NEBOSH COMPREHENSIVE SETS ANSWERS AND
QUESTIONS SET A+
✔✔An employee was seriously injured in an accident at work within an oil and gas
installation.
Identify the documented information that might be used by the investigating team to
determine the causes of this acciden - ✔✔Documented information that might be used
by the investigating team to determine the causes of an accident;
PTW
Photographs
CCTV Footage
Witness Statements
Previous Health and Safety Meeting Minutes
Risk Assessments / JSA's
Method Statements
Control Room Data
Internal incident report forms
Maintenance records
Disciplinary records
Safe systems of work
Audit / inspection reports
,SOP's
D & A Test results
✔✔Outline the term Flash Point - ✔✔Flashpoint is the lowest temperature at which
sufficient vapour is given off to "Flash" - that is, ignite momentarily, and not carry on
burning, when a source of ignition is applied to the vapour.
At the flash point the application of a naked flame gives a momentary flash rather than
sustained combustion, for which the temperature is too low
✔✔Give the meaning of the following term
Upper flammable limit - UFL - ✔✔UFL - The maximum concentration of fuel in air that is
sufficient to allow combustion to occur.
Above the UFL the mixture is too rich to burn
✔✔Give the meaning of the following term
Lower flammable limit LFL - ✔✔LFL - The minimum concentration of fuel in air that is
sufficient to allow combustion to occur.
Bellow the LFL, the mixture is too lean to burn.
✔✔Give the meaning of the following term
Flashpoint - ✔✔Flashpoint is the lowest temperature at which sufficient vapour is given
off to "Flash" - that is, ignite momentarily, and not carry on burning, when a source of
ignition is applied to the vapour.
✔✔Give the meaning of the following term
Highly flammable liquids - ✔✔Highly flammable liquids
Liquids with a flash point below 32°C.
Substances which, when hot, catch fire in contact with air at ambient temperature
without any energy input
✔✔Identify the information that might be included on a checklist for an investigation
following an accident - ✔✔1. Obtain basic facts:
Names of injured
, Witnesses
Place
Date and time
Persons in area
Ascertain substances / chemicals involved
Injuries
Damage to equipment
2. Establish circumstances:
What happened?
Causes
Events leading to incident
Competence
Supervision
Behavior
3. Preventive Measures - Review the risk assessment for the activity:
What precautions should have been in force?
What training should those carrying out the activity have received?
What precautions were actually taken? Compare them with those which should have
been taken.
What training was actually given? Compare it with training which should have been
given.
4. Was the initial response adequate?:
Firefighting
First aid
Containment and spillage
5. Identify underlying causes:
Management or supervision failure?
Lack of competence?
Inadequate training?
Shortcomings in original design of
Equipment
Facilities
Absence of a system for maintenance.
6. Determine action needed to prevent a recurrence
QUESTIONS SET A+
✔✔An employee was seriously injured in an accident at work within an oil and gas
installation.
Identify the documented information that might be used by the investigating team to
determine the causes of this acciden - ✔✔Documented information that might be used
by the investigating team to determine the causes of an accident;
PTW
Photographs
CCTV Footage
Witness Statements
Previous Health and Safety Meeting Minutes
Risk Assessments / JSA's
Method Statements
Control Room Data
Internal incident report forms
Maintenance records
Disciplinary records
Safe systems of work
Audit / inspection reports
,SOP's
D & A Test results
✔✔Outline the term Flash Point - ✔✔Flashpoint is the lowest temperature at which
sufficient vapour is given off to "Flash" - that is, ignite momentarily, and not carry on
burning, when a source of ignition is applied to the vapour.
At the flash point the application of a naked flame gives a momentary flash rather than
sustained combustion, for which the temperature is too low
✔✔Give the meaning of the following term
Upper flammable limit - UFL - ✔✔UFL - The maximum concentration of fuel in air that is
sufficient to allow combustion to occur.
Above the UFL the mixture is too rich to burn
✔✔Give the meaning of the following term
Lower flammable limit LFL - ✔✔LFL - The minimum concentration of fuel in air that is
sufficient to allow combustion to occur.
Bellow the LFL, the mixture is too lean to burn.
✔✔Give the meaning of the following term
Flashpoint - ✔✔Flashpoint is the lowest temperature at which sufficient vapour is given
off to "Flash" - that is, ignite momentarily, and not carry on burning, when a source of
ignition is applied to the vapour.
✔✔Give the meaning of the following term
Highly flammable liquids - ✔✔Highly flammable liquids
Liquids with a flash point below 32°C.
Substances which, when hot, catch fire in contact with air at ambient temperature
without any energy input
✔✔Identify the information that might be included on a checklist for an investigation
following an accident - ✔✔1. Obtain basic facts:
Names of injured
, Witnesses
Place
Date and time
Persons in area
Ascertain substances / chemicals involved
Injuries
Damage to equipment
2. Establish circumstances:
What happened?
Causes
Events leading to incident
Competence
Supervision
Behavior
3. Preventive Measures - Review the risk assessment for the activity:
What precautions should have been in force?
What training should those carrying out the activity have received?
What precautions were actually taken? Compare them with those which should have
been taken.
What training was actually given? Compare it with training which should have been
given.
4. Was the initial response adequate?:
Firefighting
First aid
Containment and spillage
5. Identify underlying causes:
Management or supervision failure?
Lack of competence?
Inadequate training?
Shortcomings in original design of
Equipment
Facilities
Absence of a system for maintenance.
6. Determine action needed to prevent a recurrence
