This reference page provides the published dimensions and drafting information for a Blind Flange 6 Inch Class 1500. Use the source data below when checking a piping layout, preparing a flange detail, or coordinating the associated CAD file.
The flange is identified by its nominal pipe size and pressure class. The page also distinguishes the stud bolt specification, bolt-hole diameter, bolt count, thickness, and listed weight—details that should be checked separately during design and procurement.
Blind Flange 6″ Class 1500
Blind Flange 6″ 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 6″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 6″
- DN Size: DN150
- Flange Thickness: 82.6mm
- Weight: 75kg
- Stud Bolt Size: 1 3/8″ UNC (or M36) x 260 Long
- Number of Bolts: 12
- Hole Diameter: 1 1/2″ (38.1mm)
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 6″ 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 6″ 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 its primary function is to close a flanged connection rather than provide a flow path. In a drawing, it may represent a permanent end closure, an isolation point, an equipment blank, or a connection reserved for later work.
Interpreting the Dimension Data
- NPS and DN: NPS 6 and DN150 identify the nominal pipe-size designation used for coordination with piping components.
- Thickness and weight: These are listed reference values for this flange entry. Confirm material, facing, manufacturing requirements, and project documentation before using them for procurement or handling planning.
- Stud bolts and holes: The stud bolt specification and the hole diameter describe related but different items. The bolt must be checked against the flange-hole arrangement, nut engagement, gasket system, and the project bolting specification.
- Pressure class: Class 1500 is a flange pressure-class designation, not a universal allowable pressure for every material or operating condition. Final pressure-temperature suitability requires the applicable rating information and project verification.
Drafting and Coordination Checks
When using the downloadable DWG, verify the drawing units, insertion scale, flange facing representation, bolt-circle alignment, and connection orientation before incorporating it into a piping layout. Coordinate the flange with the adjoining pipe, valve, nozzle, gasket, and bolting details rather than treating the CAD file as a fabrication approval.
Useful related references include flange dimensions, flange facing types, stud bolt terminology, pipe schedules, and CAD piping blocks. Linking this page to those resources can help readers move from a dimensional lookup to a complete connection check.
Blind Flange 6 Inch Class 1500 FAQ
What is a Blind Flange 6 Inch Class 1500 used for?
It is used to close the end of a piping system or blank a flanged connection. Typical uses include equipment isolation, maintenance shutdown work, valve or nozzle blanking, and future connection points.
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 flow path at a flanged connection.
Are the stud bolt size and hole diameter the same thing?
No. The stud bolt size identifies the specified bolting, while the hole diameter identifies the flange opening through which the bolt passes. Both should be checked together with the nuts, gasket, flange facing, and project bolting requirements.
Can the listed weight be used for lifting design?
The listed weight is a reference value for this flange entry. Confirm the actual supplied component, coating, accessories, and handling requirements before preparing a lifting or installation plan.
Can the DWG file be used directly for fabrication?
The DWG is intended to support drafting, detailing, and piping-layout coordination. Review its units and geometry against the approved project documents and the supplied component before fabrication.
What should be verified before installation?
Confirm the project material specification, gasket type, bolt length, flange facing, applicable pressure-temperature rating, and the latest project requirements before fabrication or installation.