6) Consider the following two schemes: a) Scheme a power plant including four sm
ID: 2291089 • Letter: 6
Question
6) Consider the following two schemes: a) Scheme a power plant including four small generating units in flyear and which is perfectly maintained b) Scheme 2- the same power plant as in Scheme 1 but left without maintenance until the system fails parallel with identical failure rates of 0.4 Compare the reliability and maintenance activities (the number of corrective actions and the number of component replacement) for 20 x 1-year missions. Consider that the cost of each corrective action is $1,000 and the cost of each generating unit (i.e., component) s $100,000. Also, you benefit $1,000,000 for every 0.01 improvement in the reliability value (e.g., if reliability goes up from 0.01 to 0.02, you benefit $1,000,000; and it goes up from 0.01 to 0.03, you benefit $2,000,000). Then, which scheme is more beneficial, scheme (a) or (b)?Explanation / Answer
In General Maintenance activities can be Classified as
1) Predictive Maintenance
2) Planned Maintenance
3) Break down Maintenanace
Doing conditional monitoring of equipments will help to improve equipment Life
Scheme 1 will be the more beneficial one
The fault rate is 0.4f / year.this means we are achieveing 99.6% of Power plant Effieciency in a year
With the help of predictive Maintenance corrective actions can be done.and for each corrective action $1000 is spent.
For Example in a induction motor present in a power plant greasing of a motor helps to improve the motor runnability. If no greasing is applied motor bearing will be torn out.which will result in replacing the motor frequently.
if you consider for 20 years for each corrective action we get $80000
Without Maintenance cost of component to be changed is $100000
Hence Scheme1 is efficeint and reliable
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