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Case Study Questions

Chagter1 595 CASE STUDY A PUMPER SYSTEM WITH AN ESI PROBLEM Based on previous loghook dala, the current estimtes f number of operating hours per yeur are as follows pumper system equipment is under consideration by Oulf Cosm chemical processing plet. One crucial pump moves bighly oorrosive liquids from specially lined tanks on intercoastal brges into morage and peeliminary refining f cilities dockside. Because of the variable quality of the w chernical and the high preswares imposed on the pump chas- s and impellers,a close log is mainsined on the nunwher of hours per year that the purep operimes. Safety records nd Hours per Ye 3 on Case Study Questions Detormine the econonic service life of the pump.How does the ESL compare with the maxium allowe trol points for this system As ourrently planned, rebuild and M&O cost estimates แre uncreased "cordingly when cuma- 2 The plaw sqperindendear told you, the safety engine lative operating time reaches the 6000-hour mark that only one rebuaild should he planned ow, becass these types of pumps usually have their minimu- life before the second rebuild. Determine amake alue for this pucmp that will force the ESL to be 6 years. Comment on the practicality of ESL.-6 yeaurs given the MV calculatnd You are the safety engineer a the plant. Esimates made fo this pump are as folkows First cost: Rebuald cost . In a separate conversation, the line manager told 150,000 whenever 6000 cumula ous one. A maximum of three ro 25,000 Sr each year 1 oh 4 after the fir retuaid, plus 15% per 10% per year you to not plan for a rebuild after 6000 hours be canse the pump will be replaced after a total of 10,000 hours of operation. The line manager wants to know what the base AOC in year 1 can be to make the ESL 6 years. He also toid you to assame now that the 15% growth rate applies from year 1 forward. How does this base AOC value compare with the rebuild oost after 6000 hours? What do you think of these suggestions from the plant superintendent and the line manager M&0 costs: