What are the key steps in the demolition and decommissioning of legacy AFFF systems?

The process starts with a detailed assessment of the area surrounding the AFFF tanks. Engineering teams inspect tank conditions, look for leftover foam and identify obstacles such as narrow doorways or low ceilings that make it difficult to remove what is left inside.

Clearing unrelated materials from the work zone helps reduce potential obstruction once decommissioning begins. 

After the initial assessment, staging areas are established with sufficient space to accommodate frac tanks or totes, pipe-cutting and processing zones. These areas include appropriate containment measures, personal protective equipment (PPE) and engineered controls for hotwork  tasks.

Proper preparation supports safe and efficient workflow throughout the demolition phase. This includes:

• Level surfaces for lifts
• Fall protection
• Equipment for lowering and transporting decommissioned pipes

Before any physical removal occurs, the AFFF system is depressurised and pumps are disconnected. This isolation step creates safe working conditions and prevents unexpected discharge during demolition.

Bulk AFFF is vacuumed out of the tank first, followed by line flushing. This requires adequate pump capacity, containerisation of liquids, separate containers for clean water and wash water, and use of defoamer additives to manage foam generation.

Throughout the process, PPE standards are maintained. Temporary fire suppression controls may also be required including removing flammable items and implementing alternate fire safety measures.

When installations are carried out properly, they often go unnoticed, which is a positive outcome. Smooth transitions that don’t disrupt site activities usually involve careful planning before starting, regular communication with everyone involved and flexible plans to manage any risks that arise.

When the legacy system has been fully removed, teams document all activities and prepare the area for the installation and commissioning of replacement systems. A wellmanaged  demolition process reduces rework, minimises delays and creates a stable foundation for future fire protection infrastructure.