NEBOSH STANDARD EXAMS ANSWERS AND
QUESTIONS SET A+
✔✔Identify the hazardous properties of Liquid Petroleum Gas (LPG). - ✔✔hazardous
properties of Liquid Petroleum Gas - LPG
Heavier than air
Vaporisation - Cold
Storage - Leaks
Fire / Explosion
✔✔Outline the risks associated with Liquid Petroleum gas LPG. - ✔✔Risks associated
with Liquid Petroleum gas LPG.
Asphyxiation
Burns (Hot and Cold)
Fire / Explosion
✔✔Outline the following failure modes that may lead to loss of hydrocarbon
containment from storage tanks/vessels or pipelines
Creep - ✔✔Creep:
Is slow movement under stress, made more severe with heat for long periods,
especially with increases in temperature approaching melting points.
✔✔Stress corrosion cracking; - ✔✔Stress corrosion:
Occurs under tensile stress and is worse in a corrosive environment at elevated
temperatures.
,✔✔Thermal shock; - ✔✔Thermal shock:
Cracking associated with rapid temperature change with different parts of an object
expanding by different amounts where the stress overcomes the strength of the
materials.
✔✔Brittle fracture. - ✔✔Brittle fracture:
Rapid run of cracks through a stressed material with plastic deformation before failure
caused by such things as repetition of inappropriate heating or pressurising rates
✔✔A large oil company is proposing to build a new oil and gas installation in the North
Sea. The Process Safety Management Team is analysing past incidents and database
records from the Oil and Gas Industry.
Excluding active and passive fire protection systems, outline physical design features of
the platform that would minimise risk to operating personnel in the event of a major
incident - ✔✔Physical design features of an offshore platform that would minimise risk
to operating personnel in the event of a major incident:
Plant separation
Compartmentalisation
Protection of personnel / equipment
Means of escape
Blow out panels
Temporary refuges with communications & control
✔✔An operator is draining a flammable liquid from process pipework to a metal
container. The supervisor is concerned about the possibility of an electrostatic charge
forming and stops this operation until a risk assessment is undertaken.
During this work activity:
Identify factors that influences the generation of the electrostatic charge; - ✔✔Factors
that influences the generation of the electrostatic charge:
Hot Dry Weather
Flow rate,
, Overfilling
Lack of earthing / bonding
Liquid instability
Splash Filling
None Conductivity of materials
Agitation
Filters
Pressure Velocity
✔✔An operator is draining a flammable liquid from process pipework to a metal
container. The supervisor is concerned about the possibility of an electrostatic charge
forming and stops this operation until a risk assessment is undertaken. During this work
activity:
Outline practical ways of minimising the formation of an electrostatic charge. -
✔✔Practical ways of minimising the formation of an electrostatic charge:
Humidification of the atmosphere
Antistatic additives
Reduce flow velocity
Intrinsically safe equipment
Bonding & Grounding of equipment & containers
Avoid splash filling by submerging the fill pipe bellow the liquid level in the container
Increasing the conductance of floors, footwear
✔✔Outline physical design features of an oil and gas installation that would minimize
risk to operating personnel in the event of a major incident - ✔✔Physical design
features of an oil and gas installation that would minimize risk to operating personnel in
the event of a major incident:
Temporary Refuge
Routes to and from the TR
QUESTIONS SET A+
✔✔Identify the hazardous properties of Liquid Petroleum Gas (LPG). - ✔✔hazardous
properties of Liquid Petroleum Gas - LPG
Heavier than air
Vaporisation - Cold
Storage - Leaks
Fire / Explosion
✔✔Outline the risks associated with Liquid Petroleum gas LPG. - ✔✔Risks associated
with Liquid Petroleum gas LPG.
Asphyxiation
Burns (Hot and Cold)
Fire / Explosion
✔✔Outline the following failure modes that may lead to loss of hydrocarbon
containment from storage tanks/vessels or pipelines
Creep - ✔✔Creep:
Is slow movement under stress, made more severe with heat for long periods,
especially with increases in temperature approaching melting points.
✔✔Stress corrosion cracking; - ✔✔Stress corrosion:
Occurs under tensile stress and is worse in a corrosive environment at elevated
temperatures.
,✔✔Thermal shock; - ✔✔Thermal shock:
Cracking associated with rapid temperature change with different parts of an object
expanding by different amounts where the stress overcomes the strength of the
materials.
✔✔Brittle fracture. - ✔✔Brittle fracture:
Rapid run of cracks through a stressed material with plastic deformation before failure
caused by such things as repetition of inappropriate heating or pressurising rates
✔✔A large oil company is proposing to build a new oil and gas installation in the North
Sea. The Process Safety Management Team is analysing past incidents and database
records from the Oil and Gas Industry.
Excluding active and passive fire protection systems, outline physical design features of
the platform that would minimise risk to operating personnel in the event of a major
incident - ✔✔Physical design features of an offshore platform that would minimise risk
to operating personnel in the event of a major incident:
Plant separation
Compartmentalisation
Protection of personnel / equipment
Means of escape
Blow out panels
Temporary refuges with communications & control
✔✔An operator is draining a flammable liquid from process pipework to a metal
container. The supervisor is concerned about the possibility of an electrostatic charge
forming and stops this operation until a risk assessment is undertaken.
During this work activity:
Identify factors that influences the generation of the electrostatic charge; - ✔✔Factors
that influences the generation of the electrostatic charge:
Hot Dry Weather
Flow rate,
, Overfilling
Lack of earthing / bonding
Liquid instability
Splash Filling
None Conductivity of materials
Agitation
Filters
Pressure Velocity
✔✔An operator is draining a flammable liquid from process pipework to a metal
container. The supervisor is concerned about the possibility of an electrostatic charge
forming and stops this operation until a risk assessment is undertaken. During this work
activity:
Outline practical ways of minimising the formation of an electrostatic charge. -
✔✔Practical ways of minimising the formation of an electrostatic charge:
Humidification of the atmosphere
Antistatic additives
Reduce flow velocity
Intrinsically safe equipment
Bonding & Grounding of equipment & containers
Avoid splash filling by submerging the fill pipe bellow the liquid level in the container
Increasing the conductance of floors, footwear
✔✔Outline physical design features of an oil and gas installation that would minimize
risk to operating personnel in the event of a major incident - ✔✔Physical design
features of an oil and gas installation that would minimize risk to operating personnel in
the event of a major incident:
Temporary Refuge
Routes to and from the TR
