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ITS » Paper and Presentation » Teknik Permesinan Kapal Posted by dee@its.ac.id at 02/10/2013 12:05:27 • 1569 Views
ANALYSIS RADIOGRAPHYC EXAMINATION ON THE LOWER DRUM IN
BARATA INDONESIA INC
Author : FAUZI, AHMAD ( 6308030020 )
ABSTRAK
Boiler merupakan sebuah alat yang digunakan untuk menghasilkan uap steam di atas tekanan atmosfer. Boiler memiliki bagian yang disebut lower
drum. Lower drum ini di tempatkan di dasar boiler jenis water tube boiler di bawah upper drum. Spesifikasi lower drum yang akan diuji radiografi terbuat dari plat baja SA 516 Gr 70 didesain dengan tekanan 33 kgcm2 dan kapasitas uap
35000 kghr. Oleh karena itu harus dilakukan full radiography pada sambungan butt weld sesuai dengan ketentuan ASME Section VIII UW-11. Teknik penembakan yang digunakan dalam pengujian ini adalah SWSI Single Wall and Single Image. Jenis teknik SWSI yang digunakan adalah internal source technique untuk longitudinal weld dan teknik panoramik untuk circumferential weld. Film hasil pengujian radiografi dievaluasi berdasarkan kondisi fisik film artifact dan interpretasi indikasi pada daerah pengelasan. Hasil pengujian menunjukkan adanya densiti film yang tidak memenuhi
kriteria ASME Section V sehingga diperlukan penembakan ulang. Film yang tidak memenuhi kriteria tersebut terdapat pada segmen D-E sambungan CWL3. Selain itu pengujian radiografi pada lower drum menemukan indikasi cacat pada segmen I-J yang terletak di sambungan CWL4. Indikasi cacat yang ditemukan adalah cluster porosity yang harus dilakukan repair karena tidak memenuhi standar penerimaan ASME Section VIII.
ABSTRACT
Boiler is a device used to generate steam above atmospheric pressure. Boiler has a section called the lower drum. Lower drum is placed in the bottom of the boiler water tube boiler type under the upper drum. The specification of lower drum to be radiographic tested made of plate steel SA 516 Gr 70 designed with a pressure of 33 kgcm2 and steam capacity of 35 000 kg hr. Therefore it must be done full radiography in butt weld connections in accordance with the provisions of ASME Section VIII UW-11. Exposure techniques used in this examination is SWSI Single Wall and Single Image. SWSI technique type used is an internal source technique for the longitudinal weld and panoramic technique for circumferential weld. Film radiography examination results are evaluated based on the physical condition of the film artifact and the interpretation of indications on the welding area. Test results indicate that the film density does not meet the criteria of ASME Section V so that the required re-shooting. Films that do not meet the
criteria contained in the D-E segment CWL 3 joint. In addition radiographic testing at lower drum found indications of defects in the segment I-J is located in CWL 4 joint. Indications of defects found is the cluster porosity to do repair because it does not meet the admission standards of ASME Section VIII.
Source Presentation of Marine Engineering, 621.367 3 Fau a, 2013
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