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对焊管件尺寸的极限偏差 gb12459\GB/T13401 e Extreme deviation for butt-welding fittings siz |
项目 Item | 管件种类 Fitting category | 公称通径DN Nominal bore | |||||||
15-65 | 80-100 | 125-200 | 250-450 | 500-600 | 660-750 | 850-1200 | |||
极限偏差 Extreme deviation | |||||||||
端部外径D、D1、D2、 Outside Diameter D、D1、D at Bevel | 所有管件 All fittings | +1.6 -0.8 | ±1.6 | +2.4 -1.6 | +4.0 ±3.2 | +6.4 -4.8 | |||
端部内径 d inside diameter d at bevel | ±0.8 | ±1.6 | ±3.2 | ±4.8 | |||||
壁厚T、T1、T2 Wall thickness T、T1、T2 | 不小于公称壁厚的87.5% Equal to or bigger than87.5% nominal wall thickness | ||||||||
中心至端面 H、F Center to End H、F | 45°、90°弯头 45°、90°Elbow | ±2 | ±3 | ±5 | |||||
中心至中心 P Center to center p | 180°弯头 180° Elbow | ±7 | ±10 | - | |||||
背面至端面 K Back to End K | ±7 | - | |||||||
长度 L Length | 异径管 Reducer | ±2 | ±3 | ±5 | |||||
中心至端面 C、 MCenter to End C、M | 三通、四通 Tees Crosses | ±2 | ±3 | ±5 | |||||
全长 E、E1 Full length E、E1 | 管帽 Cap | ±4 | ±7 | ±10 | |||||
端部****最小外径差 Difference of max .and。.min。.Outside diameters | 所有管件 All fittings | - | 不大于0.01DN、且不大于T Equal to or smaller than 0.01DN and equal to or smaller than T | ||||||
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