Identification and Control of Hazard in Underground Blasting

2014 ◽  
Vol 926-930 ◽  
pp. 4097-4100
Author(s):  
Dong Tao Hu
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Underground Blasting ◽  
Tree Analysis ◽  
Cut Set ◽  
And Control

To prevent underground blasting accidents, fault tree analysis (FTA), a method for identifying and evaluating hazard in safety theory, is used to throughly analyze underground blasting technology. With calculating the minimum cut set and path set, causes of blasting accidents are determined. And corresponding preventions are formulated.

Analysis on Dynamic Fault Tree Based on Fuzzy Set

2011 ◽  
Vol 110-116 ◽  
pp. 2416-2420 ◽  
Author(s):  
Li Ping Yang
Keyword(s):  
Fuzzy Set ◽  
Fault Tree ◽  
Dynamic Logic ◽  
Fault Tree Analysis ◽  
Logic Gates ◽  
Minimum Cut ◽  
Tree Analysis ◽  
Dynamic Fault Tree ◽  
Large Complex System ◽  
Cut Set

In case of fault tree analysis of large complex system, the probability of bottom event in dynamic fault tree is uncertain in some cases. To address the problem, the paper presented a dynamic fault tree analysis method based on fuzzy set computation. The method separates logic attributes and timing attributes of dynamic logic gates. It can convert dynamic fault tree into static fault tree not considering timing constraints and obtain minimum cut set of static fuzzy fault tree with set operations, then the concept of minimum cut set is extended to dynamical minimum cut sequence. Thus, the dynamic fault tree was analyzed in both qualitative and quantitative aspects, which solve the problem that it is difficult to assign value of event probability in previously process.

Fault Tree Analysis on Ship Dangerous Chemicals Leakage Emergency in Three Gorges Reservoir Area

2012 ◽  
Vol 610-613 ◽  
pp. 743-747
Author(s):  
Hai Yan Li ◽  
Guo Bin Wu
Keyword(s):  
Qualitative Analysis ◽  
Three Gorges Reservoir ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Three Gorges Reservoir Area ◽  
Minimum Cut ◽  
Three Gorges ◽  
Tree Analysis ◽  
Minimum Path ◽  
Cut Set

This paper conducts the fault tree analysis on Ship Dangerous Chemicals Leakage emergency of Three Gorges Lock with the method of safety system engineering, draws a map of fault tree analysis, representing intuitively the basic events which can bring about top events as well as the logic relationships between them, obtains the minimum cut set, minimum path set and structure importance through qualitative analysis of FTA, and points out the possible ways to prevent the occurrence of accidents.

FTAe – Fault Tree Analysis in Microsoft Excel

2014 ◽  
Vol 889-890 ◽  
pp. 591-594
Author(s):  
Richard Kuracina ◽  
Denis Šandor ◽  
Karol Balog
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Software Tool ◽  
Short Description ◽  
Microsoft Excel ◽  
Tree Analysis ◽  
Minimal Cut Sets ◽  
Minimal Cut ◽  
Cut Set

FTAe is software tool for Fault Tree Analysis in Microsoft Excel. This paper is focused on short description of created FTAe. A brief description of Fault Tree Analysis is in the first part of paper. The Structure, Logic and Minimal Cut Sets in Fault Tree analysis is described too. Next part of this paper is focused on the choice of algorithm for cut set calculation and brief description of structure of FTAe. Finally, advantages of FTAe software in Microsoft Excel are described in conclusions.

Reliability Analysis of Ventilation System Based on Fuzzy Fault Tree

2013 ◽  
Vol 634-638 ◽  
pp. 3670-3677 ◽  
Author(s):  
Jun Meng
Keyword(s):  
Ventilation System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Feedback System ◽  
Mine Ventilation ◽  
Gansu Province ◽  
Elementary Event ◽  
Minimum Cut ◽  
Cut Set ◽  
Level 1

The fuzzy Fault Tree Analysis (FTA) of mine ventilation system is set up based on thorough composition of the system, with triangular fuzzy number being used as probability of elementary event and “mine ventilation system fault” being deemed as top event. In this paper, the reliability of FTA has been analyzed and applied to a mine in Gansu Province. The result shows that the minimum cut set of fault tree is 549 and the main reason why it has a huge number of minimum cut set is Level 1，Event 7，“Monitoring feedback system failure”. The reliability of top event and Level 1 event is low, and fuzzy failure probability of top event is (0.009, 0.014, 0.009), the maximum of which is 2.3% of it. The degree of fuzzy importance of elementary event is the highest in Level 1，Event 7. The maximum of fuzzy importance is 0.0843 by the normalization and the rest vary from 0.0050 to 0.0100 mostly.

