What is the dangerous undetected failure rate for a pressure transmitter with a total failure rate of 1.2 x 10 -6 f/hr and a safe failure mode split of 60%?

What is the dangerous undetected failure rate for a pressure transmitter with a total failure rate of 1.2 x 10 -6 f/hr and a safe failure mode split of 60%?

• A. 1.44 x 10 -7 f/h
• B. 4.2 x 10 -7 f/h
• C. 5.04 x 10 -7 f/h
• D. 3.36 x 10 -7 f/h

Answer: (A)

To determine the dangerous undetected failure rate for the pressure transmitter, you first need to understand the total failure rate and the safe failure mode split. The total failure rate is given as 1.2 x 10^-6 failures per hour. The safe failure mode split indicates what proportion of failures are considered safe, which in this case is 60%. This means that 60% of all possible failures are deemed safe, while the remaining 40% can lead to dangerous undetected failures. To find the dangerous undetected failure rate, you first calculate the proportion of the total failure rate that relates to dangerous failures: 1. Calculate the failure rate for dangerous failures by taking the remaining 40% of the total failure rate: - Dangerous failure rate = Total failure rate x (1 - Safe failure mode split) - = 1.2 x 10^-6 f/hr x 0.40 (which represents the dangerous failures) - = 4.8 x 10^-7 f/hr. Now, since we want the dangerous undetected failure rate, we take the dangerous failure rate and further split it based on the undetected failure assumption. However, in this case, there is typically an assumption that the undetected

To determine the dangerous undetected failure rate for the pressure transmitter, you first need to understand the total failure rate and the safe failure mode split.

The total failure rate is given as 1.2 x 10^-6 failures per hour. The safe failure mode split indicates what proportion of failures are considered safe, which in this case is 60%. This means that 60% of all possible failures are deemed safe, while the remaining 40% can lead to dangerous undetected failures.

To find the dangerous undetected failure rate, you first calculate the proportion of the total failure rate that relates to dangerous failures:

1. Calculate the failure rate for dangerous failures by taking the remaining 40% of the total failure rate:

• Dangerous failure rate = Total failure rate x (1 - Safe failure mode split)

• = 1.2 x 10^-6 f/hr x 0.40 (which represents the dangerous failures)

• = 4.8 x 10^-7 f/hr.

Now, since we want the dangerous undetected failure rate, we take the dangerous failure rate and further split it based on the undetected failure assumption. However, in this case, there is typically an assumption that the undetected