Scheduled maintenance - meaning

However just stating these objectives will not make it happen nor will it provide the means of measuring the success of the program. Establish specific objectives, i.e. reduce un-scheduled maintenance by 20 per cent, or increase production capacity by 15 per cent. In addition to quantifying the expected goals, define the methods that will be used to accomplish each objective and the means that can be used to measure the actual results. 

A. Performance measiires The first step in establishing an effective maintenance basics program is to identify and establish performance measures. Most experienced managers have learned that you get what you measme. Successful pharmaceutical plants develop and implement a series of supportive key performance measures to track and manage improvement of maintenance/reliability. Examples are mean time between failure, maintenance cost per unit of output, percent planned and scheduled maintenance, preventive maintenance tasks completed, expense maintenance cost as a percentage of replacement asset value, etc. These indicators must be available to aU levels of an organization and shoiild be used to maximize individual and group contributions. It would be best if these indicators were part of the reliability-balanced scorecard. 

Indicators may be used to provide an objective, accurate measurement of the different services provided in the department. These can measure specific individual, team, and departmental performance parameters. Typical indicators might include simple tallies of the quantity or level of effort for each activity, productivity (quantity/effort), percentage of time spent performing each activity, percentage of scheduled IPMs (inspection and preventive maintenance procedures) completed within the scheduled period, mean time per job by activity, repair jobs not completed within 30 days, parts order for greater than 60 days, etc. 

Involves the systematic replacement of components, according to a predetermined schedule. This means the replacement of components whose life span is known. It also includes systematic lubrication jobs as well as minor upkeep work. This definition avoids confusion between systematic checking or even continual checking to determine the state of the equipment (conditional preventive maintenance) and systematic preventive maintenance. 

Time pressures exist when inadequate maintenance scheduling processes do not permit all required tasks to be carried out in accordance with maintenance manuals or other documentation. Or aircraft scheduling may mean that a deviation from checklists or procedures is required to minimize delays in getting the aircraft out of maintenance, or to ensure on-time departures. 

Equipment used to process, store, or handle highly hazardous chemicals must be designed constructed, installed and maintained to minimize the risk of release. A systematic, scheduled, test and maintenance program is preferred over "breakdown" maintenance " that could compromise safety. Elements of a mechanical integrity program include 1) identification and categorization of equipment and instrumentation, 2) documentation of manufacturer data on mean time to failure, 3 ) test and inspection frequencies, 4) maintenance procedures, 5) training of maintenance personnel, 6) test criteria, and 7) documentation of test and inspection results. 

Unscheduled maintenance activities are caused by essential equipment failures. Bccau.se these activities are not scheduled, the frequency and the mean duration of maintenance is based on statistics from experience. 

Most combustion equipment is not controlled by means of a feedback from flue gas analysis but is preset at the time of commissioning and preferably checked and reset at intervals as part of a planned maintenance schedule. It is difficult to set the burner for optimum efficiency at all firing rates and some compromise is necessary, depending on the control valves used and the control mode (e.g. on/off, fully modulating, etc.). 

Preventive maintenance is probably the most common type of maintenance practiced in chemical manufacturing plants. This usually means carrying out work to ensure that a piece of equipment will operate continuously and efficiently. PM tasks include regularly performed lubrication, parts replacement, and so on. PM is generally carried out routinely at set intervals, usually at a scheduled shutdown. PM has the downside of requiring work that may not be necessary and replacing parts that may still have useful life. 

In addition to these differences in the types of delta agonists used, these studies also differed in numerous environmental and subject-related parameters, including 1) route of delta agonist administration (central vs. systemic), 2) schedule of reinforcement (FR < 5 vs. FR > 30), 3) use of acquisition of self-administration in drug-nai ve subjects versus maintenance of self-administration in drug-experienced subjects as a means of evaluating reinforcement, and 4) species of subject (rat vs. rhesus monkey). A better understanding of the role of these variables will require further research. Overall, results from... 

Many of the equipment vendors have developed cost of ownership (COO) models, some traceable, at lease in part, to SEMATECH. These COO models may be used to account for all aspects of amortized costs and provide a user with a highly accurate anticipated cost schedule. At a minimum a COO model should include the cost of the system, utilities, facilitization, mean-time-between-failures, mean-time-to-repair, preventative maintenance, personnel, all consumable safety costs (including that of required support equipment), reactant, and substrate costs. Each of these parameters" should be well defined and guaranteed, and the user of such models should precisely understand how up-time, mean-time-to-repair, and other terms are defined. A 90% uptime schedule is useless if the system is routinely defined to be out of service, for maintenance, 25 % of the time. 

This may mean calibration at predetermined intervals of time or predetermined intervals based on utilization. The requirement for recalibration may well help define a schedule for routine preventative maintenance. 

Control is most successfully exerted by means of a control chart known as a Gantt chart, for whose drafting and maintenance a variety of labor-saving tools are now available. Two well-known and easy-to-use examples of project management software packages are Microsoft Project (Microsoft Corporation) and Schedule Publisher (AMS Software Inc.)... 

This technique is described in more detail in Chapter 54. It is especially useM when a variety of jobs are done intermittently (e.g., as in maintenance or ofiSce work). Assume that during a three-week period a maintainer spends 30% of the time doing carpentry, 40% painting, tmd 30% miscellaneous tMs means 120 M X 0.4 = 48 hr for painting. During the three-week period, 10,000 11 of waU were painted or 10,000/48 = 208 ft /hr. Note that the work method used, work rate, delays, production schedule, and so on are not questioned. 

It is essential that impressed current cathodic protection systems are properly maintained. This usually means that a budget system of training for personnel and maintenance schedule is developed by the client, engineer, corrosion specialist and contractor at the initial design and specification stage. 

Mold gaps must be minimized by means of increased clamping force and vertical flash faces, whereby increased tool maintenance should be scheduled due... 

Based on this risk assessment, managanent lists and schedules the work needed to be done to create a safe and healthy work environment and eliminate high-risk acts of people. This would mean the introduction of a suitable structured SMS based on world s best practice. All safety management systems should be based on the nature of the business and be risk based, management led, and audit driven. This could include having to guard machinery, demarcate walkways and work areas, purchase correct tools and equipment, and set up maintenance systems for equipment, etc. 

Facility configuration is controlled in accordance with the Conduct of Operations Manual by means of an Equipment Status List (ESL). The ESL also identifies all maintenance or corrective actions that cannot be completed due to lack of replacement parts, scheduling conflicts, or other extenuating circumstances. Inspection checklists and the operations narrative log play a major role in maintaining awareness of the status or operability of equipment. 

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