This reference provides the dimensional and installation-related information for an 8-inch Class 150 blind flange, including its listed weight, stud bolt specification, bolt count, and hole diameter. Use the source data when checking a piping layout, preparing fabrication details, or coordinating the accompanying CAD file.
A blind flange has no center bore, so it closes a flanged connection rather than allowing the pipe to continue through the flange. That makes it useful where a line, nozzle, or equipment connection must be isolated or left ready for future work. The values on this page should be read together with the project specification, gasket requirements, material requirements, and applicable design checks.
Blind Flange 8″ Class 150
Blind Flange 8″ Class 150 is used to seal the end of a piping system or close off a flange connection in Class 150 service. It is a solid flange without a center bore and is commonly applied in industrial piping, maintenance isolation points, and future line expansion connections.
This dimension data is based on ANSI / ASME B16.5.
Blind Flange 8″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 8″
- DN Size: DN200
- Flange Thickness: 26.9mm
- Weight: 20.5kg
- Stud Bolt Size: 3/4″ UNC (or M20) x 110 Long
- Number of Bolts: 8
- 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 8″ Class 150 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 8″ Class 150, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 150 Sizes
This size is part of the Blind Flange Class 150 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
The listed NPS and DN values identify the nominal pipe size using two common designation systems. They are reference identifiers for matching piping components; they should not be treated as a direct measurement of the flange outside dimensions or opening, especially because a blind flange has no center bore.
The flange thickness and weight are useful for drafting, material review, handling planning, and comparing this component with related flanges in the same class series. The bolt information should be checked as a complete assembly: the source lists the stud bolt size and length, the number of bolts, and the hole diameter. Confirm that the selected nuts, washers, gasket, flange facing, and bolting details agree with the project specification before installation.
Using the CAD Drawing in a Piping Workflow
The downloadable DWG can support preliminary drafting, piping layout coordination, equipment connection reviews, and detail development. Before issuing a drawing for fabrication or construction, compare the CAD geometry with the dimension list on this page and with the latest project documents. Pay particular attention to connection alignment, bolt-hole coordination, gasket seating, clearances, and access for tightening or removal.
For broader coordination, link this reference with the site’s related flange dimensions, pipe schedules, flange types, gasket references, and Class 150 blind flange size series. Those related references help confirm that mating components belong to the same intended piping arrangement without replacing project-specific engineering review.
Selection and Installation Checks
- Confirm the flange material and applicable material specification.
- Verify the gasket type and facing compatibility.
- Check the bolting specification, required length, and installation procedure.
- Confirm the applicable pressure-temperature requirements for the service.
- Review isolation, access, and maintenance needs before finalizing the layout.
Blind Flange 8 Inch Class 150 FAQ
What is an 8-inch Class 150 blind flange used for?
It is used to close the end of a piping system, vessel nozzle, valve connection, or other flanged connection. It can also provide an isolation point for maintenance or a future line extension.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its purpose is to close the connection rather than provide a passage for fluid or pipe.
What bolt information is listed for this flange?
The source lists the stud bolt size and length, the number of bolts, and the hole diameter. These details should be checked against the selected gasket, nuts, washers, flange material, and project bolting requirements.
Is Class 150 by itself enough to approve the flange for service?
No. Class designation is only one part of the selection review. Confirm the material, gasket, bolting, service conditions, pressure-temperature requirements, and project specifications before fabrication or installation.
Can the DWG file be used directly for fabrication?
The DWG is provided for drafting, detailing, and piping layout coordination. Review it against the listed reference data and the latest project documents before using it for fabrication or construction.