Corrective maintenance

Maintenance management activities ensure cooling system functional performance and will cover operational maintenance, corrective or emergency maintenance, and routine preventative maintenance. 

A third SOP category relating to the physical facility covers the plant maintenance function. The key consideration in these SOPs for manufacturing the highest-quality products most efficiently is preventive maintenance. Correcting a breakdown in a plant support system (e.g., a motor burned out because it was... 

Lot data control, including the identification and maintenance (corrections, deletions, restrictions) of the lot data and content/ingredients calculations Further testing, including areas such as material storage, MRP n, cleaning protocols, product content, and archiving... 

Independence comes when you take on the responsibility for the system—its maintenance, correct operation, and at least minor repairs. 

The terminology used for keeping the pavement at a tolerable level of service differs significantly from country to country. In most of the countries, the following terms are used routine maintenance, preventive maintenance, corrective maintenance, major maintenance or pavement rehabilitation, strengthening and rejuvenation. 

In order to achieve effective, safe, and reliable operation of all equipment in the inventory, the hospital uses interval-based inspections and preventive maintenance, corrective maintenance, or metered maintenance strategies. Model-specific strategies and preventive maintenance procedures developed for this equipment based on the risk stratification, the AHA Manual for Medical Equipment, manufacturer guidelines, and NFPA or ANSI standards. 

Mechanical. Manholes, isolation facilities, vents, drains, cleanout/ steamout facilities, and access all acceptable for entry and maintenance correct interface for agitators, etc. correct shape and finish for internal lining system (if any) correct configuration and types of clip for refractory and insulation (for all vessels requiring them, but especially for heat-treated vessels) provision for in-line inspection (tell-tales, underfloor drainage) when needed transport... 

Corrective maintenance. Corrective maintenance refers to action taken only after a system or component failure has occurred. It is thus a retroactive strategy. The task of the maintenance team in this scenario is usually to effect repairs as soon as possible. Costs associated with corrective maintenance include repair costs (replacement components, labor, and consumables), lost production, and lost sales. To minimize the effects of lost production and speed up repairs, actions such as increasing the size of maintenance teams, using backup systems, and implementation of emergency procedures can be considered. Unfortunately, such measures are relatively costly and/or effective only in the short term. For example, if heat-exchanger tubes have... 

This hst of basic items covered ia a mock OSHA iaspection appear to be obvious items that any faciUty should observe. However, nearly every safety or fire iaspection uncovers these items duriag iaspections, causiag the faciUty to receive fines or warnings because maintenance people do not perform their own regular and thorough iaspections of their faciUties to avoid corrective actions by code enforcing agencies. 

Issuance of a United States patent transforms a patent appHcant into a patentee, and new concerns may arise relevant to management. For example, the patent should be reviewed to determine formal and substantive correctness. An audit should be taken regularly to determine whether there is a continuing justification to pay the maintenance fees required to keep the patent in force during its effective period. The patentee or patent assignee may have to address concerns of patent infringement or patent vaHdity. 

Condensa.te Return Systems. Ia a process plant, steam traps are used to drain and return condensate. Given proper appHcation and continuous maintenance, these can operate with minimal steam leakage. Correct iastaHation is also important (12). 

There is also a distinct advantage in maintenance. When a problem with a phase is discovered and the phase logic is corrected, the correction is effectively implemented in all recipes that use the phase. If a change is implemented in the processing equipment, the affected phases must be modified accordingly and then thoroughly tested. These modifications are also effectively implemented in all recipes that use these phases. 

Another difficulty is assessing the potential for human errors. If redundancy is accompanied with increased complexity, the resulting increased potential for human errors must be taken into consideration. Redundant systems require maintenance procedures that can correct problems in one part of the system while the remainder of the system is in full operation. When conducting maintenance in such situations, the consequences of human errors can be rather unpleasant. 

Here the relay assesses the kVAr requirement of the system and switches ON all the required capacitors simultaneously. Theoretically any size of capacitor units can he used. But when a capacitor is taken out for maintenance, this can create confusion in the p.f. correction. The relay will not be aware of this and act accordingly. The bank size may also be large and cause switching surges. 

Adequate support from the facility staff is absolutely essential. The facility staff must help the analysis team gather pertinent documents (e.g., PSilDs, procedures, software descriptions, material inventories, meteorological data, population data) and must describe current operating and maintenance practices. The facility staff must then critique the logic model(s) and calculation(s) to ensure that the assumptions are correct and that the results seem reasonable. The facility staff should also be involved in developing any recommendations to reduce risk so they will fully understand the rationale behind all proposed improvements and can help ensure that the proposed improvements are feasible. Table 12 summarizes the types of facility resources and personnel needed for a typical QRA. 

This condition is probably misalignment, indicating a maintenance problem. The mechanic should be trained to correct this. Follow correct alignment procedures, as well as correct bolt torque procedures. 

The problem could be maintenance, operation, or design, or a combination of any or all these factors. In all honesty, you should never. see this set of evidence marks because it indicates a lack of control. Now because the mechanic cannot control operational problems or design problems, the first phase to correct this situation is to control the mechanical maintenance factors, like alignment, proper bolting and torque. sequences, be sure shafts are straight and round, and dynamically balance all rotary components. Reinstall the pump and wait for the next failure. Once the maintenance factors are under control, there should appear a clear vision and path to resolve any operational and/or design weaknesses. 

Consider the following graph. Figure 9-14. Radial loading on the shaft rises if the pump is operated too far to the left or right of the be.st efficiency zone. Another interpretation of the. same concept is to. say that the maintenance and problems rise when the pump is operated away from its BEP. Many pumps have a rather narrow operational window. These pumps can be very efficient if they are correctly specified and operated. This is discussed completely in Chapters 7 and 8 Pump Curves and System Curves. 

The storeroom techs must protect the mechanical seals handling them with extreme care. The engineer or technician must specify and select the seal components correctly. The mechanical maintenance technician must protect the seal at the moment of installation. Once the seal is installed into the pump, the seal requires the correct environmental controls to assure optimum life. At this point the work of the maintenattce technician ends. 

The maintenance team, that is to say, the mechanics, were found competent and they followed the correct maintenance procedures. This information eliminates the defects by maintenance. 

Effective and well planned maintenance can reduce the operating cost of your pumps and other ec]uipment as this example demonstrates. With differential pressure gauges on the pump, an amp meter and flow meter you can determine if strict tolerance parts arc worn. This indicates the need to take the pump into the shop for corrective procedures. If you don t do it, you are wasting your annual operating budget. As we mentioned in Chapter 6, the Wear Rings should be called Efficiency Rings. Now you know why. 

I he focus of industrial plant maintenance has always been that the de,sign is correct, and that the operation of the pumps in the. system is as it should be. In this book, you will see that in the majority of occasions, this is not true. Most of us in maintenance spend our valuable time, just changing parts, and in the best of cases, performing preventive maintenance, trying to diminish the time required to change those parts. 

In the event of failures due to lubrication problems, the failures should be thoroughly analyzed to determine if they were indeed caused by lubricant failure or incorrect maintenance procedures. Once the problem has been isolated, corrective action can be initiated to prevent subsequent similar failures—whether it requires changing lubricants or procedures. 

Reliability of the corrective measure based on operating and maintenance requirements and... 

---