... Radius or Semi-major Axis R is equal to 1.5D; Short Radius is equal to D.2. According to Pressure Grade:Sch5s,Sch10s,Sch10,Sch20 ... ,Sch60,Sch80s,XS;Sch80,Sch100,Sch120,Sch140,Sch160,XXS3. According to degree: 45,90,180 as LR STD 90 sch84. SH3406 ...