This reference provides the listed dimensions, weight, bolting information, and CAD resource for a Blind Flange 14 Inch Class 150. Use it as a coordination aid when reviewing piping layouts, flange connections, equipment nozzles, and maintenance isolation points.
The source data identifies the nominal size, DN designation, flange thickness, bolt arrangement, hole diameter, and stud bolt specification. For related work, compare this page with other Class 150 flange dimensions, pipe flange bolt dimensions, and piping CAD resources before finalizing drawings or procurement documents.
Blind Flange 14″ Class 150
Blind Flange 14″ 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 14″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 14″
- DN Size: DN350
- Flange Thickness: 33.3mm
- Weight: 64kg
- Stud Bolt Size: 1″ UNC (or M27) x 135 Long
- Number of Bolts: 12
- 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 14″ 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 14″ 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 Use This Blind Flange Reference
A blind flange closes a flanged connection without providing a flow passage. Unlike a weld neck, slip-on, or threaded flange, its solid face is intended to block the line or equipment opening. This makes it useful where a piping section may need isolation, inspection, removal, or future extension.
Understanding the Listed Dimensions
The nominal pipe size and DN designation identify the connection size convention used by the reference. The flange thickness and weight support preliminary layout, handling, and material review. The stud bolt size, bolt count, and hole diameter should be checked together because the flange, gasket, washers, and mating flange must form a compatible bolted assembly.
Class 150 and Connection Compatibility
Class 150 is a flange pressure-class designation, not a universal guarantee that every connected component can be used under the same conditions. Final suitability depends on the applicable pressure-temperature limits, material specification, gasket selection, bolting, facing, piping code, and project requirements. Confirm compatibility with the mating flange and the equipment connection before fabrication or installation.
Using the CAD File
The downloadable DWG can support drafting, piping layout coordination, and preliminary detailing. Treat the drawing as a dimensional reference and verify orientation, flange facing, gasket requirements, clearances, and project-specific modeling conventions before issuing fabrication or construction documents.
Useful Related References
- Class 150 flange dimensions: compare nominal sizes within the same pressure class.
- Flange facing and gasket selection: review sealing details that affect the completed connection.
- Pipe fittings and flange terminology: clarify the difference between blind, weld neck, slip-on, and other flange types.
- Piping CAD and DWG resources: find related files for layout and drafting coordination.
Blind Flange 14 Inch Class 150 FAQ
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 can provide an isolation point and allow later access or line extension when the system is properly depressurized and controlled.
Does a blind flange have a center bore?
No. A blind flange has a solid body rather than a center bore, so it blocks the connected opening when correctly gasketed and bolted.
What information is listed for this flange?
The reference lists the standard, nominal pipe size, DN designation, flange thickness, weight, stud bolt specification, number of bolts, and hole diameter. These values should be reviewed with the mating flange and project specification.
Can the DWG be used directly for fabrication?
The DWG is intended to support drafting and coordination. Before fabrication, verify the drawing against the project specification, applicable standard, material requirements, gasket arrangement, bolting, and the approved engineering design.
Is Class 150 suitable for every piping service?
No. Service suitability depends on pressure and temperature conditions, materials, gasket and bolting choices, connected components, and the governing project or piping code. An engineer or responsible design authority should confirm the final selection.