Segregation is the physical separation of dangerous goods or hazardous chemicals that could create additional risks if they come into contact with each other. It is an important safety principle in chemical warehousing, dangerous goods transport, container packing and other chemical logistics operations.
The purpose of segregation is to prevent incompatible substances from interacting following a leak, spill, packaging failure, fire or other incident. Such interactions can result in fire, explosion, toxic gas formation, violent chemical reactions or excessive heat generation. Effective segregation therefore limits both the probability of an incident and its potential consequences.
How does segregation work?
Segregation can be achieved in different ways depending on the substances, quantities and operation involved. Chemicals may be stored in separate areas, different fire compartments, dedicated cabinets or separate containment systems. In transport, specific separation distances or stowage arrangements may be required.
A common example is the separation of acids and alkalis. Although both may be classified as corrosive substances, mixing them can cause a strong exothermic reaction. Oxidising substances may similarly need to be separated from combustible or flammable materials because they can intensify a fire.
This demonstrates why dangerous goods transport classes should not automatically be treated as a complete chemical compatibility system.
Segregation in transport and storage
Different regulatory frameworks contain their own segregation requirements. The IMDG Code, for example, contains detailed segregation provisions for dangerous goods transported by sea, including terms such as “away from”, “separated from” and “separated by a complete compartment or hold from”.
Chemical warehouse segregation requires a broader assessment. In addition to transport classification, organisations should consider the chemical and physical properties of the substances involved. The Safety Data Sheet (SDS) can provide important information, particularly Section 7 on handling and storage and Section 10 on stability and reactivity.
Storage arrangements should also consider what happens during an emergency. Two incompatible chemicals may normally be stored separately but could still mix if leaking products or contaminated firefighting water enter a common drainage or containment system.
Effective segregation therefore involves more than simply placing different hazard classes on separate shelves. It requires an understanding of chemical compatibility, containment, fire behaviour, drainage and credible incident scenarios. Within chemical logistics, proper segregation is one of the fundamental controls for preventing a relatively small release from developing into a much more serious chemical incident.