This reference page provides the source dimensions, weight, bolting information, and CAD resource for a Blind Flange 2 1/2 Inch Class 1500. Use the listed data when checking piping layouts, preparing fabrication details, or coordinating a flange connection with valves, equipment, and adjacent pipework.
A blind flange has no center bore, so its primary function is closure rather than connection to a passing pipe. The dimensional list below identifies the nominal size, DN designation, thickness, bolt arrangement, hole diameter, stud bolt specification, and weight reported for this flange. For related design work, connect this reference with the site’s pipe dimensions and schedules, flange terminology, piping components, and CAD/DWG resources.
Blind Flange 2 1/2″ Class 1500
Blind Flange 2 1/2″ 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 2 1/2″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 2 1/2″
- DN Size: DN65
- Flange Thickness: 41.1mm
- Weight: 15.9kg
- Stud Bolt Size: 1″ UNC (or M27) x 160 Long
- Number of Bolts: 8
- Hole Diameter: 1 1/8″ (28.575mm)
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 1/2″ 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 2 1/2″ 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 This Blind Flange Reference
The nominal pipe size and DN size identify the connection category used for piping coordination. The flange thickness and weight are useful for layout review, handling planning, support discussions, and checking whether the selected component agrees with the project material and fabrication documentation.
The bolt information should be reviewed as a coordinated set. The listed stud bolt size, length, number of bolts, and hole diameter affect flange assembly and must agree with the mating flange, gasket, washers where specified, and the project’s bolting procedure. Do not select replacement hardware from nominal size alone; confirm the required thread system, material, engagement, clearance, and final bolt-up requirements before installation.
Using the CAD Drawing
The downloadable DWG is intended to support drafting, detailing, and piping layout coordination. Treat the drawing as a dimensional reference for the component shown on this page. Before issuing fabrication or installation documents, check the drawing against the project specification, mating flange details, gasket selection, orientation requirements, and the applicable piping class.
Class, Materials, and Service Checks
The Class 1500 designation should be reviewed together with the flange material, temperature, fluid service, gasket, and project pressure-temperature requirements. A class designation by itself is not a complete design check. Confirm that the selected flange, bolting, gasket, and connected equipment are compatible and approved for the actual service.
For maintenance isolation, valve or nozzle blanking, and future line connections, verify that the blind flange can be safely installed, removed, and supported. Isolation procedures, depressurization, hazardous-energy controls, and engineering approval remain essential parts of field work.
Related Reference Topics
- Pipe dimensions and schedules for checking adjacent pipework
- Flange types and facing terminology for mating-component selection
- Stud bolts, nuts, and gasket references for connection assembly
- CAD and DWG resources for piping layout and fabrication documentation
Frequently Asked Questions
What is a blind flange used for?
A blind flange closes the end of a pipe, vessel nozzle, valve connection, or other flanged opening. It is useful where a line must be isolated or where a future maintenance or extension point is required.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its dimensions and bolting pattern must match the mating flanged connection.
What should be checked before ordering this flange?
Confirm the nominal size, flange class, facing and mating connection, material specification, gasket type, bolt and stud requirements, service conditions, and project pressure-temperature limits. Also verify that the CAD file and dimensional data match the revision used for the project.
Can the DWG file replace an engineering design check?
No. The DWG supports drafting and coordination, but it does not replace verification of materials, loads, pressure-temperature suitability, gasket selection, bolting, installation procedure, or project specifications.