平焊法兰理论重量表 DN?0.25MPa?0.6MPa?1.0MPa?1.6MPa?2.5MPa100.360.360.610.610.61150.410.410.680.680.68200.60.60.940.940.94250.730.731.121.121.12321.191.191.861.861.86401.381.382.122.122.12501.511.512.772.772