This reference covers the dimensions and connection details for a Blind Flange 2 Inch Class 1500. Use it when checking a piping layout, preparing fabrication drawings, coordinating equipment connections, or selecting a matching closure flange.
The page combines a dimension reference with practical guidance on blind-flange use, bolt-hole interpretation, CAD coordination, and pre-installation verification. Treat the listed project and standard requirements as controlling whenever they differ from a preliminary drawing reference.
Blind Flange 2″ Class 1500
Blind Flange 2″ 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 2″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 2″
- DN Size: DN50
- Flange Thickness: 38.1mm
- Weight: 10.1kg
- Stud Bolt Size: 7/8″ UNC (or M24) x 145 Long
- Number of Bolts: 8
- Hole Diameter: 1″ (25.4mm)
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 2″ 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 2″ 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 Read 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 passage for the pipe. The flange thickness, bolt-hole information, bolt quantity, and listed stud-bolt specification should be reviewed together because they affect drawing coordination and the assembled connection.
Bolting and gasket coordination
The listed stud-bolt size and length are reference details for this flange entry. Before procurement or installation, confirm thread compatibility, bolt material, required engagement, washer use, tightening procedure, and the project torque requirements. Bolt length should also be checked against the actual flange, gasket, and mating-connection arrangement rather than copied into a purchase order without review.
Gasket selection is a separate engineering and piping-material decision. Confirm the gasket type, dimensions, pressure-temperature requirements, flange facing, and service compatibility with the applicable piping class and project specification.
Using the CAD file
The downloadable DWG can support drafting, layout coordination, and preliminary space checks. CAD geometry should be treated as a reference until it has been checked against the dimension list and the project’s approved piping documents. Confirm orientation, mating-flange alignment, clearances, and any field requirements before fabrication.
Related piping references
- Compare this entry with the site’s other Class 1500 blind flange dimensions when reviewing a piping series.
- Use related flange dimensions and bolt-pattern references to check mating connections.
- Consult the site’s pipe schedules and fitting dimensions when coordinating the connected piping.
- Review the piping terminology guide if NPS, DN, stud bolts, or flange closure terms need clarification.
Before release for fabrication
- Confirm the applicable standard and project revision.
- Verify flange material, gasket specification, and pressure-temperature requirements.
- Check the mating flange, bolt-hole alignment, and assembly access.
- Confirm that the CAD file and dimension reference agree with the approved design documents.
Frequently Asked Questions
What is a 2 Inch Class 1500 blind flange?
It is a solid flange used to close a piping or equipment connection identified in this reference as NPS 2 inch and Class 1500. Because it has no center bore, it provides a removable closure point for isolation, maintenance, or future connection work.
How many bolts are listed for this flange?
The source dimension list specifies the bolt quantity, stud-bolt designation, and hole diameter. Use those listed values together when checking a mating flange or preparing a bolt-material request.
Does the Class 1500 designation alone determine allowable pressure?
No. The applicable pressure-temperature rating depends on the governing standard, flange material, temperature, service conditions, and project requirements. Confirm the complete rating basis before design approval or installation.
Can the DWG be used directly for fabrication?
The DWG is intended to support drafting, detailing, and coordination. Verify its geometry against the listed dimensions, approved project documents, material requirements, and the mating connection before releasing fabrication information.
What should be checked before installing the blind flange?
Confirm the flange material, gasket, facing, bolt compatibility, bolt length, alignment, tightening method, and applicable pressure-temperature requirements. The final checks should follow the approved piping specification and engineering documentation.