US flag products tanker in ballast from Tampa to Port Arthur.
Pump room explosion killed 3 in ER.
Practice was to drain gasoline, etc into PR bilges.
USCG at the time said this was normal.
No vent fan was off.
Ship had a turbine driven air compressor in top of P/R.
This compressor had broken apart.
USCG said flammable mixture pulled into this compressor,
heated up and ignited.
P/R forward bulkhead blown out,
but no mention if any spill.