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Flange Forging

Quality Forging of Flange For Industrial Use

Forged flanges are used as a linking part to create a pipework network for cylinders, valves, pumps, and other devices. Forged flanges incorporate two different sections of the machinery. To render the entity stronger, it should be an attachment to a frame. Industrial flanges have several uses including connecting sheets, pumps, pipes, and structures that explicitly need an intermediate connection point. Flanges are normally welded onto pipes or mounted onto a threaded end of the shaft, and then connected to allow contact with bolts and a gasket in between to provide a seal.

Types of Flanges


Slip-on pipe flanges are shorter in length than the weld neck flange so can be used where there is space constraint. The inside diameter of slip-on flanges is slightly larger than the pipe OD and so it can slide over the pipe. They are secured to the pipe using two fillet welds from inside and outside. The Slip-on type of flange is widely used in lower temperatures and pressure applications because of its low initial cost. However, their life span is around one-third that of the weld neck flange.


A lap joint flange is basically a two-component flange assembly. It has a stub end and a backing lap-joint ring flange. A pipe is butt-welded to the Stub End and the Lap Joint is free to rotate around the stub end. The face of the stub end acts as a raised face of the flange and can be of different materials to save cost. Only the stub end comes in contact with the fluid.


A blind flange is a solid flange and without the central hole used to seal or block off a section of pipe or a nozzle on equipment that is not used. Blind flanges are designed robustly as they have to withstand remarkable pressure stress. However, they don’t have to absorb thermal stresses as they are free to expand as attached at the end of the piping connection. They are frequently used during pressure testing of piping systems. Blind flanges can be of Flat or Raised Face type.


Socket weld flanges use only one fillet weld on the outer side of the flange. As per ASME B31.1, in a socket weld flange connection, the pipe is inserted in the socket at first until it reaches the flange bottom and then it is lifted by 1.6 mm and finally fillet welded. Socket Weld Flanges are suitable for small-size pipes (up to 2″) and are not recommended for severe services. They can be used for high-pressure piping that does not transfer highly corrosive fluids as fluid accumulation inside the gap will easily corrode the pipe.


Threaded flanges are joined to pipes by screwing the pipe are used on piping systems that prohibit direct welding on the pipe. Usually, threaded flanges are used for Galvanized Piping. Industrial Threaded flanges are made in sizes up to 4 inches with various pressure ratings. Their use is mostly limited to small pipe sizes carrying low-pressure temperature fluids.


A weld neck flange also called a tapered hub flange or high-hub flange is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. There are two welding neck flanges designs – the first type is used with wipes while the second, longer type cannot be used with pipes but with a process plant. The weld neck flange comprises a round fitting that extends beyond the rim of the circumference. These flanges, typically manufactured from forging, are actually welded to pipes.


Tongue & Groove Flanges means in flange the one with the raised face is called a tongue and the other end is called a groove. The advantage of this is self-aligning and acts as a reservoir for the adhesive. It is a method of fitting similar objects together and is mainly used with wood, flooring parquetry, paneling, and similar constructions. The tongue and Groove faces of the flange must be matched. This is mostly used in plumber tool companies, construction companies, and many more.

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