Dept of Chemical Engg, Sos, Engg 8& Tech
B.Tech. VIu Semester, Class Test-I/Mid Sem, Process
25.10.20211
Equipment Desing-ll
Time: Two Hours
MM:10
Note:-1. Use of data book is allowed.
2. This time include the uploading and downloading time.
3. Assume suitable data, if necessary.
1. It is necessary on a new installation to preheat 149,000 1b/hr of 34 API crude oil from 170F to a
temperature of 285°F., coresponding to that of the feed plate of a fractionating tower. There is a utility
33"API gas oil line running
near
the tower at 530°F of
relatively unlimited quantity.
Because the
pumping
cost for cold gas oil is prohibitive, the temperature of the gas oil from the heat exchanger, returning to the
line. should not be less than 300°F.
Available on the site is a 25 in. ID 1-2 exchanger containing 252 tubes 1 in. OD. 13 BWG, 160" long
arranged on a six-pass 1
in. triangular pitch layout. The shell baffles are spaced at 5-in. centers. A pumping
head of 10 psi is allowable on the gas oil line and 15 psi on the feed line. Will the exchanger be acceptable if
cleaned. and if so, what will the fouling factor be? For the gas oil the viscosities are 0.4 centipoise at 530°F
and 0.7 centipoise at 300°F. For the crude oil the viscosities are 0.9 centipoise at 285°F and 2.1 centipoise at
170F. (Interpolate by plotting °F vs. centipoises on logarithmic paper.)
S
34
API
Cude
7oF
oil140aolb/hn ) =) 15Psi phoul dhep
o.1o26 F
28sE
>
19o'F
2.1
h
1o1252
Cp 0.S5
33APT
Shell
Cp
223 °V
l 0 ps
go oil
S3o'F
[CO-2, BTL-2, Marks-20]
300F
O.y<P
-
530'
o.e 300'F
nep
phebsuhe
Tube
Cp 0 64 s3o
4IS F
=0 25 2
1inh, sBu
ootudes
TD 2 inwh
OD
(- 2
1
Pas
Het
&achogo
Cegh L)
t3o)
=
16
P
B-lespauby (8) =sindh
6Pass
Mon, 26 Sept
4:30
PED 2 CT2
Heat Bolance
Tubesie
x 0.SYx(285
49oo0
2s29oo
( l o e Flou
-
holbe)
(
MxO. 64 (S3o 30)
190
mx l7.2
m
=62 8s9.395
b}hh
Tenpenalaa feence (At)
UU
S30'F
AT-As'F
AT
26F AT
-
S
T
lAT, z130
9o'
A
ATT
R
300
24S-130
181.4L+
F
(
S:
2
S
S3o30o
2 8S - 1 0
S3o
- 190
28S -1 o
R
S
2
0.3194 O.
r - o.86S
At
F.Alh -o.86Sx1B1.46?
AE
IS6.168°F> so'
32
Clae lenpehakade
thom
i1
CAade oil (31'API) T
2t5 -(o
ns
Cca )
K e = 0.28
Gros dil (33 APT) - T s
30K
Atc
AEh
o.\S
300 19o
130
TTF (7. T)
-t)
Shell sile (Gas ol)
Flow Aea
ag IDc'B
u Pr
230
Contrdling Pud
.s3
24S
S30 28
+F F (
300
300
=
+0.SS(S30 3oo)=4o4.4S F
222.32s
190+0.4ss2B-19 o)
H A
3* Tbe sile Chada si) » Cds A
Flo
s'*
Ahea
Fhom Table o
a
o.SiS
in
en
tube
- 2S«125 -1) x S
ag
o.1936 t
)a
252 x .SiS
I44 x6
2
PED 2 CT2
Shell sile (6a od)
Mass
H Rd 3s'#t ITLe si le (Cudeod) > CJ8 á
velouby -
6s
Mas velout
62859.3 95
I490o
o.1936
O,1S 62
6s362093. 19 /R°h
Renodds
n
-
t
992010.6s 2
eh
Reynedd'
Ke De 6s
hon Tasle 1o
hon Fy 28
De O-?2inch
o
O: TD
tue- o.3 io indh
J=o.1cp28 F
2.12.! Cp 1
S30-to.6
530
o
285 2 2
O.
o.
