NEBOSH TEST PAPER ANSWERS AND QUESTIONS
SET A+
✔✔Following an annual shutdown of a process plant
Outline the operational control measures that could minimise the risk of an incident
before filling equipment in preparation for start-up - ✔✔Control system - process
controls intelligent alarms
Suitable procedures and methods
Trained and competent employees
Suitable supervision of the operation
Detection systems- flow/ no flow/ overflow
Zone controls
Use of flares / over flow / over pressure devices
Maintenance and integrity of systems
Management of overrides
✔✔Identify THREE properties of Hydrogen Sulphide - H2S - ✔✔THREE properties of
Hydrogen Sulphide - H2S
Highly toxic
Flammable gas
Heavier than air and hence tends to accumulate in low-lying areas
Pungent, smells like rotten eggs but rapidly destroys the sense of smell
, ✔✔On an oil processing plant outline how activation of an H2S detection system, linked
to a control room, could prevent a fire. - ✔✔H2s is a flammable gas, detectors can be
used to trigger alarms, control room operators can implement process control
measures, emergency procedures, shutdowns or evacuations, activate fire protection
systems, and shut down any sources of ignition remotely.
This can provide an early warning of a problem and help to ensure people's safety
✔✔A worker has requested a permit-to-work in order to replace damaged thermal
insulation in an overhead pipe rack that runs between two plants.
Identify THREE hazards associated with this activity - ✔✔Working at height
SIMOPS
✔✔A worker has requested a permit-to-work in order to replace damaged thermal
insulation in an overhead pipe rack that runs between two plants
Outline control measures that should be implemented to reduce the risks to the worker -
✔✔Risk assessment/JSA for job
PTW communicated to and posted in adjacent plant
Close communication between adjacent plants
Individual Fall Protection
✔✔Why are accident investigations carried out - ✔✔To identify the immediate root
causes of the incident - incidents are usually caused by unsafe acts and unsafe
conditions in the workplace, but these often arise from underlying root causes.
To identify corrective actions that will prevent a recurrence - The main reason for
investigating
✔✔What are the four steps in the investigation process - ✔✔Step 1: Gather factual
information about the event.
Step 2: Analyse that information and draw conclusions about the immediate and root
causes.
Step 3: Identify suitable corrective measures.
Step 4: Plan the remedial actions.
SET A+
✔✔Following an annual shutdown of a process plant
Outline the operational control measures that could minimise the risk of an incident
before filling equipment in preparation for start-up - ✔✔Control system - process
controls intelligent alarms
Suitable procedures and methods
Trained and competent employees
Suitable supervision of the operation
Detection systems- flow/ no flow/ overflow
Zone controls
Use of flares / over flow / over pressure devices
Maintenance and integrity of systems
Management of overrides
✔✔Identify THREE properties of Hydrogen Sulphide - H2S - ✔✔THREE properties of
Hydrogen Sulphide - H2S
Highly toxic
Flammable gas
Heavier than air and hence tends to accumulate in low-lying areas
Pungent, smells like rotten eggs but rapidly destroys the sense of smell
, ✔✔On an oil processing plant outline how activation of an H2S detection system, linked
to a control room, could prevent a fire. - ✔✔H2s is a flammable gas, detectors can be
used to trigger alarms, control room operators can implement process control
measures, emergency procedures, shutdowns or evacuations, activate fire protection
systems, and shut down any sources of ignition remotely.
This can provide an early warning of a problem and help to ensure people's safety
✔✔A worker has requested a permit-to-work in order to replace damaged thermal
insulation in an overhead pipe rack that runs between two plants.
Identify THREE hazards associated with this activity - ✔✔Working at height
SIMOPS
✔✔A worker has requested a permit-to-work in order to replace damaged thermal
insulation in an overhead pipe rack that runs between two plants
Outline control measures that should be implemented to reduce the risks to the worker -
✔✔Risk assessment/JSA for job
PTW communicated to and posted in adjacent plant
Close communication between adjacent plants
Individual Fall Protection
✔✔Why are accident investigations carried out - ✔✔To identify the immediate root
causes of the incident - incidents are usually caused by unsafe acts and unsafe
conditions in the workplace, but these often arise from underlying root causes.
To identify corrective actions that will prevent a recurrence - The main reason for
investigating
✔✔What are the four steps in the investigation process - ✔✔Step 1: Gather factual
information about the event.
Step 2: Analyse that information and draw conclusions about the immediate and root
causes.
Step 3: Identify suitable corrective measures.
Step 4: Plan the remedial actions.
