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Int J Syst Assur Eng Manag DOI 10.1007/s13198-012-0092-y ORIGINAL ARTICLE Advanced model for maintenance management in a continuous improvement cycle: integration into the business strategy Luis Barberá • Adolfo Crespo • Pablo Viveros Raúl Stegmaier • Received: 19 January 2011 / Revised: 3 February 2012 The Society for Reliability Engineering, Quality and Operations Management (SREQOM), India and The Division of Operation and Maintenance, Lulea University of Technology, Sweden 2012 Abstract This paper presents an advanced model for the integrated management for industrial plant maintenance and equivalent. The proposed model achieves to align the local maintenance objectives with the overall business objectives. Additionally, the model provides a real operational context and takes consideration of certain restrictions that may affect the efficiency and/or the effectiveness of the industrial maintenance management. First, the importance of a proper maintenance management and its consequences are discussed. Then, the model will describe in seven stages how to manage and optimize in a continuous way all the processes that deal with planning, programming and maintenance execution. This starts from a management process in the design stage or, from an already established management process. Moreover, the model includes fundamental aspects that fully integrate the directives of the business with maintenance activities. This article ends with conclusions and all references used during the research process prior to the drafting of this document. L. Barberá (&) A. Crespo Department of Industrial Management, School of Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain e-mail: [email protected] A. Crespo e-mail: [email protected] P. Viveros R. Stegmaier Department of Industrial Engineering, Universidad Técnica Federico Santa Marı́a, Avenida España, 1680 Valparaiso, Chile e-mail: [email protected] R. Stegmaier e-mail: [email protected] Keywords Maintenance management Maintenance processes Maintenance model Methodologies of maintenance 1 Introduction Since the 1970s, companies understand that they need to integrate the maintenance area within the organization and facilitate their interaction with the management of other functional areas (Pintelon and Gelders 1992). The implementation of a useful model for the overall management of maintenance has become a subject of research and a fundamental issue. This is to achieve efficient and effective maintenance management, aimed at meeting the business objectives (Prasad et al. 2006). Today, the possibilities for successful companies are focused on the competitive level that they can achieve. From this perspective, it is particularly important to identify what factors directly or indirectly affect competitiveness. Due to its direct impact on the competitiveness of companies, there is no doubt that the maintenance engineering has become more important. In fact, companies recognize that maintenance can provide value to their business (Van Horenbeek et al. 2011). The modern maintenance management includes all activities to determine maintenance priorities and objectives, strategies and responsibilities (EN 13306 2001). This facilitates the planning, programming and control of the maintenance execution, and always looks for continuous improvement whilst taking into account relevant aspects of the organization (i.e. economic and security aspects). A good maintenance management, taking into account the life cycle of each physical asset, must meet the goals of 123 Int J Syst Assur Eng Manag reducing overall costs of productive activity (efficiency). This is to ensure the correct performance of equipment and its functions (effectiveness); reduce the level of risk to people and the negative effects on the environment (effectiveness), and moreover, generate processes and activities that support these objectives. Therefore, maintenance management becomes a powerful competitive factor of which the importance in the business is growing every day. 2 Maintenance engineering: management models The basic concept leading to the maintenance engineering is the continuous improvement of the maintenance management process by incorporating knowledge, intelligence and analysis. They support the decision-making in the field of maintenance and are designed to enhance the global output of economic and operational result. Due to the analysis and modeling of the results obtained in the execution of maintenance operations, the maintenance engineering permits the renovation of a continuous and justified strategy. Therefore, programming and planning activities ensure production at the lowest overall cost. Moreover, it allows the correct selection of new equipment with minimum overall costs in terms of their life cycle and operational security (cost of inefficiency or lost opportunity cost of production). The objectives of any model of maintenance management should be determined based on the business plan of the organization. Maintenance strategies should always be aligned with the company’s business plans, because the achievement of maintenance objectives depends upon it, as well as the business plan of the organization. Therefore, the maintenance and business objectives should be strongly linked together. Some of the main optimization criteria and objectives are (Van Horenbeek et al. 2011): maintenance costs (discounted), availability, maintenance quality, reliability, personnel management maintainability, inventory of spare parts, environmental impact, overall equipment effectiveness, safety/risk, number of maintenance interventions, logistics, capital replacement decisions, output quantity, life-cycle optimization and output quality. Maintenance management is not an isolated process (Pintelon and Gelders 1992); it is actually a linear system that depends on factors related to maintenance management, as well as internal and external factors of the organization. Moreover, the most desirable situation is the complete integration of maintenance management in the system (Vanneste and Van Wassenhove 1995). Figure 1 shows the current context which frames the maintenance management and their interactions in response to two typologies: internal and external. Based on ISO 9001–2008, we can establish a sequential diagram of the maintenance system from the point of view of the processes that constitutes it (Fig. 2). In this way, it is possible to distinguish all the aspects that should be taken into consideration when developing and implementing a maintenance management model. A maintenance management model should be effective, efficient and opportunistic, i.e. it must be aligned with set objectives that are based on business needs (Van Horenbeek et al. 2011), and minimize indirect maintenance costs (Vagliasindi 1989) (associated with production losses). Fig. 1 Maintenance system OUTSIDE Reliability and maintainability existing Information Maintenance Management Information Information and Decisions Suppliers of the elements OTHER AREAS OF THE ORGANIZATION MAINTENANCE SYSTEM Human Resources Personal structure Requirements: • Functionality • Security • Availability • Operation cost • Productivity • Environmental Aspects • Internal Relations DECISIONS Spare parts and materials Resources and infrastructure Support equipment (tools). internal and external resources Administrative and office resources Computers (hardware and software) Information 123 Physical actions EQUIPMENT TO BE MAINTAINED MAINTENANCE RESOURCES Int J Syst Assur Eng Manag Fig. 2 Processes of maintenance system MAINTENANCE CUSTOMER Management Responsibility Strategic management maintenance Continuous improvement Resource Management Measurement, analysis and improvement Satisfaction INPUT Requirements Resourcess - Human Resources - Spare parts, materials - Infrastructure - Information Fig. 3 Resources in the maintenance system Maintenance Implementation