Increases chances of accidents and less safety for both workers and machines More spoilt materials Direct loss of profit SHUT DOWN MAINTENANCE: Read from pdf file EVENT BASED MAITENANCE: Condition / Inspection Citizen Enquiry Job/Maintenance Comments 1. “Run to Failure” or “Reactive”: where budgets are far outweighed by the available resources, both staff and money. Only done in response to an event, i.e. a report from other staff or citizen Often the only way the Custodian will get to know of an asset “failure” or “suspected failure” Sometimes Citizen reports initiate jobs, other times it initiates a technical inspection Common the Custodian makes a judgement in the environment of limited funds e.g. Tree Maintenance. In such cases, Insurance cover represents a “hidden cost” 2. “Event driven” maintenance: where an event drives the need for action. Can be performed by generic staff using a “list of observations” or a locally generated framework. Often categorised by the Asset Custodian as a “Service request” The likelihood of the job ahead sometimes depends on budget and sometimes on Legislation or local service levels Here, the asset may not have intrinsically failed but the job will “provide a service”, e.g. the service of providing clean streets 3. “Calendar based”, “Pre-planned” or “Routine” maintenance. This maintenance is performed on Not required in relation to the regular maintenance. be performed on an ad-hoc basis in Usually comments on the condition of the or an event requiring an ad-hoc Pre-planned pattern of jobs based on the domain science and studies made by experts in relevant circumstances. Examples are Grounds Maintenance, Street Sweeping and Refuse collection. Sometimes dependent on local budgets and political considerations.
equipment on a calendar schedule. An example is the maintenance that is done on an every year before summer. With the maintenance plan in place, the maintenance is performed each time the calendar rolls over the specified number of days. response to an “unusual event”. maintenance action 4. “Statistical a preventative maintenance technique common with machine and possibly vehicle maintenance. Not required in relation to the regular maintenance. be performed on an ad-hoc basis in response to an “unusual event”. Reports an unusual event as the principle is to maintain 100% availability. Similar to no 3 the pre-planned pattern of maintenance is based on previous studies by domain or asset experts. Often used for vehicles, plant and production machinery 5. “Condition based”: often where a human inspection results in maintenance actions being collated and then issued as funds allow. Is the basis for this maintenance type. Sometimes the inspection will be prescribed by Code of Practice or Legislation. Where received usually initiate a technical inspection. Jobs collected from Inspections cannot always be executed, due to budget limitations, building up a “Work-bank” or backlog Roads, Bridges, Play Equipment are all examples of where this is used in the “Municipal” context 6. “Predictive Maintenance” on science or condition readings: visual or sensor-based An inspection or sensor will take condition readings and, based on readings, jobs are proposed No usually relevant Jobs aim to prevent failure and minimise “down-time” Common maintenance is costly (e.g. Street Lights) and for some types of machinery. 7. “Reliability Centred Maintenance”. It is generally used to achieve Inspections may be made “on the in the case of “Rotable Assets” or done Not usually involved, although operating these assets Carrying out jobs on assets “on the bench or closed down results in better reliability RCM starts with 7 questions: What is the item supposed to do and its
improvements in fields such as the establishment of safe minimum levels of maintenance, changes to operating procedures and strategies and the establishment of capital maintenance regimes and plans. Successful implementation of RCM will lead to increase in cost effectiveness, machine uptime, and a greater understanding of the level of risk that the organization is presently managing. for very high cost assets where reliability has a high consequence, e.g. production line machines, airline engines and so on. when machinery is taken out of use on a production line (line switched off or rotable assets within the production line) will report unusual performance and will usually be trained to act as eyes” with high capital cost items. associated performance standards? In what ways can it fail to provide the required functions? What are the events that cause each failure? What happens when each failure occurs? In what way does each failure matter? What systematic task can be performed proactively to prevent, or to diminish to a satisfactory degree, the consequences of the failure? What must be done if a suitable preventive task cannot be 8. “Financially Optimised Maintenance”: Carry out Maintenance to fit the available funds. In Public life in the UK and other countries, we might notice PMS and Bridges moving in this direction. If instrument is not in working condition first repair that Can be any mix of machine based, visual or sensor. Citizens report in non-expert mode so expert inspections usually ensue Jobs depend on budgets as other options are available: e.g. close a road, restrict bridge width available to vehicles. Pavement Management is typical and Bridge Maintenance in the UK is heading in that direction with the Bridge Condition Index (BCI).
documented as scheduled before cut-off time. Downtime unscheduled When a system is down, and the downtime was NOT documented as scheduled before cut-off time. Emergency Work Emergency work is a synonym to work. Equipment History Documentation for all events such as repairs, modification, and preventive maintenance performed for a specific equipment. Estimated Replacement Value Estimated present value of assets. Failure Developing Period The time lapsed between a failure and the break down. Repair Any activity intended to bring a component, equipment, or system back to a specific condition. Repetitive work Type of work that are done in the plant. Repetitive