Safety Moment #48: What To Do?

Decisions when faced with an emergency

The material shown here has been extracted from the ebook 52 Process Safety Moments and in the book Plant Design and Operations.

In Safety Moments #2: Common Process Hazards — Static Electricity and #7: No One There it was noted that the only way of achieving perfect safety is to remove people from the location of the hazard. We adapt one of Trevor Kletz’s phrases by saying, “If a person’s not there they can’t be killed.”

The value of this saying is illustrated here with two more events. Both were serious — and had the potential to kill the persons involved. Fortunately, there were no injuries in either case.

The Leaking Pump

On a refinery in California a supervisor was walking past a set of two pumps (one was a spare). The materials being pumped was highly flammable. Just as he was going by one of the pumps blew a seal and large vapor cloud formed. The supervisor had, at one time, been in charge of the unit he was walking through, so he knew the equipment very well. But, at the time of the incident, he was working elsewhere; he did not have line authority over the unit in question.

The supervisor was faced with an on-the-spot decision. Should he walk quickly over to the pumps, shut down and block in the leaking pump and start the spare. Doing so would mean that the total amount of material leaked would be minimized and he could keep the unit running with minimal interruption. On the other hand, had the leaking vapor ignited — and there were fired heaters in the vicinity — he would likely have been seriously injured or even killed. The alternative decision was to move away from the situation, then go to the control room and inform the line operators that there was an emergency situation.

The decision he made was to go toward the leaking pump and shut it in. He then went to the control room where the senior operator triggered the refinery alarm systems, and the emergency response team went to the pumps to make sure that there were in fact blocked in and not leaking.

As a result of the supervisor’s action the event was not much more than a minor release and production upset. But the consequences could have been much, much worse. 

The Failed Gasket

At another refinery, this one in Texas, an operator was changing out a filter in a line through which flowed light hydrocarbons. His actions were completely routine — this was an activity that he had done many times before. He installed a new filter cartridge, put a new seal on the top of the filter housing, closed up the filter body and opened the valves around the filter so restart the flow of hydrocarbon liquid.

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Copyright © Ian Sutton. 2018. All Rights Reserved.