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 Type	Guideword	Expanders
Natural Hazards	Extreme Weather	Temperature extremes, Waves, Wind, Dust, Flooding, Sandstorms, Ice, Blizzards
	Lightning
	Seismic Activity
	Erosion	Ground slide, Coastal, Riverine
	Subsidence	Ground structure, Foundations, Reservoir depletion
Environmental Impact	Discharges to Air	Flaring, Venting, Fugitive emissions, Energy efficiency
	Discharges to Water	Drainage, Water quality, Waste disposal options
	Discharges to Soil	Drainage, Chemical spillage, Waste disposal options
	Location and Layout	Previous land use, Vulnerable fauna and flora, Visual impact, Local population, Area minimisation
External & 3rd Party Hazards	Sabotage	Internal & external security threats
	Terrorist Activity	Riots, Civil disturbance, Strikes, Military action, Political unrest
	Third Party Activities	Farming, Fishing, Local industry
	Helicopter / Aircraft Crash

Facility Hazards
Hazard Type	Guideword	Expanders
Process Hazards	Process 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
	Flaring	Heat, Ignition source, Location
	Venting	Discharge to atmosphere, Location, Dispersion
	Draining
	Sampling	Operator Error
Accommodation and non-process area hazards	Non Process Fires	Control rooms, Accommodation
	Smoke Ingress	Ingress to safe areas, HVAC shutdown
	Gas Ingress	Ingress to safe areas, HVAC shutdown
	Stacking and storage

Health Hazards
Hazard Type	Guideword	Expanders
Health Hazard	Disease Hazards	Endimec diseases, Infection, Contaminated water / food, Social e.g. HIV
Working environment	Physical	Drinking water, Lighting, Noise
	Temperature	Extreme hot/cold, Ventilation, Guarding
	Atmospheres	Exhaust fumes, Confined spaces

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