MAINTENANCE MANAGEMENT SEQUENCE Human resources management Spare Parts and Materials Management Maintenance Performed OUTPUT MEASUREMENT, ANALYSIS AND IMPROVEMENT Infrastructure Management Maintenance Information Management RESOURCES MANAGEMENT PROCESS MANAGEMENT At the same time, it must be able to operate, produce and achieve the objectives with the minimum cost (to minimize direct maintenance costs), and generate activities to improve key indicators of the maintenance process, related to maintainability and reliability. Therefore, to develop a robust and effective maintenance management model, it is important to consider all aspects related to managing the resources available and needed (Crespo 2007) (Fig. 3). The management of these resources can be classified based on four important groups (López Campos et al. 2010a, b): human resources, spare parts, information, and infrastructure. For correct management of human resources different aspects should be enhanced and correctly evaluated, such as staff motivation, which will largely determine the level of involvement, their preparation and training on specific tasks and operations performed; performance evaluation both individually and collectively as a group, the correct and easy communication between all parties involved and the collective acceptance of organizational leadership. The spare parts and materials management includes all aspects related to storage and availability (time), i.e. inventories and suppliers (supply). Similarly, the infrastructure management deals with both internal and external assets and are necessary to enable correct execution of maintenance, for example, equipment of support, verification, administration (office) and computer (hardware and software). Finally, the correct management of maintenance information directly affects the achievement of the set objectives since it is the base of the information to develop planning and scheduling of maintenance. This information is compiled using data obtained from the maintenance process itself (information equipment (individual operation and maintenance) and maintenance operation) and other relevant information or data. 3 Organizational structure: management levels The main strategic objectives of most businesses are to increase market share and profitability (Porter 1985); however, the way to achieve this is not unique. This is why the corporate goals are broken down into objectives and strategies for different processes, such as operations and maintenance. In maintenance, this should support the 123 Int J Syst Assur Eng Manag achievement of corporate objectives by defining an appropriate set of policies and resources. The definition of objectives at different levels of control represents the purpose of maintenance management. Moreover, the pillars of these objectives are efficiency, effectiveness and profitability, as well as knowing that the overall objective is to contribute to the profitability and competitiveness of the company (Parida and Chattopadhyay 2007; Kans 2008). Efficiency, in simple terms, explains the relationship between resources and inputs (input) and the results, while the effectiveness shows how well the results contribute to business goals (Anthony 1998). Moreover, the profitability indicator is a measure of a system/process in terms of performance during its life cycle (Blanchard 1998). Maintenance goals (SIS 2001) can be defined as assigned and accepted goals that require maintenance activities. Each one belongs to one of the different levels of control, from the strategic level of maintenance to the operational level of maintenance. Overall, the strategies address and define the organizational plan to achieve the objectives (Anthony 1998), focusing on the ‘‘how’’ they will be achieved. The direction of the maintenance unit should be consistent with production goals and overall strategic goals of the company and, likewise, should be consistent in the definition of strategies, policies, procedures, organizational structure and decisions at different levels (planning and structuring the maintenance work) (Kans 2008). Emphasizing the level of availability can be defined from a level of service or expected production (target/goal) that is committed by senior management of the company and in line with the actual budget. Thus, the availability level required is defined in terms of the (fixed) strategy set. Consequently, the reading of this display becomes an input for the next hierarchical level (tactical), where core competencies are aimed at the efficient allocation of available resources (money, time, staff, etc.) to plan maintenance activities. As a result, the operational level, fed with the tactical decisions, seeks the efficient use of resources and considers the technical and organizational aspects (Kans 2008). Figure 4, shows the hierarchy of objectives and goals set for each level, and also indicates other fundamental aspects in the decision making process. The flow of decision making for the achievement of strategic, tactical and operational goals and objectives follow the top-down format, i.e. starting from the top level (corporate strategy) and continuing down to the operating level and execution (SIS 2001; Anthony 1998). However, the flow of information that feeds decision-making starts from the base, giving empirical support to the decisions. The efficient and economically correct use of the assets during its life cycle allows an optimum definition of the 123 Fig. 4 Hierarchy levels of goals level of asset availability and/or processes, which have as a goal a level of production, or financial economic indicator, the ROA (De Andres et al. 2009). 4 Life cycle cost analysis—LCCA 4.1 Basic aspect of the life cycle cost analysis—LCCA During recent years, the investigation area related to the life cycle cost analysis has continued its development as much on the academic level as on the industrial level. It is important to mention the existence of other methodologies that have emerged in the area of LCCA, such as: life cycle cost analysis and environmental impact, total cost analysis of production assets, among others (Moubray 1997). These methodologies have their particular characteristics, although regarding the estimation process of the costs for failure events impact; they usually propose reliability analysis based on constant failures rates. The early implementation of the cost analysis techniques allows for early evaluation in advance of potential design problems, and to quantify the potential impact in the costs along the life cycle of the industrial assets (Moubray 1997). For this, procedures exists that group together in the denominated: techniques of life cycle cost analysis. LCCA is defined (Kirk and Dellisola 1996) as an economic calculation technique which supports the optimal making decisions linked to design process, selection, development and substitution of the assets in a production system. It, ideally, evaluates the costs, in a quantitative way, associated to the economical period of expected useful life and is expressed in yearly equivalent monetary units (dollars/year, euros/year, pesos/year). Int J Syst Assur Eng Manag The cost of a life cycle is determined by identifying the applicable functions in each one of its phases by calculating the cost of these functions and applying the appropriate costs during the whole extension of the life cycle. For it to be complete, the cost of the life cycle should include all the costs of design, fabrication and production (Ahmed 1995). From the financial point of view, the costs generated along the life cycle of the asset are classified in two types of costs: • • CAPEX Capital costs (design, development, acquisition, installation, staff training, manuals, documentation, tools and facilities for maintenance, replacement parts for assurance, withdrawal). OPEX Operational costs: (manpower, operations, planned maintenance, storage, recruiting and corrective maintenance—penalizations for failure events/low Reliability). 