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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DD1D2 Outside Diameter DD1D 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TT1T2 Wall thickness TT1T2 不小于公称壁厚的87.5% Equal to or bigger than87.5% nominal wall thickness
中心至端面  HF Center to End HF 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 CM 三通、四通 Tees Crosses ±2 ±3 ±5
全长 EE1 Full length EE1 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  

 注:
(1)除非用户有特殊要求,应优先保证端部外径和公称壁厚的极限偏差。
(2)指GB/T13401钢板制对焊管件,其他管件为外径正、负偏差绝对值之和。
Note:1.Extreme deviation of end outside diameter and nominal wall thickness should be ensured at priority,unless users have special requirement.
2.To be for GB/T13401 steel plate butt-welding fittings,other fittings arre the of absolute values of plus and minus deviatios of outside diameter.

 

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