There are 4 boilers if there is a 50 percent chance (who would buy such boilers?) that each boiler works for a year without any breakdown find the probability of realizing at least three boilers in operating condition afterone year.I calculated it like this,at-most one failure= all boilers work OR A fails OR B fails OR C fails OR D fails=(0.5x0.5x0.5x0.5) OR 0.5 OR 0.5 OR 0.5 OR 0.5=(0.0625 OR 0.5) OR 0.5 OR 0.5 OR 0.5........The answer comes out to be 0.8828Is my logic correct?Also anyone knows about matrix method to evaluate reliability? Pls give some link.
Just so you will know, there are many, many boilers that will not run for a year without some problems. This is specially true due to the many safety features that they have. Burners and flame safety systems are very difficult to make error free due to the ability of the flame sensors to be 100% accurate.
no standard formula applies Reliability values (propose Time to Failure = MTF) are provided by way of the producer after a rigorous high quality controls sorting out utilising records for challenge MTF for all equipment with comparable pattern areas/manuf technique.. each and every pump/compressor might have various areas, all of that are component to the MTF try. Warranties often conceal a plenty shorter time than the MTF of the equipment
