Blind Flange

What is a blind flange?

A blind flange (also called a ‘closure plate flange’) is installed at the end of a piping system to terminate a pipe. It has no centre hole (bore), so there is no flow through the flange. A blind flange may be used for isolating a pipe, valve, or pressure vessel. This type of flange is available in all sizes and classes, and may use a flat, raised, or ring-type joint face.
A blind flange can replace a butt weld cap in case an extension of the piping line is required, or in case a piping inspection is required (remove the blind flange to access the pipe interior). This type of flange can also be used as the rod access point on drain systems. Depending upon the application, a blind flange may be drilled and used as a slip-on flange, or tapped and used as a threaded flange.

Despite its simplistic design, this type of flange is comparatively expensive.

The ASME B16.5 standard details the dimensions and tolerance requirements for blind flanges.

Ensure the safety and efficiency of your pipeline system with a high-quality blind flange. Designed to handle various pressure ratings and equipped with precision-engineered bolt holes, blind flanges provide a reliable seal for isolating sections, conducting maintenance, or testing.

Key features:

• Ensures a leak-proof, secure seal
• Compatible with slip-on or weld neck flanges
• Can be customized with NPT threads or central bore holes
• Available with raised face (RF), flat face (FF), or ring joint (RTJ) connections.
• Suitable for high-pressure and temperature applications

Common uses:

• Oil and gas industry: Isolating pipe sections for maintenance or expansion
• Water treatment plants: Closing inactive lines
• Chemical and pharmaceutical industries: Providing safe, hygienic seals
• Pressure testing: Sealing pipes during integrity checks
• Modular industrial systems: Allowing future pipe modifications
• Blind flanges are essential for durable, reliable, and flexible sealing in industrial piping system

The production process of blind flanges:

Explore Our Range of Industrial Pipe Fittings and Solutions

As a trusted steel pipe fittings and flanges manufacturer, RAYOUNG offers a comprehensive range of products engineered to meet international standards, including:

Standards Complied With:
ASME、ANSI，gost, EN, BS, SANS, DIN, JIS.
Material :
Carbon Steel (ASTM A105, A350 LF2)
Stainless Steel (ASTM A182 F304/F316)
Alloy Steel (ASTM A694 F42-F70)
Duplex & Super Duplex (ASTM A182 F51/F53/F55)
Nickel Alloys (Inconel, Monel, Hastelloy)
Coated flange:
General coated flange: Black Painting, Anti-rust Oil, red Painting, Gold Painting
Specially coated flange:Epoxy coated flange, Galvanized flange, PP coated flange

Production of every flanges follows precise manufacturing processes to achieve leak-proof connections while strengthening durability and performance stability with high-pressure systems.