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按照行业标准SY/T4109-2005《石油天然气钢质管道无损检测》的有关规定,本文通过几何不清晰度和一次透照长度的计算,总结出常见石油天然气长输和集输管道双壁单影法的透照次数和应使用的胶片规格。
According to the relevant provisions of the industry standard SY / T4109-2005 “non-destructive testing of oil and gas steel pipelines”, this paper summarizes the common long-distance oil and gas pipelines and double-walled single-tube shadow The number of passions and the film specifications to be used.