Manufacture and inspection of stainless steel elbo

Manufacture and inspection of stainless steel elbows

In a piping system, a bend is a pipe fitting that changes the direction of the line. According to the Angle, there are 45° and 90°180° three commonly used, in addition, according to the needs of the project also includes 60° and other abnormal Angle elbow. Elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics. The connection modes with the pipe are: direct welding (commonly used) flange connection, hot melt connection, electric melt connection, thread connection and socket connection, etc. According to the production process can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow and so on. Other names :90 degree bend, right Angle bend, love bend, etc.

Butt welding elbows save space, reduce weight, and more importantly, ensure that the joint site does not leak, with good sealing performance. The compact flange size is reduced by reducing the diameter of the seal, which will reduce the cross section of the sealing surface. Secondly, the flange gasket has been replaced by a sealing ring to ensure that the sealing face matches the sealing surface. The B value of 45 degree elbow is the structural size, mainly for the convenience of pipeline designers.

For manufacturing and inspection, the measurement of B value is not very convenient. There are two relatively simple methods to detect the B value. One is to use the common measuring tool for 45 degrees elbow to make 45 degrees Angle, and with the size value of each specification. When used, the butt welding elbow is placed in the tester; The other is to use a universal height caliper directly measured, and to convert the dimensions.