A guide to Hazardous Storage

The Control of Substances Hazardous to Health (COSHH) Regulations 2002, places an obligation on employers to ensure any chemicals and dangerous substances used on the premises are stored and handled in a way that reduces the risks from spills and misuse both to the environment and to those in contact with the substances. What follows are some key actions and provisions you can adopt to ensure you comply with the legislation.

A risk assessment of your site and working practices is the starting point to identify any dangerous chemicals and substances and then to ensure their safe containment, take steps to protect employees from harm and prevent leakage into the environment.

Always read and follow the safe use, storage and disposal instructions on the product label. If you purchase a product that is classified as hazardous, it will be marked with an appropriate haz-chem label and come with a Safety Data Sheet (SDS). An SDS describes the hazards the chemical presents and will give you information on safe handling, storage and emergency measures in case of accident.

Guide to Chemical Incompatibility by Hazard Class

Always store chemical based products in their original containers so that you can read the label for directions on their use, storage and disposal. If you have to transfer hazardous product to other containers such as dispense bottles clearly mark the container with the contents and return to safe storage after use. Never transfer flammable liquids, pesticides or toxic cleaning products to soft drink bottles, uncapped jugs or food containers. Even adults, may mistake them for something to eat or drink.

Store flammable products outside the workspace in locked flammable cabinets or a purpose built fuel store and well away from heat and sources of ignition. Site chemical and fuel storage tanks as far away from water courses, drains and dykes as possible and install bunds to contain leakage.

Only hold sufficient stock of hazardous substances within the workplace necessary for the job in hand. Use COSHH approved flammable storage cabinets or flammable liquid storage containers (with secure lids) to store flammable and combustible liquids not exceeding 50 litres in any one work room.

Never store pesticides or other hazardous products in cabinets or fridges where food is stored. Ideally pesticides should be stored in lockable pesticide cabinets. Toxic and biological hazards should preferably be stored in secure fire proof cabinets to BS EN14470-1 and BS EN14470-2 British Standards with integral ventilation systems

Store inorganic acids in COSHH Chemical Storage Cabinets that have corrosion resistant interiors and door hardware. Flammable storage cabinets are not corrosion resistant and should not be used for inorganic acid storage. All COSHH rated cabinets have secondary containment in the form of spill trays or sumps to contain leaks and spills.

As a general rule store any hazardous substances away from sources of heat and direct sunlight. Heat and sunlight may impact and degrade chemical properties, ignite combustible vapours, deteriorate storage containers and fade labels making identification difficult.

When using hazardous substances ensure air ventilation to the workspace is adequate and operators are equipped with personal protective equipment e.g. masks, goggles and gloves, appropriate to the hazard.

Never mix different cleaning chemical fluids or pesticides. Chemical reactions can occur creating dangerous gases and in some cases exothermic reactions with the potential to cause fires and explosions.

Always dispose of unwanted chemicals particularly petroleum based products and pesticides responsibly to protect the environment. Do not tip down drains, into drainage dykes, rivers or onto the land.

Segregate incompatible chemicals to prevent accidental mixing of chemicals which can produce toxic gases, combustible vapours and exothermic reactions likely to produce heat, fire or explosions. The chemical compatibility table provides guidance for segregated storage of incompatible chemicals.

Finally have emergency numbers for fire and emergency services and the environmental agency in a convenient place in case of emergency.