Radiographic inspection method with medium high-temperature pipeline

Abstract

The invention discloses a radiographic inspection method with a medium high-temperature pipeline. The radiographic inspection method comprises the radiographic inspection of a pipeline at 50 DEG C-80 DEG C and the radiographic inspection of a pipeline at 80 DEG C above. The radiographic inspection of the pipeline at 50 DEG C-80 DEG C comprises the steps of when the pipeline temperature is 50 DEG C-80 DEG C, adhering a photographic film to a tool frame, installing the tool frame on the pipeline, and photographing when a certain distance is formed between the photographic film and the pipeline. The radiographic inspection of the pipeline at 80 DEG C above comprises the steps of when the pipeline diameter is below 100mm, adding a thermal insulation material with the thickness of 5mm-10mm between a photographic film and a weld line, and photographing; when the pipeline diameter is 100mm above, adhering a thermal insulation layer to the inner side of a tool frame by adopting a mode of the tool frame and the thermal insulation layer, adhering a photographic film to the tool frame at the outer side of the thermal insulation layer, installing the tool frame on the pipeline, adding a thermal insulation material with the thickness of 5mm-10mm between the photographic film and the weld line through the tool frame, and photographing. According to the invention, time is saved for the comprehensive inspection of the pipeline, and the overhauling cost is reduced greatly.

Description

technical field [0001] The invention relates to a radiographic inspection of pipelines. In particular, it relates to a radiographic detection method for a high-temperature pipeline with a medium when the high-pressure and high-temperature pipeline is not stopped. Background technique [0002] Due to the characteristics of high pressure, high temperature and corrosion, the pressure pipeline is prone to defects such as corrosion and cracks during use. In order to meet the long-term operation requirements of petrochemical production, avoid unplanned shutdowns, and ensure safe production, it is necessary to conduct online inspections without stopping or venting. [0003] Radiography is generally used to inspect pipe welds for defects. In the case of liquid medium, if it is tested according to the conventional radiographic inspection process, there are problems such as poor clarity, low contrast, low sensitivity, blurred images, low negative pass rate (image quality) and many w...

AI Technical Summary

Problems solved by technology

[0004] Although the digital flat-panel ray transmission imaging system does not need the film washing process, the actual imaging technology is still ray technology, and when the tube diameter is large, there is a medium in the tube, and useful images cannot be obtained. The ray source cannot be used in conjunction with industrial radiography films.

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