Overpressure

Pressure in a process component in excess of the maximum allowable working pressure.

Leak

Accidental escape of hydrocarbons to the atmosphere.

Liquid Overflow

Discharge of liquid thru gas outlet.

Gas Blowby

Discharge of gas thru a liquid outlet.

Underpressure

Pressure less than design collapse pressure.

Excess Temperature

Temperature above designed component range.

Direct Ignition Source

Exposed surface flame, spark at temperature to ignite combustibles.

Excess Combustible Vapors in the Firing Chamber

Vapors in excess required for normal ignition.

Safety Analysis Table (SAT)

The safety analysis tables are applicable to a component regardless of its position in the process flow.

Safety Analysis Checklist (SAC)

The SAC list the safety devices that would be required to protect each process component if it were viewed as an individual unit with worst probable input and output conditions.

Safety Analysis Function Evaluation (SAFE) Chart

The safe chart is used to relate all sensing devices, SDV’s, shutdown devices, and emergency support systems to their functions.