An Application of Fault Tree Analysis for Decommissioning of Subsea Flexible Pipeline in Brazil

2019 ◽  
Author(s):  
Rafaela Ramos ◽  
Ilson Pasqualino ◽  
Marcelo Igor L. Souza ◽  
Eduardo Ribeiro Nicolosi
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Third Order ◽  
Tree Analysis ◽  
First Order ◽  
Minimal Cut Set ◽  
Minimal Cut ◽  
Cut Set ◽  
Subsea Pipelines ◽  
Underwater Structures

Abstract The decommissioning of underwater structures has expanded in recent years, as the number of facilities at the end of their useful lives is increasing and legislation becomes more severe. Unlike the production units which already have their decommissioning plans consolidated, subsea pipelines represent the greatest technological, environmental and financial challenge of this stage. Currently, there are few studies to evaluate failures in the decommissioning of flexible pipelines. In addition, these studies generally use simplified analyses. Therefore, this study aims to elaborate a failure analysis for a Reverse Reeling option, in order to contribute to the decision-making process and reduction of failures. For this, a Fault Tree Analysis will be developed followed by the subsequent elaboration of its minimum cut sets. The main results present a total of 13 first-order minimal cut set, 5 second-order minimal cut set and 7 third-order minimal cut set.

Analisis Penurunan Capaian Target Produksi Bijih Nikel Menggunakan Metode Fault Tree Analysis di PT Ifishdeco Provinsi Sulawesi Tenggara

2020 ◽  
Vol 24 (1) ◽  
pp. 45-50
Author(s):  
Aryanti Virtanti Anas ◽  
Yoshita P Parissing ◽  
Irzal Nur ◽  
Sufriadin Sufriadin ◽  
Purwanto Purwanto ◽  
...  
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Top Down ◽  
Tree Analysis ◽  
Minimal Cut Set ◽  
Minimal Cut ◽  
Selective Mining ◽  
Cut Set ◽  
Production Target ◽  
Main Factor

Abstrak Proses produksi berarti menghasilkan suatu produk yang bernilai guna. Dalam suatu perusahaan pertambangan, produksi merupakan hal yang sangat penting, sehingga diperlukan perencanaan yang matang. Perusahaan menargetkan jumlah bahan galian yang akan diproduksi baik dalam jangka panjang, menengah maupun jangka pendek. Operasi produksi PT. Ifishdeco menggunakan bantuan alat gali muat excavator Komatsu PC 300 dimana terjadi penurunan produksi bijih nikel sebesar 19,94%. Target produksi sebesar 149.934 mt, namun capaian produksi hanya sebesar 116.603mt. Oleh karena itu, penelitian ini dilakukan untuk mengetahui faktor utama dan nilai probabilitas penyebab turunnya capaian produksi. Salah satu metode yang dapat digunakan untuk menganalisis faktor utama penyebab penurunan capaian produksi adalah menggunakan Fault Tree Analysis (FTA). Persamaan logika top down dari Fault Tree Analysis disubstitusi ke dalam aljabar Boolean hingga diperoleh minimal cut set. Minimal cut set merupakan persamaan akhir yang merincikan top down. Top event penurunan capai target produksi memiliki empat top down, yaitu faktor pengisian, kesiapan fisik alat, efektivitas kerja, dan waktu edar alat gali muat. Berdasarkan nilai probabilitas basic event tertinggi yang bernilai 1, maka faktor utama penyebab penurunan capaian produksi adalah dari faktor umur pakai alat tua, penjadwalan perawatan tidak teratur, kualitas alat buruk, dan proses selective mining.   Abstract Analysis of Decrease in Nickel Ore Production Targets Using the Fault Tree Analysis Method in PT Ifishdeco, Southeast Sulawesi Province. Production process meant produce product with beneficial value. At the mining company, production was very important, so it needed to be well-planned. Company was making target amount of digging material to be produced in long term, middle term, and short term. Production operation at PT Ifishdeco utilized digger loader equipment namely excavator Komatsu PC 300. There was decreasing in nickel ore production of 19,94%. Production target was 149,934 mt, but the company was only able to meet 116,603 mt. Objective of this study was to know main factor and probability value which caused the low production performance. One of methods to be used to analyze the main factor was Fault Tree Analysis (FTA). Top down logical equations of Fault Tree Analysis was substituted into Boolean algebra to get minimal cut set. Minimal cut set was a formula of the top down and used to calculate probability. Top event of the decreasing of the production target had four top downs which were filling factor, mechanical availability, effectivity of use, and cycle time of digger loader. Based on the highest probability of basic event which value was equal to 1, the main factor caused the decreasing of productivity were lifetime of equipment, unscheduled of maintenance, low quality of equipment, and selective mining.   Kata Kunci: Excavator, Work Effectivity, Boolean, Cut Set, Probability

scholarly journals Identifikasi Faktor-Faktor Penyebab Berkontribusi Terjadinya Kegagalan Konstruksi Jalan dengan Metode Fault Tree Analysis (FTA)

2021 ◽  
pp. 53-63
Author(s):  
Utami Dewi Arman Arman ◽  
Jihan Melasari ◽  
Septia Edrian Saputri
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Tree Analysis ◽  
Cut Set

