than the outside diameter of the pipe in another aspect of the invention at least one of the nozzles is provided with a beveled tip in still another aspect of the invention at least one of the nozzles is provided with a baffle on its tip application_number US 57682184 A description with reference to fig1 one type of fluid catalytic cracking unit fccu 2 comprises a riser reactor 4 a regenerator 6 a catalyst product separation zone or disengager 8 which usually contains several cyclone separators and a stripping section or zone 10 in which gas usually steam such as introduced from line 12 strips entrained hydrocarbon from the coked catalyst overhead product from the separation zone 8 is conveyed via line 14 to a separation zone 16 including a main fractionator 17 the product can be separated for example as follows light hydrocarbons uncondensed in condenser 21 can be withdrawn from the zone 16 by the line 18 gasoline range liquids accumulated in accumulator 23 can be withdrawn by the line 20 or refluxed via line 27 distillates such as light cycle oils can be withdrawn by the line 22 from stripper 29 after being stripped with steam introduced via line 31 the overhead of.