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There is a propane storage tank in a backyard of a house, as shown in the Figure 3. A fire accident may occur due to release of propane.

There is a propane storage tank in a backyard of a house, as shown in the Figure 3. A fire accident may occur due to release of propane. As a safety measure, a fire alarm coupled with flammable gas detector is installed. On actuation of alarm appropriate safety measures are planned. It is important to note that alarm and gas detector is ineffective for catastrophic failure of storage vessel.

a)     Calculate the probability of a fire accident using fault tree.

b)     Discuss the safety measures which can apply to reduce the failure probability of initiating events and hence the top event probability?

Initiating event

Rate of occurrence (/month)

Leak from pipeline 1

0.004

Leak from valve 1

0.002

Leak from tank

0.001

Overfilling causing catastrophic failure of the tank

0.0005

Leak from pipeline 2

0.005

Leak from valve 2

0.002

Leak during downloading of propane from tanker

0.008

Gas detector and alarm failed

0.004

Presence of ignition source

0.01

 


Figure 3. The Schematic diagram related to propane storage tank

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