... pipe:O.D.:9.5,12.7,15.9,17,18,19.1,20,21,22,23,25.4,28,31 ... . Square pipe:Side length:10*10,12*12,15*15,18*18,19*19,20*20,22*22,23*11,24*12 ... ≤0.06≤0.06≤0.06≤0.08≤0.12≤0.03≤0.03S≤0.02≤0.02≤0.03≤0.03≤0.03≤0.03≤0.03≤0.03P≤0.075≤0.06≤0.045≤0.035≤0.045≤0 ... .04≤0.045≤0 ...