EQUIDIAMETER three is through both ends of the same diameter, diameter three is the branch and the other two different diameters called diameter three, said method is as follows: for size three, such as "T3" three general said outer diameter is 3 inches in diameter three. For a differential three pass, such as "T4 * 4 * 3.5", the same diameter is four inches, the diameter is 3.5 inches, and the diameter is three.

20# A3 Q235A made of 10# 20g 20G 16Mn ASTM A234 ASTM A105 ASTM A403, three, the diameter is in the range of 2.5 - 60 "", "" from 26 - 60 for welding three. Wall thickness 28 - 60mm.

The pressure levels are Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS, Sch80, Sch100, Sch120, Sch140, Sch160,, and XXS