Environmental Protection Department

Risk Management of Potentially Hazardous Installations

The government imposes special controls on industrial installations which use hazardous materials in quantities exceeding specified threshold values. These industrial installations are designated as Potentially Hazardous Installations (PHIs) and include liquefied petroleum gas (LPG) and oil terminals, housing estate LPG stores, gas production plants, explosive depots, and chlorine stores at water treatment works.

Risk guidelines have been developed by the government to allow the assessment of individual and societal risks at PHI sites. The societal risk guideline includes the requirement that risk levels should be "as low as reasonably practicable". This requirement has resulted in the implementation of cost-effective risk mitigation strategies including:

provision of plant safety systems, for example, containment and absorption systems have been installed in chlorine stores at water treatment works;
control of residential development near PHIs; and
PHI relocation from urban sites to sites in less populated areas.
Societal Risk Guideline

Societal Risk Guideline
Plant safety improvement works have been progressively implemented and now all non-fuel gas PHIs are within the risk guidelines. However, the risk management of PHI sites is an ongoing process due to changes in plant inventories and population development near PHI sites. In addition to PHI sites, the risk guidelines are now used as assessment criteria under the Environmental Impact Assessment Ordinance for projects which manufacture, store, use or transport dangerous goods.
Locations of Existing PHI Sites

Risk Reduced for Thousands of People


See Data


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User review date: 
Wednesday, 20 March, 2019