This Blind Flange 16 Inch Class 300 reference brings the key dimensional and installation details together for piping engineers, drafters, fabricators, and maintenance teams. Use the local dimension list as the primary reference for flange thickness, weight, stud bolts, bolt count, and hole diameter.
The page also explains how to interpret a blind flange in a piping layout and provides a CAD download for drafting and coordination. Before ordering or installing, compare the listed data with the project specification, material requirements, gasket selection, and pressure-temperature conditions.
Blind Flange 16″ Class 300
Blind Flange 16″ Class 300 is used to seal the end of a piping system or close off a flange connection in Class 300 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 higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 16″ Class 300 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 16″
- DN Size: DN400
- Flange Thickness: 55.6mm
- Weight: 134kg
- Stud Bolt Size: 1 1/4″ UNC (or M33) x 190 Long
- Number of Bolts: 20
- Hole Diameter: 1 3/8″ (34.925mm)
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 300 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 16″ Class 300, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 300 Sizes
This size is part of the Blind Flange Class 300 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 bore, so it closes a flanged connection rather than connecting one pipe bore to another. In a drawing, it is typically shown at a pipe end, equipment nozzle, valve connection, or other point that may need isolation or later access.
The dimension list identifies the nominal pipe size and DN designation, then provides the flange thickness and weight for reference and planning. The bolt information should be read together: the stud bolt size and length, number of bolts, and hole diameter affect bolting coordination between the blind flange and its mating flange.
Drafting and procurement checks
- Confirm that the nominal size and Class designation match the mating flange and the project piping specification.
- Use the supplied DWG as a drafting aid, then verify drawing units, mating-face details, and project-specific requirements before fabrication.
- Check the selected gasket, facing arrangement, fastener specification, and required bolt engagement with the responsible engineer or fabricator.
- Do not treat the Class designation as a complete pressure qualification by itself; material, temperature, gasket, assembly, and project requirements also need review.
Useful related PipeSTD references can include Class 300 flange dimensions, blind flange sizes, flange facing terminology, gasket selection, and stud bolt and nut references. Linking these topics helps readers compare mating components without confusing a blind flange with a weld neck, slip-on, or threaded flange.
Why the CAD File Matters
The downloadable DWG can support preliminary layout, equipment coordination, spool drafting, and detailing. Treat it as a reference resource rather than a substitute for the approved project drawing, fabrication standard, or dimensional inspection requirement.
Frequently Asked Questions
What is a blind flange used for?
A blind flange closes the end of a pipeline, vessel nozzle, valve connection, or other flanged opening. It can provide an isolation point and may allow future maintenance, inspection, or line extension.
Does this blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, which is what allows it to blank off the connected opening.
What should be checked before ordering the flange?
Confirm the nominal size, Class designation, flange material, gasket type, stud bolt requirements, mating flange details, and applicable pressure-temperature rating against the project documentation.
Can the DWG be used directly for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. Fabrication should follow the approved project drawings and verified dimensional, material, and inspection requirements.
Is the Class 300 designation sufficient to select the flange?
No. The Class designation must be considered with the flange material, service temperature, gasket and bolting arrangement, applicable specification, and project pressure-temperature requirements.