4.2 Impact of the reliability in the LCCA Woodhouse (1991) outlines that to be able to design an efficient and competitive productive system in the modern industrial environment, it is necessary to evaluate and to quantify, in a detailed, way the following two aspects: • Costs an aspect that is related with all the costs associated to the expected total life cycle of the production system. Including: design costs, production, logistics, development, construction, operation, preventative/corrective maintenance, withdrawal. Fig. 5 Economic impact of the reliability Table 1 Description of costs of non reliability • Reliability a factor that allows to predict the form in which the production processes can lose their operational continuity, due to events of accidental failures, and to evaluate the impact on the costs that the failures cause in security, environment, operations and production. The key aspect of the term ‘‘reliability’’ is related to the operational continuity. In other words, it is possible to establish that a production system is ‘‘Reliable’’ when it is able to accomplish its function in a secure and efficient way along its life cycle. When the production process begins to be affected by a great quantity of accidental failure events (low reliability), this scenario causes high costs, associated mainly with the recovery of the function (direct costs) and with growing impact in the production process (penalization costs). See Fig. 5: The totals costs of non reliability are described next in Table 1: Consequently, in view of the previous information about the basic aspect and impact of the reliability in the LCCA, the concept of global cost can be formulated as the sum of all costs generated during the life cycle of a project, considering the NPV techniques (net present value of each cost). this model could insure the business decisions and actions. The global cost can be computed using the following relationship: Global Cost ¼ Fixed Capital Cost ðPÞ þ Cost of non Reliability ðP Þ þ Operational Cost ðPÞ where (P) represents: present value for each cost. The cost of fixed capital (or investment) is determined by the cost of equipment and facilities associated with the project. The operational cost is defined by the quantification of all those elements of the operation of a system, such as supplies, energy, spare parts, manpower, operations, planned maintenance, etc. Finally, the cost of non reliability is given by the sum of cost for penalization, which is associated with the unavailability of the facility during the evaluation period, and the cost of corrective maintenance. Therefore, the items of global cost can be represented as Cost for Penalization, due to downtimes. Opportunity looses/deferred production Production looses (unavailability) Operational looses Impact in the quality Impact in security and environment Cost for corrective maintenance Manpower (own or hired) associated to solve non planned event Material and replacement parts direct costs related with the consumable parts and the replacements used in the event of an unplanned action 123 Int J Syst Assur Eng Manag follows (Woodhouse 1993; Ruff and Paasch 1993; Barlow et al. 1993): " # n X 1 FCðPÞ : I0 þ IT ð1Þ ð1 þ iÞT T¼1 " n X CPT HT ð1 ASystem;T Þ þ CCMT CNRðPÞ : T¼1 OCðPÞ : n X T¼1 ð2Þ ð1 þ iÞT OCT MISSION AND STRATEGIC OBJECTIVES # 1 " 1 ð1 þ i ÞT FINANCIAL REQUIREMENTS # INTERNAL PROCESSES ð3Þ where FC (P), fixed capital in present value; CNR (P), cost of non reliability in present value; OC (P), operational cost in present value; OCT (P), operational cost in present value at time period T; IT, the investment flow at time period T; I0, the investment flow at time period 0; CPT, cost for penalization per time unit at time period T ($/h; US/day, etc.); CCMT, cost for corrective maintenance at time period T (US, $, etc.); ASystem,T, availability of the system at time period T; HT, period of evaluation within the project horizon (e.g. 8760 h); n, number of years or periods in the planning horizon; and i, capital cost rate of the company at time period T LCCA provides the tools to engineer maintenance budgets, project costs, and present decision making scenarios in a financial perspective to achieve the lowest long term cost. Therefore, different alternatives of equipments, systems or projects could be analyzed in a way where the most recommended technical alternative will be the one with the minimum global cost. Fig. 6 Perspectives BSC but completes and help its communication and implementation (Abran and Blugione 2003). This methodology transforms the vision and strategy into a set of objectives and performance indicators grouped into four core perspectives (dimensions) that are deemed critical to the management and control (Fleisher and Mahaffy 1997) (Fig. 6): 1. 2. 3. 5 Aligning strategy with the overall objectives: BSC The balanced scorecard (BSC) is a methodology with a multidimensional approach that can integrate the corporate strategy of the organization with its own operation. This is to determine the achievement of organizational objectives by evaluating business performance through management indicators (Kaplan and Norton 1996). Thus, the BSC helps to implement the strategy lines dictated by the interests of the company (Kaplan and Norton 2005) and moreover, aligns the objectives of the departments, or the operating units, with the overall strategic objectives that control their deviations. The BSC can be understood as a system of communication, information and training (on the strategy and the company itself), which does not replace the traditional process of strategic planning (Kaplan and Norton 2006), 123 LEARNING AND IMPROVING CUSTOMER REQUIREMENTS 4. Learning and growth perspective: the aim is to ensure resilience and long-term renewal of the company (in response to changes generated by the environment) as well as maintaining knowledge in the areas considered core competencies. Internal process perspective: considers the quality, productivity, and costs of various mission processes developed by the organization, including the maintenance management process (number of defective units, production cycle time, idle capacity of equipment, etc.). Customer perspective: evaluate how to create value for customers. Seeks to measure the impact and satisfaction level that the organization generates for its customers. Financial perspective: seeks to measure the survival, growth and development of the organization in financial terms and value generation. The BSC retains the technical and financial measurement (Fleisher and Mahaffy 1997), but also performs a set of broader integrated measurements that links internal processes, employees and the performance of systems with the success of the company in the long-term. In this way (Michalska 2005), the BSC complements financial indicators while clarifying, translating and transforming the vision and strategy in order to identify, plan and establish strategic initiatives. For their part, the indicators should be defined to measure a clear objective to which they are associated, allowing strategic monitoring of them and assessing their Int J Syst Assur Eng Manag achievement by an officer assigned for that purpose. Therefore, each initiative, indicator and target will have a responsible individual in charge who will monitor the level of accomplishment. Subsequently, strategic actions or initiatives are defined by allowing the achievement of the objectives and goals. The establishment of actions are required to consider the implementation effort and the benefits derived from them. Finally an adequate monitoring system must be established to assess the level of achievement of strategic objectives on a regular basis (Michalska 2005), and in this way, be able to make decisions and opportune corrections in the strategy defined from them. The indicators taken into account in the BSC methodology should be relevant, practical, measurable and implementable (Kaplan and Norton 1992). There are two types of indicators in the BSC framework (Macdonald 1998): results indicators (lag measures) and performance indicators (lead measures). The BSC should be a balance between both types of indicators, since both are necessary. Lag indicators reflect results of past decisions and give information about what happened, but are unable to change the outcome. On the contrary, Lead indicators generally measure the performance of processes to detect what is happening and take appropriate action to improve the outcome. Therefore, this makes it more predictive and enables faster settings. Once the indicators are defined, it is necessary to integrate with other pre-existing information systems in the organization (Kaplan and Norton 1996). In addition, the sources of each of the data needed to feed the indicators at appropriate intervals should be identified. 