Why Facilities Are Replacing AFFF Systems

Traditional AFFF foams contain per- and polyfluoroalkyl substances (PFAS), which are highly persistent chemicals that can accumulate in the environment and groundwater.

Because of this, many jurisdictions are implementing restrictions on:

• Use of PFAS-based foams
• Storage of legacy AFFF concentrate
• Fire training discharges
• Disposal of contaminated firefighting foam

As a result, many facilities are transitioning to fluorine-free foam (F3) or other suppression technologies that do not contain PFAS.

For facility owners, this transition often involves evaluating environmental liability, regulatory compliance, insurance requirements, and long-term fire protection reliability.

Step 1: Evaluate the Existing Fire Protection System

The first step in any AFFF transition project is a comprehensive engineering review of the existing foam system.

A fire protection engineer will typically evaluate:

• Hazards being protected (fuel type, storage configuration, and fire scenarios)
• Foam application densities used in the original design
• Foam proportioning equipment
• Discharge devices such as foam chambers, monitors, and aspirating nozzles
• Hydraulic demand and system capacity

Understanding the original design basis is critical because replacement foams often have different performance characteristics than legacy AFFF concentrates.

Step 2: Identify Applicable Codes, Standards, and Regulations

Facilities considering a foam transition must also evaluate applicable regulatory and industry requirements.

These may include:

• Local and state PFAS restrictions
• Fire code requirements
• Environmental regulations governing PFAS disposal
• Insurance carrier requirements
• Industry standards for foam fire protection

Many facilities are surprised to learn that removal and disposal of legacy foam concentrate can be one of the most complex parts of the project.

Step 3: Select an Appropriate Replacement Foam

Most AFFF replacement projects involve evaluating fluorine-free foams (F3) designed to suppress flammable liquid fires without PFAS chemicals.

However, not all foams perform the same. Selecting the right foam requires evaluating several technical factors, including:

• Compatibility with the protected fuels
• Required application density
• Foam expansion characteristics
• Proportioning percentage (1%, 3%, etc.)
• Third-party listings or approvals

Choosing the correct foam is one of the most important decisions in the transition process.

Step 4: Determine System Compatibility

Many existing foam systems were designed specifically around the properties of AFFF concentrates.

Fluorine-free foams often behave differently and may require modifications to existing equipment.

During the engineering review, the following components are typically evaluated:

• Foam proportioning equipment (bladder tanks, balanced pressure systems, inductors)
• Foam concentrate viscosity compatibility
• Foam discharge devices
• Pump capacity and system hydraulics

Some systems can be converted with minimal modifications, while others require equipment upgrades to maintain effective fire suppression performance.

Step 5: Remove Existing AFFF Concentrate

Once a transition strategy has been developed, the existing foam concentrate must be removed from the system.

This typically includes:

• Draining foam concentrate tanks
• Removing foam concentrate from piping and proportioning equipment
• Collecting legacy foam for proper disposal

Because AFFF concentrates may contain PFAS compounds, disposal must comply with environmental regulations.

Step 6: Clean and Decontaminate the System

One of the most critical steps in the transition process is removing PFAS contamination from the foam system.

AFFF can leave residues on internal surfaces of tanks, piping, pumps, and valves. Simply draining the system is rarely sufficient.

Typical cleaning procedures may include:

• Water flushing
• Chemical cleaning agents
• Multiple rinse cycles
• Collection and disposal of contaminated rinse water

Proper cleaning helps prevent contamination of the new foam concentrate and reduces environmental risk.

Step 7: Install the Replacement Foam and Commission the System

After the system has been cleaned and any equipment modifications have been completed, the replacement foam can be installed.

Commissioning typically includes:

• Proportioning accuracy testing
• Flow testing
• Foam quality evaluation
• System performance documentation

These tests verify that the fire protection system operates as intended.

Step 8: Update Documentation and Train Personnel

Following the transition, facilities should update fire protection documentation and emergency response procedures.

Personnel should also be trained on the characteristics and application methods associated with the new foam system.

This helps ensure the facility maintains effective fire protection during an emergency.

Engineering Expertise Is Critical for AFFF System Conversion

Replacing an AFFF system is a complex engineering project that requires careful evaluation of fire hazards, system hydraulics, foam performance, and environmental requirements.

Depending on the facility, the transition may involve:

• Minor system adjustments
• Equipment modifications
• Complete foam system redesign

Working with an experienced fire protection engineer can help ensure the transition is completed safely, efficiently, and in compliance with applicable codes and regulations.

Need Help Evaluating an AFFF Foam System?

If your facility is evaluating the transition from an AFFF foam system, a professional engineering review can help determine the most cost-effective and compliant approach.

A fire protection engineering assessment can help you:

• Evaluate replacement foam options
• Determine compatibility with existing systems
• Identify required system modifications
• Develop a compliant transition strategy

Early planning can significantly reduce project costs and help ensure your facility maintains reliable fire protection throughout the process.