This reference page provides a practical way to read the dimensional data for a blind flange 1 1/2 inch Class 150. Use the listed size, thickness, weight, fastener information, and bolt-hole details when checking piping drawings, equipment connections, material takeoffs, or CAD layouts.
The technical values below are the controlling local reference for this page. Treat them as dimensional data for coordination, then confirm project-specific requirements before fabrication or installation.
Blind Flange 1 1/2″ Class 150
Blind Flange 1 1/2″ Class 150 is used to seal the end of a piping system or close off a flange connection in Class 150 service. It is a solid flange without a center bore and is commonly applied in industrial piping, maintenance isolation points, and future line expansion connections.
This dimension data is based on ANSI / ASME B16.5.
Blind Flange 1 1/2″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1 1/2″
- DN Size: DN40
- Flange Thickness: 15.9mm
- Weight: 1.8kg
- Stud Bolt Size: 1/2″ UNC (or M14) x 70 Long
- Number of Bolts: 4
- Hole Diameter: 5/8″ (15.875mm)
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 150 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1 1/2″ Class 150, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 150 Sizes
This size is part of the Blind Flange Class 150 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 opening, so its primary function is closure rather than passing pipe through the flange. In a drawing or model, it can represent a closed pipe end, an isolated equipment connection, or a connection reserved for later access or extension.
Reading the dimensional data
- Nominal size: Use the NPS and DN designations to match the flange with the piping system and related fittings.
- Thickness and weight: These values support drawing checks, material estimates, handling planning, and coordination with adjacent components.
- Fastener information: The listed stud bolt description, length, quantity, and hole diameter should be checked against the mating flange, gasket arrangement, washer use, and project bolting specification.
- Reference standard: The cited standard identifies the dimensional basis shown on this page. Project documents may impose additional material, facing, inspection, or service requirements.
Checks before using the CAD file
Use the downloadable drawing as a drafting and layout aid, not as a substitute for the project specification. Confirm the mating flange, gasket selection, bolt assembly, orientation, material grade, and applicable pressure-temperature requirements before releasing fabrication details.
For related research, compare this page with the site references for flange dimensions, pipe schedules, flange facing types, stud bolts, and DWG piping details. These topics help connect the blind flange to the rest of a piping assembly without treating the flange in isolation.
Frequently Asked Questions
What is a blind flange used for?
A blind flange closes the end of a piping system or a flanged connection. It may be used for isolation, maintenance access, equipment blanking, or a future connection point.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its blank face provides the closure surface for the connection.
How should the bolt information be checked?
Compare the listed stud bolt size, length, quantity, and hole diameter with the mating flange and the project bolting requirements. The final assembly also depends on the selected gasket, washers, flange arrangement, and installation procedure.
Can the CAD drawing be used directly for fabrication?
The CAD file is intended to support drafting, detailing, and layout coordination. Verify all project requirements and the applicable dimensional, material, and installation information before fabrication.