POM Abnormal Situation 1/2

What is an abnormal situation in a plant operation?

• A situation that requires immediate action to prevent serious consequences

• A situation that requires routine maintenance

• A situation that leads to increased production

• A situation that does not impact the operation

Why are control systems limited in diagnosing and correcting process problems?

• They are not reliable

• They are not connected to the equipment

• They provide detailed root cause analysis

• They have wide limits to avoid false alarms

What are the impacts of abnormal situations in plant operations?

• Increased production, cost savings, improved efficiency

• Off-specification production, wastes, equipment damage, safety problems

• No impact on the operation

• Environmental benefits, reduced insurance premiums

What are some situations that can initiate a process unit shutdown?

• Serious and uncontrollable leakage of a toxic or flammable material

• Failure of individual instruments with bypass options

• Momentary failure of any utility

• Failure of equipment with installed spare unit

What should be done in response to an electric power failure in a plant?

• Shut down the unit according to emergency procedure

• Ignore the power failure

• Increase production speed

• Continue normal operations

How can cooling water failure be managed in a plant?

• Continue normal operations, do not make any changes

• Vent to the flare, increase pressure, reduce monitoring

• Increase fuel to fired furnaces, increase process flow, ignore the failure

• Cut back fuel to fired furnaces, shut down reactors, monitor process variables

What is the purpose of emergency lighting in case of an electrical power failure?

• To shut down the unit

• To increase energy consumption

• To signal the start of a power failure

• To provide light in critical locations when power is lost

Why are diesel-driven electric generators important in case of a power failure?

• To increase energy consumption

• To provide power to run critical equipment for safe shutdown

• To signal the power failure

• To reduce the impact of the failure

What should be done if a total and sustained cooling water failure occurs?

• Cut back fuel to fired furnaces, shut down reactors, monitor process variables

• Continue normal operations, do not make any changes

• Increase fuel to fired furnaces, increase process flow, ignore the failure

• Vent to the flare, increase pressure, reduce monitoring

Why is it important to continually monitor process variables during a cooling water failure?

• To reduce the impact of the failure

• To increase energy consumption

• To signal the failure

• To ensure safe shutdown and prevent excessive pressure increases