Sistem Monitoring Kinerja Sub Bagian Operator Scada Menggunakan Agile Development Methods Studi Kasus PT. Cladtek Bi Metal Manufacturing

PT. Cladtek BI Metal Manufacturing merupakan perusahaan yang bergerak dibidang jasa industri untuk berbagai pekerjaan mengenai material logam, khususnya proses Cladding, Weld Overlay dan Lining pada pipa baja karbon untuk keperluan industri. Pada departement Production memiliki karyawan berjumlah 19 orang terdiri dari 1 orang supervisor, 3 orang foreman dan 15 orang pada sub bagian operator scada. Satu orang foreman membawahi 5 orang karyawan untuk memonitoring kinerja dan pemberian nilai. Namun sangat disayangkan, bahwa performa tim hanya dicatat secara manual pada sebuah buku catatan (log book) oleh setiap foreman (atasan) yang membuat sistem penilaian setiap karyawan menjadi lebih sulit karena tidak adanya visualisasi data yang mempermudahan manajemen mengambil keputusan. Dalam penelitian ini digunaka metode Agile Development untuk mempermudah proses pengambilan spesifikasi sistem dan alur bisnis dan keputusan. Metode agile software development adalah pengembangan perangkat lunak berdasarkan pengembangan iterative dan incremental dimana syarat dan solusi berubah melalui kolaborasi antara selft organizing dan cross functional tim. Sistem ini dibangun dengan Bahasa pemograman Bahasa php, database mysql yang berbasis web dengan tujuan menghasilkan suatu sistem informasi monitoring yang terstruktur dan dapat menampilkan data analisis dalam sebuah dashboard untuk mengendalikan kinerja sub bagian scada di PT. Cladtek BI Metal Manufacturing menggunakan model scrum dan mempermudah penilaian dan kontrol terhadap daftar kerja dan proyek yang masih manual

The Effect of Heat Treatment on Fracture Behavior in ENiCrFe-7 Weld Overlay Cladding Materials

The effect of heat treatment (as-weld, 615℃/48h) on fracture behavior in ENiCrFe-7 weld overlay cladding material was investigated. There were more NbC precipitates in the interdendrites for the heat treatment one after 615℃/48h than that of as-weld, which resulted in the lattice distortion in the interdendrites reduced by the heat treatment. As a result, the fractography was classified as brittle and transgranular fracture and the interdendrites played a major role in the failure of as-weld Alloy ENiCrFe-7, and the fractography was ductility fracture for the heat treatment one after 615℃/48h.`

Reelability Assessment of Adhesively Bonded Mechanically Lined Pipe

A solution to prevent liner wrinkling in Mechanically Lined Pipes (MLP) with a standard 3.0mm thick liner during reeling, without the use of pressurisation, has been developed in the form of the GluBi® lined pipe. The liner being adhesively bonded to the outer pipe, its integrity is maintained despite the global plastic strain applied by the installation method. This new linepipe product has been qualified for offshore use through testing accompanied by a detailed Finite Element Analysis programme to fully capture the pipe and adhesive behaviours under and range of temperatures and loading conditions. The objective of this analysis program was to investigate the reelability of the GluBi® pipe. The instalability was defined as the capability of the pipe to tolerate cyclic plastic deformation representative of a typical pipeline installation by reeling without the formation of wrinkling of the CRA liner, and to maintain the integrity of the adhesive layer, particularly near the weld overlay at the pipe ends. Important areas of the GluBi® pipe design are the pipe extremities, particularly the transition between the liner and the weld overlay length. A detailed Finite Element model of the pipe was created. It captured all stages of the pipe manufacturing: pipe lining, hydrostatic expansion, adhesive curing, overlay weld deposition and reeling simulation. The pipe modelled was 312.1mm OD × 19.7mm WT SMLS 450 with a nominal 3.0mm thick Alloy 625 liner. An important validation work was performed to obtain a precise material response of the adhesive layer between liner and outer pipe. The adhesive mechanical properties were thus assessed in shearing and peeling over a range of temperatures covering all possible manufacturing and installation conditions. The model's elements and adhesive property modelling were validated against physical test results. Sensitivity analyses were done on the adhesive curing temperature, the geometry of the adhesive transition between the liner and the overlay weld at the pipe ends and on the liner thickness. The model was subjected to reeling simulation corresponding to Subsea 7's reel-lay vessels. The liner's integrity post reeling was assessed according to a range of acceptance criteria. These studies made it possible to establish parameter ranges for the safe installation of the linepipe.

Effect of Welding Sequence and the Transverse Geometry of the Weld Overlay on the Distribution of Residual Stress in the Weld Overlay Repair of T23 Tubes

Water-wall tubes are important components in power plants and are used to absorb the heat from the boilers, and they often fail prematurely due to corrosion, erosion, and fatigue during service. To repair the defects, weld overlay repair is often adopted by forming a compressive stress area around the susceptible area to prevent the cracks from propagating. In order to obtain reasonable process parameters of weld overlay repair, a study combining experiments and numerical simulations was performed to investigate the welding residual stress distribution on the repaired area with different welding repair methods. The results reveal that a compressive stress area is generated on the repaired area after the repair, and a center-to-outside welding sequence is better than either a right-to-left welding sequence or an outside-to-center welding sequence when overlaying a one-layer weld; with an increase in the number of weld layers, the compressive stress area of the repaired area is expanded, and the stress level is increased, which results from the upward movement of the compressive stress area of the subsequent-overlaying layer and the superposition of the compression areas of the subsequent-overlaying layer and previous-overlaying layer, respectively. In addition, the number of the weld passes of each layer should be not less than four with the center-to-outside welding sequence.