This reference page provides dimension data and drafting context for a Blind Flange 1 1/2 Inch Class 1500. A blind flange has no center opening, so it closes a flanged piping connection rather than allowing fluid to pass through.
Use the dimensional information below when reviewing piping layouts, flange connections, maintenance isolation points, or future extension details. For fabrication and installation, compare the listed flange data with the project specification, mating flange, gasket, bolting, material requirements, and applicable pressure-temperature limits.
Blind Flange 1 1/2″ Class 1500
Blind Flange 1 1/2″ 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 1 1/2″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1 1/2″
- DN Size: DN40
- Flange Thickness: 31.8mm
- Weight: 5.9kg
- Stud Bolt Size: 1″ UNC (or M27) x 140 Long
- Number of Bolts: 4
- Hole Diameter: 1 1/8″ (28.575mm)
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 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 1 1/2″ 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
The source data identifies the nominal pipe size, DN designation, flange thickness, weight, stud bolt information, bolt count, and hole diameter. These values describe the selected flange configuration and should be reviewed together rather than treated as interchangeable details.
Class designation and pressure checks
The Class 1500 designation identifies the flange pressure class within the referenced flange standard. It should not be treated as a standalone allowable working pressure. The permitted service condition depends on factors such as flange material, temperature, gasket selection, bolting, joint assembly, and the governing project requirements.
Connection and installation considerations
A blind flange transfers the end-load and sealing function through the bolted flange joint. Confirm that the mating flange face, gasket type, stud bolts, nuts, washer requirements, and tightening procedure are compatible. Bolt length should be checked against the actual joint stack-up, including flange thickness, gasket thickness, and any washers or coatings specified by the project.
Useful related references
- Compare this entry with related blind flange dimensions when selecting another nominal size or pressure class.
- Review pipe schedules and dimensions to coordinate the flange connection with the adjoining pipe.
- Use the site’s flange terminology and gasket references to clarify facing, sealing, and bolting requirements.
- Open the related CAD/DWG piping resources when developing layouts, equipment connection details, or fabrication drawings.
CAD and drawing coordination
The downloadable DWG is useful for drafting and layout coordination, but a CAD file does not replace a dimensional, material, or fabrication review. Check the drawing unit system, insertion scale, flange orientation, mating components, and project-specific drawing conventions before issuing design documents.
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 support isolation, maintenance, inspection, or a planned future connection.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its sealing surface closes the opening at the flanged joint.
What does Class 1500 mean?
Class 1500 is the pressure-class designation shown for this flange configuration. The applicable pressure-temperature rating must still be confirmed for the selected material and service conditions.
Can the listed bolt size be used for every mating flange?
No. Confirm the mating flange drilling, hole diameter, bolt material, thread form, required length, gasket, and project bolting specification before assembly.
Is the DWG file sufficient for fabrication?
No. Use the DWG as a drafting reference and verify it against the authoritative dimensional data, purchase specification, material requirements, and approved fabrication documents.