scholarly journals Studi Evaluasi Keselamatan Pada LPG Storage Tank Berdasarkan Tingkat Risiko Menggunakan Metode Risk Based Inspection

2021 ◽  
Vol 2 (2) ◽  
pp. 88-98
Author(s):  
Amam Fachrur Rozie ◽  
D.N Adnyana
Keyword(s):  
Power Plant ◽  
Pressure Vessel ◽  
Storage Tank ◽  
Visual Inspection ◽  
Probability Of Failure ◽  
Risk Matrix ◽  
External Inspection

Analisis risiko merupakan hal yang sangat penting dalam dunia industri baik itu industri manufaktur, power plant, petrokimia, obat-obatan dan tidak terkecuali dengan industri minyak dan gas bumi karena hal tersebut berkaitan dengan keselamatan dan keamanan. Dalam penelitian ini suatu analisis risiko telah lakukan pada suatu bejana tekan (pressure vessel) yang difungsikan sebagai LPG Storage Tank berkapasitas 50 Ton dan telah dipergunakan selama 10 tahun, tujuan dalam penelitian ini adalah untuk mendapatkan informasi terkini dari kondisi terbaru dari LPG Storage Tank tersebut yaitu berupa tingkat risiko, sisa umur, interval inspeksi, metode inspeksi yang tepat, serta mitigasi risiko yang diperlukan dari penggunaan LPG Storage Tank  jika mengalami kegagalan. Analisis secara keseluruhan menggunakan metode Risk Based Inspection (RBI) yang mengacu pada metodologi RBI pada API RP 581. Dalam analisis RBI terdapat 2 variabel utama yang dijadikan pokok dalam proses analisis yaitu kemungkinan terjadi nya kegagalan (Probability of Failure-POF) dan konsekuensi kegagalan (consequences of failure–COF) selain itu dalam penelitian ini menggunakan visual inspection, NDT UT Measurement, dan review document. Dari penelitian ini maka dapat disimpulkan bahwa tingkat risiko dari LPG Storage Tank dalam risk matrix adalah medium-high karena terletak di kolom 1E pada matriks risiko dengan interval inspeksi adalah 5 tahun untuk internal & external inspection dan nilai laju korosi yang terjadi pada LPG Storage Tank adalah sebesar 0,057 mm/yr dengan sisa umur pakai dari LPG Storage Tank adalah sebesar 24 tahun.

Development of an Integrity Evaluation System on the Basis of Cooperative Virtual Reality Environment for Nuclear Power Plant

2004 ◽  
Author(s):  
J. C. Kim ◽  
J. B. Choi ◽  
Y. H. Choi
Keyword(s):  
Virtual Reality ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Pressure Vessel ◽  
Evaluation System ◽  
Nuclear Power ◽  
Structural Integrity ◽  
Reactor Pressure Vessel ◽  
Virtual Reality Environment ◽  
Reactor Pressure

Since early 1950’s fracture mechanics has brought significant impact on structural integrity assessment in a wide range of industries such as power, transportation, civil and petrochemical industries, especially in nuclear power plant industries. For the last two decades, significant efforts have been devoted in developing defect assessment procedures, from which various fitness-for-purpose or fitness-for-service codes have been developed. From another aspect, recent advances in IT (Information Technologies) bring rapid changes in various engineering fields. IT enables people to share information through network and thus provides concurrent working environment without limitations of working places. For this reason, a network system based on internet or intranet has been appeared in various fields of business. Evaluating the integrity of structures is one of the most critical issues in nuclear industry. In order to evaluate the integrity of structures, a complicated and collaborative procedure is required including regular in-service inspection, fracture mechanics analysis, etc. And thus, experts in different fields have to cooperate to resolve the integrity problem. In this paper, an integrity evaluation system on the basis of cooperative virtual reality environment for reactor pressure vessel which adapts IT into a structural integrity evaluation procedure for reactor pressure vessel is introduced. The proposed system uses Virtual Reality (VR) technique, Virtual Network Computing (VNC) and knowledge based programs. This system is able to support 3-dimensional virtual reality environment and to provide experts to cooperate by accessing related data through internet. The proposed system is expected to provide a more efficient integrity evaluation for reactor pressure vessel.

Experimental and Numerical Analysis of Mixing Process of Two Component Gases in a Vertical Fluid Layer in a VHTR

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Tetsuaki Takeda
Keyword(s):  
High Temperature ◽  
Natural Convection ◽  
Numerical Analysis ◽  
Pressure Vessel ◽  
Storage Tank ◽  
Molecular Diffusion ◽  
Flow Characteristics ◽  
Mixing Process ◽  
Two Component ◽  
Air Ingress

