Flanges – Something very useful yet only a handful of people knows about them. It is used to connect two pipes or tubes or link a pipe to other components like choke, valve and more. To a layman, a flange is two plates bolted or welded on to each other and then connected with a pipe on each end with a gasket in the middle. You might not realize it but flanges are all over the world, they are used during construction of a house to building the public gas and drinking water supply. They are sold in different shapes, sizes, and quality; however, you can’t really divide them in terms of shape. To solve the problem, we have to uncover different members of the flag family-
A Slip-on flange is possibly the most common type of flange out in the market. This flange is generally welded from both the inside and the outside. Its diameter is slightly larger than that of the pipe so that it can easily slip over it. A slip-on can be available in many variations, as a flat face flange or one with a slight lift in the inner circle. Its small, easy to use, and rugged enough to endure different conditions without tampering the rigidity of the pipes.
This particular type is a lot similar to a slip on. The only point of difference is that a Threaded flange can be mounted on the pipe without welding. There is a thread on the inside of the flange where the pipe could be bolted in. It’s ideal for small pipes where welding poses great danger.
Lap Joint Flange-
You can say a Lap joint flange juncture is an amalgamation of Flat face sip on and slightly lifted slip on. The flat face in the back is used to insert a stub end for more support. A lap joint does a great job in securing the juncture, especially when its forged form an expensive metal.
Weld Neck Flanges-
A weld neck flange is visually the most different looking flange. It has a welding neck mounted right onto the back of the flange. This flange is welded to the base pipe which overlaps with the neck’s radius without any anomaly. This is an ideal flange for pipes containing high pressure as there is less stress on the flange joints.
Unlike other flanges, a blind flange is not used to support or join 2 pipes but to end the pipe. Practically it’s a solid piece of metal with no inner opening which is mounted onto the end of the pipeline. Generally, there is a little lip upliftment equal to the pipe’s radius.
There are a number of Flange manufacturer selling the same thing, you need to thoroughly asses yours. Make sure the flange is not porous, it should be hard metal and heavy according to the pipe’s weight and size. Speaking of sizes, your flange must not be smaller or larger than pipe as it will disrupt the free flow of pipes.