Download - RADIOGRAPHY TEST
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Keunggulan Radiography Test
Mampu mendeteksi cacat dalam permukaan logam
lasan atau raw material. Bisa menghasilkan data yg terecord Cacat yang tampak pada film 1 : 1 Dapat dioperasikan pada posisi-posisi yang sulit
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Kerugian Pengujian Radiography Test
Dibutuhkan personel (orang) yang sudah
berkualifikasi dan berpengalaman (certified
personnel as ASNT requirment) Biaya pengujianya lebih mahal dibandingkan DPT,
UT dan MT Bahaya Radiasi sinar X dan sinar Gamma
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Prinsip Kerja Radiography Tets
Intensitas Radiasi akan berubah tergantung dari tebal material dan Density Material sehingga akan menghasilkan bayangan yang berbeda pada film hasil Radiography Test
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Sumber Radiasi
X – Ray dan Gamma Ray adalah suatu gelombang ELECTROMAGNETIC dengan tingkatan energy Radiasi sebagai berikut
Semakin tinggi Energy radiasi semakin tebal daya tembusnya dalam memeriksa suatu material
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Metoda X – Ray dan Gamma Ray
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Jenis-jenis Isotop Radioactive
Iridium ( Ir 192 ) Half Life = 74 days
Cobalt ( Co 60 ) Half Life = 3,5 years
Selenium ( Se 75 ) Half life = 118 days
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Half Value Thickness (HVT)
Intensitas akan berkurang ½ nya bila melewati suatu ketebalan material
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Film Radiography
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Contrast &
ExposureTime
Density (Derajat kehitaman film) akan lebih hitam bila waktu tembaknya semakin lama
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Film Speed
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Unsharpness Geometric (Ug)
Ug Max = (b x d) / f
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Persiapan & Penandaan Komponen yang akan di RTLoading Film ke Caset (dalam darkroom)Exposure timePencucian film (Darkroom) Interpretasi Film
Tahapan pengujian Radiography Test
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Persiapan Exposure
• Persiapan sebelum exposure dengan X ray dan Gama Ray
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Processing Film
• Pencucian film dalam darkroom (ruang gelap)
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Interpretasi Film
• Interpretasi film hasil radiography Test
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• Acceptance Creteria (kreteria diterimanya atau tidak dari suatu discontinuity adalah mengacu ke standard berikut misalnya :
ASME Sec I , Power Boiler code / satandard ASME sec VIII Div I, Pressure Vessel code / standard AWS D1.1 Structural Welding Code ASME B31.1 Power Piping ASME B31.3 Process Piping API 1104 Pipe line API 650 std , Design Structure Storage Tank standard BS EN 5817
Acceptance Creteria
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• Contoh Film RT yang akan di interpretasi
Slag Inclusion Random Porosity
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Surface discontinuitiesSurface discontinuities
External concavityExternal concavityInternal (root) undercutInternal (root) undercutExternal undercutExternal undercut
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Offset or mismatch with LOPOffset or mismatch with LOPExcessive penetrationExcessive penetrationInternal concavityInternal concavity
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Burn-throughBurn-throughOffset or mismatchOffset or mismatch
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Subsurface discontinuitiesSubsurface discontinuities
Scattered porosityScattered porosityCluster porosityCluster porosityRoot pass aligned porosityRoot pass aligned porosity
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Transverse crackTransverse crackInterpass slag inclusionsInterpass slag inclusionsElongated slag linesElongated slag lines
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Lack of penetrationLack of penetrationLongitudinal root crackLongitudinal root crackLongitudinal crackLongitudinal crack
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Tungsten inclusionsTungsten inclusionsInterpass cold lapInterpass cold lapLack of sidewall fusionLack of sidewall fusion
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Contoh Acceptance Creteria menurut EN 5817
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Safety Radiography Test1. Pada saat Pengujian radiography
harus dilakukan proteksi dari radiasi
2. Pekerja radiography harus menggunakan alat Surveyormeter & pocket dosimeter
3. Daerah radiography harus di tandai dengan memasang pita dan tanda bahaya Radiasi.
4. Pilih dan tentukan jarak yang aman bagi lingkungan umum (max 2,5 mR / hours)
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