Use of subsurface foam injection on covered IFR tank

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princessme
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According to NFPA 11, subsurface foam injection can't be used on IFR tanks with fixed/covered roof. However, this has been done for a long time by various companies and there doesn't seem to be any issues with that. Can anyone give their opinion based on knowledge/experience why this should not be done? Thanks.
 
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princessme said:
subsurface foam injection
This is foam injection as part of the actual firefighting?