6 Proposal of a new maintenance management model Currently, there is a big gap between academic models and application in practice (Van Horenbeek et al. 2011), for this reason, it is very difficult for industrial companies to adapt these models to their specific business context. This article presents an advanced model for the integral maintenance management in a cycle of continuous improvement, which is aligned with the strategies, policies and key business indicators. For the development and elaboration of the presented model, numerous proposals have been considered and arranged chronologically in time. These are as follows: Pintelon and Van Wassenhove (1990), Riis et al. (1997), Wireman (1998), Duffuaa et al. (2000), Hassanain et al. (2001), Campbell and Jardine (2001), Tsang (2002), Waeyenbergh and Pintelon (2002), Murthy et al. (2002), Cholasuke et al. (2004), Abudayyeh et al. (2005), Pramod et al. (2006), Prasad et al. (2006), Kelly (2006), Tam et al. (2007), Söderholm et al. (2007), Crespo (2007) and López Campos et al. (2010a, b). The model also integrates many of the models used in practice in companies with a long tradition and excellence in this field (Pintelon and Gelders 1992; Vanneste and Van Wassenhove 1995). In the following table (Table 2), the main innovations, new elements and trends of maintenance management models through the years are summarized. The proposed model arises from the need to consider the management of maintenance and the existing strategic and operational context. This is achieved by following a series of real aspects (not covered in other models) needed to convert a theoretical model in a real and useful maintenance management model. Thus, the model takes into account the real or genuine constraints that could limit the design of preventive maintenance plans and the resources to do so. It also considers the selection of critical spare parts (inventory cost vs. cost due to unavailability of critical equipment) and the positive involvement of e-technologies (e-maintenance) in modern maintenance management on a global level. In turn, the model consists of seven arranged stages that follow a logical sequence of action hierarchy and align local maintenance objectives with the global business objectives (Fig. 7); all this in a framework of continuous improvement using the principles of the BSC methodology applied to maintenance management (Fig. 8). Furthermore, two possible existing scenarios were taken into consideration for the design of this model: design stage (life cycle cost analysis LCC), or existing process, and a functioning one (ranking of critical equipment), which requires an evaluation for its optimization. Additionally, the model describes how to manage and optimize in a continuous way all processes that deal with planning, programming and implementation of maintenance. All of this in a real operational context, which takes into account certain restrictions, may affect the efficiency and/or efficacy of industrial maintenance management. The model is designed in a simple and practical way that considers the alignment of key processes of maintenance management and external processes that support the success of the whole process. It also facilitates to those responsible for the overall management of maintenance in an organization. Each stage of the model corresponds to an action that precedes the next one; the order and direction of these actions proposed in the model are unique (with two starting points depending on the initial or starting position) and not reversible. Each stage distinguishes and characterizes concrete actions to follow the different steps of the maintenance management process. The model is dynamic, sequential and closed-loop and can precisely determine the course of actions to be carried out in the management process, ensuring efficiency, effectiveness and continuous improvement of its own. 123 Int J Syst Assur Eng Manag Table 2 Innovations of maintenance management models in chronological order (adapted from (López Campos and Márquez 2009) Year Innovations Author(s) 1990 Propose a complete system of maintenance indicators Pintelon and Van Wassenhove (1990) 1992 Expose the necessity of linking between maintenance and the other organizational functions Pintelon and Gelders (1992) Highlight the importance of using quantitative techniques for maintenance management 1995 Propose an analysis focused on effectiveness and efficiency of maintenance. Emphasize the importance of the managerial leadership in maintenance management Vanneste and Wassenhove (1995) and Campbell and Jardine (2001) 1997 Propose an integrated modelling approach based on the concepts of situational management theory Riis et al. ( 1997) 2000 Propose the use of a great variety of Japanese concepts and tools for the statistical control of maintenance processes in a module called ‘‘feedback control’’ Duffuaa et al. (2000) 2001 Orientate the model to the computer use, using a standard for information exchange Hassanain et al. (2001) 2002 The use of e-maintenance. Proposes a guide to analyze the outsourcing convenience as an entry element to the maintenance framework Tsang et al. (1999) Incorporate both the tacit knowledge and the explicit one and integrates them in a computer database. Give special value to the knowledge management 2006 Suggest the union of tools: QFD (Quality Function Deployment) and TPM into a model Pramod et al. (2006) 2007 Propose a process view in which maintenance contributes to the fulfilment of ‘‘external stakeholders’’ requirements Söderholm et al. (2007) Proposes a model oriented to the improvement of the operational reliability besides the life cycle cost of the industrial assets Crespo (2007) This article shows part of the process of designing and modeling a new maintenance management model completely aligned to the quality management standard ISO 9001:2008 and expressed using the unified modeling language (UML) López Campos and Márquez (2009) and López Campos et al. (2010b) 2010 STRATEGIC OBJECTIVES BSC ACTIONS NOT ALIGNED Fig. 7 Strategic alignment with the BSC implementation 7 Description of the model stages Now the model stages will be presented, assuming that the organization already manages, to a lesser or greater extent, maintenance. 