Ajitama, Fardan Nozami (2016) Studi Penentuan Sisa Ketebalan Material Di Permukaan Dalam Pipa Baja Karbon Akibat Korosi Pada Sambungan Las Di Kapal. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pipa baja merupakan salah satu komponen yang terdapat pada kapal. Pipa yang disambung dengan menggunakan pengelasan rentan terhadap korosi pada bagian dalamnya. Sisa ketebalan material pada sambungan las tersebut dapat diketahui dengan menggunakan pengujian ultrasonik. Penelitian ini membahas tentang studi penentuan sisa ketebalan material di permukaan dalam pipa baja karbon akibat korosi pada sambungan las di kapal. Studi penentuan sisa ketebalan material pada permukaan bagian dalam pipa baja karbon bisa dilakukan melalui ekperimen pengujian ultrasonik dengan probe normal dual crystal. Dengan memodifikasi sepatu probe sesuai bentuk las-lasan sisa ketebalan material di permukaan dalam pipa baja karbon dapat diketahui. Penelitian ini menggunakan tiga variasi diamater pipa (48 mm, 96 mm dan 160 mm). Tiap-tiap spesimen dibuat cacat buatan dengan kedalaman 0.5 mm 1.5 mm dan 2.0 pada bagian root. Berdasarkan percobaan yang dilakukan, penentuan sisa ketebalan material pada permukaan dalam pipa baja karbon dapat dilakukan dengan cara membuat sepatu probe modifikasi pada ultrasonik flaw detector probe normal kristal dua. Sisa ketebalan material pipa dapat diketahui dengan cara mengurangi ketebalan pipa dikurangi dengan kedalaman cacat korosi yang terdeteksi oleh alat ultrasonik flaw detector. Pada pengujian ultrasonik dengan arah bidang pemisah kristal probe yang tegak lurus dengan sumbu las mempunyai kemampuan pendeteksian kedalaman cacat yang lebih baik dibandingkan dengan arah bidang pemisah kristal probe yang searah dengan sumbu las. Hal ini dikarenakan gelombang ultrasonik memotong secara melintang pada cacat tersebut sehingga cacat tersebut mudah memantulkan kembali gelombang ultrasonik untuk diterima oleh probe.
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Steel pipe is one of important components of a vessel. The pipes are usually joined using welding and therefore they are susceptible to corrosion, especially on the inside surface. The remain thickness of material at the weld tie can be determined by using ultrasonic testing. This research discusses how to determine the remain thickness of material on the inner surface of carbon steel pipe due to corrosion at welded tie on a ship. Most studies regarding how to determine the thickness of residual material on the inner surface of carbon steel pipe are usually carried out using ultrasonic testing with dual crystal normal probes. Modifying the shape of the probe shoe should enable the detection of the remain thickness of material on the inner surface of the carbon steel pipe. This research uses three variations of pipe diameters (48 mm, 96 mm and 160 mm) where each specimen is made of artificial crack with a depth of 0.5 mm, 1.5 mm and 2.0 at the root. Based on the experiments conducted, the determination of residual thickness of the material on the surface of the carbon steel pipe can be done by making modifications to the ultrasonic probe shoe flaw detector probe crystal normal two. The rest of the thickness of the pipe material can be determined by reducing the thickness of the pipe is reduced by the depth of corrosion defects are detected by ultrasonic flaw detector. In ultrasonic testing with the direction of crystal probe interface that is perpendicular to the axis of the weld has the ability to detect defects depth better than the direction of the interface the probe crystal axis direction of the weld. This is because the ultrasonic wave cut transversely at the flaw so that these defects easily reflect back ultrasonic waves to be received by the probe.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSPe 620.112 6 Aji s |
| Uncontrolled Keywords: | Ultrasonic test, Kristal, Pipa, Baja |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking. V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis |
| Depositing User: | Yeni Anita Gonti |
| Date Deposited: | 13 May 2020 08:30 |
| Last Modified: | 13 May 2020 08:30 |
| URI: | http://repository.its.ac.id/id/eprint/75970 |
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