This reference provides the dimensional and connection information for a Blind Flange 1/2 Inch Class 1500. Use the data below when checking a piping drawing, preparing a flange detail, or coordinating a CAD model with adjacent components.
Because a blind flange closes a connection rather than passing fluid through a bore, flange selection should be reviewed together with the mating flange, gasket, bolting, material specification, and project requirements. The listed dimensions remain the controlling local reference for this page.
Blind Flange 1/2″ Class 1500
Blind Flange 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 1/2″ Class 1500 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 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 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 page identifies the flange by nominal pipe size and pressure class, then lists the principal dimensional and installation references. NPS is the U.S. nominal pipe-size designation, while DN is the corresponding metric designation used in many international drawings and specifications. These labels identify the nominal connection size; they are not a substitute for checking the detailed flange geometry.
The thickness and weight entries are useful for drafting, material takeoffs, handling planning, and preliminary coordination. Weight can also matter when reviewing support loads or lifting arrangements, but the final design should account for the complete assembly and the applicable project requirements.
Bolting and Connection Checks
Review the listed stud-bolt designation, bolt length, quantity, and hole diameter together. The mating flange must have a compatible bolt pattern and connection arrangement. Confirm the gasket selection, facing details, thread compatibility, tightening procedure, and required clearances before fabrication or installation.
Using the CAD File
The downloadable DWG is intended to support drafting, piping layout coordination, and detail development. Treat CAD geometry as a reference aid and verify it against the dimension list and the project’s approved specification before issuing fabrication or construction drawings.
Related Pipe and Flange References
For broader design coordination, link this page with related references for Class 1500 blind flanges, flange bolt dimensions, pipe schedules, gasket selection, and flange facing terminology. Comparing adjacent sizes within the same flange series can help users locate matching CAD files and check connection continuity, but each size should be verified independently.
Frequently Asked Questions
What is a blind flange used for?
A blind flange is a solid flange used to close a pipe end, vessel nozzle, valve connection, or other flanged opening. It can provide an isolation point and allow later access for maintenance or line extension, subject to the approved engineering and safety procedure.
What does Class 1500 identify?
Class 1500 identifies the flange pressure-class designation used by the referenced flange standard. The allowable service condition still depends on factors such as material, temperature, gasket, bolting, and the applicable project requirements.
Why should the bolt details be checked against the mating flange?
The flange must connect to a compatible bolt pattern, hole arrangement, gasket, and facing. Checking the listed bolt information against the mating component helps prevent drafting, procurement, and installation mismatches.
Can the DWG be used directly for fabrication?
The DWG can support drafting and layout coordination, but it should be checked against the page dimensions, the latest approved specification, and project-specific fabrication requirements before release.
What should be confirmed before installation?
Confirm the flange material, gasket type, bolting, bolt length, tightening method, pressure-temperature requirements, and mating-component compatibility. The project engineer or responsible piping authority should approve the final selection.