Cardinal Rules
Always avoid or carefully control draining/venting of ______ to the atmosphere
What is Hydrocarbons?
Operating Procedures exist and are followed for the following phases of the process unit operations including
What is:
Normal Operations
Start up / Shut Down
Emergency Shut Down
A ____shall be reported if a draining/venting activity results in personnel being exposed to a flammable vapor cloud or there is any uncontrolled release of hydrocarbons to atmosphere.
What is a PSNM?
Never allow hydrocarbons to ____ with air inside the process
What is mix?
Metals that have lost their ductility (i.e. pliability) due to being exposed to temperatures below their Minimum Design Metal Temperature (i.e. MDMT Excursion).
What is a brittle metal?
A list of flammable liquids commonly found in Dow Hydrocarbon plants are, but are not limited to:
What is Pygas, Naphtha, C5's, fuel oil, dimethyl sulfide?
Never exceed the established time limit for ___ ____ operation of C3/C4 towers
What is total refulx?
NEVER _____ a process system suspected of falling below its minimum design temperature.
What is re-pressurize?
Always use different ____ connectors for air and nitrogen utility hoses to prevent accidentally introducing air into a process system.
What is hose?
Always respond to overfiring condition by slowly reducing ____ and keeping ___ constant
What is fuel and What is air?
One of these following (3) elements are required for a brittle fracture to occur:
Never depressure process equipment below operating _____ without first removing all C4 and lighter hydrocarbon liquids.
What is pressure?
For C4 and lighter hydrocarbons, always drain liquid before ____ , and ____ before adding liquid?
What is depressurizing and what is pressuring?
•Process systems and vessels that have the potential for exceeding their nameplate MDMT should have _____to warn of a MDMT excursion (in other words, warn before an excursion occurs).
What are alarms?
Never ___ liquid full ___ piping/equipment due to ____ .
What is isolate, hydrocarbon, thermal expansion?