A flange is an integral part of pipe fittings to connect piping or other equipment, such as valves, pumps, etc., to industrial systems. In India, the flanges are manufactured from raw materials with a strong base in the steel industry, along with the engineering talents to support the production of flanges. The manufacturing process generally starts with the selection of material (i.e.CS, SS or alloy grades) based on the intended application. To produce a high-strength flange, forge processes of heating and shaping, with the required pressure, are usually employed so that the resulting perfomance will be the best possible for mechanical characteristics. Following forge or casting, the next step in the manufacturing process is to machine the flange, which includes turning, drilling and facing to produce tolerances and surfaces that conform to required specifications. Flanges are heated in furnace to improve stregth and longevity. The heat treatment process may include annealing, normalization, quenching and tempering.Then, the manufacturing process finishes with strict quality control checks on the finished flanges. Quality control checks include dimensional inspections, non-destructive testing (e.g. ultrasonic testing) and/or pressure testing. Also included in the quality control checks are surface treatments that prevent corrosion or provide a desirable surface finish to the uncoated flanges.
Types of Flanges Manufactured in India
Forged flanges India is a broad selection of flange types that comply with both national and international industry benchmarks which include ANSI, ASME, DIN and IS. The following are some of the common types of flange manufactured in India;
- Weld Neck Flanges - Best suited to high pressure & high temperature applications.
- Slip-On Flanges - Easily installed & the most prevalent type of flange used on low pressure applications.
- Blind Flanges - Used for the closure of pipe ends in piping systems.
- Socket Weld Flanges - Best suited for use on small diameter high pressure piping.
- Threaded Flanges - Used where welding is not an option.
- Lap Joint Flanges - Used with stub end connections for frequent disconnection of piping systems.
- Orifice Flanges - Flanges that were designed specifically for use on flow measuring systems.
Flanges manufactured in India are produced in accordance with both standard and custom specifications for the oil and gas, power generation, petrochemical and infrastructure industries.
Applications and Uses of Flanges in Indian Industries
In several industries in India, flanges are very important. For example, in the oil & gas industry, flanges connect pipelines used to transport crude oil, natural gas, and refined products. In power generation, flanges are used within boiler systems, turbines, and cooling systems. Similarly, flanges are used in the chemical and petrochemical industries for handling corrosive and/or highly pressurised reactions. In addition to these industries, many other types of industries, such as pharmaceuticals, food processing, shipbuilding, and construction also rely on flanges to create strong and leak-free connections between two pipes. The fact that flanges make it easy to assemble/disassemble means that maintaining and inspecting equipment is much more efficient than if they were not present.
Why Forged Flanges are Preferred Over Cast Flanges
Forged flanges are more reliable and functional than cast flanges because they have greater strength overall. The reason for the higher strength of forged flanges than cast flanges is that forging produces a finer grain structure in the metal so that forged flanges have better mechanical properties than cast flanges; for example, forged flanges have higher tensile strength, greater impact resistance, and greater fatigue resistance. Thus, forged flanges are better suited for extreme use (high-pressure and high-temperature applications). On the other hand, the casting process of cast flanges can cause a variety of internal defects like porosity, shrinkage, and inclusions, which can negatively affect the integrity of the casting and create a point of failure when the load is applied to the casting. In comparison to castings, forged flanges have better dimensional accuracy than cast flanges, and due to their smoother surface finish as compared with cast flanges, there is less chance of any leakage occurring from forged flanges. Forged flanges are also typically more cost-effective because they have a longer service life and require less maintenance than cast flanges, even though they may cost more upfront.
Conclusion
In India, forged flanges manufacturers are responsible for providing essential support to key industries including energy, infrastructure and manufacturing industries through their manufacturing capabilities. Indian producers offer high-performance flanges using advanced processing methods and stringent quality control procedures thereby ensuring an adequate supply of such flanges to both domestic and global markets. The type of flange most commonly purchased by end consumers in these sectors is known as a "forged flange" because of its superior performance relative to other types of flanges with respect to strength, reliability and quality. Therefore, forged flanges will provide the highest level of performance when used in high-demand industrial sectors.
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