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Product Description

A blind flange is a type of pipe flange used to seal the end of a piping system, pressure vessel, or valve opening. Unlike standard flanges, it does not have a bore (center hole), making it ideal for isolating or terminating pipelines.
Key Features of Blind Flanges
  • 1
    Solid Design – No internal opening, providing a tight seal.
  • 2
    Pressure Containment – Withstands high pressure, preventing leaks.
  • 3
    Easy Installation & Removal – Used for maintenance, inspection, or future expansion.
  • 4
    Material Variety – Available in carbon steel, stainless steel, alloy steel, and other materials.
  • 5
    Standards Compliance – Manufactured to ASME/ANSI, API, DIN, EN, and other international standards.
Common Applications
✔ Pipeline Termination
Seals the end of a pipe system.
✔ Pressure Vessel & Boiler Access
Allows inspection or cleaning.
✔ Isolation During Maintenance
Blocks off sections for repair.
✔ Future Expansion
Temporarily seals unused connections.
Types of Blind Flanges
Type Description
Flat Face (FF) Smooth sealing surface, used with flat gaskets.
Raised Face (RF) Slightly raised surface for better sealing.
Ring-Type Joint (RTJ) Uses a metal ring gasket for high-pressure applications.
Threaded Blind Flange Has internal threads for screwing onto pipes.
Standards & Specifications
  • ASME B16.5 (Standard for pipe flanges up to 24")
  • ASME B16.47 (Large-diameter flanges)
  • API 6A (For wellhead & Christmas tree equipment)
  • EN 1092-1 (European standard)
Why Choose a Blind Flange?
✅ Safety
Prevents unwanted flow or pressure release.
✅ Versatility
Suitable for oil & gas, chemical, water, and industrial systems.
✅ Cost-Effective
Simple design with long service life.
Frequently Asked Questions (FAQ)
Q: What is a blind flange?

A: A blind flange is a specialized pipe flange without a center hole (bore), designed specifically to seal off the end of a piping system, pressure vessel, or valve opening.

Q: What are the key features of blind flanges?

A: Key features include a solid design for tight sealing, high pressure containment, easy installation/removal for maintenance, wide material selection (carbon, stainless, alloy steel), and international standards compliance.

Q: Where are blind flanges commonly applied?

A: They are widely used for pipeline termination, pressure vessel and boiler access, system isolation during repair/maintenance, and sealing connections intended for future expansion.

Q: What surface types are available for blind flanges?

A: Main types include Flat Face (FF), Raised Face (RF), Ring-Type Joint (RTJ) for high pressure, and Threaded Blind Flanges with internal threading.

Q: Which manufacturing standards do blind flanges conform to?

A: Blind flanges are produced according to major international specifications, including ASME B16.5, ASME B16.47, API 6A, and EN 1092-1.

Q: Why should I choose a blind flange for my system?

A: Blind flanges offer reliable safety against leaks, high system versatility across oil, gas, and chemical industries, and a cost-effective design with durable service life.

Mila

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