The storage tank system shown in Figure 11-18is used to
Question and Solution
The storage tank system shown in Figure 11-18is used to store process feedstock. Overfillingof storagetanks is a common
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The storage tank system shown in Figure 11-18is used to store process feedstock. Overfillingof storagetanks is a common problem in the process industries. To prevent overfilling, the storage tank is equipped with a high-level alarm and a high-level shutdown system. The high-level shutdown system is connected to a solenoid valve that stops the flow of input stock. a. Develop an event tree for this system using the "failure of level indicator" as the initiating event. Given that the level indicator fails 4 timeslyr, estimate the number of overflows expected per year. Use the following data: b. Develop a fault tree for the top event of "storage tank overflows." Use the data in Table 11-1to estimate the failure probability of the top event and the expected number of occurrences per year. Determine the minimal cut sets. What are the most likely failure modes? Should the design be improved?
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