In a process plant, flammable gas that is accidentally released can be detected by an automatic gas detection system or by a process operator working in the area. The process operator can only detect gas if she is present in the area where the gas is released. There are several operators working in the plant,…

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NORSOK Standard S-001 contains a description of the most important barriers/barrier systems on offshore installations in Norway (Section 5 through 24). The most important hazardous events that these barriers shall protect against are the following: Releases of oil/gas from the process plant. Releases of oil/gas from risers and pipelines. Releases of oil/gas from storage. Releases…

In a gas processing plant, releases of flammable gas may occur and early detection is important. There is an automatic gas detection system, but in addition, the gas release may be detected by two operators working in the area. The following information is provided: Each operator spends 30% of her time in the area and…

a task analysis was performed for fixing your bicycle. Perform a SHERPA analysis of some of the tasks required to do this. The worksheet in Figure 15.6 may be used, but you may delimit the analysis to cover only the first six columns in the worksheet. it is stated that operators typically are assumed to…

Different aspects of risk are considered. In a shipping company, the following situations arise: New regulations are introduced that imply stricter requirements to life-saving equipment on ships (e.g. lifeboats, liferafts, survival suits). This applies to all new ships that are being built. The company has recently received two new-built ships and put these into operation.…

Consider the hazardous event “Fire in apartment building.” The fire department in a large city is concerned about the risk associated with this event and are trying to identify risk indicators that can help them to monitor trends in risk. Suggest some relevant indicators. The fire department in Problem 16.3 wants to distinguish between leading…

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Provide examples of aleatory and epistemic uncertainty. Assume that you have thrown a die and that the die is still hidden by a cup. What type(s) of uncertainty is (are) associated with the outcome of the trial? Provide examples of aleatory and epistemic uncertainty. Assume that you have thrown a die and that the die…

In a process plant, leaks of flammable liquid may occur from various equipment. The temperature and pressure of the liquid varies through the plant. In a risk analysis, leaks have been included as a hazardous event. Three leak sizes have been defined, small, medium, and large, and event trees have been developed for these three…