This reference provides dimensional and drafting information for a Blind Flange 14 Inch Class 1500. Use the listed data when reviewing piping layouts, flange details, equipment connections, and procurement documents.
A blind flange has no center bore, so it closes a flanged connection rather than connecting two pipe bores. The source data below identifies the nominal size, DN designation, thickness, weight, bolt arrangement, stud information, and hole diameter for this flange entry.
For related design work, compare this page with the site’s references for flange dimensions, piping terminology, bolt and gasket selection, and CAD/DWG piping details. Those references can help keep the flange schedule, fabrication drawing, and installation documents consistent.
Blind Flange 14″ Class 1500
Blind Flange 14″ 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 14″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 14″
- DN Size: DN350
- Flange Thickness: 133.4mm
- Weight: 443kg
- Stud Bolt Size: 2 1/4″ UNC (or M56) x 405 Long
- Number of Bolts: 16
- Hole Diameter: 2 3/8″ (60.325mm)
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 14″ 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 14″ 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 Use This Blind Flange Reference
The dimensional list should be read together with the applicable project specification and the flange standard identified in the source content. The nominal pipe size and DN designation are size references; they should not be treated as a direct measurement of the flange outside diameter or opening.
The flange thickness and weight are useful for layout review, material handling, support coordination, and checking whether a drawing reflects the intended component. Weight may also matter when planning lifting, temporary supports, and equipment-access clearances. Confirm how the project treats coating, facing, hardware, and other additions when preparing a material takeoff.
Understanding the Bolt Information
The listed stud bolt size, length, bolt count, and hole diameter describe the bolted connection shown for this flange entry. The stud designation and the hole diameter are different pieces of information: the first identifies the intended fastener specification, while the second describes the clearance opening through the flange. Do not substitute a different fastener system merely because its nominal designation appears similar.
Final bolt length can depend on the mating flange, gasket thickness, washers, facing arrangement, and required thread engagement. Confirm the complete joint stack-up before ordering hardware. Installation should also follow the project’s tightening procedure and any applicable engineering requirements.
Checks Before Fabrication or Installation
- Verify the mating flange class, nominal size, facing, and material specification.
- Confirm that the gasket type and dimensions match the joint and service requirements.
- Review the pressure-temperature rating using the applicable material and project specification.
- Check bolt availability, thread form, length, washers, and required engagement.
- Coordinate the flange with pipe supports, access space, valves, nozzles, and maintenance clearance.
- Use the downloadable DWG as a drafting aid, then verify the drawing against the approved project documents before fabrication.
The Class 1500 designation identifies a pressure class, not a universal allowable pressure for every service. The permitted rating depends on factors such as material, temperature, facing, joint configuration, and the governing project requirements.
Frequently Asked Questions
What is a 14 inch Class 1500 blind flange?
It is a solid, no-bore flange used to close a flanged piping, equipment, or nozzle connection. This page provides the source dimensions and connection details for the listed nominal size and pressure class.
Does a blind flange have a center opening?
No. A blind flange is a blank closure. Its bolt holes allow it to attach to a mating flange, while the solid body blocks the connected line.
Are the listed bolt size and hole diameter the same thing?
No. The bolt information identifies the specified stud arrangement, while the hole diameter describes the opening in the flange. Both should be checked when selecting compatible hardware and reviewing a fabrication drawing.
Can the DWG file be used directly for fabrication?
The DWG is intended for drafting, detailing, and layout coordination. Before fabrication, verify the drawing against the approved standard, material specification, gasket and bolting requirements, and project-controlled dimensions.
What should be confirmed before installing this flange?
Confirm the mating flange, facing, gasket, material, pressure-temperature requirements, bolt stack-up, tightening procedure, and access for future maintenance. Engineering or project approval is required where the connection affects system safety or pressure containment.