聚乙烯燃气管道电熔对接接头的数字射线检测
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摘要
聚乙烯燃气管道耐腐蚀性好、利于施工、成本较低,在中、低压城市燃气管道中应用越来越广泛,具有替代钢制管道的趋势;但聚乙烯燃气管道电熔对接接头性能存在较大的安全隐患。提出一种由数字成像计算机、X射线源、探测器等设备组成的数字射线检测系统,对电熔对接接头进行无损检测。首先通过对比试验得到优化的检测参数:管电压130 V,管电流5 mA,单帧曝光时间2 s,叠加帧数4帧,焦距2 000 mm。然后将检测参数用于De63人工缺陷试件中金属丝错位缺陷、砂石夹杂缺陷和未完全熔合缺陷的检测。结果表明:金属丝错位缺陷和未完全熔合缺陷能够直接清晰辨认,砂石夹杂缺陷通过图像处理后能够清晰辨认。期待继续完善数字射线检测技术,推进相关行业标准的制定,为聚乙烯燃气管道电熔对接接头的无损检测规范提供权威指导。
Polyethylene gas pipeline is increasingly widely used as the medium/low pressure city gas pipeline because of its good corrosion resistance,easy for construction and low cost.It has the trend of replacing the steel pipeline.However,there are great potential safety hazards in the performance of its electric melting butt joints.A digital radiographic detection system consisting of devices such as digital imaging computer,X-ray source and panel detector is proposed for the nondestructive detection of electric melting butt joints.Firstly,through comparative experiments,the optimized detection parameters are obtained:tube voltage 130 V,tube current 5 mA,single frame exposure time 2 s,superimposed frame number 4 frames,focal length 2 000 mm.Then,the detection parameters are used to detect defects including metal wire dislocation,sand inclusion and incomplete fusion in a De63 artificial defect specimen.The results show that the defects of metal wire dislocation and incomplete fusion can be identified directly and clearly,and the defect of sand inclusion can be identified clearly after image processing.In order to provide authoritative guidance for the nondestructive detection of electric melting butt joints for the polyethylene gas pipeline,it is expected that the digital radiography technology is further improved,and the formulation of relevant industrial standards is promoted.
Polyethylene gas pipeline is increasingly widely used as the medium/low pressure city gas pipeline because of its good corrosion resistance,easy for construction and low cost.It has the trend of replacing the steel pipeline.However,there are great potential safety hazards in the performance of its electric melting butt joints.A digital radiographic detection system consisting of devices such as digital imaging computer,X-ray source and panel detector is proposed for the nondestructive detection of electric melting butt joints.Firstly,through comparative experiments,the optimized detection parameters are obtained:tube voltage 130 V,tube current 5 mA,single frame exposure time 2 s,superimposed frame number 4 frames,focal length 2 000 mm.Then,the detection parameters are used to detect defects including metal wire dislocation,sand inclusion and incomplete fusion in a De63 artificial defect specimen.The results show that the defects of metal wire dislocation and incomplete fusion can be identified directly and clearly,and the defect of sand inclusion can be identified clearly after image processing.In order to provide authoritative guidance for the nondestructive detection of electric melting butt joints for the polyethylene gas pipeline,it is expected that the digital radiography technology is further improved,and the formulation of relevant industrial standards is promoted.
引文
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[11]李新蕾,邹伟光,莫永兴,等.无损检测技术对比研究[J].工业技术创新, 2018, 5(2):102-105.
[2]伍树坤.燃气用聚乙烯管热熔焊对接接头的X射线检测和超声波检测应用研究[D].广州:华南理工大学, 2014.
[3]竺哲明,黄伟勇,郭伟灿.聚乙烯管道热熔对接接头的超声相控阵检测[J].无损检测, 2017, 39(1):38-41, 65.
[4]郭伟灿,施建峰,缪存坚,等.聚乙烯电熔接头超声相控阵检测缺陷自动识别方法[J].无损检测,2017, 39(5):13-18.
[5]伍宗银,刘伟平. PE管对接焊缝的射线检测方法的探讨[J].特种设备安全技术, 2018(3):53-55.
[6]丁守宝,郭伟灿,郑津洋.聚乙烯管道电熔接头超声检测[J].无损检测, 2008, 30(5):267-269.
[7]解俊炜,许卫荣,王强.聚乙烯管热熔接头超声相控阵检测及检出率定量分析[J].河南科技大学学报(自然科学版), 2019,40(3):21-26.
[8]强天鹏.数字射线照相技术的三个补偿原则[EB/OL].远东无损检测资讯网.
[9]陈乐.数字探测器阵列（DDA）检测与胶片照相对比研究[EB/OL].远东无损检测资讯网.
[10]邵翔,张胜军,吴文栋.射线检测在燃气用埋地聚乙烯管道焊接接头中的应用[J].无损检测, 2018, 40(2):35-37.
[11]李新蕾,邹伟光,莫永兴,等.无损检测技术对比研究[J].工业技术创新, 2018, 5(2):102-105.
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