Page 405 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Ejectors and Mechanical Vacuum Systems 373
- -

1,300 I I I '-- - '--
I
1,000 I I 'uf _ �s90_ -
-
( \-\0 - •
800 ,eo 1t\ 9e�� �- - --
- --
••
4
600 \ S -- _...- - f-'f"" - 1- - -
500 \'f:,t::.· o_....... .,. - ..... ...... -
,_ �(.,)� ./'" ........... � � f-1-"" - - -
:::, 400 -
0 .:'i.?(.,)(.,)b .. ./I,, ............... - .......... � - - - -
...
::c 300 -
- - -
-
,,
'o\J
....
-
.... .... -i-
.....
- -
I,,.........
Cl) l/ v .. ,, '1,<::F:; ..... - - - - - - - - -
-
c. 200 / I/ ,, \, 00 __...... __ i- --· - -
...
1-
,.....-i--,.... - _,..
� ��
Cl)
-
- v / "' � ..,.... , oO"" ,....i., ,.....1-""· '---- - - - - - - - -
l/
-
_,....
:::,
V/ ./'
l/ /
- 100 v � v �/ ./,..... f:JOO u-r - ..... - - - -
�· V ..,....
><
'ooO ........ _,.... .... "i1'L
:E
--
,., ,
�
o.OO
0
en
�
�
-
.Cl 80 ,, / v ., .,,, I/ �oo - -- - -- - -
-
f:JO..,
c 60 / v " ,.... v I,," .,i .... - 2 M - - .. -
v I/ �
-
- 50 v / , ..... 'l.o? - ,.... ..... ....... - - .. ......
v I/ �"
�
.
-
>,. 40 , v v , ,.. ...... ... .. ... - - --
:'!:: \�oo --
-
<..) / / �' :/ ./ - - i
c 30 L,,' .. �· ,..\'?> I - _ .......
i-
......
..... .....
- -
c. l/ / I" ..... - - - "l
-
/
c
- -
,...
u / / / i"' ,ao z's �
-
l/ 1./
20 v / / ....... ,.. L,,' ...... � - - -
-
I v v v / ..... .'i, a-- ' - -
v
..... ......
I l/ ,I " / L,,' ...... L,,' le,'b - I l
v
10 , I/ /
3 4 5 6 7 8 9 10
Ejector Suction Pressure, Inches Hg. Abs.
Figure 6-26A. Size ejector for 20 psig steam consumption, single stages, 3"-1 O" Hg abs. By permission, Worthington Corp.
Water consumption:
1
�200 GPM = 0.06 (131) == 7.85
� 175 l
Ql) \ Use 10 GPM minimum
�
::::ll 150
VJ \ Ejector System Specifications
en
(l.'I 125 Figure 6-29 is helpful in summarizing specifications to
�
a.. \ conclensers to serve a specific process application. Most
the ejector manufacturer for rating of ejectors and inter-
- 100 � conditions require a detailed evaluation with the manu-
E
0
90
G.:l
facturer's test curves, as very few complicated systems
en 80 \ requiring high vacuum can be picked from stock items.
�
- 70 \ The stock items often fit single-stage vacuum require-
Q.;,
ments for process and such standardized situations as
N
N ' � pump priming.
0
z 60 I'\ Figure 6-29 is also adaptable to air and water ejector
. 8 1.0 1.2 applications .
In all cases it is important to describe the system, its
F=Steam Pressure Factor requirements, control and method of operation in the
specifications. The manufacturer needs complete data
Figure 6-268. Steam pressure factor for Figure 6-26A. By permis- concerning the motive steam (air or water) and the con-
sion, Worthington Corp. densable and non-condensable vapors.