Contractors Unlimited

HAZID - HAzard IDentification Studies

The HAZID study is carried out by a team of competent engineers from a mixture of disciplines and is led by a person who is experienced in the techniques of HAZID studies. The study leader is often referred to as the HAZID Chairman.
Each area of the installation (or modification in the case of brownfield work) is considered against a checklist of hazards. Where it is agreed by the participants that a hazard exists in a particular area, the risk presented by the hazard is considered, and all possible means of either eliminating the hazard or controlling the risk and/or the necessity for further study are noted on a HAZID worksheet. Actions are assigned to either discipline groups or individuals to ensure the mitigating control, or further study is completed.
 

Hazards

Hazards are any operation that could possibly cause a release of toxic, flammable or explosive chemicals (including oil and gas) or any action that could result in injury to personnel or harm to the environment.
 
The Hazid checklists below give a good idea of the typical hazards that can be considered.
More hazards should be added at the discretion of the HAZID Chairman if the lists do not cover all the potential hazards on the installation under review.
 
External and Environmental Hazards
Hazard TypeGuidewordExpanders
Natural Hazards Extreme WeatherTemperature extremes,
Waves,
Wind,
Dust,
Flooding,
Sandstorms,
Ice,
Blizzards
Lightning 
Seismic Activity 
ErosionGround slide,
Coastal,
Riverine
SubsidenceGround structure,
Foundations,
Reservoir depletion
Environmental ImpactDischarges to AirFlaring,
Venting,
Fugitive emissions,
Energy efficiency
Discharges to WaterDrainage,
Water quality,
Waste disposal options
Discharges to SoilDrainage,
Chemical spillage,
Waste disposal options
Location and LayoutPrevious land use,
Vulnerable fauna and flora,
Visual impact,
Local population,
Area minimisation
External & 3rd Party HazardsSabotageInternal & external
security threats
Terrorist ActivityRiots,
Civil disturbance,
Strikes,
Military action,
Political unrest
Third Party ActivitiesFarming,
Fishing,
Local industry
Helicopter / Aircraft Crash 

 
Facility Hazards
Hazard TypeGuidewordExpanders
Process HazardsProcess Releases
- Unignited
Gas clouds,
Gas detection,
Emergency response
Process releases
- Ignited
Fire,
Explosion,
Heat,
Smoke,
Fire detection,
Emergency response
Process releases
- toxic
H2S detection,
Emergency response
FlaringHeat,
Ignition source,
Location
VentingDischarge to atmosphere,
Location,
Dispersion
Draining 
SamplingOperator Error
Accommodation and non-process area hazardsNon Process FiresControl rooms,
Accommodation
Smoke IngressIngress to safe areas,
HVAC shutdown
Gas IngressIngress to safe areas,
HVAC shutdown
Stacking and storage 

 
Health Hazards
Hazard TypeGuidewordExpanders
Health HazardDisease HazardsEndimec diseases,
Infection,
Contaminated water / fodd,
Social e.g. HIV
Working environmentPhysicalDrinking water,
Lighting,
Noise
TemperatureExtreme hot/cold,
Ventilation,
Guarding
AtmospheresExhaust fumes,
Confined spaces

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