6.4.4.2.1.1 Series Model If there is only one equipment in the system and it is required, then the reliability diagram is:

6.4.4.2.1.1 Series Model

If there is only one equipment in the system and it is required, then the reliability diagram is:

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The probability of success for the system is obviously the probability of success of equipment A, or P_{S} = P_{A} (6.20) The probability of A failing would be 1 - P_{A}. For a two equipment serial system the reliability diagram is:

The probability of success for the system is obviously the probability of success of equipment A, or

(6.20)

The probability of A failing would be 1 - P_{A}.

For a two equipment serial system the reliability diagram is:

The probability of success for the system is the probability of success of equipment A and B, or P_{S} = P_{A}P_{B} (6.21) If A and B are identical, then P_{S} = (PA)^{2} (6.22) For a three equipment serial system the reliability diagram is:

The probability of success for the system is the probability of success of equipment A and B, or

P_{S} = P_{A}P_{B} (6.21)

(6.21)

If A and B are identical, then

P_{S} = (PA)^{2} (6.22)

(6.22)

For a three equipment serial system the reliability diagram is:

The probability of success for the system is the probability of success of equipment A, B and C, or P_{S} = P_{A} P_{B} P_{C} (6.23)

The probability of success for the system is the probability of success of equipment A, B and C, or

P_{S} = P_{A} P_{B} P_{C} (6.23)

(6.23)