This reference page summarizes the listed dimensions, weight, bolt information, and CAD resource for a Blind Flange 12 Inch Class 150. Use it when checking flange details for piping layouts, fabrication drawings, equipment connections, or maintenance isolation points.
The dimensional list below should be read together with the project specification. Flange selection also depends on the required material, gasket arrangement, facing, bolting, and pressure-temperature requirements.
Blind Flange 12″ Class 150
Blind Flange 12″ 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 12″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 12″
- DN Size: DN300
- Flange Thickness: 30.2mm
- Weight: 50kg
- Stud Bolt Size: 7/8″ UNC (or M24) x 120 Long
- Number of Bolts: 12
- 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 12″ 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 12″ 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 This Blind Flange Reference
A blind flange is a solid, bored-free flange that closes a piping or equipment connection. Unlike a flange used to join an open pipe, it provides a physical end closure while retaining a bolted connection that can be opened for inspection, maintenance, or future modification.
Nominal Size and Metric Identification
The page identifies the flange as NPS 12 and DN300. These are nominal designations used to coordinate piping components; they should not be treated as a direct measurement of every flange feature. Use the listed flange dimensions and the associated CAD file when preparing fabrication or layout details.
Bolting and Connection Checks
The source data lists the stud bolt size, bolt quantity, bolt length, and hole diameter. These details are important for checking compatibility between the blind flange, mating flange, washers, nuts, gasket, and available installation clearance. Confirm the project bolting specification before ordering or fabrication, especially where the listed inch and metric designations may be treated as alternatives.
Weight and Handling
The listed weight is useful for estimating handling requirements and coordinating installation access. Actual handling plans should also consider the selected material, any coating or facing requirements, lifting method, and site procedures.
CAD and Related Reference Topics
Use the downloadable DWG for drafting and piping-layout coordination, then verify the drawing against the approved project specification before release. Related internal reference opportunities include flange dimensions, pipe schedules, gasket selection, stud bolt terminology, flange facing types, and other Blind Flange Class 150 sizes.
Frequently Asked Questions
What is a Blind Flange 12 Inch Class 150 used for?
It is used to close a pipe end, equipment nozzle, valve connection, or other flanged opening. It can also provide an access point for future maintenance or line extension work.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, which allows it to close the connected piping or equipment opening.
What bolt information is listed for this flange?
The source lists the stud bolt designation and length, the number of bolts, and the hole diameter. Confirm these details against the mating flange and project bolting requirements before installation.
Can the CAD file be used as the final fabrication drawing?
The DWG is provided as a drafting and coordination reference. Final fabrication should be based on the approved project requirements, material specification, gasket arrangement, bolting, and applicable design review.
What should be checked before installation?
Confirm the flange material, gasket type, facing compatibility, bolt requirements, installation access, and applicable pressure-temperature rating. The mating flange and project specification should also be reviewed.