Page 152 - Applied Process Design For Chemical And Petrochemical Plants Volume II

Distillation 141

GENERAL NOTES
(1) "a" dimension should not bo loss than motol thicknoss on clorod 100th dot#,
and proforablo 1.1 timos motoi thicknoss. IDOW not opply on open tooth slots
if slots are toporing to a top tooth width of 2 times motol thicknoss.1
(2) Dubblo cop I.D. has boon sot os a find dimonsion with tho O.D. of tho cop o
minor vorioblo. This pormits tho us* of o stondard slotting mondrol for various
gouges of moteriol used on o cop with a fixod ID. dimension. Fixing tho cap
I.D. will also maintain a constont insido oroo ond its relotionship to onnulor
aroo.
(3) Riwr O.D. hos boon sot os a fixed dimonsion to provont disturbing bolonco bo-
twoon risor oroo ond annular oroo and allow oaso of fitting of risors to dock
soctions irrospoctivo of motol thicknoss used on rison. This is important prin-
cipally on "pull-up" risor insortod through tho deck from bonooth tho tray.
(4) Columns "U, "V" ond "W' am ossumod and estoblishod to giro o cop slot
oroa of opproximototy 1.7 to 1.85 times tho ,isor oroo. Tho six. and shop. of
tho slots hovo boon orbitrorily soloctod so that column "7." could bo colculotod.
Thoso columns oro.of ocodornic intoroat and moy bo of voluo os o comparison
in soloding o slot shop. or moo of groator desirability.
(1) Formulo to find risor I.D. '0" (with a woll thicknoss = tr) when onnulor oroo =
e. Vapor uptake aroo. + = any dasirod rotio of vopor uptake area to annulor
area. (1 = b El

VAPOk RlSm SU€ IO1 AN A??ROXlMIT€ VALUP CA? SPAClNO I A 1 IOR AN A??ROXIMAT€
Or ANNULAR (OR R€VERSAL) UTA = RlSiR WAWR 'MU€ OF R€€ S?AC€ AR€A = 1.0 : AR€A RlS€R #1
OR 1.4 : ARU RlSU #l

1; ;++.-ag
--
41707 __
936
- - SQlbS-
8811 41711 U 179
8 13 37 112 38 485
~
763 3192 33 113
731 294b5 3068
7 03 17 I1 28 17%
671 2485 15967
644 21 691 13 758
617 10619 11648
584 18665 I9615
558 168 17711
531 15033 15904
498 13 164 14186
471 11793 11566
44s 10111 1105
411
- 894x Pblll
384- - 7WW 8 E
.
357 64918 7OM6
35 54119 5235
315 44.301 49Wi
171 3 $466 39761
1.31 27611 3 1414
Ill 1.0739 1.4051
1.7U 1.4849 1.7671
1.51 .W4 11171
1.19 ,6013 .78S4
Figure 8-88. Bubble cap and riser comparison data. Used by permission, Glitsch, Inc.