What Are The Types of Flange?

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In the world of piping systems, flanges play a imperative part in interfacing pipes, valves, and other components safely and proficiently. These flexible components come in different sorts, each outlined to meet particular necessities and working conditions.

Definition of a Flange:

A flange is a circular component with a raised confront and a arrangement of jolt gaps around its circumference. It is utilized to interface channels, valves, and other hardware in channeling frameworks, making a secure and leak-proof joint. They are outlined to withstand different working weights, temperatures, and natural conditions, guaranteeing the secure and solid transportation of liquids or gases.

Weld Neck Flange (WNF)

Weld neck flanges are characterized by their particular decreased center or neck that projects from the flange face. This decreased center is planned to be welded specifically to the pipe, making a smooth move between the pipe and the flanges. The decreased plan makes a difference to diminish turbulence and stretch concentrations, minimizing the hazard of disintegration and weakness failures.

Weld neck flanges are broadly utilized in high-pressure and high-temperature applications, such as oil and gas, chemical preparing, and control era businesses. Their strong development and smooth push conveyance make them an great choice for requesting working conditions.

Raised Confront: these flanges regularly have a raised confront on the its surface, which gives a fixing surface for the gasket and guarantees legitimate arrangement with the mating flange. The raised confront plan makes a difference anticipate spillage and gives a dependable seal in high-pressure applications.

Bore Breadth: The bore distance across of a weld neck flange matches the inward distance across of the pipe, guaranteeing smooth stream and minimizing weight drop over the flange association. The exact bore distance across makes a difference keep up the astuteness and productivity of the piping system.

Butt Weld Association: Weld neck flanges are welded to the pipe utilizing a butt weld joint, which includes welding the neck of the flange to the conclusion of the pipe. This makes a solid and leak-resistant association that can withstand tall weights and temperatures.

High-Strength Fabric: these flanges are ordinarily made from high-strength materials such as carbon steel, stainless steel, or amalgam steel, depending on the application prerequisites. The fabric determination is basic to guarantee the flange can withstand the working conditions and give long-term unwavering quality.

Slip-On Flange (SOF)

Slip-on flanges, as the name suggests, are designed to slip over the pipe end. These flanges feature a straight bore that fits over the pipe, and they are typically welded at the pipe end and the flange’s backside. Slip-on flanges are a cost-effective option for low-pressure and low-temperature applications.

While slip-on flanges do not offer the same level of strength and integrity as weld neck flanges, they are widely used in various industries due to their ease of installation and maintenance.

Socket Weld Flange (SWF)

Socket weld flanges are designed for smaller diameter pipes, typically ranging from 1/2 inch to 2 inches. These flanges feature a socket that is welded directly onto the pipe end, creating a strong and secure connection.

Socket weld flanges are commonly used in instrumentation and control systems, as well as in low-pressure and low-temperature applications where space constraints are a concern.

Other Types of Flanges:

While weld neck, slip-on, and socket weld flanges are among the most common types, there are several other flange types available to meet specific application requirements:

Threaded Flange: Threaded flanges have internal threads that match the external threads of the pipe, allowing them to be screwed onto the pipe end. They are commonly used in low-pressure, non-critical applications where ease of installation is important.

Blind Flange: Blind flanges are solid discs used to close off or seal the ends of piping systems, valves, or pressure vessels. They do not have a bore and are typically used for pressure testing, isolation, or temporary closure purposes.

Lap Joint Flange: Lap joint flanges consist of two separate components: a stub end and a loose backing flange. The stub end is welded to the pipe, while the backing flange slides over the pipe and is free to rotate, allowing for easy alignment during installation.

Orifice Flange: Orifice flanges are specially designed to accommodate orifice plates for flow measurement or control purposes. They feature a recessed bore with specific dimensions to hold the orifice plate securely in place.

Expander Flange: Expander flanges are used to increase the bore diameter of the piping system without the need for extensive modifications. They feature a larger diameter on one side to accommodate larger pipes or equipment.

Reducing Flange: Reducing flanges are used to connect pipes of different diameters in a piping system. They feature a larger diameter on one side and a smaller diameter on the other, allowing for a smooth transition between pipes.

Swivel Ring Flange: Swivel ring flanges are designed to rotate or swivel around a pipe joint, providing flexibility and allowing for easy alignment of bolt holes during installation.

These are some of the most common types of flanges used in piping systems, each with its own unique design, features, and applications. The selection of the appropriate flange type depends on factors such as pressure, temperature, pipe size, material compatibility, and system requirements.

Flange Manufacturer

Hebei Pengrun Pipe Fittings Co., Ltd. is a renowned manufacturer of pipe fittings and flanges, with over 20 years of experience in the industry. The company is a stockist of carbon steel pipes from highly qualified vendors, ensuring quality and compliance with ISO 9001 internal audit standards.

If you are in search of a reliable flange supplier, Hebei Pengrun Pipe Fittings Co., Ltd. is a trusted choice. You can contact them at Lucy@pr-pipefittings.com for inquiries, quotations, or further information about their products and services.

When selecting the appropriate flange type for your piping system, it is crucial to consider factors such as operating pressure, temperature, fluid characteristics, and installation requirements. Each flange type offers unique advantages and limitations, and choosing the right one can ensure the safe and efficient operation of your piping system while minimizing the risk of leaks, failures, and potential hazards.

By understanding the different types of flanges and their applications, engineers and professionals can make informed decisions and design piping systems that meet the highest standards of safety, reliability, and performance.


1. ASME B16.5: Pipe Flanges and Flanged Fittings (American Society of Mechanical Engineers)

2. EN 1092: Flanges and their joints (European Standard)

3. “Piping Handbook” by Mohinder L. Nayyar (McGraw-Hill Education)

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Lucy yang

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