Kegagalan konstruksi merupakan suatu kondisi penyimpangan, kesalahan dan kerusakan dari hasil pekerjaan konstruksi yang dapat mengakibatkan keruntuhan bangunan atau konstruksi. Penelitian ini bertujuan untuk mengidentifikasi faktor-faktor yang berkontribusi terjadinya kegagalan struktur jalan Bukit Manggis Kabupaten Solok Selatan menurut persepsi para stakeholder proyek. Metode penelitian menggunakan metode deskriptif kualitatif melalui observasi di lokasi proyek dan wawancara mendalam kepada para stakeholder. Hasil data wawancara dianalisis menggunakan metode Fault Tree Analysis (FTA) dan Methode for Obtaining Cut Set (MOCUS). Berdasarkan hasil identifikasi, di peroleh 7 (tujuh) faktor-faktor yang berkontribusi terjadinya kegagalan pada struktur jalan yaitu; (1) Perencanaan, (2) Pelaksanaan, (3) Bencana alam, (4) Komunikasi, (5) Budaya organisasi, (6) Biaya serta (7) Kondisi iklim.  Faktor-faktor kegagalan konstruksi paling dominan menurut persepsi stakeholder adalah bencana alam, kondisi iklim, budaya organisasi dan komunikasi. Maka dari itu, diharapkan masing-masing stakeholder memberikan perhatian khusus terhadap faktor penyebab yang telah diidentifikasi.

scholarly journals PENGEMBANGAN RISK ASSESSMENT DALAM EVALUASI MANAJEMEN PENANGGULANGAN KEBAKARAN MELALUI FAULT TREE ANALYSIS

2016 ◽  
Vol 5 (1) ◽  
pp. 36
Author(s):  
Annisa Sholikhatul Addawiyah ◽  
Rudatin Windraswara
Keyword(s):  
Risk Assessment ◽  
Management System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Tree Analysis ◽  
Undesirable Event ◽  
Regulatory Standards ◽  
Intermediate Event ◽  
Conditioning Event

Fault tree analysis adalah suatu penilaian risiko yang mampu mengidentifikasi potensi bahaya secara spesifik, fokus, rinci pada satu kejadian yang tidak diinginkan, dan mengetahui penyebab kejadian tersebut beserta angka probabilitasnya. Tercatat mulai tanggal 1 Januari – 30 April 2014 terjadi kebakaran sebanyak 10 kali di divisi spinning PT. Apac Inti Corpora dengan kasus tertinggi di unit spinning V (50% kejadian).Tujuan penelitian ini adalah mengetahui faktor penyebab kebakaran, mengembangkan penilaian risiko, dan mengetahui gambaran umum sistem manajemen penanggulangan kebakaran di unit spinning V PT. AIC. Desain penelitian ini adalah kualitatif eksplanatoris. Hasil pengembangan bagan fault tree analysis didapatkan 41 basic event, 24 intermediate event, 1 conditioning event, dan 1 undeveloped event yang secara matematis melalui persamaan aljabar boolean akan menghasilkan 35 single minimum cut sets dan 5 double component cut sets, dengan perhitungan angka probabilitas sebesar 0,3552. Hasil kesesuaian sistem manajemen penanggulangan kebakaran didapatkan 76 poin dari 81 poin standar regulasi yang berlaku di Indonesia. Simpulan penelitian ini adalah kemungkinan terjadinya kebakaran di spinning V sebesar 35,52%. Saran dari penelitian ini adalah dilakukannya evaluasi terhadap kegagalan deteksi dini dan kegagalan teknis. Fault tree analysis has advantages in identifying potential hazards in specifics, focus, detail on a potential undesirable event that called top event, and was able to find out the causes with the value of probability. Recorded at January 1th – April 30th, 2014, there had been 10 cases of fires in the spinning PT. Apac Inti Corpora with the highest cases at spinning V (50% event). The purpose of this research was find out the cause of fires, develop a risk assessment, and learn an overview of fires countermeasures management system in spinning V. This research was a qualitative – explanatory design. Result of development fault tree analysis brings about 41 basic event, 24 intermediate event, 1 conditioning event, dan 1 undeveloped event  by boolean algebra, mathematically generates 35 single minimum cut sets and 5 double component cut sets, with the value of probability is 0,3552. Whereas the countermeasure of fire management system conformity obtained 76 points is according from 81 points of regulatory standards in Indonesia. Summary, spinning unit V had the possibility of going fires is 35,52%. Advice, conducted evaluation of failure from early detection and technical failures in the production process.

Rapidly Analyze the Fault Tree with Numerical Methods

2014 ◽  
Vol 596 ◽  
pp. 209-215
Author(s):  
Bing Wu ◽  
Zi Hao Zhao ◽  
Yu Hui Ren
Keyword(s):  
Numerical Calculation ◽  
Numerical Methods ◽  
Qualitative Analysis ◽  
Prime Number ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
New Method ◽  
Minimum Cut ◽  
Tree Analysis

In order to take advantage of the computer in the numerical calculation, in view of the fault tree qualitative analysis, a new method of fault tree analysis, numerical methods, was proposed on the basis of absorbing merits of the prime number method and determinant method. The fault tree's minimum cut sets and path sets can be calculated effectively with this method. Consequently, a specific example about calculation of the minimum cut sets was demonstrated with Scilab in this paper.

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