DakMan
If HP upstream is problematic for tube failure, why did GE choose the design? The Fuel as heating fluid may not be GE's strong suit, but it's HP design. Again, the Fuel does not gain much Heat, it wasn't the design issue. The idea would be to Heat the first place Ice forms, which is not the FOHE. As a final fix, if it is the FOHE that is to remediate the Icing problem Plug, it's the same as accepting the presence of Pipe Ice. As a final fix, that is ludicrous, for reasons stated above.
AF