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Reliability Analysis on the Effect of Subsea Buoy to the Tension of Spread Mooring System
Get PDFA lot of research has been carried out regarding variations in mooring systems, one of which is the addition of buoys to the mooring system. In analyzing variations in mooring system designs, what needs to be considered is the reliability of the mooring lines. Therefore, in this research will analyze reliability on the effect of subsea buoy to the tension of mooring line with a variation position of subsea buoy. The variations on the position of one subsea buoy is arranged at the distance of the anchor 605 m, 577.5 m, 550 m, 522.5 and two subsea buoys at the distance from the anchor 605 m and 467.5 m. The analysis was performed for stand alone and offloading conditions with wave directions of 0 °, 45 °, 90 °, 135 °, 180 °. In this study to find the reliability of mooring lines, the author uses the Mean Value First Order Second Moment (MVFOSM) method. The results from this study, the probability of failure in the offloading condition without subsea buoy is 4.897E-17 and with subsea buoy (522.5 m) is 4.018E-17. Probability of failure in the stand alone condition without subsea buoy is 2.763E-16 and with subsea buoy (522.5 m) is 1.881E-16. From the probability of failure, the reliability of mooring lines in the offloading condition and stand alone condition without subsea buoy and with subsea buoy (522.5 m) is 1.00. The reliability calculation determined by DNV-OS E301, the results obtained meet the specified reliability criteria
Maintenance Strategy for Pressure Vessel at Offshore Platform Using RBI Method
Get PDFThe increasing complexity of installations and operations of oil and gas facility, the growing public awareness need to ensure higher levels of safety have give a high pressure to designers and operators to find innovative solution to ensure a safe and economically viable operation. RBI is one of the solution can be used. RBI is a popular method and trusted for measure and develop inspection plan also provide many advantage such as plant availability, decrease failure happen, decrease risk level based on its failure and decrease inspection cost caused for production facility. The use of RBI can help in determining the inspection schedule of pressure vessel V-001 at offshore platform. RBI method determine the risk level of the object by calculate the probability of failure and consequence of failure of the object based on API 581. The result obtained for probability of failure V-001 is 0.000127099 (left head), 0.000123717 (shell) and 0.000131098 (right head) and the consequence of failure is 438.934 m2. The risk analysis of V-001 is categorized as medium level with recommendation inspection is 5 years for external inspection and 10 years for internal inspection with recommendation inspection use ultrasonic test, visual test, edy current and radiographic test
Numerical Study of Three-Dimensional Flow in a Negative Pressure Isolation Room with One Inlet and Two Outlets Ventilation Configurations with Variations in Bed Positions and Variations in Outlets Pressure Differences
No full textDesigning the negative pressure isolation room need good ventilation planning. The design of the ventilation system must make every part of the room well circulated so that the air does not stagnate. In addition, the air must not be short-circuited between the inlet and outlet. Aspects of the comfortability of the patient must be considered including temperature, velocity and air pressure in the room. By doing simulation, it is expected that the optimal flow characteristics can be known in order to maintain the air condition of the isolation room at a low infection level and the patient in the room still feels comfortable. The method used in this research is a three-dimensional numerical study in a negative pressure isolation room with a size of 6 m x 8 m x 3 m. Variations carried out in this study are position of the patient's bed and difference in the outlet pressure of -2.5Pa, -5 Pa, -8 Pa, -15 Pa, respectively. The boundary conditions at the inlet uses a mass flow inlet type with a mass rate at 0.5642 kg/s (12 ACH ) and at the outlets use a pressure outlet type. The results obtained from this study are that the outlet pressure variation of -5 Pa is the best variation because it can create a negative pressure room according to existing standards and also patient still fell comfort because the room pressure is not too negative. The configuration of the isolation room with one bed has better airflow characteristics than the isolation room with two beds because there is no air stagnation in the area above the bed. Patient comfort can be maintained because the speed in the bed area is less than 0.2 m/s, the temperature near the bed is less than 28 oC, and the room pressure does not reach -1mmHg or -133 Pa (Gauge Pressure)
