Types of flanges based on their shape according to ANSI. What needs to be explained in this case is the type of flange based on its shape according to ANSI. Because this is the main point that must be known by someone who works as a fitter or pipe fitter. It doesn't mean that the others aren't important, but after knowing the shape, then seeing what ANSI or schedule is. Based on ANSI (American National Standards Institute), flange types are distinguished as follows: Blind Flanges Blind flange which has a function to close the flow. As well as the function of the cap in the fitting. This type of flange is flat and not perforated. This is because it serves to close. Socket Flanges (Socket type flange) Socket Flange is a flange that has a resistance on the outer side. This causes the pipe that is inserted into it can not penetrate out. Slip On Flanges (Flanges slip on type) In slip on, the flange can only partially enter. On the outside and inside will be done welding. Therefore, the inside diameter of the slip on flange must be larger than the outside diameter of the pipe. Weldneck Flanges (Weldneck type flange) This type of flange is most widely used in a plant. This is because it is easy to connect with pipes. In addition, this flange can be used for low pressure and temperature, as well as for high pressure and temperature. Lap Joint Flanges ie this type of flange can be rotated in the position of the bolt hole. This type of flange is not recommended for high pressure. Threaded Flanges As the name suggests, this Threaded Flanges has a connection type that uses threads. Usually this flange is used for systems that are very prone to fire when using welding.