This reference provides the key dimensions and connection details for a 16 inch Class 150 blind flange, including flange thickness, weight, bolt arrangement, and bolt-hole information. Use the dimension list below for drafting, purchasing, fabrication review, and piping coordination.
For related design work, compare this page with the applicable flange dimensions, pipe schedules, stud bolt references, and piping CAD resources. The local dimension data on this page remains the controlling reference for this specific flange entry.
Blind Flange 16″ Class 150
Blind Flange 16″ 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 16″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 16″
- DN Size: DN400
- Flange Thickness: 35.1mm
- Weight: 82kg
- Stud Bolt Size: 1″ UNC (or M27) x 135 Long
- Number of Bolts: 16
- 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 16″ 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 16″ 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 Read This Blind Flange Reference
A blind flange has no center bore, so it closes a pipe end, vessel nozzle, valve connection, or other flanged opening. Unlike a flange intended to pass fluid through a pipe, the blank face forms the closure connection. It may be removed later for inspection, maintenance, equipment isolation, or a future piping extension.
NPS and DN Designations
The page identifies the flange using both the nominal pipe size, or NPS, and the corresponding DN designation. These labels are nominal identifiers rather than a complete description of the flange geometry. Always use the listed dimensions and the project drawing when checking compatibility with adjoining components.
Bolt and Hole Information
The reference identifies the stud bolt designation, bolt length, number of bolts, and hole diameter. These details should be checked together when preparing a flange connection. Bolt selection also depends on the project material specification, gasket arrangement, tightening procedure, and installation requirements. Do not assume that a bolt designation alone confirms the complete joint design.
Using the CAD File
The downloadable DWG file can support piping layout, equipment coordination, detailing, and preliminary drafting. Before issuing a drawing for fabrication or construction, verify the CAD geometry against the dimension list, project specifications, gasket requirements, facing details, and the mating flange.
Project Verification Checklist
- Confirm the flange designation and applicable standard.
- Check the mating flange, gasket, and facing arrangement.
- Verify material requirements and pressure-temperature conditions through the project specification.
- Confirm bolt size, length, quantity, and installation requirements.
- Review the final connection with the responsible piping or mechanical engineer before fabrication or installation.
Frequently Asked Questions
What is a 16 inch Class 150 blind flange used for?
It is used to close a pipe end or flanged opening, including equipment connections, valve connections, and maintenance isolation points. It can also support a future line extension where a removable closure is required.
Does a blind flange have a center opening?
No. A blind flange is a solid blank flange without a center bore. Its purpose is to close the connected piping or equipment opening.
What bolt information is provided for this flange?
The reference lists the stud bolt designation and length, the number of bolts, and the hole diameter. Review all of these details with the gasket, mating flange, material specification, and tightening requirements before installation.
Can the DWG file be used for fabrication?
The DWG file is intended to assist drafting, detailing, and piping layout coordination. Fabrication should proceed only after the drawing and dimensions have been checked against the project requirements and the applicable flange specification.
Should the listed dimensions be checked before ordering?
Yes. Confirm the flange standard, material, gasket, bolt requirements, pressure-temperature conditions, and mating connection before procurement or installation. Project specifications may impose additional requirements.