This reference page provides the dimensional and connection information for a Blind Flange 1 1/2 Inch Class 2500. Use the listed values when reviewing piping layouts, flange details, fabrication drawings, and component selections.
The page also explains how to interpret the flange data, distinguish bolt dimensions from bolt-hole dimensions, and use the CAD resource during drafting coordination. Always compare the listed information with the approved project specification before fabrication or installation.
Blind Flange 1 1/2″ Class 2500
Blind Flange 1 1/2″ 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 1 1/2″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1 1/2″
- DN Size: DN40
- Flange Thickness: 44.4mm
- Weight: 10.5kg
- Stud Bolt Size: 1 1/8″ UNC (or M30) x 170 Long
- Number of Bolts: 4
- Hole Diameter: 1 1/4″ (31.75mm)
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 1 1/2″ 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 1 1/2″ 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 Read the Blind Flange Reference
A blind flange has no center bore, so its primary function is to close a flanged connection rather than provide a passage for fluid. In a drawing or piping model, it may represent a permanent end closure, an access point for future work, or an isolation location that can be removed when the system is shut down and made safe.
The dimensional list identifies the nominal pipe size, DN designation, flange thickness, weight, stud bolt information, bolt quantity, and hole diameter. These values should be read together rather than treated as interchangeable dimensions. For example, the stud bolt size describes the threaded fastener, while the hole diameter describes the clearance opening in the flange.
Bolting and Assembly Checks
Before preparing a fabrication detail, check that the bolt pattern, gasket arrangement, mating flange, washers, and available thread engagement agree with the project requirements. The listed bolt length is a reference for this flange arrangement; the required installed length can be affected by the mating component, gasket, washers, and assembly details.
Using the CAD File
The downloadable DWG can support preliminary drafting, equipment arrangement, piping layout coordination, and checking of adjacent components. Treat the drawing as a reference resource and verify critical interfaces against the approved dimensional data and project documents before issuing fabrication or construction drawings.
Related Piping References
For broader design work, connect this page with internal references for blind flange dimensions, pipe flange classes, ASME flange terminology, stud bolt dimensions, gasket selection, and piping CAD blocks. These related topics help readers move from an individual component reference to a complete flange connection review.
Frequently Asked Questions
What is a Blind Flange 1 1/2 Inch Class 2500 used for?
It is used to close a flanged piping, equipment, valve, or nozzle connection. Typical uses include end closure, isolation, maintenance work, and provisions for future system changes.
Does a blind flange have a pipe bore?
No. A blind flange is a solid flange without a center bore. Its sealing function is provided across the closed face when it is assembled with the required gasket and mating connection.
What bolt information is listed for this flange?
The reference identifies the stud bolt size, an alternate metric designation, the listed bolt length, and the number of bolts. Confirm the complete bolting arrangement against the mating flange and project specification.
Is bolt size the same as hole diameter?
No. Bolt size refers to the threaded stud or bolt. Hole diameter refers to the opening through the flange for that fastener. The two dimensions must be compatible, but they describe different parts of the connection.
Can the listed weight be used for lifting planning?
Use the listed weight as a component reference, not as the sole basis for lifting or handling planning. Confirm the supplied product, material, surface treatment, and any attached items before selecting handling equipment.
Does the Class 2500 designation alone determine allowable pressure?
No. A flange class designation must be considered with material, temperature, applicable standard requirements, gasket selection, bolting, and the approved design conditions. Do not infer a complete pressure-temperature limit from the class designation alone.