法兰的厚度怎么在图纸上看

C就是厚度，厚度是包括台阶的

根据设计管道的压力选择，安装图纸一般不会告诉厚度；下图可以参考
HG20593-97PN0.6PN1.0PN1.6PN2.5公称通径法兰厚度理论重量法兰厚度理论重量法兰厚度理论重量法兰厚度理论重量10120.36140.61140.61140.6115120.41140.68140.68140.6820140.6160.94160.94160.9425140.73161.12161.12161.1232161.19181.86181.86181.8640161.38182.12182.12182.1250161.51202.77202.77202.7765161.85203.31203.31223.4680182.94203.59203.59244.31100183.41224.57224.57266.29125184.08225.65225.65288.5150205.14247.61247.613010.8200226.85269.69269.693214.2250248.962813.82813.83520.23002411.93218.93218.93826.53502614.33524.73524.74237.64002817.13832.13832.14650.74503020.54240.54240.55057.85003223.74657.64657.65676.26003633.75288.25288.268117

看剖面图上有标注，若没有，按常规找图集。