This reference provides the available dimensional and installation-related data for a Blind Flange 4 Inch Class 2500. Use it when checking piping layouts, preparing fabrication details, or coordinating a flange connection with equipment, valves, and pipework.
The original data section identifies the governing reference standard, nominal pipe size, flange thickness, weight, stud bolt specification, bolt quantity, and hole diameter. Treat those listed values as the controlling local reference for this page, then confirm them against the project specification before fabrication or installation.
Blind Flange 4″ Class 2500
Blind Flange 4″ Class 2500 is used to seal the end of a piping system or close off a flange connection in Class 2500 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 an extremely high pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 4″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 4″
- DN Size: DN100
- Flange Thickness: 76.2mm
- Weight: 61.5kg
- Stud Bolt Size: 1 1/2″ UNC (or M39) x 255 Long
- Number of Bolts: 8
- Hole Diameter: 1 5/8″ (41.275mm)
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 4″ Class 2500 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Extremely high pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 4″ Class 2500, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 2500 Sizes
This size is part of the Blind Flange Class 2500 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 it closes a flanged piping connection rather than allowing a pipe to pass through it. This makes it useful where a line, nozzle, or equipment connection must be isolated, blanked, inspected, or kept available for possible future work.
For drafting and layout work, check the flange thickness, bolt-hole information, and stud bolt description together. These details affect flange clearances, bolt access, mating-component coordination, and the space required for assembly. The listed weight is also relevant when planning handling and installation activities.
Key Checks Before Ordering or Installation
- Confirm that the nominal pipe size and DN designation match the connected piping or equipment nozzle.
- Verify the flange facing, material specification, gasket selection, and bolting requirements against the project documents.
- Check that the bolt quantity, hole diameter, and stud bolt description are compatible with the mating flange.
- Review the applicable pressure-temperature rating and service conditions with the responsible engineer.
- Use the downloadable DWG for drafting coordination, but do not treat a CAD file as a substitute for dimensional or fabrication verification.
Related Reference Topics
For broader design and drafting context, this page can be used alongside references for flange dimensions, pipe schedules, stud bolts, gaskets, flange facing types, and piping CAD drawings. These related topics help clarify how the blind flange interfaces with the rest of a piping assembly.
Frequently Asked Questions
What is a Blind Flange 4 Inch Class 2500?
It is a solid blind flange reference for a nominal four-inch piping connection in the Class 2500 designation. Its purpose is to close a flanged connection without providing a flow passage.
What information is provided on this page?
The source section provides the reference standard, nominal pipe and DN designations, flange thickness, weight, stud bolt size, bolt quantity, hole diameter, application notes, and a CAD drawing download.
Can the DWG file be used for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. Fabrication should proceed only after the drawing, material requirements, gasket, bolting, and project specifications have been checked.
Why must the mating flange be checked?
A blind flange must coordinate with the connected flange in areas such as bolt-hole alignment, bolting, facing, gasket arrangement, and available installation clearance. These checks help prevent mismatched components.
Does the listed Class 2500 designation replace a pressure-temperature review?
No. The applicable pressure-temperature rating depends on the relevant standard, material, service conditions, and project requirements. Confirm the complete rating basis before selecting or installing the component.