19,Jul 2024
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After welding, flanges are the second most dependable method of joining pipes. Valves are considered to be the most dependable approach. Flanges provide systems with more adaptability and facilitate component access and disassembly for maintenance.
Common Types of Flanges
Depending on the needs of the location, there are many flange kinds to choose from. Assure dependable performance, an extended service life, and competitive cost for the perfect flange. To see the most popular flange types, scroll down.
The thread within the bore of these flanges, sometimes called screwed flanges, matches the male thread on the fitting. Welding is often not necessary with this threaded connection. The threading on the pipes being placed is what primarily connects them.
Smaller pipes in low-temperature and low-pressure environments usually employ these flanges. Securing the pipe using a single or multiple-pass fillet weld ensures it fits within the flange. Unlike other welded flanges, this one avoids the constraints of threaded ends, making installation simpler.
In order to produce a flanged connection, a lap joint flange involves butt welding a stub end to a fitting. The fitting then joins with a backing flange. Because of its architecture, it is well-liked for systems that need a lot of maintenance or regular disassembly.
Slip-on flanges are widely available and come in a variety of sizes to manage systems with high flow rates. When the flange and pipe’s outside diameter match, they are simple to install. But installing it takes some expertise since you have to use fillet welds on both sides to attach the flange to the pipe.
It is usual practice to terminate pipe networks using blind flanges. They resemble boltable blank discs in form. They provide a great seal that is simple to remove when necessary when placed appropriately with the appropriate gaskets.
Lap joint flanges and weld neck flanges are comparable, yet installation requires butt welding. They are an excellent option for process pipes because of their dependable performance, resistance to repetitive bending, and compatibility with high-pressure and high-temperature systems.
Specialty Flanges
This kind of flange is quite typical. For various applications and settings, there are several speciality flange types available. Nipo flanges, neck flanges, weldo flanges, orifice flanges, decreasing flanges, long weld and expanding flanges are among the available options.
Unlike Nipoflanges, which fuse separate sections together, a Weldoflange includes a weld neck flange and a branch fitting connection, all manufactured from a single piece of solid forged steel.
Nipoflanges are 90-degree branch pipes that combine a forged Nipolet and a welding neck flange into one seamless piece of forged steel. Installing involves bolting the flanged portion to the branched pipe and welding the Nipolet portion to the run pipe.
Whereas Latroflanges combine a flange with a Latrolet, Elboflanges combine a flange and an Elbolet. To branch a pipeline at a 45-degree angle, utilize elboflanges.
Swivel ring flanges are helpful in large-diameter pipelines, subsea or offshore pipelines, and comparable situations because they align bolt holes between two matching flanges. Applications involving hydrocarbons, water, chemicals, oil, and gas are suitable for them.
Expanding flanges, also known as expander flanges, enlarge a pipeline’s bore to facilitate the connection of pipes to equipment such as pumps, compressors, and valves that have varying input sizes.
Reducer flanges, also known as reducing flanges, lower a pipeline’s bore. They are able to lower the bore by one or two sizes; larger reductions need the use of a butt weld reducer in conjunction with a standard flange.
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