NEBOSH HSE PSM QUESTIONS AND ANSWERS ALREADY
GRADED A+ SCORE SOLUTION GUARANTEED PASS UPDATED
2025/2026
Remotely Operated Shutoff Valve (ROSOV)
A shutoff valve whose operation can be controlled from a point
which is remote from the valve itself, such as in a Control Room.
Rosovs are mainly used for rapid emergency isolation of vessels,
pipelines and processes during emergencies, such as major
leaks.
Emergency Shut-down (ESD).
This is a safety system designed to operate quickly to minimize
consequences in the event of an emergency.
Definition of FARSI
A model of performance standards for sces, which can be
described in terms of its:
Functionality.
Availability.
Reliability.
Survivability.
Interdependency.
Saturated Steam
,Saturated Steam or Wet Steam is produced at the boiling point of
water, at atmospheric pressure this is equivalent to 100 ⁰C.
Between 3 and 5% of the water may be entrained in the steam.
This reduces heating efficiency and also can create problems for
pipe work and reactor vessels. The condensate has to be
removed as near to the point of use as posible by steam traps.
Superheated Steam
The superheated steam has a temperature higher than its
boilling point (for example 200 ⁰C) and it is more suited to
transfer long distances through pipework. It is an invisible gas
and not readily detected by naked eye.
Vacuum Steam
The vacuum steam is created by reducing the operation pressure
using a vacuum pump, so the steam effectively is below 100 ⁰C.
Steam injected into flare stacks
Injecting steam into fluids atomices the fluid and increases
surface area. In the process industries, the steam is often
injected into flare stacks to improve combustion efficency and
reduce emissions of pollutants.
Legionella Pneumophilia Bacteria
, This bacteria can survive when water temperatures are in the
range over 20 ⁰C and under 55 ⁰C. The ideal growth temperature
for the bacteria is 37 ⁰C (the human body temperature and hence
the risk). As well as causing pneumonia, the bacteria also can
cause a fever (Pontiac fever) that is generally less serious.
Catalysed and Uncatalysed Reaction
A Catalyst is a medium put into a reaction vessel that changes
the pathway (mechanism)of a reaction
So the particles are forced into closer proximity. This increase
the speed of a reaction by lowering the
Activation energy. Catalysts are not destroyed or changed during
a reaction and are generally reusable,
Although they may suffer from poisoning by contamination with
undesaired trace substances in the reaction.
Measures to control and prevent a Run away chemical reaction
Containment within the reactor.
Crash cooling.
Drowning and quenching of reactor contents.
Emergency venting/ dumping of reactants.
Types of static charges
Spark discharges.
GRADED A+ SCORE SOLUTION GUARANTEED PASS UPDATED
2025/2026
Remotely Operated Shutoff Valve (ROSOV)
A shutoff valve whose operation can be controlled from a point
which is remote from the valve itself, such as in a Control Room.
Rosovs are mainly used for rapid emergency isolation of vessels,
pipelines and processes during emergencies, such as major
leaks.
Emergency Shut-down (ESD).
This is a safety system designed to operate quickly to minimize
consequences in the event of an emergency.
Definition of FARSI
A model of performance standards for sces, which can be
described in terms of its:
Functionality.
Availability.
Reliability.
Survivability.
Interdependency.
Saturated Steam
,Saturated Steam or Wet Steam is produced at the boiling point of
water, at atmospheric pressure this is equivalent to 100 ⁰C.
Between 3 and 5% of the water may be entrained in the steam.
This reduces heating efficiency and also can create problems for
pipe work and reactor vessels. The condensate has to be
removed as near to the point of use as posible by steam traps.
Superheated Steam
The superheated steam has a temperature higher than its
boilling point (for example 200 ⁰C) and it is more suited to
transfer long distances through pipework. It is an invisible gas
and not readily detected by naked eye.
Vacuum Steam
The vacuum steam is created by reducing the operation pressure
using a vacuum pump, so the steam effectively is below 100 ⁰C.
Steam injected into flare stacks
Injecting steam into fluids atomices the fluid and increases
surface area. In the process industries, the steam is often
injected into flare stacks to improve combustion efficency and
reduce emissions of pollutants.
Legionella Pneumophilia Bacteria
, This bacteria can survive when water temperatures are in the
range over 20 ⁰C and under 55 ⁰C. The ideal growth temperature
for the bacteria is 37 ⁰C (the human body temperature and hence
the risk). As well as causing pneumonia, the bacteria also can
cause a fever (Pontiac fever) that is generally less serious.
Catalysed and Uncatalysed Reaction
A Catalyst is a medium put into a reaction vessel that changes
the pathway (mechanism)of a reaction
So the particles are forced into closer proximity. This increase
the speed of a reaction by lowering the
Activation energy. Catalysts are not destroyed or changed during
a reaction and are generally reusable,
Although they may suffer from poisoning by contamination with
undesaired trace substances in the reaction.
Measures to control and prevent a Run away chemical reaction
Containment within the reactor.
Crash cooling.
Drowning and quenching of reactor contents.
Emergency venting/ dumping of reactants.
Types of static charges
Spark discharges.
