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This paper presents industry best practices to optimize lifecycle cost of electric transmission and distribution (T&D) assets whilst maintaining asset integrity, functionality and operability. This qualitative study encompasses high voltage plant and equipment in the electric power transmission and distribution sector, and focusses on asset strategy, equipment evaluation and specification. Asset...
Magnetic disk capacities have grown over the last decades by a factor of at least ten thousand. While the minicomputer disk drives of the late eighties could only store 600 MB of data [5], 8TB or 10TB disk drives are common today. The same is not true for disk transfer rates: they are just one hundred times higher than those of the late eighties. As a result, copying the entire contents of a disk...
Archival data storage systems contain data that must be preserved over long periods of time but which are often unlikely to be accessed during their lifetime. The best strategy for such systems is to keep their disks powered-off unless they have to be powered up to access their contents, to reconstruct lost data, or to perform other disk maintenance tasks. Of all such tasks, reconstructing data after...
Cloud computing brings convenience for people to use IT resources, but also brings great challenges to the maintenance service of cloud computing environement. How to ensure the quality of maintenance service for cloud computing has become a problem. This paper proposes two models for quality management. One is the service quality management model for maintenance service. The other is the service...
Today's regulatory demands are providing incentives for cost reductions to network operators in Germany and several other countries. If no corrective measures are taken by national regulation authorities (NRA), this could result in a reduction of costs at the expense of quality of supply. Thus, in 2011 the German NRA has implemented a quality regulation scheme which incentivizes network operators...
The paper brings a proposal of new methodology for application of well-known tools — RCM, RBI and SIFpro — with the aim to treat risks by means of suitable maintenance. The basis of the new methodology is the proposal of complex application of all three methods at the same time and not separately as typical today. The proposed methodology suggests having just one managing team for Reliability and...
Proteus is an open-source simulation program that can predict the risk of data loss in many disk array configurations, among which, mirrored disks, all levels of RAID arrays and various two-dimensional RAID arrays. It characterizes each array by five numbers, namely, the size n of the array, the number nf of simultaneous disk failures the array will always tolerate without data loss, and the respective...
Quality information work is one of the basic work for total quality management of equipment. Quality information is important to the equipment operation phase and its management is an important foundation for realizing the state of equipment quality and improving the equipment quality. Starting with the analysis of the function and character of quality information in equipment operation phase, this...
Lean maintenance theory is an advanced maintenance concept and method, which is formed aiming at the waste phenomena existing in most of the equipment maintenance and the lacking of maintenance theory and technique research. This paper mainly analyses several key technical characteristics related to lean maintenance: improved RCM theory, root cause analysis, improved FMEA technique, value stream analysis...
In order to accelerate equipment forming support ability as soon as possible, this paper analyses the meanings and elements of equipment support ability, and constructs the ability-forming process model of equipment support based on whole life cycle according to support ability requirements phase, support ability planning phase, support ability generation phase, support ability forming and assessment...
Nowadays, consumers expect manufacturers to provide excellent quality, reliable delivery and competitive pricing. This demands that the manufacturer's machines and processes are highly reliable. In order to possess highly reliable machines to make sure smooth manufacturing process, many organizations have implemented Total Productive Maintenance (TPM) as the enabling tool to maximize the effectiveness...
Storage class memories (SCMs) constitute an emerging class of non-volatile storage devices that promise to be significantly faster and more reliable than magnetic disks. We propose to add one of these devices to each group of two or three RAID level arrays and store on it additional parity data. We show that the new organization can tolerate all double disk failures, between 75 and 90 percent of all...
Maintenance management systems are critical to petrochemical plant operations, as well as other businesses in which uptime and reliability are critical enablers of business success. The context and consequences of electrical maintenance has changed, especially in how it relates to changing paradigms on electrical safety. This paper outlines strategies to optimize the integration of an organization's...
Disk scrubbing periodically scans the contents of a disk array to detect the presence of irrecoverable read errors and reconstitute the contents of the lost blocks using the built-in redundancy of the disk array. We address the issue of scheduling scrubbing runs in disk arrays that can tolerate two disk failures without incurring a data loss, and propose to start an urgent scrubbing run of the whole...
The effective assessment of organizational reliability, maintainability and supportability (RMS) engineering capability has an important significance to improving organizational RMS work level. For the problem of organizational RMS engineering capability assessment being complex, and many indexes being fuzzy and difficult to be defined the value and weight, a method based on fuzzy analytic hierarchy...
Software maintenance (SM) environment is highly complex, knowledge-driven and collaborative environment. Therefore, a Knowledge Management System (KMS) is critical to ensure various parties have the necessary information to perform SM activities. In an effort to model the requirements for sharing and sustaining knowledge in SM environment, we review literatures on Knowledge Management (KM), KMS and...
The results of electric shock and arc flash hazard/risk analysis are dependent on certain aspects of the electrical equipment to be maintained to assure designed and assumed performance. This includes the mechanical integrity of covers, doors and barriers, the mechanical and electrical integrity of bonding and grounding systems, as well as the functional performance of circuit protective devices and...
The aim of this paper is to study the state of overall equipment effectiveness (OEE) through total productive maintenance (TPM) practices across the Malaysian industries. A theoretical framework is developed to determine the predominant TPM pillars that influence the OEE. Based on this theoretical framework, a survey-based research on a sample size of 70 Malaysian industries is applied to this study...
We propose to increase the reliability of RAID level 5 arrays used for storing archival data. First, we identify groups of two or three identical RAID arrays. Second, we add to each group a shared parity disk containing the diagonal parities of their arrays. We show that the new organization can tolerate all double disk failures and between 75 and 89 percent of triple disk failures without incurring...
Two-dimensional RAID arrays maintain separate row and column parities for all their disks. Depending on their organization, they can tolerate between two and three concurrent disk failures without losing any data. We propose to enhance the robustness of these arrays by replacing a small fraction of these drives with storage class memory devices, and demonstrate how such a pairing is several times...
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