Sharif Digital Repository

mazandaran cement co.( the second biggest cement company in Iran) is located in Mazandaran province north of Iran. Thesis is about the weakness and strength points of available maintenance strategy (which is mostly CBM) in this company and offers some remedies to enhance the current maintenance situation. Maintenance information is assessed over a period of two years in a row and turn into some informative charts and diagrams for easier exploration. Eventually, some solutions are suggested for omitting shortages in current maintenance strategy  

This project is providing appropriate software which could manage maintenance activities in a plant. All sections of the software have been designed in a way that can ease the management of maintenance activities. There are about 100 forms in the software that have been designed according to the forms which are being used in some Iranian cement plants and other maintenance software and also what we recognized important to be added or designed. One of the most important aspect of this software is the analytical section of the software where the user can get analytical reports from the software and based on the reports judge about the status of the plant and make new decisions in order to... 

In order to survive in the competitive market, companies should increase the availability of plants. In order to increase the availability of a system, the occurrence of failures should be decreased. It is not possible to eliminate all of failures simultaneously. It means, it is not cost effective and logical to concentrate on elimination of all failures. In Addition, the cause of some failures might not be eliminated. So, the occurrence of those failures should be postponed to the later time as much as possible. Therefore, the critical failure modes should be identified to be concentrated for further analysis. Ultimately; the root causes of these failures should be explored and if it is... 

This study was conducted at one of the leading manufactures of detergents and hygienic products in Iran. It is a common practice there to repair equipments after they have breakdown therefore there is not much preventive maintenance tasks done there in spite of contracting out maintenance and preventive maintenance plans which are distributed every month to technical departments. As today competitive pressures have increased by imported commodities and difficulty in buying new machines, companies should learn how to revive their businesses and exploit equipment efficiently to reduce the high level of capital associated with equipment malfunctions. One of the methodologies applied world wide... 

Water is crucial to human being. We use water for a wide variety of uses daily. However, leakage has caused substantial water loss to our precious processed water. The major contributor to non-revenue water in Iran is pipeline leakages. The water industry in the nation has invested in equipment to detect and localize leaks in water distribution systems. One of the equipment mentioned is acoustic-based. The principle of acoustic is that whenever a leak is present in a pipeline, noise is generated and will travel along the pipeline. The acoustic leak detection method is then derived by calculating the distance traveled by this noise generated by the leak. Different equipment based on acoustic... 

Performance measurement and its information enable managers for better control and management of their processes. Since, rolling stock maintenance process is a dominant supporting process, which plays a key role in the reliability, safety and quality of service delivery in railway passenger transportation, this thesis is aimed to study the performance measurement of rolling stock maintenance process. The scope of this research work is to study the concept and state-of-the-art of measuring performance with specific reference to maintenance; to study and discuss relevant issues and challenges; to study and analyze current practices in maintenance process of Iranian passenger railway system... 

Many airlines operate different fleets under different service conditions. These aircraft fleets need to be maintained in service. Safety, reliability and economic reasons motivate manufacturers, airlines and airworthiness authorities to investigate about different approaches to aircraft maintenance. At first, corrective maintenance which was developed for other industries was used by the aircraft industry but due to increasing complexity of aircrafts and their systems the industry started using time based maintenance. After years of operation and fleet experience, this industry started developing a program of its own i.e., MSG-1, MSG-2 and MSG-3. These maintenance programs have been evolved... 

This project shows the flow of implementing a 5s Program into a factory. From it’s first step by studying current situation until the last step implementing and monitoring the results. Manufacturing companies have a growing, market-driven need to adopt World Class operating technologies, including lean manufacturing 5S principles. Understanding the program's importance and knowing how to get started are the most important steps. In Iranian economic environment it is always hard to convince any top management to invest on methodologies like TPM. The reason behind this is that there are very few examples of companies with successful implementation of these methodologies. Since management... 

Railways managers have strong economic incentive to minimize the track maintenance costs, while maintaining safety standards and providing adequate service levels to train operators. . The aim of this study is providing a method for repair and maintenance management of Iranian Railways and improving previous investigations.This study consists of three parts. First, providing a new definition for the rail's status based on fuzzy theory. Second, a cumulative damage model based on a Fuzzy Markov process is applied to model the deterioration of the track. For this reason, tracks are categorized into six classes, so that those tracks with similar traffic loads and geographical location are... 

Knowing the shape and type of the breakdown of a system or the system components, for a maintenance manager or maintenance engineer is significantly important. It is also important that the existing information concerning the system performance predict and prevent a sudden failure to be probably taken place. Maintenance has gained in importance as a support function for ensuring equipment availability, quality products, on-time deliveries, and plant safety. Cost effectiveness and accuracy are two basic criteria for good maintenance. Many studies in the area of equipment maintenance, replacement, and reliability require that the failure characteristic of a component to be estimated from... 

