Modeling and Availability Analysis of Cement Manufacturing Plant Subject to Coverage Factor and Human Failure

The exergy analysis and air pollutants emission estimation from the kiln system of a major cement manufacturing plant located in Nigeria were conducted with a view to improve the level of performance of the production unit and minimize environmental effects. Material balance and exergy analysis were carried out on the system to determine the exergetic efficiency and exergy destruction rate. Pollutants emission was estimated using bottom-up emission factor approach. The physical and chemical exergy output obtained were 9.07×107 and 1.46×08 kJ/h, respectively. The exergy efficiency of the kiln system was 27.35%. The measure of entropy generation (6.53×108 kJ/h) represented a huge potential for energy savings for the unit. CO2 emission represented about 99.04% of the total criteria air pollutants emission from the kiln and an estimate of 0.90 tonnes of CO2/tonne of clinker produced was obtained. To improve the exergy efficiency and reduce pollutants emission from the kiln system, possible heat recovery options and CO2 mitigation approaches were suggested.

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Performance Modeling and Availability Analysis of Screw Manufacturing Plant

Materials Today Proceedings ◽

10.1016/j.matpr.2021.10.170 ◽

2021 ◽

Author(s):

Shikha Bansal ◽

Sohan Lal Tyagi ◽

Vipin Kumar Verma

Keyword(s):

Performance Modeling ◽

Manufacturing Plant ◽

Availability Analysis

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Asbestos and Health in the Third World: The Case of Brazil

International Journal of Health Services ◽

10.2190/3tgt-utuf-hnwr-gcpk ◽

1986 ◽

Vol 16 (2) ◽

pp. 253-263 ◽

Cited By ~ 14

Author(s):

Daniel M. Berman

Keyword(s):

Third World ◽

The United States ◽

Manufacturing Plant ◽

The Third ◽

Asbestos Cement ◽

Cement Manufacturing ◽

The Third World ◽

Almost All ◽

Water Tanks ◽

Present Standard

Almost all of the asbestos used in Brazil is mined by an enterprise wholly owned by two European multinational companies, which also produce and market over two-thirds (by weight of asbestos) of the products made from asbestos. About 80 percent of the asbestos used in Brazil is finally consumed in the form of asbestos cement: for roof tiles and roofing panels, wall-board, and domestic and industrial water tanks. A survey of consumer literature and advertising printed by Eternit, S.A., and Brasilit, S.A., disclosed no mention of a potential danger from exposure to asbestos dust, and no recommendations for cutting down exposure to that dust. The situation at smaller, Brazilian-owned firms is reputed to be disastrous from the standpoint of workers' exposure to asbestos dust at the point of production. At a large asbestos-cement manufacturing plant owned by Eternit, however, exposure to asbestos dust (according to company records) seemed to be kept under 2.0 fibers per cc., the present standard for the United States.

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Performance Analysis of Biscuit Manufacturing Plant in Steady State Using Fuzzy Availability

INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY ◽

10.24297/ijct.v11i4.7043 ◽

2013 ◽

Vol 11 (4) ◽

pp. 2422-2439

Author(s):

Pawan Kumar

Keyword(s):

Steady State ◽

Performance Analysis ◽

Markov Process ◽

Differential Equations ◽

Mathematical Formulation ◽

Manufacturing Plant ◽

Coverage Factor ◽

In Series ◽

Fuzzy Availability

This paper deals with the performance analysis of biscuit manufacturing plant consisting of six sub-systems using fuzzy availability in the steady state. These six sub-systems are arranged in series and parallel configurations. Mathematical formulation of the problem is carried out using Markov process and the governing differential equations are solved in steady state using normalizing condition. The effect of variations of fuzzy availability for different failure, repair rates and system coverage factor for each sub-system in steady state is also studied.

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Copula based Measures of Repairable Parallel System with Fault Coverage

International Journal of Mathematical Engineering and Management Sciences ◽

10.33889/ijmems.2021.6.1.021 ◽

2020 ◽

Vol 6 (1) ◽

pp. 322-344

Author(s):

Vaishali Tyagi ◽

Ritu Arora ◽

Mangey Ram ◽

Ioannis S. Triantafyllou

Keyword(s):

Process Time ◽

Time To Failure ◽

Supplementary Variable ◽

Coverage Factor ◽

Reliability Measures ◽

Failed State ◽

Finite State ◽

Laplace Transformations ◽

Human Failure ◽

Mean Time

The main objective of this study is to analyse the reliability behaviour of parallel systems with three types of failure, namely unit failure, human failure and major failure. For this purpose, we apply three different statistical techniques, namely copula, coverage and copula-coverage. More precisely, this study presents a stochastic model for analysing the behaviour of a multi-state system consisting of two non-identical units by incorporating the concept of coverage factor and two types of repair facilities between failed state to a normal state. The system could be characterized as being in a failed state due to unit failures, human failure and major failures, such as catastrophic and environmental failure. All failure rates are constant and it is assumed that these are exponentially distributed whereas, repair rates follow the Gumbel-Hougaard copula distribution. The entire system is modelled as a finite-state Markov process. Time-dependent reliability measures like availability, reliability and mean time to failure (MTTF) are obtained by supplementary variable techniques and Laplace transformations. The present study provides a comparative analysis for reliability measures among the aforementioned techniques, while a discussion referring to which technique makes the system more reliable is also developed. Furthermore, numerical simulations are presented to validate the analytical results.

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