In industrial piping systems, beyond the common flange types, there exists a group of “special flanges” designed for highly specific technical applications. These flanges are less commonly encountered but are critically important in systems that operate under demanding pressure, temperature, or measurement requirements. They are typically found in sectors such as oil & gas, chemical processing, power generation, marine engineering, and high-spec industrial facilities.
Below is an overview of the key special flanges used in industrial piping systems.
1. Orifice Flanges
Orifice flanges are designed to accommodate orifice plates used for flow measurement and control. They feature small radial tap holes to allow pressure gauges or sensors to monitor differential pressure. These flanges are essential in systems requiring precise flow measurement, including power plants, chemical processing units, and industrial water systems.
2. Spectacle Blinds
Spectacle blinds consist of a solid plate on one side and an open ring on the other, connected by a handle. They serve as a mechanical flow stop or pass-through device, enabling maintenance or isolation without fully removing the piping connection. They are typically installed in fixed positions and manually rotated as needed.
3. Long Welding Neck Flanges
Long welding neck flanges are equipped with an extended neck that is butt-welded directly to the pipe or pressure vessel. This design helps distribute stress more evenly and improves thermal expansion resistance. They are ideal for use in high-pressure systems, boilers, and critical pressure equipment.
4. Weldoflange / Nipoflange
Weldoflanges and Nipoflanges combine a standard flange with a branch fitting, such as a weldolet or nippolet. These are used to create branch connections without separate fittings, helping to reduce space usage and streamline installation in compact or complex systems.
5. Expander Flanges
Expander flanges allow for an increase in pipe diameter at the connection point. They eliminate the need for a separate reducer fitting and are commonly installed at pump inlets or points where flow transitions from smaller to larger pipe sizes.
6. Reducing Flanges
Reducing flanges do the opposite of expander flanges—they connect larger pipes to smaller ones. They save space and help maintain flange alignment and sealing performance without additional components like reducers or adaptors.
7. Groove and Tongue Flanges
Groove and tongue flanges have mating surfaces with one flange featuring a raised ring (tongue) and the other a matching groove. This configuration enhances gasket alignment and ensures a tighter seal, especially under high temperature and pressure conditions. They require precise machining and dedicated gaskets.
Sunjin Metals Vina – Trusted Supplier of Imported Special Flanges
As industrial projects in Vietnam continue to adopt more stringent engineering standards, the demand for specialized flanges has grown significantly. These flanges are typically not manufactured locally and must be imported from reputable sources such as South Korea, Japan, or the European Union.
Sunjin Metals Vina (SJM Vina) is proud to offer a full range of steel pipes, flanges, and piping fittings imported from South Korea, including the special flange types listed above. All products are accompanied by full certifications and technical documentation, ensuring suitability for high-demand industrial and infrastructure projects.
Contact Information:
Sunjin Metals Vina (SJM Vina)
Address: 628 Le Hong Phong, Ward 10, District 10, Ho Chi Minh City, Vietnam
Hotline: +84 33 4233 127
Email: sjmvina@sunjinmetal.com
Website: www.sjmvina.com.vn
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