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A flange is a circular iron ring with holes drilled around it . It is used to increase the strength and connection of the two objects . For example , the connection of the ends of the tubes , the steam cylinder and the train wheels are made off the flange . Therefore, flanged wheels are wheels that have a flange on one side so that the wheels do not move away from the rails. The term " Phalange " is also used for a kind of tool that is used to form a flange , as well as the flange tubes can be easily assembled and removed .
As the name implies, this welded flange has a conical neck and its radius is equal to the diameter of the pipe. This type of flange is designed for very high pressure or very low temperatures . Gentle transfer from the flange opening to the pipe by the cone is very useful in the case of repeated bending due to expansion or other variable forces. These flange conform to the inner diameter of the pair or connections , so there is no restrictions on the product flow .
The calculated power of the surface pressure flange under internal pressure is about two thirds of the neck welded flanges . The flange attached to the tube through holes in it is carried out by welding outside and inside the flange. One disadvantage of flanges is that they always have to be welded to a pipe first and then welded to the joints. This type of flange has two parts of the bent end and a free back . The flange on the back is usually made of carbon steel.
Socket flanges are designed for use in small pressure pipelines. It has the same static resistance as surface flanges, but their body strength is 50% higher than double-welded surface flanges. The connection is carried out in the outside flange but before the welding , there should be a space between the flange or connections and the tube .
Prior to welding, pipes or fittings should be placed in the socket as much as possible . The disadvantage of this flange is the gap that must be created by corrosive products, mainly in stainless steel pipe systems, in the gap between the pipe and the flange can cause problems such as corrosion.
Edged flanges have the same dimensions as other flanges but do not have a prominent face . These flanges are almost identical to the surface flange except that the radius at the intersection of the flange face is made different from the surface flange. The ability to hold pressure in edge flanges is less than in surface flanges . Edged flanges may be used at all pressures, but these flanges are not welded to the pipe and are not fastened to them. Instead, the bolt pressure is transmitted to the washer by the flange pressure behind the pipe.
The bottom flange is always used with the edge flange as the back flange . These connections are used in low - pressure and non - critical applications and is a cheap method . For example , stainless steel tubes can be used as a flange of carbon steel because they don 't contact the product in the tube . Bottoms are also available in almost all diameters.
string flange are used for certain conditions and their main advantage is that they can be connected to the tube without welding . Welding with a threaded connection is sometimes used. Although still available in most sizes and pressure ratings, screw fittings are now used almost exclusively in smaller pipe sizes. The flange or flange joints for the pipe system are not suitable for thin - walled tube thickness . Because it is not possible to cut the tube . Thus , the thicker wall thickness must be selected .
The flange can also be a plate or loop that forms an edge when connected to a pipe at the end (for example, a cupboard flange). A blind flange is a plate to cover or close the end of a pipe, where the connecting parts have a flange and by which the parts are twisted together. Although the word flange generally refers to the edge or protrusion of the fittings, many flange fittings themselves are known as "flanges". Common flanges used in plumbing are Syrian flange or Danzi flange, York flange, Sussex flange and Essex flange. The Syrian and York flanges are located at the top of the hot water tank and allow water to flow into the tank without interruption. They are often used to ensure uniform flow of water and the Essex flange also has a hole in the tank to use a hole in the tank . There is also a varicose flange, which is the same as the York flange, but the shower outlet is at the top of the flange. York and Varix flanges have adapters so that they fit on a tank.
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