This reference page provides the dimensional data, bolting information, weight, and CAD resource for a Blind Flange 1 Inch Class 1500. Use the technical list below when checking a piping layout, preparing a flange detail, or coordinating a blanked connection with related pipe, valve, and equipment drawings.
A blind flange has no center opening, so it closes a flanged connection rather than allowing the pipe bore to continue through the flange. In practice, the flange dimensions should be reviewed together with the mating flange, gasket, fasteners, facing arrangement, and the project’s pressure-temperature requirements.
Blind Flange 1″ Class 1500
Blind Flange 1″ 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″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1″
- DN Size: DN25
- Flange Thickness: 28.6mm
- Weight: 3.7kg
- Stud Bolt Size: 7/8″ UNC (or M24) x 125 Long
- Number of Bolts: 4
- 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 1″ 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″ 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 Use This Blind Flange Reference
The source data identifies the nominal pipe size, DN designation, flange thickness, weight, stud bolt information, bolt count, and hole diameter. These details are useful for preliminary drafting and coordination, but the final selection should follow the applicable project specification and the requirements identified in the notes on this page.
Bolting and Connection Checks
Confirm that the listed stud bolt size, thread designation, length, and quantity match the mating flange and the selected gasket arrangement. Bolt length can be affected by flange thickness, gasket construction, washers, and the required thread engagement. Do not treat the bolt listing as a substitute for a complete bolting check.
CAD and Piping Layout Coordination
The downloadable DWG can support drafting, equipment connection layouts, piping isometrics, and clearance reviews. Before issuing a drawing, verify the flange orientation, bolt-hole alignment, facing details, and connection location against the project model and the mating component. Related references for flange dimensions, pipe schedules, fittings, and piping terminology can help maintain consistent drafting across the design package.
Material, Gasket, and Rating Review
The class designation alone does not replace a project-specific pressure-temperature review. Confirm the flange material, gasket type, facing requirements, service conditions, and applicable specification before fabrication or installation. Where the blind flange is used for isolation or future expansion, identify the closure clearly in the piping documentation and apply the project’s required inspection and safety controls.
Frequently Asked Questions
What is a Blind Flange 1 Inch Class 1500?
It is a solid flange used to close the end of a pipe, nozzle, valve connection, or other flanged opening. The page’s source data provides its listed dimensions, weight, bolt information, and CAD file.
Does a blind flange have a center bore?
No. A blind flange is a blank closure and does not provide a through-bore like a weld neck, slip-on, or threaded flange.
What should be checked before ordering this flange?
Check the mating flange, flange facing, gasket type, material specification, stud bolt requirements, bolt-hole alignment, and applicable pressure-temperature rating. Project requirements may govern details beyond the reference dimensions.
Can the DWG file be used for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. Fabrication should be based on the approved project documents and verified technical requirements rather than an unreviewed reference drawing alone.
Where can this flange be used?
The source content identifies applications including pipe-end closure, equipment isolation, valve and nozzle blanking, maintenance shutdown work, process and utility piping, and high-pressure piping service. Actual application suitability requires engineering and project-specification verification.