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Bayu Azmi
Pusat Aplikasi Isotop dan Radiasi - BATAN
Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Immunology & microbiology Materials Science & Nanotechnology

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GAMMA SCANNING TECHNIQUE FOR INVESTIGATING DE-ETHANIZER COLUMN: ON FIELD EXPERIMENTAL AT NGL PLANT Bayu Azmi; Wibisono Wibisono
Jurnal Forum Nuklir JFN VOL 13 NO 1 MEI 2019
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (866.748 KB) | DOI: 10.17146/jfn.2019.13.3.5412

Abstract

GAMMA SCANNING TECHNIQUE FOR INVESTIGATING DE-ETHANIZER COLUMN: ON FIELD EXPERIMENTAL AT NGL PLANT. De-ethanizer column is part of fractionators series at natural gas liquid (NGL) plant. During the production process, there are several common problems happen such as displaced or damaged trays, dry or flooding trays, unequal liquid level on trays, weeping or dumping trays, foaming on trays, etc. Therefore, investigation of column’s internal condition without interupting production process is needed to maintain the production level. Gamma scanning technique has been chosen to investigate 01-C-3401 de-ethanizer column. The column has two segments, the lower (ID: 1900 mm) and the upper (ID: 3200 mm) segments. Total column height (TL to TL) is 36710 mm. The scanning was conducted by positioning collimated gamma source (Co-60, 2.59 GBq) and detector (NaI(Tl)) flanking the column. The collimators move up in parallel by 50 mm and detector counted radiation that penetrated column for 3 seconds every scanning step. The scanning process were performed automatically using winch with AC motor, microcontroller module, computer with LabVIEW as graphical user interface (GUI). The results show mechanical structures of tray #1 - #38 were in good condition. There were no collapsed or flooded trays in the column.  The demister was in its position. Chimneys above tray #38 and tray #8 were observed exist. The liquid level during the scanning process were in normal liquid level (NLL) approaching to high liquid level (HLL). Gamma scanning technique has been succesfull to provide the internal structure condition information of the column.
Effect of Filter on Image Reconstruction using Filtered Back Projection Algorithm for Industrial Gamma-Ray Tomography Technique Bayu Azmi; Wibisono Wibisono; Darman Darman; Sugiharto Sugiharto
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 15, No 1 (2019): JUNI 2019
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (721.548 KB) | DOI: 10.17146/jair.2019.15.1.4236

Abstract

Gamma-ray tomography experiment has been carried out to detect the cross-sectional spatial patterns of test objects. The resulting image quality depends on the data collection and image reconstruction process. The images were built using filtered back projection algorithm. The filter in the algorithm affects the resulting image. It is necessary to know the proper filter when reconstructing image using the algorithm. Data were collected by scanning the object using the parallel beam method. Scanning configuration was set up to every 5 mm and 32 projections (rotational scans). The scanning system consists of mechanical parts, computerized control module, a gamma-ray source (2.96 GBq of Cs-137), a NaI(Tl) scintillation detector, data acquisition and computer. In this paper, the data were reconstructed into images using back projection and also filtered back projection algorithm to study effect of the filters. The filters discussed are Ramp filter, Shepp-Logan filter, Hann filter, Hamming filter, and Cosine filter. The reconstructed images results with filter were much better than without filter. The images with no filter did not represent the object cross-sectional spatial patterns and looked blurred. There were only solid objects represented by bright white and air represented by dark colors. The images using filter could distinguish object based on its density. Ramp filtered images looked like it was filled with freckles. Shepp-Logan filter produced smoother images than Ramp filter. Hann, Hamming, and Cosine filtered images were smoother than the others. Hann and Hamming filters produced higher resolution images regarding to recognizing density value. Hann filtered images also has the smallest standard deviation. Overall, Hann filter is recommended to be used to reconstruct images from projections.
Pengukuran Scaling pada Pipa menggunakan Tomografi Gamma Parallel Beam Bayu Azmi; Wibisono Wibisono; Adhi Harmoko Saputro
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 13, No 1 (2017): Juni 2017
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2017.13.1.3914

