Maintenance life cycle

Fixed and rope-guided options were examined for a dual skip configuration, specifically to examine the cost and benefits of the resultant variations to shaft diameter, life-cycle maintenance costs and efficiencies to be gained through changes in conveyance dimensions, hoist cycle-times and headframe height. The base case option (rope guidance) was shown to be feasible within a 5.5m diameter circular shaft cross-section. 

STEP mainly contributes to worldwide open systems networking communication of product data for neutral data exchange between heterogeneous systems, both in-house and with third parties, long-term archiving, system-independent architecture, flexible migration policies. It also contributes to paperless and life-cycle maintenance support. 

Barone, G., Frangopol, D.M. 2014. Reliability, risk and lifetime distributions as performance indicators for life-cycle maintenance of deteriorating structures. Reliability Engineering and System Safety 123, 21-37. 

Bandyopadhyay, D. Safety Management Ships. Journal of the Institution of Engineers (India), Part MR Marine Engineering Division 84, no. 2 (2003) 45-48. Bankes, F. W., and M. H. Spicknall. Importance of Considering Life-Cycle Maintenance and Modernization Costs in the Design of Navy Ships. Journal of Ship Production 7, no. 4 (1991) 227-233. 

Life cycle cost analysis is the proper tool for evaluation of alternative systems (11,12). The total cost of a system, including energy cost, maintenance cost, interest, cash flow, equipment replacement and/or salvage value, taxes, inflation, and energy cost escalation, can be estimated over the useflE life of each alternative system. A Hst of life cycle cost items which may be considered for each system is presented in Tables 3 and 4. Reference 14 presents a cash flow analysis which also includes factors such as energy cost escalation. 

Product innovation absorbs considerable resources in the fine chemicals industry, in part because of the shorter life cycles of fine chemicals as compared to commodities. Consequently, research and development (R D) plays an important role. The main task of R D in fine chemicals is scaling-up lab processes, as described, eg, in the ORAC data bank or as provided by the customers, so that the processes can be transferred to pilot plants (see Pilot PLANTS AND microplants) and subsequently to industrial-scale production. Thus the R D department of a fine chemicals manufacturer typically is divided into a laboratory or process research section and a development section, the latter absorbing the Hon s share of the R D budget, which typically accounts for 5 to 10% of sales. Support functions include the analytical services, engineering, maintenance, and Hbrary. 

Explosion-welded constmction has equivalent or better properties than the more compHcated riveted systems. Peripheral benefits include weight savings and perfect electrical grounding. In addition to lower initial installation costs, the welded system requires tittle or no maintenance and, therefore minimizes life-cycle costs. Applications of stmctural transition joints include aluminum superstmctures that are welded to decks of naval vessels and commercial ships as illustrated in Figure 11. 

Economic Factors These inchrde capital cost (eqrripment, installation, engineering, etc.), operating cost (rrtUities, maintenance, etc.), emissions fees, and life-cycle cost over the expected eqrripment lifetime. 

Improving the economics of gas plant design, construction, and operations is essential to ensure the approval of future de-bottlenecking, capacity expansion, and new projects. The economics include not only capital investment, life cycle operations, and maintenance costs, but also the monetary equivalents of safety, reliability, and availability. 

Maintenance practices are being combined more and more with operational practices to ensure that plants have the highest reliability with maximum efficiency. This has led to the importance of performance condition monitoring as a major tool in the operation and maintenance of a plant. Life cycle costs, rightly so, now drive the entire purchasing cycle and thus the... 

If a life cycle analysis were conducted the new costs of a plant are about 7-10% of the life cycle costs. Maintenance costs are approximately 15-20% of the life cycle costs. Operating costs, which essentially consist of energy costs, make up the remainder, between 70-80% of the life cycle costs, of any major power plant. Thus, performance evaluation of the turbine is one of the most important parameter in the operation of a plant. 

A new maintenance system is introduced based on the new mantra for the selection of all equipment Life Cycle Cost. This new system especially for major power plants is based on the combination of total condition monitoring, and the maintenance principles of total productive maintenance, and is called the Performance Based Total Productive Maintenance System. ... 

Life-cycle analysis (LCA) does not account for economic aspects, and such analysis should therefore be considered together with a life-cycle cost analysis (LCC), which takes into account the costs of investment, energy, maintenance, and dumping the final waste product throughout the lifetime of a plant. 

Considering the energy and maintenance costs during the life cycle, the cheapest investment is not always the best. It may, for instance, be profitable to buy a ventilation unit with a heat recovery system, which may increase the unit investment by 50%. The return on the investment in such a case may be in excess of 20%. 

Capital investment decisions are best made within the context of a life-cycle cost analysis. Life-cycle cost analysis focuses on the costs incurred over the life of the investment, assuming only candidate investments are considered that meet minimally acceptable performance standards in terms of the non-inonetary impacts of the investment. Using life-cycle analysis, the capital investment decision takes into account not just the initial acquisition or purchase cost, but maintenance, energy use, the expected life of the investment, and the opportunity cost of capital. When revenue considerations are prominent, an alternative method of analysis such as net benefit or net present value may be preferred. 

Plan for the maintenance and retirement of the product through its life-cycle... 

Condition monitoring, life cycle costing and predictive maintenance procedures should all be considered during the preparation of the planned maintenance system. 

This is the method of establishing the cost of the plant and equipment over its recognized life cycle. In maintenance situations the design and specification elements may be ignored, but those that must be considered in establishing the life-cycle cost of plant and equipment will include ... 

The information on life-cycle costs gained with certain items of plant and equipment need not be true for a similar item in another location, as specific details on operating hours, and maintenance attendance can vary markedly. Also, it may be an auxiliary part (e.g. an electric motor) of a major component. Therefore, it may have an entirely different set of parameters. An important element that must be examined in detail when establishing life-cycle costs of a specific item of plant and equipment is the demand placed on energy resources by them. 

It follows that any maintenance program introduced for specific plant and equipment must be designed so that all maintenance costs are recorded. This would then be taken into consideration when the life-cycle cost of the item is assessed, as it should be added to the loss of production if this has occurred due to any maintenance malfunction. Care must be taken when presenting the life-cycle cost to ensure that all elements within the cost cycle have been effective. 

The software life cycle activities extend until retirement of the software. However, in a manner of speaking, life cycle activities extend even beyond retirement since the data must be able to be reconstructed at any time during the life of the product, i.e., the archived record must always be accessible and readable even if the software is no longer commercially available or typically employed in the laboratory. Additional software validation includes implementation of the code and integration and performance testing. There also must be system security, change control procedures, audit trails, calibration, preventative maintenance, and quality assurance. 

A real discount rate of 10% was used to convert all future expenses and savings into current dollars. This allowed calculation of the net present value of the savings and costs. Also calculated were the discounted payback period and the simple payback period. Each of these quantities was calculated over a life cycle analysis period of 20 years, the assumed life of the mechanical system. Maintenance costs were considered to remain constant in real terms. 

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