7.1 Stage 1 Analysis of the current situation: definition of objectives, strategies and maintenance responsibilities First, and as a precursor to any activity, it is necessary to conduct a baseline assessment or an existing one, in relation to maintenance management. This analysis must be completed in the case that the organization or plant already 123 has a more or less defined management, especially if there were any methodology or procedures for this work. This assessment of the current situation must consider all aspects related to the maintenance of equipment where information is available, for example, issues such as planning, scheduling and execution of maintenance duties, failure history, mean time to failures (MTTF) indicators and mean time to repair/recover (MTTR), financial resources allocated to maintenance, economic impact, or in production (equipment failure) by unscheduled stop of the plant (system) or subsystem, among others (González et al. 2010). To achieve an accurate performance in the global management of maintenance in an organization, it is essential to define, in advance, the objectives (goals) to be achieved. This is accomplished by establishing a strategy aimed at these objectives and determining the responsibilities of staff involved at operational and managerial level. The definition process of a maintenance strategy requires (Fig. 9): • To determine the maintenance objectives, based on corporate business objectives, for example realistic estimated values for the following performance indicators: availability of equipment, reliability, security, risk, etc. Determine the performance or actual results of the production facilities, comparing them with their respective nominal capacity (ratings). Int J Syst Assur Eng Manag Fig. 8 Proposed model of maintenance management. ‘‘House of Maintenance’’ Fig. 9 Model for the definition of the maintenance strategy (Crespo 2007) • Identify key indicators for the performance evaluation of the facilities (key performance indicators—KPIs). Maintenance management should align all maintenance activities with a defined strategy on a management, tactical and operational level. Once the business priorities change to maintenance priorities, the preparation of the strategy, according to the objectives, will proceed. In this way we get a generic maintenance plan in the company that will develop and focus on those assets considered critical. Tactical level actions will determine the proper allocation of resources (skills, materials, testing and measuring equipment, etc.) to achieve the maintenance plan. The end result is the creation of a detailed program with all the tasks to be undertaken and resources allocated for their realization. In addition, during the process of planning and scheduling maintenance needs, skills must be developed to discriminate different options (cost) of available resources (which can be assigned to perform a certain task in a specific piece of equipment (asset)), the ideal implementation place for the task, and the start and execution time. This will largely determine maintenance policies at the tactical level. The actions on an operational level should ensure that maintenance tasks are performed correctly by selected technicians by following the outlined procedures on a schedule time and using the correct tools. 7.2 Stage 2 Ranking of the equipments Once the objectives have been defined, and the responsibilities and a maintenance strategy has been designed, it is 123 Int J Syst Assur Eng Manag of vital importance to discretize the physical assets of the organization based on their criticality, i.e. greater or lesser impact in the global production system and/or safety of the system (business objectives). There are many qualitative and quantitative techniques that offer a systematic basis for classifying an asset as critical (C)/semi-critical (SC)/non-critical (NC), based on probabilistic risk assessment and obtaining the number/ probability index asset risk (PRA/PRN) (Moubray 1997). Assets with the highest index will be analyzed first. In many cases there is no historical data on the basis of which to obtain these rates. In these cases it is possible to use more qualitative techniques in order to ensure adequate initial levels of effectiveness in maintenance operations. Risk is defined as the product of the frequency for the consequence of failure. Frequency is the number of failures in a given time. The weighing of various factors, or criteria, is of importance depending on the needs of the organization that is used to quantify the consequence of failure. The important criteria depend on each organization where safety, environment, production, costs (operations and maintenance), frequency of failures and average repair time are most commonly used. Once the assets are ranked, based on their criticality, the criticality matrix is obtained (Fig. 10) (Crespo 2007). 7.3 Stage 3 Analysis of weaknesses in high-impact equipments After completing the hierarchy of the physical assets of the plant, as a function of its criticality (critical equipment, semi-critical and noncritical), the next step should be to conduct a visual-technical inspection that breaks down all equipment classified as critical in the plant. Semi-critical equipment will be inspected briefly, with a lower level of detail, while the non-critical assets will not need any inspection resources because their impact on the system, in case of a failure, is not significant. Therefore the noncritical equipment will be allowed to operate until failure occurs. Preliminary inspection of the C and SC equipment allows us to know the current status of equipment operation, deficiencies in performance, operating environment and all other relevant information which determines the specific maintenance needs. At this stage, as in previous ones, it is very important to consider the information provided by each of the operators assigned to control and use C and SC equipment. In the critical equipment, prior to the development of actions that constitute the maintenance plans, it is recommendable to analyze the potential repetitive and chronic failures (from the equipment’s historical data) of which frequency of occurrence may be considered excessive. Identifying the reasons that cause these chronic failures will allow, in the best case, the elimination of the failure mode, or if not possible, for example, when the cost of removal far exceeds the cost of failure of the equipment, the mode of failure can be controlled. The elimination or control of the failure modes contribute to achieve a high return on initial investment in the maintenance management program. This also facilitates the subsequent stages of analysis and design of maintenance plans, which require significant investment of time and resources. There are different methods for analysis of weaknesses in critical assets; one of the most common is the root cause analysis (RCA). It is a methodology that systematically identifies the primary root causes of failures and applies further corrections (solutions) to eliminate them permanently. The causes why failures happen can be classified into physical, human or latent causes. The physical cause is the technical explanation of why the asset fails. The human causes include human error (action or omission) that give rise to physical causes of failure. Finally, the latent cause includes all the organizational and managerial deficiencies that result in human errors, and failures become chronic in systems and procedures not corrected over time. The latent causes of failure are usually the biggest concern at this stage of the process of maintenance management. The RCA has multiple applications, for example: • • • • Fig. 10 Generic representation of the criticality matrix 123 Proactively avoiding recurrent failures of high-impact operational and maintenance costs. Reactively solving complex problems that affect an organization. Analysing repetitive failures of equipment or critical processes. Analysing human errors when designing and implementing procedures. Int J Syst Assur Eng Manag • Some benefits expected from the use of RCA are: • • • • Reduction of the number of incidents, failures and waste. Reduction of expenses and deferred production, associated with failure. Improvement of reliability, safety and environmental protection. Improvement of efficiency, profitability and productivity. RCA consists of five phases (Fig. 11) (DOE 1992). As shown, the solution of the problem is defined directly from the definition of the problem itself, without developing a thorough analysis of its root causes. For RCA, various tools and techniques can be used to detect the root cause of a problem. The most common techniques are: • • • • • Logic tree (PROACT) (Latino and Latino 2002) Fault tree analysis (FTA) (Mobley 1999; Yang 2007a, b) Cause and effect diagram (DOE 1992) The five whys technique. (Cornell 2010) Ishikawa diagram (Mobley 1999) There are many other tools that can be used for RCA. The efficacy of their application depends on the level of information available and of the detail being analyzed. 