scholarly journals Potential safety evaluation method based on temperature variation during gas adsorption and desorption on coal surface

2019 ◽  
Vol 113 ◽  
pp. 336-344 ◽  
Author(s):  
Tao Yang ◽  
Peng Chen ◽  
Bo Li ◽  
Baisheng Nie ◽  
Chuanjie Zhu ◽  
...  
Keyword(s):  
Temperature Variation ◽  
Evaluation Method ◽  
Gas Adsorption ◽  
Safety Evaluation ◽  
Coal Surface ◽  
Adsorption And Desorption ◽  
Potential Safety

Study on Safety Assessment Modeling in Sijiaying Open-Pit Iron Mine

2012 ◽  
Vol 429 ◽  
pp. 200-205
Author(s):  
Ming Juan Lu ◽  
Ming Zhu ◽  
Wen Sheng Liu ◽  
Ai Xia Zhang ◽  
Li Xin Ai ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Safety Evaluation ◽  
Mathematic Model ◽  
Evaluation Index System ◽  
Open Pit ◽  
Fuzzy Membership Function ◽  
Analytic Hierarchy ◽  
Potential Safety ◽  
Iron Mine ◽  
Expert Evaluation Method

Based on the analysis of potential safety problems and main factors effecting on safety in mining process, safety evaluation index system was constructed for Sijiaying Open-pit Iron Mine. The fuzzy subjection degrees are determined by setting up the fuzzy membership function, numerical value statistic and expert evaluation method. Analytic hierarchy process and fuzzy set method have been used to build the mathematic model, and then the evaluation results were given for reveal the disfigurement in mining process.

Research on Oil Depot Safety Evaluation Based on Dow Chemical Fire and Explosion Index Assessment Method

2013 ◽  
Vol 748 ◽  
pp. 1256-1261
Author(s):  
Shou Hui He ◽  
Han Hua Zhu ◽  
Shi Dong Fan ◽  
Quan Wen
Keyword(s):  
Production Management ◽  
Evaluation Method ◽  
Risk Index ◽  
Safety Evaluation ◽  
Assessment Method ◽  
Theoretical Ground ◽  
Potential Hazard ◽  
Process Unit ◽  
Safety Production ◽  
Fire And Explosion

At the present time, the Dow Chemical Fire and Explosion Index (F&EI) is a kind of risk index evaluation method that is comprehensively used in evaluating potential hazard, area of exposure, expected losses in case of fire and explosion, etc. As the research object to oil depot storage tank area, this article ultimately confirms establishing appropriate pattern of process unit as well as reasonable safety precautions compensating method, in order to insure the reasonableness of evaluating result, by means of selecting process unit, confirming material factor and compensating safety precautions, using F&EI method. This can provide the basis for theoretical ground in aspect of oil depot development and safety production management.

scholarly journals Study on ecological safety evaluation method for pyrolysis residue of oily sludge

2021 ◽  
Vol 651 (4) ◽  
pp. 042058
Author(s):  
Xuan Sun ◽  
Zhiqiang Guo ◽  
Faguo Zhong ◽  
Zhibin Wu ◽  
Penghui Yang ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Safety Evaluation ◽  
Oily Sludge ◽  
Ecological Safety ◽  
Pyrolysis Residue

Analysis of the Safety Factors of Municipal Road Undercrossing Existing Bridge Based on Fuzzy Analytic Hierarchy Process Methods

2021 ◽  
pp. 036119812110318
Author(s):  
Yonghong Yang ◽  
Yu Chen ◽  
Zude Tang
Keyword(s):  
Safety Assessment ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Safety Evaluation ◽  
Safety Factors ◽  
Analytic Hierarchy ◽  
Road Engineering ◽  
Existing Bridges ◽  
Hierarchy Process ◽  
Engineering Projects

