10 year old Thai B737-4D7, c/n 25321, HS-TDC, empty center tank "exploded" at the jetway at BKK 03-03-2001. Apparently the CWT pump was left running in an empty tank.
One of the superlative CWT pump fail safe designs can be found in the old Douglas DC-8: The CWT pump is inside the No.2 Main Tank, always inmersed and cooled by its fuel.