7.4 Stage 4 Design of maintenance and resources plans required The design of preventive maintenance plans can be divided into two main parts: • Information: This collects data from computers to be analyzed. It identifies the different functions of equipment analyzed in its operational context. Subsequently, each function is determined for any failures. Next, failure modes are identified, this is, the event that precedes the decision. Finally, and only if necessary, the root causes of failures would be analyzed if required (RCA, stage 3). With all this data, it assesses the consequences of each failure in each of the areas (operational, safety, environment and cost). The decision: This sets out prevention duties (technically feasible and economically profitable) for the consequences of failure modes. For each failure mode or root cause, the following need to be determined: the maintenance task to perform; the frequency with which it will be done; the responsibility of running it and the new risks resulting from application of the maintenance plan. One of the strategies used in the industry for designing strategies and maintenance plans is referred to as RCM (reliability centered maintenance). This method is widely used and is convenient for determining the maintenance needs of any physical asset in its operating environment (Moubray 1997). It has also been defined (Rausand 1998) as a method of identifying the functions of a system and how these functions may fail by, setting in a preliminary way, preventive maintenance tasks which need to be applicable and effective. As a general rule, RCM philosophy, gives priority maintenance to the critical components for the correct functioning of a plant (Lehtonen, 2006) and leaves noncritical components to operate to its failure. In this instance, the appropriate corrective maintenance is applied. Fig. 11 RCA methodology GATHERING OF INFORMATIÓN IDENTIFY THE PROBLEM PHASE 3 PHASE 1 DETERMINE SIGNIFICANCE OF THE PROBLEM IDENTIFY CAUSES IDENTIFY ROOT CAUSE IDENTIFY EFFECTIVE SOLUTIONS PHASE 2 IMPLEMENT SOLUTIONS PHASE 4 INFORM PHASE 5 MONITOR 123 Int J Syst Assur Eng Manag The RCM takes into account the operational context of critical equipment and raises the need for a monitoring program and an update, (Barberá et al. 2011) (effective RCM analysis). It is essential to correctly identify the components considered as critical (Bloom 2006). To determine the criticality of the failure of a physical asset, two aspects must be considered: their probability of occurrence and severity. The probability of occurrence measures the estimated frequency of occurrence of the failure, while the severity measures the seriousness of the impact that this failure may cause over the installation. This evaluation is completed by the well-known technique called ‘‘failure modes and effects analysis’’ (FMEA). The RCM methodology proposes the identification of failure modes that precede potential failures of equipment, and the execution of a systematic and uniform process. This is for the selection of maintenance tasks that are considered useful and applicable (Moubray 1997). The result is the recommended groups of maintenance activities for each asset. This will define the actual content of the specific activities to be undertaken and their frequency of execution. Specifically, the RCM analysis methodology proposes a procedure (Moubray 1997; SAE JA1011 1999) that, through the formulation of seven questions, helps to identify the real needs of maintenance of assets in its operating context (Table 3): The application of the RCM process is regulated through SAE-JA1011 (1999) and SAE-JA1012 (2002) norms. Once the maintenance activities that are considered more efficient for each critical piece of equipment are selected, the final recommendations of the RCM analysis will be set out and its implementation will take place. From these final recommendations, the drafting of the plan or strategy proposal for the installation maintenance must be created by allocating the necessary resources. The implementation of a preventive maintenance program will help to (Campbell and Jardine 2001; Bloom 2006) anticipate failures and repair them with minimal impact on system performance, eliminating the causes of some failures and identifying those faults that do not compromise system security. The necessity of considering new Table 3 RCM methodology 123 maintenance techniques, adding a possible failure mode or component initially analyzed, or revising the strategy, among other things, will make it convenient to periodically update the global RCM analysis to minimize the obsolescence of the recommendations made over the time. The preventive maintenance plan generated must specify all resources needed to implement it: technical data, regulations, special facilities required, spare parts, supplies, tools, monitoring equipment for the conditions, auxiliary (back-up) equipment, test equipment, personnel, etc. At the same time, the design of preventive maintenance plan for a given system must take into account possible restrictions in the operating environment in order to design real and executable plans. Some of the restrictions that should be considered are: • • • • • Allocated budget. Programming (time available). Enforceable rules and regulations for accomplishment Operational environmental conditions. Working modes. 7.5 Stage 5 Maintenance scheduling and optimization in the allocation of resources At this stage a detailed schedule of all maintenance activities should be made, and the needs of production in the time scale and the opportunity cost to the business during the execution of tasks should be taken into consideration. The scheduling of maintenance activities aimed at optimizing the allocation of human and material resources, should minimize the impact on production. The maintenance schedule should be short (\1 year), medium (1–5 years) and long term ([5 years). 7.6 Stage 6 Control and evaluation of the maintenance implementation The execution of maintenance activities (once designed, planned and scheduled as described in previous sections) should be evaluated, and deviations continuously 1 What are the functions that must meet the asset and what is the expected performance in its current defined operating context? 2 3 How can the equipment completely or partially fail? What is the root cause of functional failure? 4 What happens when a failure occurs? 5 What is the consequence of each failure? 6 What can be done to prevent or predict the occurrence of each functional failure? 7 What can be done, if possible, to prevent or predict the occurrence of functional failure? Int J Syst Assur Eng Manag monitored to pursue business objectives and values set for the selected maintenance KPIs of the organization. The control of the execution allows feedback to be given and optimizes the design of the maintenance plans, thereby improving its effectiveness and efficiency. The information system design is oriented to collect and process exact information necessary to satisfy the information needs that lead to achieving the basic objectives of maintenance management. These are increased efficiency and reduced costs. The data that will be later analyzed must be as reliable as possible, i.e. the sheet design or maintenance job order must be found simple and standard for operators and managers as this will be the only useful and reliable data available. This design problem is fundamental to the functioning of the system. The same happens with the rest of the documents that capture data which makes up the system. 