This reference page provides the listed dimensions and connection details for a Blind Flange 16 Inch Class 1500. Use the existing data for drafting, flange selection, purchasing checks, and piping coordination, while treating the project specification as the controlling requirement.
For related design work, compare this page with references covering flange dimensions, pipe schedules, stud bolts, gaskets, and CAD/DWG piping details. These topics help connect the flange record to the rest of a piping system without confusing nominal pipe size with the flange’s blanking function.
Blind Flange 16″ Class 1500
Blind Flange 16″ 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 16″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 16″
- DN Size: DN400
- Flange Thickness: 146mm
- Weight: 591kg
- Stud Bolt Size: 2 1/2″ UNC (or M64) x 445 Long
- Number of Bolts: 16
- Hole Diameter: 2 5/8″ (66.675mm)
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 16″ 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 16″ 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 closes a flanged connection because it has no central pipe opening. Its practical purpose may be permanent closure, temporary isolation, equipment blanking, maintenance access, or provision for a future connection. The correct use depends on the piping arrangement, isolation procedure, gasketed joint, and project design requirements.
Reading the Dimension Information
The source data identifies the nominal pipe size, DN designation, flange thickness, weight, stud bolt information, bolt quantity, and hole diameter. The hole diameter belongs to the bolting arrangement; it should not be interpreted as a pipe bore or flow passage. Because the flange is blind, there is no central bore through which process fluid passes.
The listed stud bolt entry includes an imperial UNC designation or a metric designation, together with a stated length. Select the bolting system required by the project rather than combining designations without verification. Bolt length, thread engagement, washer use, flange facing, gasket construction, and tightening procedure should be checked together.
Design and Installation Checks
- Confirm the flange material and facing requirements against the piping specification.
- Verify the applicable pressure-temperature rating for the selected material and service condition.
- Check gasket compatibility, contact surfaces, and joint assembly requirements.
- Coordinate the bolt pattern with the mating flange before fabrication or installation.
- Use the downloadable DWG as a drafting aid, then confirm critical dimensions against the approved project documents.
The Class designation should not be treated as a standalone allowable pressure for every material and temperature. Final selection requires review of the applicable standard, material documentation, service conditions, and engineering approval.
Related Piping Reference Topics
This page can be used alongside internal references for blind flange classes, flange bolt dimensions, pipe and fitting terminology, and piping CAD blocks. Linking these topics helps readers move from a single flange record to the broader connection, drafting, and procurement context.
Frequently Asked Questions
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, equipment blanking, or future line-extension work.
Does the hole diameter represent the pipe opening?
No. On this reference page, the stated hole diameter is part of the bolting arrangement. A blind flange has no central bore or flow opening.
Can the listed UNC and metric stud designations be mixed?
The source lists an imperial UNC option or a metric option. Use the bolting system required by the approved project specification and verify compatibility with the mating flange, nuts, washers, and assembly procedure.
Is the CAD file sufficient for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. Fabrication should also be based on approved drawings, the applicable standard, material requirements, and project-specific verification.