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M Sabri
UNIVERSITAS SUMATERA UTARA
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PENGARUH SAMBUNGAN LAS PADA MATERIAL ALUMINIUM-MAGNESIUM PADA BODY PESAWAT TANPA AWAK TERHADAP BEBAN IMPAK DAN CACAT LAS Dahlan Tanjung; Ikhwansyah Isranuri; M Sabri; Marragi M; Farida Ariani
Jurnal Dinamis Vol 5, No 4 (2017): DINAMIS
Publisher : Jurnal Dinamis

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (350.022 KB)

Abstract

Pembangunan konstruksi dengan menggunakan logam pada masa sekarang ini banyak melibatkan unsur pengelasan khususnya bidang rancang bangun karena sambungan las merupakan salah satu pembuatan sambungan yang secara teknis memerlukan keterampilan yang tinggi bagi pengelas. Agar diperoleh sambungan dengan kualitas baik dengan menggunakan pengelasan Oxy Acetylene Welding (OAW) pada material paduan Aluminium-Magnesium. Salah satu faktor yang mempengaruhi ketangguhan material adalah sifat mekanik dari material tersebut. Untuk mengkaji hal tersebut disusunlah sebuah konsep penelitian yang terdiri dari dua tahapan. Mengukur nilai ketangguhan (Impak) pengelasan pada Aluminium-Magnesium dan pengujian Penetran(Cacat las). Pada pengujian Impak nilai ketangguhan tertinggi terdapat pada spesimen I yaitu sebesar 0,3501 joule/mm2. Dan  pada pengujian penetran terdapat cacat las yang berupa retak (Crack) dan lubang jarum (pin hole). Penambahan unsur magnesium sangat mempengaruhi sifat mekanik dari material tersebut.
Identification of Mothballed and Retired Units of Reliability-Based Steam Power Generation Systems M Sabri
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.2598

Abstract

A steam power generation system is a power generation system that uses steam power. The generating system itself has two types of unit statuses, namely active and inactive, which in this case are subdivided into Mothballed and Retired Unit statuses. The status of the unit provides a statement or decides whether the generating system is still suitable for use or has to be replaced (inactive). Determination of the status of the unit in the steam power generation system is carried out by calculating the work reliability of the generating unit. This is done to get the maximum decision. If you set the unit status incorrectly, the production costs incurred will be greater and not proportional to the number of products produced. This study focuses on two power generation units that have been used for a long time and experienced a decrease in performance. Therefore, identification of the status of the Mothballed and Retired Units of the steam power generation system was carried out by using a reliability test so as to produce a decision in determining the status of a more reliable unit. The method used to determine the status of the unit is to use the Reliability Block Diagram (RBD) and the Generating Availability Data System (GADS), the results of which state that unit one is in Mothballed status, which means the unit is no longer active but can still be used or reactivated within a period of several months. with a reliability level of 4.92% if it operates for 800 hours or a month. Meanwhile, unit two is declared to have the status of Retired Unit or can no longer be used again.
Co-Authors ., Mahadi A Husein Siregar Ali M Nainggolan Andi Yongko Apriyan A Saputra Berto P Simanjorang Bustami Syam Dahlan Tanjung Farida Ariani Gunawan H Ikhwansyah Isranuri Indra . Irvin . Marragi M Pramio G Sembiring Rahmad H Sitompul, Darwin Syahrul Abda Tugiman . Yudi Pratama Zimmi S Manullang