This reference page provides the listed dimensions and connection details for a Blind Flange 14 Inch Class 400. Use it when checking a piping layout, preparing fabrication drawings, comparing flange components, or locating the associated CAD file.
A blind flange has no center bore, so it closes a flanged connection rather than allowing the pipe contents to pass through. The source data below identifies the nominal size, flange thickness, weight, stud bolt information, bolt quantity, and hole diameter for this specific flange entry.
Blind Flange 14″ Class 400
Blind Flange 14″ Class 400 is used to seal the end of a piping system or close off a flange connection in Class 400 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 higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 14″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 14″
- DN Size: DN350
- Flange Thickness: 60.5mm
- Weight: 132kg
- Stud Bolt Size: 1 1/4″ UNC (or M33) x 210 Long
- Number of Bolts: 20
- Hole Diameter: 1 3/8″ (34.925mm)
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 400 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 14″ Class 400, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 400 Sizes
This size is part of the Blind Flange Class 400 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
Begin by confirming that the nominal pipe size and class designation match the mating flange, valve, nozzle, or equipment connection. The page identifies the nominal size as NPS 14 and also provides the corresponding DN designation. These identifiers are useful when cross-checking flange dimensions, piping specifications, and CAD details across a project.
The bolt information should be read together with the mating component and the project bolting specification. Stud diameter, thread designation, length, bolt count, and hole diameter affect fit-up, but they do not by themselves establish the complete installation requirement. Confirm the gasket arrangement, flange facing, material specification, tightening procedure, and applicable project requirements before procurement or installation.
Why the Class Designation Matters
Class 400 is a flange pressure-temperature class designation. It should not be treated as a single allowable pressure for every service condition. The applicable pressure-temperature rating depends on the governing standard, material, temperature, and project design conditions. Use the listed class as a component-identification reference, then verify the design basis with the responsible engineer or piping specification.
CAD and Drafting Workflow
The linked DWG file can support preliminary drafting, piping layout coordination, and detail development. Before issuing a drawing, compare the CAD geometry with the authoritative dimension list on this page and confirm the mating flange, gasket, bolting, and facing requirements. Related pipe dimensions, flange dimensions, and piping terminology references can help maintain consistent notation across drawings.
Selection and Installation Checks
- Verify the flange class and nominal size against the piping line or equipment nozzle.
- Confirm that the bolt holes align with the mating flange before installation.
- Check gasket selection and facing compatibility with the service specification.
- Confirm material, coating, bolting, and tightening requirements before assembly.
- Do not use the listed weight or dimensions as a substitute for a project-specific design review.
Frequently Asked Questions
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 a removable closure for isolation, maintenance, inspection, or a future connection.
Does this blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, which allows it to seal the opening at a flanged connection.
What bolt information is listed for this flange?
The source entry lists the stud bolt size and length, the number of bolts, and the hole diameter. Confirm these details against the mating flange and the project bolting specification before installation.
Is Class 400 a direct pressure value?
No. Class 400 identifies a pressure-temperature flange class. The allowable rating for an installed component must be confirmed for the applicable material, temperature, standard, and design conditions.
Can the DWG file be used for fabrication?
The DWG file is provided as a drafting and layout reference. Fabrication or installation drawings should be checked against the listed dimensions, mating components, project specifications, and approved engineering requirements.
What should be checked before ordering?
Verify the nominal size, class, standard reference, material specification, flange facing, gasket requirements, bolt details, and applicable pressure-temperature rating. Also confirm that the supplied component matches the project drawings and piping specification.