Application of safety and reliability analysis in wastewater reclamation system

2021 ◽  
Vol 146 ◽  
pp. 338-349
Author(s):  
Qi-yu Zhang ◽  
Lai-sheng Liu ◽  
Zeng-jin Liu
Keyword(s):  
Reliability Analysis ◽  
Wastewater Reclamation ◽  
Safety And Reliability ◽  
Reclamation System

Reliability Analysis of Redundant Dynamic Positioning Control System With Human Factor Involved

2016 ◽  
Author(s):  
Fang Wang ◽  
Yong Bai ◽  
Feng Xu
Keyword(s):  
Control System ◽  
Markov Process ◽  
Reliability Analysis ◽  
Oil And Gas ◽  
Dynamic Positioning ◽  
Positioning Control ◽  
Safety And Reliability ◽  
Long Time ◽  
Component Failure Rates ◽  
Technical Failures

Deepwater oil and gas explorations bring more safety and reliability problems for the dynamically positioned vessels. With the demands for the safety of vessel crew and onboard device increasing, the single control architecture of dynamic positioning (DP) system can not guarantee the long-time faultless operation for deeper waters, which calls for much more reliable control architectures, such as the Class 2 and Class 3 system, which can tolerate a single failure of system according to International Maritime Organization’s (IMO) DP classification. The reliability analysis of the main control station of DP Class 3 system is proposed from a general technical prospective. The fault transitions of the triple-redundant DP control system are modeled by Markov process. The effects of variation in component failure rates on the system reliability are investigated. Considering the DP operation involved a human-machine system, the DP operator factors are taken into account, and the human operation error failures together with technical failures are incorporated to the Markov process to predict the reliability of the DP control system.

Developing an Efficient Approach for Unmanned Aerial Vehicle Reliability Analysis

2020 ◽  
Author(s):  
Ahmad Khayyati ◽  
Mohammad Pourgol-Mohammad
Keyword(s):  
Reliability Analysis ◽  
Block Diagram ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Dynamic Fault Tree ◽  
Safety And Reliability ◽  
Time Dependencies ◽  
Aerial Vehicle ◽  
Redundant Component ◽  
High Level

Abstract Unmanned Aerial Vehicles (UAV) are increasingly get popularity in many applications. Their operation requires high level of safety and reliability to accomplish successful missions. In this study, the reliability was comparatively analyzed by different available approaches to select the efficient method. First, failure model of the system is developed. Then, three different scenarios are considered to study the effect of redundancies on the system reliability results. In the first scenario, there is no redundancy where in the second scenario there is only one redundant component and in the third scenario, there are three redundant components. Static reliability analysis such as Fault Tree Analysis (FTA), Reliability Block Diagram (RBD), Markov Chain (MC), and Bayesian Networks (BN) are applied on proposed scenarios and results are obtained. Regarding to time dependencies between redundant components, a dynamic-based methodology is also developed in this study through applying Dynamic Fault Tree (DFT) analysis. Proposed static and dynamic approaches are applied on an UAV as a case study and results are discussed. Finally, characteristics of each methodology and related conditions are clarified for selecting the efficient reliability analysis approach.

Removal of Potential Carcinogens and Toxicants by Treatment Systems for Direct and Indirect Reuse of Wastewater Evaluated by Means of a Hamster Cell Culture Assay

1982 ◽  
Vol 14 (4-5) ◽  
pp. 355-363
Author(s):  
R Kfir ◽  
O W Prozesky
Keyword(s):  
Cell Culture ◽  
Cell Growth ◽  
Cell Transformation ◽  
Health Hazard ◽  
Wastewater Reuse ◽  
Wastewater Reclamation ◽  
Transforming Activity ◽  
Reuse System ◽  
Cell Culture Assay ◽  
Reclamation System

Removal of potential carcinogens and toxicants by a direct wastewater reclamation system and an indirect wastewater reuse system was evaluated by means of a sensitive golden hamster cell transformation assay. Representative water samples from various stages of both the direct and the indirect reuse systems were introduced to the hamster cells and changes in the rate and pattern of cell growth were observed. Both systems proved to be highly effective in their removal of potential carcinogens and toxicants and there is no indication that the slight toxic and transforming activity detected in their final water may constitute a health hazard.

Implementation of the Cracow municipal wastewater reclamation system for industrial water reuse

Desalination ◽  
1996 ◽  
Vol 106 (1-3) ◽  
pp. 183-193
Author(s):  
Jerzy Kurbiel ◽  
Krystyna Żeglin ◽  
Stanisław M. Rybicki
Keyword(s):  
Water Reuse ◽  
Municipal Wastewater ◽  
Industrial Water ◽  
Wastewater Reclamation ◽  
Reclamation System

SAFETY AND RELIABILITY ANALYSIS OF PROTECTION SYSTEMS FOR POWER SYSTEMS

2006 ◽  
Vol 39 (5) ◽  
pp. 383-388
Author(s):  
Luca Ferrarini ◽  
Leonardo Ambrosi ◽  
Emanuele Ciapessoni
Keyword(s):  
Power Systems ◽  
Reliability Analysis ◽  
Protection Systems ◽  
Safety And Reliability
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