Mechanical Availability. This usually equates to the financial performance of the asset. The exergy of a given system is defined as the maximum useful work (total work minus P*dV work) that is obtained in a process in which the system comes to equilibrium with its surroundings. Availability is calculated using the following formula: Calculation of multi-component systems. Mechanical availability. The components provide availability percentages from a corporate, fleet-wide perspective and an operational unit level, respectively. Availability/ Available Energy/ Exergy First of we all should know that availability, available energy and exergy are different names of the same thing. Mechanical availability is a measure of a refinery or process unit's capacity to operate based on the condition of the equipment, without adjusting for any other operational or commercial limits. Say the mixer shuts off every hour, while a properly functioning mixer can continuously work for 24 hours without issues. As a hypothetical example, imagine a faulty mechanical mixer. {{shiftStartFormatted}} – {{shiftEndFormatted}} = {{shiftLength}} minutes. The wind power formula is given in terms of velocity of wind, area of the blade and air density. Mechanical availability is a key metric for the maintenance organization of a refinery. These calculations have been based on serial and parallel availability calculation formulas. To calculate availability, we first need to determine the duration of the shift in minutes. Availability will consist of two components: Materiel Availability (fleet) and Operational Availability (unit). "In general, for any software service or system you can think of, 100% is not the right reliability target because no user can tell the difference between a system … The effective reliability and availability of the system depends on the specifications of individual components, network configurations, and redundancy models. Then subtract breaks, lunches, and … This is effectively the maximum physical capability for the hardware. The higher the figure of the MTBF, the longer the system will likely run before failing. Availability is an Operations parameter as, presumably, if the equipment is available 85% of the time, we are producing at 85% of the equipment's technical limit. Calculating System Availability. By continuing with the above example of the AHU, its availability is: 300 divided by 360. So, while MTTR measures availability, MTBF measures availability and reliability. The last step involves computing the availability of the entire system. The mechanical power is converted into electricity which acts as a useful source. To calculate availability, use the formula of MTBF divided by (MTBF + MTTR). It is commonly used today in mechanical and electronic systems design, safe plant operations, product procurement, and so on. Availability and utilization of equipment for a year Equipment Shovel Dumpers Dozer Parameter L6 H31 H32 H33 H34 H37 D4 Spoil removal (in hours) 1756.10. Persamaan untuk menghitung mechanical availability yakni: MA = working hours /(working hours + repair hours) x 100%. Working hours yang dimaksud yakni waktu yang dimulai dari operator /crew berada di satu alat dan alat tersebut berada dalam kondisi operable (mesin dan bagian-bagian lain siap dipakai operasi). The input and output transducers have fairly high availability, thus fairly high availability can be achieved even without redundant components. 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