Foam water sprinkler

Designing a foam fire suppression system requires special expertise

Low Expansion Foam

Low Expansion foam offers a 5:1 expansion rate, making it the foam system of choice to protect large and hazardous facilities, including; petro-chemical tank farms, loading docks, processing areas and refineries and liquefied natural gas storage.

High Expansion Foam

With an expansion rate of 500:1, High Expansion foam systems are more suitable to protect less common three-dimensional hazardous facilities including; warehouses, conveyors, aircraft hangars and tunnels. As such, High Expansion foam is measured by volume output rather than application rate, as is typical of low expansion foams.

Discharge Devices

With both low and high expansion foam systems, once a facility has been evaluated either an ‘Aspirating’ or ‘Non-Aspirating’ discharge device’ will be recommended, based on the facilities requirements.

  • Aspirating discharge devices – produces a more viscous foam – great for reducing burn back and keeping the foam contained.
  • Non-aspirating discharge devices – are best used where the foam is needed to spread over a large area. Talk to a Wormald specialist about your situation.


For maximum effectiveness it is critical the expansion ratio, discharge device and foam concentrate be correct. With our knowledge and expertise, We can recommend the most appropriate devices for your situation.