In modern society, engineers, technical managers are responsible for planning, design, construction, exploitation of simplest to most complex systems. Crashes cause disruption of systems at different levels and can be considered as a serious threat to society and the environment, thus consumers and people expect reliable products and systems. There are different methods for increasing the reliability of systems, one of them is related to their quality and another way is related to use of standby systems. Also maintenance and repairing have major role for keeping up reliability or availability of systems. In the first part of project, optimization the reliability of system by standby... 

Combined cycle power plants consist of three main sections, namely gas turbine, Heat Recovery Steam Generator (HRSG) and steam turbine. Occurring failure in HRSG causes the steam turbine trip, so the reliability assessment of HRSG has a great importance for forecasting the probability of occurring failure and also reducing failure causes. In this project, the reliability of HRSG considering effects of aging phenomenon, maintenance and, environmental and operational conditions on reliability is modeled. Afterward a method to estimate the model parameters is introduced. Using present method, failure data of six HRSGs of a plant each with a capacity of 50 MW is analyzed and the model parameters... 

Maintenance management of power system components has been always one of the main challenges among the power system operation concerns. Experiencing the fast developments in power industries, and the power networks rapid expansions (as a consequence of power system energy consumpsion growth) while utilities have limitations on their annual investment budgets and the operational costs. Therefore, a more cost-effective maintenance plan is searched for. Various types of maintenance have been nowadays implemented in power systems, all over the world. Among them, reliability-centered maintenance and condition-based maintenance (CBM) can be addressed. Circuit breakers (CBs) from long ago are... 

Maintenance is one of the most important factors increating an efficient and stable structure intheindustry. Therefore, having an efficient and effective system in this case is very important. In this regard, the Preventive Maintenance Program is considered asone of the most important factors in the productivity and efficiency of machines and manpower.Therefore, designing this system forthemachining zone of Iran Khodro Peugeot 405 Engine Manufacturing hall # 2can have further Improvement In the Efficiency of the plant.
The project was carriedout through the following steps:
- Research and data collection
- Classifying and organizing
- Implementation
In the first step... 

For increasing longevity of a structure, it is not enough to notice only to designing aspects. In operation phase of a construction, we can increase the level of service and longevity. Asset-based Organizations, in addition to design their new assets, should maintain them. Infrastructures, such as road, bridge, dam, and water network, are important because of social and economic aspects. So they need special attention. There are efficient models for infrastructure maintenance that consider infrastructure element information, such as condition rate, weight, dimensions, deterioration rate, and cost of maintenance as inputs and give planning for maintenance in future. This planning, involves a... 

For any country, the road system is an important part of its infrastructure which can affect economic development. A good level of service for a road system requires implementation of work zone projects to maintain it which usually close one or more of the lanes available for traffic. Lane reductions could cause a disturbance to normal traffic flow and speed reductions, further resulting in a reduction of road capacity and an increase of traffic delay. In addition, work zone capacity and traffic delay are the two critical indices to determine whether the effectiveness of traffic control systems is acceptable or not. Hence, the accurate estimation of capacity and traffic delay in work zones is of... 

Reliability and availability are one of the sensitive and significant points in each maintenance system. Due to the nature of bus system failures, that almost consist of large percentage of possibility risk factors is the systems maintenance, in this study for implementing our proposed model, the bus rapid transit garage-line1 were selected. This model is to provide solutions in strategic and operational levels in the network's garage in several sessions. The solutions include decisions about the capacity of human resources in the workshop system, determine the communication policies with suppliers of spare parts and human resources training policies by the standard scoring system, the... 

Fundamental changes that has taken place in the restructured electricity industry require new methods to maintain the reliability of power system in the most possible economic way. Besides, power network maintenance processes has undeniable significance in promoting the desired level of reliability. Maintenance and repairs of electricity industry in generation units and power plants are more important than other parts of the power grid, because this part of the electric power infrastructure, compared to the other parts of the network, composes of more expensive equipments. Moreover, failures occurring in any of these parts cause a sharp decline in production leading to economic losses. Among... 

The research, Reliability Investigation for Increasing Safety in Iranian Railway Systems via TPM, aims to evaluate maintenance in Iranian Railway Systems, and its corresponding factors in impacting safety. As the title indicates, this study focuses on safety in Iranian railway systems, and thus provides a history of the rail industry, as well as its history in Iran. Additionally, four maintenance types: regular, preventative, corrective and critical are evaluated. This evaluation is done for each maintenance type based on a series of factors rated based on a questionnaire distributed amongst experts. 37 experts were surveyed consisting of rail industry employees, as well as university...