Most airports stock large supplies of AFFF for hydrocarbon fires. At some military or commercial airport storage tank farms, fire response services may depend upon on-site crash trucks for extinquishment. The various constructed storage tanks, i.e. cone roof, internal or open top floater, require detailed preplanning to ensure expeditious extinquishment. Tank fires usually involve prolonged continuous uninterrupted foam discharge, which may tax the crash truck's inherent capabilities. Tank fire extinguishments are best accomplished with fixed foam systems or specially designed foam trucks.
Aircraft hangar foam systems usually involve overhead closed-head water sprinklers.
Prior to accepting the existing sprinkler head or a replacement, the sprinkler should be listed by UL for the intended service. Not all water sprinklers produce the minimum foam discharge requirements. At best, the listed sprinklers produce a fast draining foam solution. A popular aircraft hangar foam liquid proportioning device involves the Bladder Tank. These systems are effective but must be filled and maintained by professionals.