Exam (elaborations)
NEBOSH HSE PSM QUESTIONS AND ANSWERS 2024
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NEBOSH HSE PSM QUESTIONS AND ANSWERS 2024
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NEBOSH HSE PSMTypes of static charges - ANSWERS-Spark discharges.
Corona.
Brush.
Propagating brush.
Conical pile (Maurer).
Streaming current charge.
Typical uses of Inert Gases (chemically inactive gases): - ANSWERS-Inerting
equipment to prevent flammable atmospheres.
Preparing equipment for maintenance by purging out hydrocarbons.
Removing air/oxygen in equipment before start-up.
Blanketing tanks to prevent the ingress of air to avoid flammable atmospheres in
the headspace.
Pressure control blanketing-nitrogen introduced into the tank headspace to
maintain a set pressure.
Certain welding operations.
Decommissioning equipment to prevent the rusting process.
Instrument air backup.
Use of Inert gases as fire fighting agents - ANSWERS-Typically CO2 is used for this
purpose in domestic and office areas and on some plant. For major industrial use
,and process plants, a mixture of gases may be preferred. A typical mixture is 52%
nitrogen, 40% argon, 8% carbon dioxide.
Types of tanks used to store liquids - ANSWERS-Fixed-roof tanks (atmospheric
tanks).
External floating roof tanks.
Internal floating roof tanks.
Domed external floating roof tanks.
Horizontal tanks.
Pressure tanks.
Variable vapour space tanks.
Liquified Natural Gas (LNG) tanks.
Creep - ANSWERS-Describes the gradual extension of material under a steady
tensile stress over a long period of time, particularly in high temperatura
conditions.
Stress - ANSWERS-Refers to the tensile or compressive loading placed on the
material. (Stress corrosión and hydrogen embrittlement).
Thermal Shock - ANSWERS-Results form exposing materials to rapid and extreme
temperatura changes.
, Brittle Fracture - ANSWERS-Occur suddenly when the material is put under
excesive stress and has no, or limited, elasticity.
Fatigue Failure - ANSWERS-Fatigue is the formation of cracks as a result of
repeated application of loads that individually do not create sufficient stress to
cause failure:
Thermal fatigue.
Contact fatigue.
Surface or pitting fatigue.
Subsurface cracking or subsurface fatigue.
Corrosion fatigue.
Protection of Tanks from Extremes of Weather - ANSWERS-Tanks may need to be
protected from extremes of weather. In both hot and cold climates, the tank will
be exposed to wide variations in temperature. If this is assessed as an issue, the
tank can be insulated. High wind loadings may also affect the tank by causing
distortions and uplifting from the base.
Distortion can be limited by girding the tank with metal bands.
Trace heating may need to be provided on pipework for some materials.
The Triangle of Fire: - ANSWERS-Heat.
Oxygen.
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