7.7 Stage 7 Life cycle analysis and the possible renewal of equipment The large number of variables that must be managed in estimating the real cost of an asset over its useful life creates a scenario of high uncertainty (Durairaj and Ong 2002). Often, the total cost of the production system is not visible, in particular those costs associated with the operation, maintenance, installation testing, staff training, among others. The life cycle cost is determined by identifying the applicable functions in each of its phases (design, manufacturing and production), thus, calculating the cost of these functions and applying the appropriate cost for the duration of the life cycle (Ahmed 1995). Through an analysis of the life cycle cost it is possible to determine the cost of an asset over its useful life. The analysis of a typical asset could include costs of planning, research and development, production, operation, maintenance and removal of equipment (Yang 2007a, b). The acquisition costs of equipment (including research, design, testing, production and construction) are usually obvious, but the analysis of the life cycle costs depends crucially on values derived from reliability, for example, the analysis of failure rate, the cost of spare parts, the repair times, the costs of components, etc. An analysis of the life cycle costs is necessary for optimal acquisition of new equipment (replacement or a new acquisition) (Campbell and Jardine 2001), since it shows all the costs associated with an asset (beside the purchase price), and allows management to develop accurate predictions. 8 Model considerations The proposed model includes, besides the actual restrictions, the application of new ICT technologies at all stages within a cycle of continuous improvement. With the application of new maintenance technologies, the concept of ‘‘e-maintenance’’ emerges as a component of the term ‘‘e-manufacturing’’ (Tsang et al. 1999). This promotes the benefits of new technologies of information and communication to create corporate environments and distributed multi-user. ‘‘E-Maintenance’’ can be defined as a maintenance support including resources, services and management necessary to enable the implementation of a proactive process of decision making in maintenance. This support includes not only Internet technologies, but also ‘‘e-maintenance’’ activities (operations and processes) such as ‘‘e-monitoring’’, ‘‘e-diagnosis’’, ‘‘e-prognosis’’, among others. Another important aspect of the proposed model is the technical training and staff involvement at all levels within the organization. The active and committed participation of all personnel involved in the maintenance area will be a critical factor to the success and continuous improvement. Information between different processing units should be as easy and simple as possible for correct interpretation and implementation. 8.1 Why is it important the use of the proposed methodologies to support maintenance management? The importance of root cause analysis tools in maintenance relies on the need to understand the main causes of failure on which management or operations may have some control. This is so they can avoid the chronic failure and return to a specified plan of action. The utility of this methodology lies in the fact that it not only asks ‘‘What happened’’ but also asks ‘‘why did this happen’’, rather than focus on ‘‘who is to blame?’’ FMEA can be used at the stage of weaknesses analysis of critical equipment, where an assessment of causes, failure modes and effects can be relevant. The identification of the failure modes is important because it provides a detailed description of how the event occurs. FMEA takes a different approach and proactively aims to prevent failure. It is a systematic method of identifying and preventing product and process failures before they occur. It does not require a specific case or adverse event, but rather, a highrisk process which is chosen for study and where an interdisciplinary team asks the question ‘‘What can go wrong with this process and how can we prevent failures?’’ Using a single method may lead to an incomplete analysis; therefore, in some specific cases there may be appropriate integration tools, especially when dealing with complex systems, and better results can be achieved. In fact, one of the common combinations to support the RCA analysis is FMEA and fault tree analysis (Li and Gao 2010). 123 Int J Syst Assur Eng Manag For the contribution and added value in the maintenance management, this research has proposed an entire model which characterized the course of actions to be implemented, in order to ensure efficiency, effectiveness and continuous improvement of the management process. 8.2 Advanced software tools to support maintenance management The need to implement a software tool that supports the global management of maintenance will be justified and the main advantages obtained will be set out: • • Availability of information for decision-making: cost control, critical equipment, spare parts, suppliers, staff or any other relevant parameters. Management for resources, planning and monitoring the maintenance execution. A maintenance management software allows the capture and use of a large amount of data and parameters. The main operational features that any software tool of maintenance management must have are: • • • • • • • • Creation or connection with database facilities: technical data, operational status, related costs and value of the assets. Storage and analysis of operations historical data: date, duration, cost, operators, equipment, spare parts, etc. Set alarm levels for certain parameters. Planning and task management, resources and inventory. Hierarchy of systems and equipment. Control the status of each work order and execution of preventive maintenance programs. Reporting. Analysis of failures. 8.3 Integration of tools and enabling for the computer system It is necessary to generate a common integration policy at all levels of the organization, thus, all the software tools, to support different business units and processes of integration, should achieve a common language that facilitates the use of multi-user, knowledge generation, the management analysis of the units and the global economic evaluation that impacts on the business, among others. For this reason, the integration of these software tools with the existing database in the organization (CMMS and other EAM systems) is key to the success of its implementation. System integration and the simplicity of implementation are, and will be, decisive factors in the 123 future development of such software, i.e. in the evaluation of it by an organization. 8.4 Selection of critical spare parts In any kind of industry, companies satisfy, with their activity, a product demand. The answer to this demand is made with efficiency (profitability) criteria, which typically include minimum cost and maximum customer satisfaction. This translated into maintenance means minimizing spare parts inventory and ensuring the availability of equipment required. However, the complexity of the systems makes the satisfaction of both criteria difficult, and sometimes even opposed. From the technical perspective, the more spare parts that are available in stock the more it ensures the availability of equipment. From the economic point of view, the fewer spare parts are stored, the less immobilized capital will be. So, it is clear that the parts inventory is important, as it represents a high cost of storage when it is present, and when it is not present it may result in extremely high costs due to unavailability. It is therefore necessary to find formulas that ensure the desired level of availability of equipment with the least possible capital assets. The Table 4 shows some key aspects to be taken into account when selecting the critical spare parts. These follow a logical sequence: In the main scheme (Fig. 8), the definition of critical spare parts is integrated into the design phase of planning, programming and implementation of maintenance. Thus, it can be understood how these three stages are fed back to determine the critical spare parts. It is also necessary to clarify that the criticality analysis and weak points are taken into account when determining the critical spare parts. Furthermore, considering all possible variables, according to the context, may affect one way or another, the optimal management of the spare parts in an organization. 