When a depressurization accident of a very-high-temperature reactor (VHTR) occurs, air is expected to enter into the reactor pressure vessel from the breach and oxidize in-core graphite structures. Therefore, in order to predict or analyze the air ingress phenomena during a depressurization accident, it is important to develop a method for the prevention of air ingress during an accident. In particular, it is also important to examine the influence of localized natural convection and molecular diffusion on the mixing process from a safety viewpoint. Experiment and numerical analysis using a three-dimensional (3D) computational fluid dynamics code have been carried out to obtain the mixing process of two-component gases and the flow characteristics of localized natural convection. The numerical model consists of a storage tank and a reverse U-shaped vertical rectangular passage. One sidewall of the high-temperature side vertical passage is heated, and the other sidewall is cooled. The low-temperature vertical passage is cooled by ambient air. The storage tank is filled with heavy gas and the reverse U-shaped vertical passage is filled with a light gas. The result obtained from the 3D numerical analysis was in agreement with the experimental result quantitatively. The two component gases were mixed via molecular diffusion and natural convection. After some time elapsed, natural circulation occurred through the reverse U-shaped vertical passage. These flow characteristics are the same as those of phenomena generated in the passage between a permanent reflector and a pressure vessel wall of the VHTR.

scholarly journals Design and Fabrication of a Modified Portable Biogas Digester for Renewable Cooking-Gas Production

2018 ◽  
Vol 3 (3) ◽  
pp. 21
Author(s):  
Barinyima Nkoi ◽  
Barinadaa Thaddeus Lebele-Alawa ◽  
Benedict Odobeatu
Keyword(s):  
Pressure Vessel ◽  
Storage Tank ◽  
Raw Materials ◽  
Gas Production ◽  
Smoke Detector ◽  
Cow Dung ◽  
Nickel Steel ◽  
Cylindrical Pressure Vessel ◽  
Test Pressure ◽  
Materials Used

This research paper focuses on re-engineering design and fabrication of a modified potable biogas digester for the production of biogas as a renewable energy source for domestic use. Digesters used around the world are commonly big in size. There is need to modify and re-engineer an existing biogas digester to fit in to modern day design for better efficiency, portability and safety. Floating drum and Flexible balloon are digesters to be modified as a thin walled pressure vessel with radius-thickness ratio  greater than 10. ASME codes and standards were used to carry out the sizing calculations, thickness and pressure calculations for the cylindrical pressure vessel shells and also calculations for the storage tank hemisphere shell. AISI 304 (Chromium-Nickel steel) is used for the vessel shell and the maximum allowable stress is 137 MPa. Weld efficiency (85%), corrosion allowance (0.02mm),  of 24 (for digester),  of 18 (for collector) and  of 20 (storage tank). 17 kg of cow dung and 34 kg of water with temperature of 32oC were the raw materials used for this research to produce a cumulative gas volume of 0.1243 m3 for 30 days. Furthermore, a bike pump is modified and used to increase methane gas pressure from 4.903 kPa to 345 kPa to suit the modern day gas cookers design and storage tank. Unlike other biogas plant, an electronic smoke alarm detector (model: Ei100) is placed 300 mm below the digester top for effective fire protection. Series of tests were performed to ensure that the constructed prototype met the specifications/standards. Such test include, smoke detector test, pressure testing, gas leak test, and a unit test run also confirmed that the aim of research was achieved.

scholarly journals Visual Inspection System for Insulators in Power Plant.

1993 ◽  
Vol 11 (7) ◽  
pp. 1093-1104
Author(s):  
Miwako HIROOKA ◽  
Yasushi YAGI ◽  
Shinjiro KAWATO
Keyword(s):  
Power Plant ◽  
Visual Inspection ◽  
Inspection System

Volume Sizing for Thermal Storage With Phase Change Material for Concentrated Solar Power Plant

2014 ◽  
Author(s):  
Ben Xu ◽  
Peiwen Li ◽  
Cholik Chan
Keyword(s):  
Power Plant ◽  
Phase Change ◽  
Phase Change Material ◽  
Storage Tank ◽  
Solar Power ◽  
Heat Storage ◽  
Storage System ◽  
Thermal Storage ◽  
Concentrated Solar Power ◽  
Change Material

With a large capacity thermal storage system using phase change material (PCM), Concentrated Solar Power (CSP) is a promising technology for high efficiency of solar energy utilization. In a thermal storage system, a dual-media thermal storage tank is typically adopted in industry for the purpose of reducing the use of the heat transfer fluid (HTF). While the dual-media sensible heat storage system has been well studied, a dual-media latent heat storage system (LHSS) still needs more attention and study; particularly, the sizing of volumes of storage tanks considering actual operation conditions is of significance. In this paper, a strategy for LHSS volume sizing is proposed, which is based on computations using an enthalpy-based 1D model. One example of 60MW solar thermal power plant with 35% thermal efficiency is presented. In the study, potassium hydroxide (KOH) is adopted as PCM and Therminol VP-1 is used as HTF. The operational temperatures of the storage system are 390°C and 310°C, respectively for the high and low temperatures. The system is assumed to operate for 100 days with 6 hours charge and 6 hours discharge every day. From the study, the needed height of the thermal storage tank is calculated from using the strategy of tank sizing. The method for tank volume sizing is of significance to engineering application.

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