Abstract

Pembentukan scale pada pipa maupun unit proses lainnya dapat terjadi di dalam proses produksi. Scaling pada pipa dapat mengurangi diameter pipa sehingga mengurangi laju alir dan bahkan mengakibatkan pipa tersumbat. Pengukuran diperlukan untuk mengetahui keberadaan dan persentase scaling pada pipa. Tomografi merupakan teknik yang digunakan untuk menginvestigasi struktur dalam suatu obyek secara non-intrusive dan non-invasive. Dalam penelitian ini sistem tomografi digunakan untuk pemindaian translasi dan rotasi secara otomatis. Sumber radiasi gamma 137Cs yang terkolimasi mentransmisikan foton gamma menembus obyek uji yang kemudian dideteksi dengan detektor sintilasi NaI(Tl). Kumpulan data proyeksi dibangun menjadi citra menggunakan perekonstruksi citra dengan metode filtered back projection (FBP). Citra hasil rekonstruksi dapat membedakan material dengan nilai densitas yang berdekatan seperti air (1 g/cm3), parafin (0,9 g/cm3), dan pertalite (0,72-0,77 g/cm3). Citra pipa dengan scale dianalisis untuk menghitung persentase area aliran setelah terjadi scaling terhadap pipa normal (pipa tanpa scale). Hasil analisis citra area aliran yang tersisa pada pipa geothermal plant adalah 10,06% dengan 16 proyeksi, 9,86% dengan 32 proyeksi, 9,75% dengan 64 proyeksi, dan 9,76% dengan 128 proyeksi, sedangkan 26,08% pada pipa furnace dengan 32 proyeksi. Sistem yang telah dibangun berhasil memindai obyek, mengakuisisi dan mengumpulkan data, serta membangun dan menganalisis citra untuk menginvestigasi scale di dalam pipa.
Gamma Tomography as The Complementary Technique for Pipe Scale Investigation: Field Experiment at Petrochemical Plant Bayu Azmi; Indra Milyardi; Megy Stefanus; Wibisono Wibisono; Fery Hadi Setiawan; Norman Pamungkas; Zulkifli Lubis
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 19, No 1 (2023): Vol 19, No. 1 (2023): November 2023
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2023.19.1.6929

Abstract

             Crack gas flowing from furnace to gasoline fraction tower through BA-106 pipeline. The pipeline has not been inspected for 30 years of operation and it is suspected that there is pipe scale in it. The scaling reduces the inner diameter of the pipe which disrupt the pipeline flow rate that might cause a fatal accident. The scale particles also became impurities in the subsequent process. The information on scale conditions inside the pipeline is needed to determine further action to ensure safety and maintain the productivity of the plant. The gamma scanning technique was conducted at 18 points to diagnose the scaling profile inside the pipe. A collimated 2.96 GBq 137Cs radiation source emits a pencil beam of gamma photons to penetrate the pipe. A NaI(Tl) scintillation detector was placed opposite the gamma source to detect the photons. They were moving in parallel vertically and horizontally for every 10 mm step to get the attenuation profile of the pipe. Furthermore, a tomography scan was performed at selected points with 32 projections data. So far previous experiments were performed in the laboratory and the objects were smaller (less than 500 mm), however, the current experiment was performed in real industrial plants and the object diameter was about 1500 mm. The reconstructed image has been successful in showing the cross-sectional of the pipe that consists of scale inside it. The image was analyzed to get the percentage of the remaining fluid area due to scaling. The remaining fluid area was 56.15% of normal pipe without scale. It was proved that the gamma tomography technique is suitable for pipe scale measurement to get the cross-section visualization of the pipe.
Co-Authors Adhi Harmoko Saputro Darman Darman Fery Hadi Setiawan Indra Milyardi Megy Stefanus Norman Pamungkas Sugiharto Sugiharto Wibisono Wibisono Wibisono Wibisono Wibisono Wibisono Wibisono Wibisono Zulkifli Lubis