管材外徑和壁厚允許偏差

1、1管材外徑和壁厚允許偏差管材外徑和壁厚允許偏差一、鍍鋅鋼管（焊接鋼管）：公稱口徑外徑普通鋼管加厚鋼管壁厚壁厚㎜in公稱尺寸（㎜）允許偏差公稱尺寸（㎜）允許偏差（%）公稱尺寸（㎜）允許偏差（%）61810.22.002.5081413.52.502.80103817.22.502.80151221.32.803.50203426.92.803.525133.73.204.003211442.43.54.004011248.30.5㎜3.5

2、04.5050260.33.804.506521276.14.004.5080388.94.005.001004114.34.005.001255135.74.005.501506168.31%D4.50106.00101、鍍鋅管表面質(zhì)量：鍍鋅鋼管的內(nèi)表面應(yīng)有完整的鍍鋅層。不得有未鍍上黑斑和氣泡存在。允許有不大的粗糙面和局部的鋅瘤存在。2、焊接管表面質(zhì)量：根據(jù)鋼管相應(yīng)的制造方法，鋼管內(nèi)外表面應(yīng)光滑，不允許有折疊、裂縫、分層、搭焊缺陷存在

3、。鋼管表面允許有不超過壁厚負(fù)偏差的劃道、刮傷、搭縫錯(cuò)位、燒傷和結(jié)疤等缺陷存在。允許焊縫處壁厚和內(nèi)縫焊筋存在。3、本表根據(jù)國標(biāo)GBT30912008（代替GBT30912001），進(jìn)行編寫，其它詳見該標(biāo)準(zhǔn)。3三、給水UPVC管：單位：MM壁厚（公稱壓力）序號(hào)公稱外徑0.6MPa0.8MPa1.0MPa1.25MPa1.6MPa1202.02252.03322.02.44402.02.43.05502.02.43.03.76632.02.5

4、3.03.84.77752.22.93.64.55.68902.73.54.35.46.791103.23.94.85.77.2101253.74.45.46.07.4111404.14.96.16.78.3121604.75.67.07.79.5131805.36.37.88.610.7142005.97.38.79.611.9152256.67.99.810.813.4162507.38.810.911.914.8172808.29

5、.812.213.416.6183159.211.013.715.018.7193559.412.514.816.921.12040010.614.015.319.123.72145012.015.817.221.526.72250013.316.819.123.929.72356014.917.221.426.72480021.224.830.61、外觀：管材內(nèi)外壁應(yīng)光滑、平整，不允許有氣泡、裂口和明顯的痕紋、凹陷、色澤不均及分解變色