基于γ射线扫描透射法的输油管道油垢测厚方法

A method for measuring the thickness of grease stain in oil pipeline based on γ-ray scanning transmission method

输油管道内壁油垢厚度的测量对于保障输油管道安全运行具有重要意义。基于γ射线透射原理并结合扫描技术,对输油管道的含油垢厚度进行测量。使用Cs-137γ射线源和NaI探测器搭建了一套输油管道油垢测厚装置,并利用蒙特卡洛计算软件MCNP对其进行数值模拟分析。以直径为100 mm、壁厚为5 mm、含10 mm厚油垢的中小型输油管道为例,用准直的γ射线束分别对空管道和含油垢空管道进行扫描,分析能量为0.662 Me V的γ射线透射率。结果表明:γ射线扫描透射法能够测量管道厚度和油垢厚度。相关研究成果可为提高管道的输油能力提供技术支持。

The measurement of grease stain thickness at the internal wall of oil pipeline plays an important role in ensuring the safe operation of oil pipeline. In this paper, the thickness of grease stain in oil pipeline was measured by using the scanning technology combined with γ-ray transmission principle. Firstly, a set of grease stain thickness measurement device was developed by using the Cs-137 γ-ray source and NaI detector. Secondly, the Monte Carlo calculation software MCNP was adopted to perform numerical simulation analysis on this device. And thirdly, a case study was carried out on the medium-small oil pipeline with the diameter of 100 mm, thickness of 5 mm and grease stain thickness of 10 mm. The pipelines with and without grease stain were scanned respectively by using the collimated γ-ray beam to analyze the transmittance of γ-ray at the energy of 0.662 MeV. It is shown that the γ-ray scanning transmission method can be used to measure pipeline thickness and grease stain thickness. The research results provide the technical support for improving the oil transportation capacity of pipelines.