Use this reference when checking the dimensional and drafting information for a Blind Flange 12 Inch Class 1500. The page brings together the listed flange thickness, weight, stud bolt specification, bolt count, hole diameter, and CAD drawing reference without replacing the project documents used for fabrication or installation.
For related design work, compare this page with the site’s references for flange dimensions, pipe schedules, gasket selection, and piping terminology. Those references help coordinate the blind flange with the connected piping and mating flange.
Blind Flange 12″ Class 1500
Blind Flange 12″ 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 12″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 12″
- DN Size: DN300
- Flange Thickness: 124mm
- Weight: 314kg
- Stud Bolt Size: 2″ UNC (or M52) x 375 Long
- Number of Bolts: 16
- Hole Diameter: 2 1/8″ (53.975mm)
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 12″ 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 12″ 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
A blind flange has no center bore, so it closes a flanged connection rather than providing a passage for fluid. In a piping layout, it may identify a permanent closure, an isolation point, an equipment connection, or a location reserved for future work. The flange itself is only one part of the connection; the mating flange, gasket, studs or bolts, nuts, and installation procedure must also be checked.
The listed Class 1500 designation should be read together with the applicable pressure-temperature rating, material specification, gasket requirements, and project design conditions. A pressure class should not be treated as a standalone approval for a particular service. Confirm the complete design basis before procurement, fabrication, or installation.
Quick Reference for Drafting and Checking
- Size identification: NPS 12 and DN300 identify the nominal connection size shown in the source data.
- Thickness and weight: The listed flange thickness is 124mm and the listed weight is 314kg. Confirm whether handling plans and drawing units match the project requirements.
- Fastener notation: The source lists 2″ UNC (or M52) x 375 Long for the stud bolts. Check the project’s required thread system, material, nut arrangement, and engagement before ordering.
- Bolting pattern: The source lists 16 bolts and a hole diameter of 2 1/8″ (53.975mm). Use these values when coordinating the flange drawing with the mating flange.
- CAD coordination: Use the supplied DWG as a drafting reference, then confirm interfaces, facing details, gasket dimensions, and project-specific revisions before issuing construction documents.
Related Reference Topics
Useful internal references include flange facing types, flange bolt dimensions, pipe flange terminology, gasket dimensions, and CAD/DWG piping resources. Linking these topics from the page can help readers move from dimensional lookup to connection detailing and installation checks.
Blind Flange 12 Inch Class 1500 FAQ
What is the purpose of a blind flange?
A blind flange closes the end of a pipe, vessel nozzle, valve connection, or other flanged opening. It can support isolation, maintenance work, inspection access, or a future connection, subject to the project design and operating requirements.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its sealing performance depends on the flange faces, gasket, fasteners, assembly, and the requirements of the connected system.
What bolt information is listed for this flange?
The source lists 2″ UNC (or M52) x 375 Long stud bolts, 16 bolts, and a hole diameter of 2 1/8″ (53.975mm). Confirm the applicable fastener specification and compatibility with the mating flange before procurement.
Can the supplied DWG be used directly for fabrication?
The DWG is provided as a drafting and layout reference. Before fabrication, compare it with the project drawing, material specification, gasket requirements, pressure-temperature rating, and the latest approved engineering information.