NAPHTHA-KEROSENE 12°F GAP
KEROSENE-LIGHT DIESEL 62°F OVERLAP
LIGHT DIESEL-HEAVY DIESEL 169°F OVERLAP
HEAVY DIESEL-VGO 70°F OVERLAP
VGO-VACUUM BOTTOMS 70°F OVERLAP
the flash zone and the tower top. Hash zone pressure is set as the sum of reflux drum pressure and combined pressure drop across condenser and trays above the flash zone. A pressure drop of 5 psi between the flash zone and furnace outlet is generally allowed.
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