scholarly journals DFTCalc: Reliability Centered Maintenance via Fault Tree Analysis (Tool Paper)

2015 ◽  
pp. 304-311 ◽  
Author(s):  
Dennis Guck ◽  
Jip Spel ◽  
Mariëlle Stoelinga
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Analysis Tool ◽  
Tree Analysis ◽  
Reliability Centered Maintenance

Model-Based Risk Assessment of Offshore Operations

2014 ◽  
Author(s):  
Christoph Läsche ◽  
Jan Pinkowski ◽  
Sebastian Gerwinn ◽  
Rainer Droste ◽  
Axel Hahn
Keyword(s):  
Risk Assessment ◽  
Process Model ◽  
Expert Knowledge ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Specification Language ◽  
Specific Situation ◽  
Analysis Tool ◽  
Tree Analysis ◽  
Offshore Operations

Safety and dependability are major design objectives for offshore operations such as the construction of wind farms or oil and gas exploration. Today processes and related risks are typically described informally and process specification are neither reusable nor suitable for risk assessment. Here, we propose to use a specification language for processes. We integrate this specification language in a generic modeling approach in combination with an analysis tool and a tool to construct health, safety and environment (HSE) plans — a mandatory document for granting a construction/operation permit. Specifically, for each planned scenario a process is modeled, describing the detailed operation of the involved actors as well as the interaction with resources and environmental conditions. We enrich this process model with hazardous events which is facilitated by integration with an offshore operation generic hazard list, thereby giving access to expert knowledge for the specific situation to be planned. This in turn allows us to perform an automatic quantitative risk assessment using fault tree analysis. We exemplify our approach on a standard offshore operation of personnel transfer from an offshore building to another naval unit by modeling, annotating with hazards, performing the fault-tree analysis, and finally generating HSE plans.

scholarly journals Sterilizer Reliability Analysis Using Reliability Block Diagram Based on Failure Identification Through Fault Tree Analysis

2021 ◽  
Vol 2 (1) ◽  
pp. 38-44
Author(s):  
Syamsul Bahri ◽  
Fatimah Fatimah ◽  
Saifuddin Muhammad Jalil ◽  
Amri Amri ◽  
Muhammad Ilham
Keyword(s):  
Block Diagram ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Ball Valve ◽  
Exhaust Valve ◽  
Analysis Tool ◽  
Tree Analysis ◽  
Reliability Block Diagram ◽  
Maintenance Schedule ◽  
Critical Components

A sterilizer is a pressurized steam vessel used to boil palm oil. The condition of the sterilizer at PT .X often emits steam at the door and body of the stew. Throughout 2020, there were 12 critical components that were frequently damaged, such as ball valve, actuator, exhaust valve, packing door, elbow, condensate nozzle, liner, pipe, condensate valve, strainer valve, pipe flange, and packing flange. Fault Tree Analysis is an analysis tool that graphically translates the combinations of errors that cause system failures. Reliability Block Diagram is a diagramming method for showing how reliability components contribute to the success or failure of a complex system. Based on the results of the failure calculation using fault tree analysis, the probability of failure of the horizontal sterilizer component is the ball valve 12.2%, exhaust valve 10.9% actuator 6%, door packing 0.24%, elbow 0.24%, condensate nozzle 4.8%, liner 8.61%, 0.25% pipe, 0.21% condensate valve, 4.4% filter valve, 0.22% pipe flange and 0.27% packing flange. The reliability value of the horizontal sterilizer from the calculation using the reliability block diagram is 85.69% if it operates for 8 hours, 62.93% if it operates for 27 hours, 39.6% if it operates for 54 hours, 13.34% if it operates for 117 hours. o'clock. o'clock. o'clock. hours and 1.81% when operating for 234 hours. To maintain reliability above 60%, the preventive maintenance schedule is: Every 80 hours of operation a door packing inspection is carried out. Every 234 hours of operation, elbow tubing and flanges are checked. Every 300 hours of operation, a pipe inspection is carried out. Every 450 operational hours an inspection is carried out on the ball valve, condensate nozzle, liner, actuator, and exhaust valve. Every 30 hours of operation, valve condensate, filter valves and packing flanges are checked.

PLFaultCAT: A Product-Line Software Fault Tree Analysis Tool

2006 ◽  
Vol 13 (1) ◽  
pp. 169-193 ◽  
Author(s):  
Josh Dehlinger ◽  
Robyn R. Lutz
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Product Line ◽  
Analysis Tool ◽  
Tree Analysis ◽  
Software Fault

Application of Fault Tree Analysis for Signaling Systems

2015 ◽  
Author(s):  
Sofia K. Georgiadis
Keyword(s):  
Failure Analysis ◽  
Failure Modes ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Safety Analysis ◽  
Valuable Insight ◽  
Analysis Tool ◽  
Tree Analysis ◽  
Signaling Systems ◽  
Analysis Techniques

Fault Tree Analysis (FTA) is one of the key safety evaluation techniques used by New York City Transit (NYCT). First developed over 50 years ago, this technique continues to provide valuable insight for failure analysis of systems. Its use is widespread in safety-critical systems analysis across industry boundaries, including defense, nuclear, aerospace, chemical [1], and transportation industries. FTAs provide a systematic, top-down methodology to safety analysis. As such, it complements other safety analysis techniques, such as Failure Modes Effect Analysis (FMEA), which is a bottom-up failure analysis [2]. Formal Methods analyses, including Theorem Proving and Model Checking, are powerful development and analysis methodologies, both used by NYCT, that provide assurance of product’s correctness and safety. With these other safety analysis techniques, the FTA continues to play a key role in the NYCT Safety Program. This paper will examine how NYCT uses FTAs for the safety analysis of microprocessor-based signaling systems. FTAs are used by NYCT throughout the system lifecycle. Initially, during the system development phase, NYCT requires system suppliers to develop Fault Tree Analyses of their systems, as a requirement for NYCT safety certification and deployment. For the system maintenance phase, NYCT uses the outputs of suppliers’ analyses to develop and enforce maintenance and operational procedures. In this manner, NYCT’s use of FTA provides full lifecycle value by providing design, maintenance, and operational insight into the causes of hazardous events. Through the examination of example fault trees and an overview of the FTA process, this paper will present the NYCT’s implementation of this powerful analysis tool, and will describe the benefits gained from using this methodology.

Sign in / Sign up

Export Citation Format

Share Document