质量指标
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项 目
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API 5L
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GB／T9711.1-1997
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SY／T5037-92
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管端外径偏差
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+1.59mm
-0.79mm
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D<273.1mm
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+1.59mm
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D<508mm
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±0.75%D
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-0.40mm
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D≥323.9mm
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+2.38mm
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D≥508mm
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±0.50%D
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-0.79
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壁厚偏差
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D<457.2mm
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+15.1%t
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D≤457mm
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+15.0%t
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D<508mm,±12.5%t
D≥508mm,±10.0%t
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D≥508mm
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-12.5%t
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-12.6%t
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+17.5%t
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(L175,L210,L245)
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D>508mm
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+14.5%t
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-10.0%t
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D≥508mm
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-8.0%t
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+19.5%t
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-8.0%t
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直度
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≤0.2%L
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≤0.2%L
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≤0.2%L
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椭圆度
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D>508mm,± 1.0%D
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D>508mm,± 1.0%D
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± 1.0%D
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| 管端状态
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坡口:30°～35° 钝边:1.59±0.79mm 切斜:<1.59mm |
坡口:30°～35° 钝边:1.59±0.79mm 切斜:<1.59mm |
坡口:30°~35° 钝边:1.6±0.8mm 切斜: D<813mm,≤1.5mm D≥813mm,≤3.0mm |
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无损检验
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100%X射线或100%超声波加管端X射线 检验 |
100%X射线或100% 超声波加管端X射线 检验 |
补焊焊缝，对头焊缝及环
向焊缝无损检验
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水压试验
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p=2st/D
D<508mm, s=0.85σs
D≥508mm, s=0.90σs
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p=2st／D
L290~L555
D=219.1mm,s=0.75Rt0.5
273.1<D≤457mm,S=0.85Rt0.5
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P＝2[σ]t／D
[σ]＝(0.6~0.8)σS
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备注:
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D--钢管公称外径,mm; t--钢管公称壁厚,mm; S,[б]--水压试验应力,MPa; P--水压试验压力,MPa; σs－屈服强度Mpa; L--单根钢管长度,m; б0.5--试样标距长度上产生0.5的总伸长时所需的拉应力,MPa |
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