8.5 Principles of the BSC in the global maintenance management The BSC is a process of dialogue and communication in all areas of an organization including the maintenance area, to the extent that this communication process works and achieves greater participation, alignment and synergy. The management of financial and technical indicators allows the company to use the same language on maintenance management. Financial prospects, customers, processes and learning, suggest, for example, performing calculations such as availability in function of the mean time to repair, and mean time to failure. This improves the Int J Syst Assur Eng Manag Table 4 Aspect to considerer in the critical spare parts selection Equipment criticality It uses the information from the criticality matrix to determine which spare parts are critical, depending on the consequences of the failure of equipment to which they belong. Thus, the spare parts storage will consist mainly of C and SC equipment components, and to a lesser extent, NC equipment components Consumption After analyzing the history of breakdowns, or the list of items purchased in previous periods (one or two years), it can determined which items are consumed regularly. All those elements that are consumed regularly and are low cost must be considered on the list of critical spare parts. Thus, the elements of pumps that are not critical, but often break down, should be in stock (seals, impellers, fasteners, etc.) Term Supply Some pieces have an almost instant and constant availability from suppliers near the plant. Others, however, are made to order, so their availability is not immediate, and even delivery can take months. The parts that belong to critical equipment, where delivery is not immediate, should integrate the critical spare parts list. The other parts, which makes it look that SC equipment stays out of service for a long time, which are not yet C equipment, must be considered equally on this list Cost The cost is crucial. In general, those high-priced items (main lines, large crowns) should not be stored, but be subject to an effective predictive maintenance system Table 5 General application of the BSC approach to maintenance management Mision and strategy Strategic objectives Indicators (kpis) Goals Action plans Perspective Improving the effectiveness of maintenance costs Maintenance cost per unit of output (%) Actual: (X)% Ensure adequate data acquisition and the analysis of criticality of equipment Financial Improve time to repair and maintenance quality Repetitive failures. MTTR Programming failure analysis. Improved maintenance support Customers Reduce MTTR in Y % Improving the maintenance process and its documentation Fulfill the regulation rules Certificate of maintenance before dd.mm.yyyy Develop procedures and technical inspections Internal processes Ensuring adequate levels of training and education to fulfill the mission Level of training for each level of maintenance Definition of levels of training required for each maintenance level Definition of levels of training required for each maintenance level training and evaluation Learning Objective: (X-1)% Repetitive failures \X relationship between parameters such as production, costs and availability. The ultimate goal of the BSC applied to maintenance management is to transform the strategic maintenance objectives for concrete action plans based on key and comparable management indicators. These are developed from the four perspectives of the methodology (Table 5). The process involves setting indicators, goals and action plans to be achieved. This way the management can start aligning with business objectives, especially if the development of key indicators goes through a series of functional indicators, the results that are obtained in the different processes of the business will be closer, and therefore, easier to measure and control. The BSC enables deployment and full implementation of the maintenance strategy at all levels in the company. This encourages the involvement of all those concerned in achieving the strategic objectives and achieving strategic alignment across the organization, from the transformation of the strategic plans to concrete action plans. 9 Conclusions The maintenance requirements have changed dramatically in recent years and the evaluation of maintenance strategies, the selection of tasks and ultimately the overall management of maintenance in an organization cannot be carried out at random or in an informal way. The objectives of any model of maintenance management are identified and dependent on the business plan of the organization. The maintenance strategies should always be aligned with the business plans of the company, since the accomplishment of the maintenance objectives depends on this, and also the business plan of the organization itself. This paper presents an advanced model for global maintenance management in a closed cycle of continuous improvement in seven stages. This is based on a review of a representative set of maintenance management models, which follow a logical sequence of hierarchical action. For the contribution and added value in the maintenance management area, this research proposed an entire model which characterized the course of actions to be 123 Int J Syst Assur Eng Manag implemented, in order to ensure efficiency, effectiveness and continuous improvement of the management process. The proposed model allows the alignment of the local maintenance objectives with the global business objectives within a framework of continuous improvement. In addition, it supports the logical decision-making from management and optimization. This is carried out in a continuous way in all processes that deal with planning, programming and implementation of maintenance. It also takes into account the operational context and considers all the restrictions that can affect the efficiency and/or effectiveness of maintenance management. Currently, the presented model is being implemented in different industries in the mining sector (Chile) and the facilities of the Panama Canal. The logical sequence of its stages provides a practical and useful implementation on the industry. This process will enable authors to develop a case study to validate each stage of the proposed model, identifying possible improvements based on new needs identified during the implementation. The interest showed by several industry areas about this proposed model provides feedback for future improvements. Acknowledgments The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013 under grant agreement no PIRSESGA-2008-230814). This research is funded by the Spanish Ministry of Science and Innovation, Project EMAINSYS (DPI2011-22806) Sistemas Inteligentes de Mantenimiento. Procesos emergentes de E-maintenance para la Sostenibilidad de los Sistemas de Producción, besides FEDER funds. The authors also wish to thank the reviewers for their valuable comments which certainly improved the quality of this paper. References Abran A, Blugione L (2003) A multidimensional performance model for consolidating balanced scorecards. Adv Eng Softw 34(2003): 339–349 Abudayyeh O, Khan T, Yehia S, Randolph D (2005) The design and implementation of a maintenance information model for rural municipalities. 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