Increasing traffic volume and insufficient road lanes often require municipal roads to be reconstructed and expanded. Where a road passes under a bridge, the reconstruction and expansion project will inevitably have an impact on the bridge. To evaluate the safety impact of road engineering projects on bridges, this paper evaluates the safety of the roads and ancillary facilities of highway bridges involved in municipal road engineering projects. Based on a comprehensive analysis of the safety factors of municipal roads undercrossing existing bridges, a fuzzy comprehensive analytic hierarchy process (AHP) evaluation method for the influence of road construction on the safety of existing bridges is proposed. First, AHP is used to select 11 evaluation factors. Second, the target layer, criterion layer, and index layer of evaluation factors are established, then a safety evaluation factor system is formed. The three-scale AHP model is used to determine the weight of assessment indexes. Third, through the fuzzy comprehensive AHP evaluation model, the fuzzy hierarchical comprehensive evaluation is carried out for the safety assessment index system. Finally, the fuzzy comprehensive evaluation method is applied to the engineering example of a municipal road undercrossing an existing expressway bridge. The comprehensive safety evaluation of the existing bridge reflects the practicability and feasibility of the method. It is expected that, with further development, the method will improve the decision-making process in bridge safety assessment systems.

Reliability and availability evaluation of subsea high integrity pressure protection system using stochastic Petri net

2021 ◽  
pp. 1748006X2110499
Author(s):  
Chuan Wang ◽  
Jun Gou ◽  
Yingcheng Tian ◽  
Hao Jin ◽  
Chao Yu ◽  
...  
Keyword(s):  
Petri Net ◽  
Evaluation Method ◽  
Safety Evaluation ◽  
Diagnostic System ◽  
Test Methods ◽  
Protection System ◽  
Stochastic Petri Net ◽  
Practical Engineering ◽  
Common Cause Failures ◽  
High Integrity

In this paper, a safety evaluation method of subsea High Integrity Pressure Protection System (HIPPS) based on a generalized stochastic Petri net model is proposed. Different test methods were used to detect different types of failures and to analyze the reliability of HIPPS components under the influence of common cause failures and incomplete repair. The reliability curve of a diagnostic system consisting of a transmitter system and a logic system under the influence of uncertainty over time is analyzed. The safety of HIPPS with diverse test methods were quantitatively analyzed. The results show a significant improvement in the performance of the system after testing and maintenance. Both partial-stroke testing and increased partial-stroke test coverage can be used to increase the HIPPS performance compared to traditional methods. The analysis of the Partial stroke test (PST) strategy can afford a academic basis for the selection of PST frequency and Functional test (FT) interval in practical engineering.

Research of Coal Pores and Integrity Evaluation Method Based on Fractal Theory

2014 ◽  
Vol 670-671 ◽  
pp. 258-262 ◽  
Author(s):  
Ji Li ◽  
Xin Wu
Keyword(s):  
Fractal Dimension ◽  
Coal Sample ◽  
Evaluation Method ◽  
Structural Integrity ◽  
Gas Adsorption ◽  
Fractal Theory ◽  
Physical And Mechanical Properties ◽  
Box Dimension ◽  
Sem Images ◽  
Sem Image

Coal is a natural porous media, its porosity and structural integrity influenced the gas adsorption and desorption characteristics greatly, as well as physical and mechanical properties of coal. Scanning electron microscopy (SEM) is applied to acquire SEM image of four kinds of coal samples at different zoom levels, and the box dimension can be worked out based on the pore preprocessing of SEM images. Then, the numerical value of box dimension is used to describe the development degree of the four kinds of coal sample and four development degrees’ sequence. At last, the intrinsic relevance between fractal dimension and other parameters is analyzed through mathematic method. The results show as follows: coal sample has self-similarity characteristic; the fractal dimension is related to both the total number of pores and porosity degree; the data of the coal pore, analyzed through fractal dimension, are consistent with that through traditional method; what’s more, fractal dimension has more advantages in describing accuracy and simplicity.

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