1、.中国国家标准GB/T3091-2008低压流体输送用（镀锌）焊接钢管公称口径(mm)外径(mm)壁厚(mm)理论重量(kg/m)公称口径(mm)外径(mm)壁厚(mm)理论重量(kg/m)公称口径(mm)外径(mm)壁厚(mm)理论重量(kg/m)1520.51.80.893242.43.03.04100113.02.87.9620.51.90.9342.43.253.26114.33.08.5820.82.00.9942.43.53.48114.33.259.2520.82.11.034047.52.52.92114.33.610.1821.32.21.1048.32.83.28114.3
2、3.810.7021.32.31.1448.33.03.49114.34.011.2321.32.41.1848.33.253.75125139.03.010.4921.32.61.2648.33.54.01139.73.2511.3621.32.81.345059.52.53.69139.73.612.512026.01.81.1560.32.84.15139.73.813.1626.01.91.2060.33.04.42139.74.013.8126.32.01.2760.33.254.75139.74.2514.6226.32.11.3360.33.44.95139.74.515.432
3、6.92.21.4260.33.65.21150164.03.2513.3926.92.31.4760.33.85.47165.03.514.4526.92.41.536584.72.85.20165.03.815.6126.92.61.6376.13.05.64165.04.016.3926.92.81.7476.13.256.07165.04.217.162533.02.21.7776.13.66.66165.04.518.3233.02.31.8476.13.87.00168.34.016.7233.72.41.9576.14.07.34168.34.217.5133.72.62.098
4、087.52.86.11168.34.518.6933.72.82.2388.93.06.62200219.14.021.8933.73.02.3788.93.257.13219.14.524.4933.73.22.5088.93.67.84219.15.027.073241.82.52.5588.93.88.24219.15.529.6442.42.82.8688.94.08.64219.16.032.201 表中的公称口径系近似内径的名义尺寸，不表示公称外径减去两个工程公称壁厚所得的内径。2 根据需方要求，经供需双方协议，并在合同中注明，可供表中规定以外尺寸的钢管。钢管外径、壁厚的允许偏差公称外径D/mm管体外径允许偏差管端外径允许偏差/mm(距管端100mm范围内)壁厚允许偏差D48.30.5mm-10%48.3D273.11.0%D-273.1D5080.75%D+2.4，-0.8D5081.0%D或10.0，两者取较小值+3.2，-0.8.
