A method for foreseeing deviations

The incidents listed earlier in this chapter and many others could have been foreseen if the design had been subjected to a hazard and operability study (hazop). This technique allows people to let their imaginations go free and think of all possible ways in which hazards or operating problems might arise. But to reduce the chance that something is missed. 

What will happen if the vessel is drained while a sample is being 

A pipeline for this purpose is one joining two main plant items—for example, we might start with the line leading from the feed tank through the feed pump to the first feed heater. A series of guide words are applied to this line in turn, the words being  

NONE MORE OE LESS OF PART OF MORE THAN OTHER 

for example, means no forward flow or reverse flow when there should be forward flow. We ask  

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