SENG 680 POST EXAM 2 MATERIAL QUESTIONS AND CORRECT ANSWERS 100% VERIFIED
LATEST UPDATE!!
What changes require an MOC? - (ANSWER)Changes to process chemicals, technology, equipment,
procedures, or facilities that affect a covered process (except replacements in kind).
What must MOC procedures consider before any change? - (ANSWER)Technical basis, safety/health
impact, operating procedure modifications, time period for change, authorization requirements.
Who must be informed and trained before startup after a change? - (ANSWER)Operators, maintenance
employees, affected contract employees.
What must be updated after approved changes? - (ANSWER)PSI (process safety information) and
operating procedures.
What are the key steps in applying MOC written procedures? - (ANSWER)Identify technical basis,
evaluate safety/health impact, list procedure modifications, determine installation/commissioning time.
What are required pre-startup actions under MOC? - (ANSWER)Identify employees/contractors to train,
specify training topics, update PSI, update operating procedures.
When must an incident investigation begin? - (ANSWER)As promptly as possible, but no later than 48
hours after the incident.
What incidents must be investigated? - (ANSWER)Any incident that resulted in, or could reasonably have
resulted in, a catastrophic release of highly hazardous chemicals.
Who must be on the incident investigation team? - (ANSWER)At least one knowledgeable process
person, a contract employee (if contractor work was involved), others with relevant expertise.
What must an incident investigation report include? - (ANSWER)Date of incident, date investigation
began, incident description, contributing factors, recommendations.
, SENG 680 POST EXAM 2 MATERIAL QUESTIONS AND CORRECT ANSWERS 100% VERIFIED
LATEST UPDATE!!
Who must review incident investigation reports? - (ANSWER)All affected personnel with relevant job
roles, including contract employees.
How long must incident investigation reports be retained? - (ANSWER)5 years.
What system must employers establish after an investigation? - (ANSWER)A system to promptly
address, resolve, and document findings and recommendations.
What are the three essential elements of combustion? - (ANSWER)Fuel, oxidizer, ignition source.
What is the difference between fire and explosion? - (ANSWER)Rate of energy release—fire is slow,
explosion is rapid (microseconds).
What is auto-ignition temperature? - (ANSWER)The temperature above which a material ignites without
an external source.
What are flammability limits? - (ANSWER)Range of vapor concentration (LFL-UFL) where combustion
occurs upon ignition.
What is a pool fire? - (ANSWER)Ignited pool of flammable liquid burning across its surface.
What is a jet fire? - (ANSWER)High-velocity, directional flame from pressurized gas/liquid release.
What is a flash fire? - (ANSWER)Rapid, brief ignition of a dispersed vapor cloud.
What is a fireball? - (ANSWER)Rapid combustion of a vapor cloud forming a large spherical flame.
What is heat flux? - (ANSWER)Rate of heat energy transferred per area (kW/m²); used to assess thermal
exposure and safe spacing.
LATEST UPDATE!!
What changes require an MOC? - (ANSWER)Changes to process chemicals, technology, equipment,
procedures, or facilities that affect a covered process (except replacements in kind).
What must MOC procedures consider before any change? - (ANSWER)Technical basis, safety/health
impact, operating procedure modifications, time period for change, authorization requirements.
Who must be informed and trained before startup after a change? - (ANSWER)Operators, maintenance
employees, affected contract employees.
What must be updated after approved changes? - (ANSWER)PSI (process safety information) and
operating procedures.
What are the key steps in applying MOC written procedures? - (ANSWER)Identify technical basis,
evaluate safety/health impact, list procedure modifications, determine installation/commissioning time.
What are required pre-startup actions under MOC? - (ANSWER)Identify employees/contractors to train,
specify training topics, update PSI, update operating procedures.
When must an incident investigation begin? - (ANSWER)As promptly as possible, but no later than 48
hours after the incident.
What incidents must be investigated? - (ANSWER)Any incident that resulted in, or could reasonably have
resulted in, a catastrophic release of highly hazardous chemicals.
Who must be on the incident investigation team? - (ANSWER)At least one knowledgeable process
person, a contract employee (if contractor work was involved), others with relevant expertise.
What must an incident investigation report include? - (ANSWER)Date of incident, date investigation
began, incident description, contributing factors, recommendations.
, SENG 680 POST EXAM 2 MATERIAL QUESTIONS AND CORRECT ANSWERS 100% VERIFIED
LATEST UPDATE!!
Who must review incident investigation reports? - (ANSWER)All affected personnel with relevant job
roles, including contract employees.
How long must incident investigation reports be retained? - (ANSWER)5 years.
What system must employers establish after an investigation? - (ANSWER)A system to promptly
address, resolve, and document findings and recommendations.
What are the three essential elements of combustion? - (ANSWER)Fuel, oxidizer, ignition source.
What is the difference between fire and explosion? - (ANSWER)Rate of energy release—fire is slow,
explosion is rapid (microseconds).
What is auto-ignition temperature? - (ANSWER)The temperature above which a material ignites without
an external source.
What are flammability limits? - (ANSWER)Range of vapor concentration (LFL-UFL) where combustion
occurs upon ignition.
What is a pool fire? - (ANSWER)Ignited pool of flammable liquid burning across its surface.
What is a jet fire? - (ANSWER)High-velocity, directional flame from pressurized gas/liquid release.
What is a flash fire? - (ANSWER)Rapid, brief ignition of a dispersed vapor cloud.
What is a fireball? - (ANSWER)Rapid combustion of a vapor cloud forming a large spherical flame.
What is heat flux? - (ANSWER)Rate of heat energy transferred per area (kW/m²); used to assess thermal
exposure and safe spacing.
