Explosive- Suppressant Foam..... say what? I may be ready to jump straight back into my box, BUT..... what are they talking about foam for? Inhert Gas maybe.... never worked on Hercs so could be wrong, but the Chinook had a cobra fire supression unit...... round fires into self sealing tanks, momentary pressure drop sensed, cobra system fires preventing risk of vapour explosion. Job done!
Can't imagine a can of gap filler in a tank of Jet-A1 would work?
TBK