In-service corrosion evaluation in pipelines using gamma radiography – a numerical approach

Edalati, Kaveh; Rastkhah, N.; Kermani, A.; Seiedi, M.; Amir, Mohammad

doi:10.1784/insi.46.7.396.55583

Cited by 5 publications

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“…For each pixel, the depths of design were calculated and executed. Then the correction was applied due to the depth of designs [14]. Images of antique plate designs are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

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Cultural Heritage Object Identification by Radiography Nondestructive Method and Digital Image Processing

Yahaghi

Amir²,

Ahmadi³

et al. 2011

AMM

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Nondestructive testing (NDT) is an important tool in the world of industry. Among different NDT methods, radiography plays a very interesting role both in industry and medicine. Medical and industrial uses of X and gamma rays were recognized since more than 1 century ago. One of the interesting uses of radiography is in archeological and art applications. In this research, radiography was utilized for identification of a damaged art-historical material. The subject is a brass tray belonging to Iran cultural heritage with an estimated age of about 3500 years. The tray was found in Lorestan province and referred to as “Lorestan bonze”. The object was damaged seriously due to heavy corrosion attack. Therefore recognition of the object was a major problem. Normal radiography method can help for object determination, but it suffers some major drawbacks related to contrast and thickness measurement. Image processing technique and a precise thickness measurement method were added to digitized radiographs. A precise radiographic thickness method was introduced and used before for the pipeline radiography. For digital image processing, Canny edge detection method and Gaussian filter were used. Radiography image obtained from this work showed a very clear picture of the original trace of hammered design. These results showed that a combination of radiography, image processing techniques and consideration of physical principles of radiation interaction with materials can produce a very clear image which can be used effectively for hte detail analysis of cultural heritages.

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“…For each pixel, the depths of design were calculated and executed. Then the correction was applied due to the depth of designs [14]. Images of antique plate designs are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…Using equation ( 1), reconstruction algorithm was applied to each pixel and correction image was obtained. In equation ( 1), S is pixel value and depends on X-ray energy and the kind of film [14][15][16][17][18].…”

Section: Resultsmentioning

confidence: 99%

Cultural Heritage Object Identification by Radiography Nondestructive Method and Digital Image Processing

Yahaghi

Amir²,

Ahmadi³

et al. 2011

AMM

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The use of radiography for thickness measurement and corrosion monitoring in pipes

Edalati

Rastkhah

Kermani

et al. 2006

International Journal of Pressure Vessels and Piping

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Sensitivity Evaluation in Double Wall Radiography of Pipes and Multilayer Plates by Assessment the Monte Carlo Simulation

Edalati¹,

Rokrok²,

Kermani³

et al. 2006

Journal of Testing and Evaluation

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Image quality indicator (IQI) is selected based on the single and/or double wall thickness of pipe with or without considering the radiographic techniques or applied radiation source (x ray or gamma ray), in accordance with the sensitivity requirements of reference codes. Discrepancies in the codes and standards for sensitivity evaluation and IQI selection have been investigated in the present work and some experiments have been performed to measure the gamma ray or x-ray radiographic sensitivity for pipes and plates to compare the results with sensitivity requirements of the standards. Due to the considerable effect of scattering on the sensitivity, Monte Carlo method has also been used to simulate the scattering for gamma ray radiography of pipes and plates. Experiments revealed that 2% sensitivity based on the single wall thickness was attainable for double wall exposure and single wall viewing (DWSI) technique, but it could not be easily obtained for double wall exposure and double wall viewing (DWDI) gamma ray technique. Higher sensitivity was obtained for x-ray radiography and a considerable sensitivity reduction was found for in-service radiography of pipes. Achieved sensitivities were in good agreement with measured effective attenuation coefficients and simulation results which confirmed that scattering was, respectively, higher for DWDI radiography of pipe, radiography of single layer plate, and DWSI radiography of two layer plate with identical penetrated thickness. Therefore, IQI selection was proposed to be based on the single wall thickness of component except for DWDI Gamma ray radiography, which was proposed to be based on the double wall thickness.

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In-service corrosion evaluation in pipelines using gamma radiography – a numerical approach

Cited by 5 publications

References 0 publications

Cultural Heritage Object Identification by Radiography Nondestructive Method and Digital Image Processing

Cultural Heritage Object Identification by Radiography Nondestructive Method and Digital Image Processing

The use of radiography for thickness measurement and corrosion monitoring in pipes

Sensitivity Evaluation in Double Wall Radiography of Pipes and Multilayer Plates by Assessment the Monte Carlo Simulation

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