Applications of Double Group Theory in 2D Materials
Get PDFGroup theory is a fundamental mathematical frame- work valuable for analyzing the band structures in materials science. The hexagonal structures have unique electronic struc- tures, especially in 2D materials in group-IV, where the system is observed as the topological insulator. Meanwhile, in the case of group-V, it is semiconductors. This paper analyzes group- IV and group-V band structures based on group theory and proposes a method to identify the irreducible representation (IR) in symmorphic systems. It is found that all materials in group- IV are topological insulators. The evaluation of Z2 invariant v in group-V found that the phosphorene and bismuthene cases are v = 0 and v = 1, respectively, and belong to trivial and topological insulator materials for phosphorene and bismuthene, respectively
Prioritas Peningkatan Kenyamanan Rusunawa Dandangan Kota Kediri Berdasarkan Kriteria Layak Huni
Get PDFPesatnya urbanisasi dan pertambahan penduduk menyebabkan kebutuhan rumah terus meningkat. Ditambah dengan masifnya pembangunan, kebutuhan ruang untuk membangun rumah semakin sedikit. Dengan demikian, Pemerintah berusaha untuk memenuhi kebutuhan rumah dengan keterbatasan lahan melalui program Rumah Susun Sederhana Sewa (Rusunawa). Rusunawa hendaknya memenuhi kriteria dan standar layak huni sehingga dapat mewujudkan rasa aman dan nyaman bagi penghuninya. Dengan demikian, dilaksanakan penelitian untuk mengidentifikasi kenyamanan hunian Rusunawa Dandangan sehingga dapat diketahui aspek yang diperhitungkan dalam arahan konsep peningkatan kualitas Rusunawa. Peningkatan kualitas Rusunawa yang layak dan nyaman untuk dihuni akan mampu meningkatkan kualitas hidup para penghuninya. Penyusunan ini menggunakan metode analisis deskriptif dan Importance Performance Analysis (IPA). Adapun perumusan konsep didasari dengan hasil kuadran IPA dengan kebijakan atau penelitian terdahulu yang sesuai konsep layak huni dan harapan penghuni. Berdasarkan hasil penelitian, dihasilkan 5 kriteria kenyamanan berdasarkan kriteria layak huni, yaitu kecukupan ruang tinggal, kelengkapan sarana, pemenuhan kebutuhan tinggal yang menunjang aktivitas penghuni, peningkatan keselamatan dan keamanan, serta peningkatan kapasitas kelembagaan dan peningkatan taraf hidup penghuni
Prequalified Connections Analysis for Moment Frames: Bolted Flange Plate (BFP) and Double-Tee Connection
No full textDesign of steel structure connections is very important to realize the planned performance of the structures. SNI 7972:2020 specifies prequalified connections for steel moment frames for seismic applications. Bolted Flange Plate (BFP) and Double-Tee connections are non-patented bolt connections. The analysis of both types was carried out by also considering the provisions in SNI 7860:2020 and SNI 1729:2020 to obtain the advantages of each type for decision making purposes. BFP type produces a relatively smaller bolt diameter with more numbers. Attention must be paid to the length limit of the bolt group which does not exceed the depth of the beam. The need of connecting plates dimension is not difficult. Welding connection of plate to column must be carried out in the worlshop. Double-Tee connection analysis produces a larger bolt diameter with less amount. The thing that needs attention is the fulfillment of the Tee dimension which obtained from the cut hot-rolled profile
Gerakan Sosial Petani Pagar Batu
Get PDFThe emergence of the Pagar Batu peasant social movement can be attributed to the expression of dissent towards companies involved in oil palm plantations. The conversion of agricultural land into these plantations has posed a myriad of challenges for the peasants. The primary objective of this study was to investigate the underlying issues between the oil palm plantation company and the Pagar Batu Peasant community, while also seeking to comprehend the social movement instigated by the peasants to address the impact of these plantations. The research was conducted using a qualitative method, adopting a case study approach, and gathering primary data through observations, in-depth interviews, and focus group discussions, while secondary data was obtained from documents and profiles. The research findings revealed that the emergence of the social movements primarily resulted from concerns pertaining to conflicting land ownership, monopolization of palm oil, alterations in land utilization, and transformations in people's means of livelihood. The Pagar Batu Peasants openly conducted their social movements to raise awareness and gain attention, employing various strategies such as demonstrations, land reclamation, and, on certain occasions, resorting to physical confrontatio
Human Resources Planning Using Workload and Job Analysis as The Basis of Improving the Organizational Structure in The Marketing (Case Study of Pt. IMST)
