isa view taken along the lines 4 4 of fig2 referring now to fig4 the preferred shape of the weir 24 deviates from a circular shape by having a cut along the horizontal edge 80 and further having rectangular or semicircular cut outs 82 in the bottom edge of the weir the following table i is presented to further illustrate the present invention through assuming some typical initial compositions and conditions for a fractionator reboiler apparatus which is employed as a dubutanizer tower and which could advantageously employ the sludge removal system of the present invention in sections a and b of table i the composition make up flow rate and temperature of the feed stream to the reboiler 16 is illustrated the following sections of table i present calculated material and energy data pertinent to the design of the sludge removal system the reference numerals included in table i refer to the numerals illustrated in the drawing figures table i______________________________________reboiler sludge removal illustration for a debutanizer tower______________________________________a bottoms liquid composition c sub 4 0 5 lv c sub 5 9 8 lv residue 89 7 lv sp gravity 0 73v p 100 u00b0 f 7 1 psiab fractionator bottoms liquid charged to reboiler shell 16 flow rate rate 502 b htemp 302 u00b0.