-
28S -19o
o.9
.36367
o.sG35*2 42
Ke O.12 x 362013.19
:
o . -2
Re
Qex
15Six 2.
y2
3.60 6S
o.81 x99 2o10.6S2
12
12
3.9606
1.3369
Res
o.-
1.5S CP A ke: 2i es
S 6 3 S c P @ t:4ov.65
:
2. 32S
1S931.90
Ke
1980s 48
6
o.lofi22
aon
i 1
d
Fnon
Fiy
H
S5
2390
PED2 CT2
Shell sile (Gab o)
H& P
3#
(
(GAs
k
Fnon Figy
O.64
: 4o4.Gs °F
Same os
w
T.he sile
(Cude oil)
CA Auá
Fhom i
O.S4
222.325°F
Sane ob la
almost
olna
J= 3.96o 6
136 369
Fhoni
fhon Fig
ko.6 t
4oY.65°F
K 0.09s222. 325
o.S4x 3.360 68 s
0.64 l 3 6 36
O.015
O-0
3.00 2
2.3188
De
ho
ox o.0
hi
sS
x 2.3188 Qs
Aa ds:1
(
Cean OHTC (U)
U
ht
D
oD
81.3686
ho hio_
hio ho
23 O
A
183.Soy\
139.3686
hio
ho
3.00
o,S1l12
o2 12
00
xo.045 x
hig
486383
hi
= 148.638S
-183.So KOS
On,
2b Sept
K PED 2 CT2
Uc
189.3686 X148.638s
83.29? Be«/P
189.368 6+ 48-6385
Suhaue pen lnft, A*
.ohtbe (Ne)
e
()
legth
Totl
o.2618 FIE
Q
=
2S 2
-
tle Pe
Nexlx a''
sujace Anea(A)
A
252
x16 xo.261&.
=
loss.sa%ft
2 Heat Thanshen
Q= U A. Ak
12S29oo
= On
x
lo5s.S 9Lx
1S6.96
5s.S5.By Bt/PeF
Dint fosk (R)
-
RaU - Us
Ra33.234 -SS.8YY
65.24
x ss.8\y
0.00 S8
>
0.0o S
P
ehop
Shell sile (Ga o)
Hk Ad
ay*t Tbe
O Reynold Io
Res
Ke
ikion fackon
Os 2 S
1980s.48
FE0.0oo 28. (Conmehcial pipes)
203
12
Fhon iG 6,
0.93
lo.oChore
-
hon i26
O.Ool%
S
cAs Mus s
Frckion fakor
hom iy 29
Sp9
(Cmdeol)
Reynold ', N.
S931.90b
F
sile
Fhon Fig,
(oTetov.s' SP
S
0.8
e 22 2.325°
(N+1) = 12L
12x16- 38.4
S
3) Shell side prasuhe dcp
3
AP
b e Side paes&he
dhop
F6,+Lxn
s.2 x1o Ds dE
S.22 xloDe s s
2
2
As =0 o018 x(362093.19)
2o95
|A' oooo2 %x(192010.68
x 38.4
5.12x1o(.xo3x
AP 8.256psi <1opsi
A
9.38y PSi
2)x l6x
6
PED 2 CT2
Shell sile (Gab o)
H& As 3#T
TJe sile (Chuda o)
»
CA Ad a
Veloub head
om 2 9
Tube-Side etan pAMuhe los
O.13
144
S
x6x0.13 =3.1Ps
o.8
Tbe sida
A
phossuno kos is -
AP +A
1.38
AP
Desn
Feabtble
+ 3.
13.294 Psi < iS ps