Get PDFStrategic planning is crucial for every company to achieve organizational goals, with a focus on effectiveness, efficiency, and productivity in human resource management. Human resource planning involves analyzing workloads in alignment with job descriptions for each position. This research was carried out within PT IMST's Marketing Division, a company operating in the railroad component distribution and trading industry. The primary objective was to examine employee workloads and integrate the findings with job analysis to inform human resource planning. The study revealed that increased market penetration and project demand have led to higher physical and mental workloads for workers. The NASA TLX method was employed to conduct the workload analysis. Based on the research results, it is recommended that the optimal number of personnel be five for each position of Head and Junior Specialist, four for Project Achievement Staff I, three for Project Achievement Staff II, and six for Administrative Staff. To address these staffing needs, human resource planning should prioritize recruiting or adding personnel who possess the requisite qualifications and competencies in accordance with the established positions. By aligning recruitment efforts with the workload analysis and job descriptions, the company can ensure that its workforce is appropriately sized and equipped to efficiently meet market demands and achieve organizational succes
Desain Modul Terapi Sensori Integrasi dan Elemen Estetis Interior dengan Media Puzle Bertekstur
Get PDFSensori integrasi (SI) dipahami sebagai proses mengenal, mengubah, dan membedakan sensasi dari sistem sensori untuk menghasilkan suatu respons berupa “perilaku adaptif bertujuan”. Kemampuan respon adaptif seorang anak, merupakan dasar berkembangnya keterampilan yang lebih komplek. Sensori integrasi dapat mengoptimalkan proses tumbuh kembang anak, khususnya bagi anak dengan gangguan kemampuan terkait sensori perabaan, motorik kasar, motorik halus, kepekaan sendi dan keseimbangan. Semakin sering berlatih, semakin optimal hasilnya. Dengan demikian, semakin banyak orangtua dapat melatih sensori integrasi anak di rumah, semakin besar peluang teratasinya gangguan tersebut. Aktifitas meningkatkan kemampuan sensori integrasi pada anak dapat dilakukan sambil bermain dengan alat permainan yang dapat dimodifikasi sendiri. Seringkali alat-alat terapi tersebut memerlukan ruang penyimpanan tersendiri agar ruangan tetap rapi dan bersih. Penelitian menggunakan metode eksperimen, dengan membuat dan mengujikan modul kepada dua anak berusia 4 tahun, untuk melihat ketercapaian pemenuhan kebutuhan terapi dan komposisi elemen estetis interior. Hasil penelitian berupa modul puzzle bertekstur dengan alternatif komposisi penggunaan modul untuk berbagai kegiatan bermain untuk mengoptimalkan sensori integrasi, serta penyimpanan modul yang sekaligus dapat menjadi elemen estetis interior. Sebagai elemen estetis interior, keberadaan modul terapi dapat menyatu dengan ruangan, memberikan nuansa yang berbeda dan estetis, serta mengurangi kebutuhan sarana penyimpanan
FEASIBILITY ANALYSIS OF KEDIRI - TULUNGAGUNG TOLL USING JICA METHOD
No full textThe Kediri-Tulungagung Toll Road is an essential part of the Non-Trans Java Toll Road, which is a national strategic project aimed at facilitating economic activities in the southern part of East Java and improving connectivity to Kediri Airport. This study focuses on analyzing the economic and financial feasibility of the Kediri-Tulungagung toll road development project.The feasibility study involves assessing the project's viability, determining whether it should proceed or be delayed. The analysis includes evaluating traffic volume data, measuring road saturation levels before and after construction, and analyzing the transfer of road users to the toll road. Furthermore, an economic feasibility analysis is conducted to calculate savings in vehicle operating costs and travel time, as well as assessing metrics such as Benefit-Cost Ratio (BCR), Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PbP). Based on JICA 1 modeling and questionnaire responses, calibration values were determined for different vehicle classes. The economic feasibility analysis reveals a BCR value of 11,656 (BCR>1), an NPV of IDR 91,043,209,729,042 (NPV>0), and an IRR of 18.3811% (IRR>Interest rate). In the financial feasibility analysis using interest rates as discount rates, the BCR is 6,265 (BCR>1), the NPV is Rp 44,977,644,753,162 (NPV>0), the IRR is 11,872% (IRR>Interest rate), and the Payback Period occurs in the 24th year and 7th month after the toll road's operation. Based on these analyses, the Kediri-Tulungagung Toll Road is deemed economically and financially feasible when using interest rates as the discount rate