How to classify stainless steel elbow according to their pressure level?

　　There are about seventeen kinds of pipe standards, which are the same as those in the United States. They are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS. The most commonly used are STD and XS. According to the angle of stainless steel elbow, there are ANSI B16.9 45 Degree Seamless Pipe Fitting Stainless Steel Elbow, 90 degree elbow and 180 degree elbow. In this way, there are many kinds of stainless steel elbow.

　　Orders are often expressed as follows: for example, "LR STD 90 8", which means long radius, pressure level of STD, 8"elbows of 90 and for example,"SR XS 45 4"which means short radius, pressure level of XS, 45" elbows. The above is the general classification of stainless steel elbow. There are generally two kinds of stainless steel tee. The three outlets with the same diameter are equal diameter tees with the same diameter at both ends, but the diameter of the confluence end is different from the other two diameters.

　　Representation is as follows: For equal-diameter tees, such as "T3" tees, the outer diameter is 3 inches of equal-diameter tees. For different-diameter tees, for example, "T4 *4 *3.5" means a different-diameter tee with the same diameter of 4 inches and the different diameter of 3.5 inches. Pressure level and stainless steel elbow pressure level are the same, its specification range is the same.