected opening when correctly gasketed and bolted.
What information is provided on this page?
The reference lists the nominal pipe size, DN designation, flange thickness, weight, stud bolt information, bolt count, and hole diameter for the specified flange.
Can the DWG file be used directly for fabrication?
The DWG is intended to support drafting and layout coordination. Confirm the drawing, material, facing, gasket, bolting, tolerances, and project requirements before fabrication or installation.
Is the Class 1500 designation enough to select the flange?
No. Selection also requires confirmation of the applicable pressure-temperature rating, material, mating components, gasket, bolting, and project requirements. Engineering review is required for the final application.