Preventive Maintenance.Part

MaintainabiUty is a characteristic of design, installation, and operation, usually expressed as the probabiUty that a system can be restored to specified operable conditions within a specified interval of time when maintenance is performed in accordance with prescribed procedures. The ease of fault detection, isolation, and repair are all influenced by system design and are principal factors contributing to maintainabiUty. Also contributing is the supply of spare parts, the supporting repair organization, and preventative maintenance practices. MaintainabiUty must be designed into the equipment. Some factors to consider foUow. 

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. 

Flow rate changes are sometimes used in the design of local exhaust systems. An example of this is the use of dampers, blastgates, or valves that are interlocked with the machinery of interest. When the tool is on, the damper is opened and air is exhausted from that hood. When the tool is off, the damper is closed and more exhaust air is available to other parts of the system. These kinds of systems diminish the cost for running the system but increase the cost for installation as well as periodic preventive maintenance. The supply system... 

Predictive maintenance is part of planned preventive maintenance. In order to determine the frequency of checks you need to predict when failure may occur. Will failure occur at some future time, after a certain number of operating hours, when... 

In addition to the product, the designer, equipment installer, user, and all others involved in production should all consider performing a risk assessment and target in the direction of perfection. The production is reviewed for hazards created by each part of the line when operating as well as when equipment fails to perform or complete its task. This action includes startups and shutdowns, preventative maintenance, QC/inspection, repair, etc. 

The mechanical integrity section of the PSM standard ensures that the equipment, piping, relief systems, controls, and alarms are mechanically sound and operational. The requirements include (1) written procedures to maintain functioning systems, (2) training regarding preventive maintenance, (3) periodic inspections and testing based on vendor recommendations, (4) a process to correct deficiencies, and (5) a process to ensure that all equipment and spare parts are suitable. 

Maintenance Normal wear and tear as well as aging of various components may compromise the performance of the instrument or lead to operation failure. The instrument needs to be maintained in order to function consistently and reliably. A preventive maintenance program which identifies and replaces the consumable parts will likely save time and money in the long run. The usage and service records... 

Most laboratory systems require maintenance and inclusion preventative maintenance programmes. Therefore any holistic testing should form part of Performance Qualification to ensure on-going compliance. 

The wastes generated during paint application are primarily due to 1) paint overspray, and 2) the failure of the application which requires the stripping, cleaning, and repainting of the item. Source reduction can be achieved by use of low overspray application equipment, proper operator training, preventive maintenance, and parts inspection. 

The third category of equipment SOPs describes maintenance. These SOPs are similar in nature except that they relate specifically to equipment used in production and testing. Highlights of these procedures include preventive maintenance by lubrication, replacement of worn parts, disassembly and cleaning, oil and filter changes, and inspection of problems. 

The maintenance plan will normally form part of the preventative maintenance system for the site and must be used to track all maintenance activities on the computer system and associated measurement and control instrumentation. For computer systems the supplier may be contracted for different levels of ongoing maintenance support, and it is acceptable to use the supplier procedures for maintenance of the specialist areas of the system. A supplier maintenance contract needs to define the scope of maintenance (e.g., the items to be maintained, type of activities, period of the contract, access requirements,... 

The procedural controls applicable for the preventive maintenance and repair of the hardware provide a mechanism for anticipating problems and, as a consequence, possible loss of data. Modem hardware usually requires minimum maintenance because electronic circuit boards, for example, are usually easily replaced and cleaning may be limited to dust removal. Diagnostic software is usually available from the supplier to check the performance of the computer system and to isolate defective integrated circuits. Maintenance procedures should be included in the organization s standard operating procedures. The availability of spare parts and access to qualified service personnel are important for the smooth operation of the maintenance program. 

The oil is periodically replaced to perform its intended functions effectively and to sustain reliability of the components and system. This activity is carried out as a part of preventive maintenance as per the manufacturer s recommendation. The oil change frequency is a function of various factors including operating and environmental conditions, and maintenance practices. The cost of lubricating oil represents an important component of the operating cost of a vehicle and is about 60 to 70% of the fuel cost. 

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. 

Inspection and Preventive Maintenance As with all water-based extinguishing systems, particularly those installed outside, inspection and preventive maintenance are critical to reliable operation. Detection devices are typically inspected, tested, and maintained quarterly or at a frequency deemed more appropriate for a particular location. The water-spray system itself is typically flow-tested at least annually (NFPA 25, 1995). Because of the nozzles small orifice size, scale and corrosion buildup can compromise flow and spray patterns. The use of strainers and the conduct of flow tests will help minimize this potential problem. As stated earlier, preventive maintenance of the overall water supply and distribution systems is an integral part of a reliable system. 

Inspection and Preventive Maintenance When a steam curtain is to be used to mitigate the consequences of a flammable material release, it must be treated as if it were part of the site s firefighting system. This means that a managerial system must be in place to ensure that the steam curtain system is inspected periodically. Deficiencies should be reported and repaired promptly. Follow-up investigations must be made to ensure that the inspections, deficiency reporting, and repairs occur in a timely manner. If the system must be shut down for the repairs, the same procedures that would be followed for a sprinkler or deluge system shutdown should be utilized. 

It is also critical to maintain the emergency response plan over time. Changes in operations should be reflected, whether they are process-, equipment-, or personnel-related. Similarly, training should be conducted periodically and emergency response equipment maintained regularly as part of a formal preventive maintenance program. 

Some firms use Reliability Centered Maintenance (RCM) as part of their preventative maintenance strategy. 

Operating procedures for maintenance should be in place for every system component that requires periodic calibration and/or preventive maintenance. The idea is to replace critical maintenance parts before they have a negative effect on the quality of analytical data. 

Typical activities associated with the periodic review phase for instramentation inclnde establishing a recalibration program and conducting rontine maintenance activities as part of a plaimed preventive maintenance scheme. All maintenance activities mnst be carried out under a formal change control procedure and any associated testing mnst be fnlly documented nsing test record sheets. 

A friend of mine told me about his way of cleaning keyboards Remove the electronics and then place the keyboard in a dishwasher in the rinse cyclel Then, let them air dry. I wouldn t recommend this for some of the newer, capacitive keyboards. However, this will actually work for the older keyswitch keyboards (as long as the water isn t hard enough to leave residue inside the key switches or hot enough to melt the keys). Jet-Dry, anyone My friend actually had a part-time business—PM PM (Preventative Maintenance at night) and offered keyboard cleanup services for 20 eachl (In the late 70s this was easy moneyl)... 

A new methodology designed to optimize both the planning of preventive maintenance and the amount of resources needed to perform maintenance in a process plant is presented. The methodology is based on the use of a Montecarlo simulation to evaluate the expected cost of maintenance as well as the expected economic loss, an economical indicator for maintenance performance. The Montecarlo simulation describes different failure modes of equipment and uses the prioritization of maintenance supplied, the availability of labour and spare parts. A Genetic algorithm is used for optimisation. The well-known Tennessee Eastman Plant problem is used to illustrate the results. 

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