TAILIEUCHUNG - Improving Machinery Reliability 3 Episode 12

Tham khảo tài liệu 'improving machinery reliability 3 episode 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Maintenance Cost Reduction 469 especially applicable if alignment-related failure repair is performed by a relatively small part of the workforce and their labor data are available in breakout form. For example in a given facility perhaps only millwrights repair rotating machinery and their overtime hours go down after implementing a precision alignment program. Since there are likely to be relatively few millwrights compared to the overall maintenance workforce the factors having an impact on their overtime can be relatively easy to isolate. Energy Usage There have been several papers documenting the energy savings of a precision alignment program. The savings claims vary from 3 to 12 but there is considerable debate about the measurement methods and validity of the data. As of 1996 there were at least two studies under way that attempted to more definitively study the issue. One is sponsored by the . Department of Energy and the results of that study will eventually be made public. All of the work and proposed calculations about energy savings due to alignment have been applicable only to machinery driven by electric motors. Although one might expect any savings to apply to turbine-driven machinery we are unaware of data to substantiate this. Our worksheets pages 470 -76 should apply equally well to any type of driver but the illustrations will all use electric motors. Methods for evaluating energy savings realized from improved alignment fundamentally fall into two categories real power and apparent power. To simplify a rather technical definition apparent power savings are calculated from changes in volts and amps. Real power by contrast is a sophisticated measurement involving not only volts and amps but also power factor or phase. In most industrial facilities real power is the basis upon which the elecưical bill is computed so it would be the better value to use. The caveat is that real power is problematical to measure with common volt and amp meters. .

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