Large flange as a sealing and fastening connection parts, installation is simple, flexible, long life, in the field of aerospace and petroleum, chemical and other large containers have a wide range of applications.
First of all, the large flange connection of the weld to go through 100% of the ultrasonic or radiographic testing. There is no crack or other defects on the surface of the large flange plate to reduce the flange connection or strength. Length to diameter of the flange. In working pressure is equal to or greater than 0.8 times the standard provisions of the maximum allowable working pressure and large flange and pipe welding seam to were 100% X-ray inspection.
If the pressure vessel pattern of the large flange is not satisfied with the requirements of the container shell, it is required to be implemented according to the contract or marked in the drawing.
Source: Yaang Pipe Industry Co., Limited (www.yaang.com)