Double Jeopardy

[shahyar]

Based on "Double Jeopardy", I can say: "There is no car accident can happen in this village/city/mega city at the same time".

Is that correct?!

 

[MortenA]

No but you can say that a car accident (with any number of cars) will not coincide with an airplane crashing into the same site.

E.g. your case for PSV sizing for a given vessel is blocked outlet - but you dont consider that the vessel eventually will fill up and then include two phase outlet. Here you assume that the LAHH will shut down the inlet.

Best regards

Best regards

Morten

 

[MortenA]

Hmm maybe my answer was incorrect

I would like to rephrase it to:

No auto accident could occur at the same time - at a given site - that would change the direct outcome of any other car accident happening. But the double jeporady rule does not mean that you dont have to consider how many accident can occur within a given time frame when you try to estimate the number of hospital beds/emergency response capacity etc. required.

Best regards

Morten

 

[ggordil]

I think that "double jeopardy" means that it is highly unlikely that two unrelated events will happen at the same time, in the same system, both causing the same outcome.

For example, a blocked outlet downstream and an inadvertent valve opening upstream, both would overpressure the vessel, at the same time.

It is possible to have scenarios where it may seem like double jeopardy but are not.

An example of this is blocking in the cold side of a heat exchanger while leaving the hot side in service. It takes the closing of two valves, but only one error in the operator’s mind (leaving the hot side in service).

So, I would say, two car accidents happening at the same intersection at the same time, independent of each other, causing the nearest hospital to not have enough hospital beds for all the victims.

 

[djack77494]

Rememer the 1st picture MortenA painted. A plane crashing at a particular intersection could quite possibly lead to an auto crash at the same intersection. I've noticed a tendency to dismiss as "double jeopardy" many events which really may be related (thought the relationship may not be that obvious). Also, note that in today's ever more safety conscious world, the claim of double jeopardy does not automatically mean that a combination of hazards will not be considered.
Doug

 

[shahyar]

Thank you all. Now I have better understanding of this concept.