bab 3(tugas khusus) perhitungan
TRANSCRIPT
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
TUGAS KHUSUS
METODOLOGI PERHITUNGAN
3.1 Cara Memperoleh Data
Dalam perhitungan efisiensi dari HE, di perlukan sejumlah data.
Data-data tersebut di peroleh dari :
a. Data Lapangan sebagai data primer
b. Studi literature sebagai data sekunder
3.1.1 Data Lapangan
Data ini di dapat langsung dari hasil pengukuran yang dilakukan
dari control room, yang di dapat hasil:
NO Date
Bottom DA-101 Outlet EA-118
ETTI133D ETTI150
1. 20-Aug-13 191.8458977 176.6048233
2. 21-Aug-13 192.1285944 176.8254858
3. 22-Aug-13 192.7052609 177.129027
4. 23-Aug-13 192.8733109 177.441011
5. 24-Aug-13 192.8415139 177.4720217
6. 25-Aug-13 193.6473581 177.7272277
7. 26-Aug-13 194.2574906 179.29253
8. 27-Aug-13 193.6229099 178.6154292
9. 28-Aug-13 193.1598767 176.0200474
10. 29-Aug-13 192.179426 175.9093468
11. 30-Aug-13 192.220696 175.9287474
12 31-Aug-13 193.6552288 176.4493846
13. 1-Sep-13 193.8540245 177.1960117
16Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
14. 2-Sep-13 194.6426592 177.5790495
15. 3-Sep-13 194.1053516 177.3532328
16. 4-Sep-13 194.3319251 177.3571764
17. 5-Sep-13 193.939302 177.3687799
18. 6-Sep-13 193.8655592 177.3158908
19. 7-Sep-13 194.4729774 176.9413144
20. 8-Sep-13 194.9835991 177.2283175
21. 9-Sep-13 195.4738778 177.8143446
22. 10-Sep-13 195.5749058 178.0072069
23. 11-Sep-13 196.1223001 177.8639026
24. 12-Sep-13 195.3964977 177.8543289
25. 13-Sep-13 195.1946456 177.6337016
26. 14-Sep-13 196.0169786 178.0015566
27. 15-Sep-13 194.4055649 177.533692
28. 16-Sep-13 194.6318666 177.8071357
29. 17-Sep-13 195.3161223 177.9829275
30. 18-Sep-13 195.1505024 178.1302873
31. 19-Sep-13 195.0363969 178.0351029
32. 20-Sep-13 195.7956393 178.3534773
33. 21-Sep-13 194.8435544 178.0787542
34. 22-Sep-13 194.512462 177.7502159
35. 23-Sep-13 194.2600814 177.5433576
36. 24-Sep-13 194.6098432 177.4964417
37. 25-Sep-13 193.9432972 177.2990531
38. 26-Sep-13 194.5426402 177.4342047
39. 27-Sep-13 194.6364842 177.4450278
40. 28-Sep-13 194.7488141 177.5584737
41. 29-Sep-13 194.3290625 177.4598029
17Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
42. 30-Sep-13 194.2637939 177.4744851
43. 1-Oct-13 193.9361924 177.5294934
44. 2-Oct-13 193.8909954 177.6372016
45. 3-Oct-13 194.3544986 177.7064287
46. 4-Oct-13 194.3804682 177.4744021
47. 5-Oct-13 193.0874226 176.9359422
48. 6-Oct-13 193.4143887 177.168164
49. 7-Oct-13 193.4884065 177.1093011
50. 8-Oct-13 193.8397098 177.0585053
51. 9-Oct-13 194.3231058 177.0702304
52. 10-Oct-13 194.2151791 177.40222
53. 11-Oct-13 194.0075837 177.2995643
54. 12-Oct-13 192.7355606 176.6729244
55. 13-Oct-13 194.1735071 177.1916635
56. 14-Oct-13 193.0327071 176.4157819
57. 15-Oct-13 193.5609287 176.7645054
58. 16-Oct-13 193.1263521 176.6657996
59. 17-Oct-13 192.5589543 176.4993419
60. 18-Oct-13 193.0577867 176.6586705
61. 19-Oct-13 194.1635764 176.839568
62. 20-Oct-13 195.1504852 177.1448367
63. 21-Oct-13 194.2916091 177.0631955
64. 22-Oct-13 193.8437824 177.0335783
65. 23-Oct-13 193.3838127 176.7326357
66. 24-Oct-13 193.1286631 176.7833223
67. 25-Oct-13 191.8008614 176.0563622
68. 26-Oct-13 189.9991947 174.7389074
69. 27-Oct-13 190.4034743 175.0525274
70. 28-Oct-13 190.1035578 175.0749726
18Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
71. 29-Oct-13 189.6020363 175.1061045
72. 30-Oct-13 189.4892124 175.0795851
73. 31-Oct-13 189.5321025 174.9874869
74. 1-Nov-13 189.5226028 175.0139155
75. 6-Nov-13 189,9927255 174,6942025
76. 7-Nov-13 190,0365195 174,7767932
77. 8-Nov-13 189,7877875 175,1336608
78. 9-Nov-13 189,9615136 175,2226767
79. 10-Nov-13 190,0063477 175,2568734
80. 11-Nov-13 190,2898389 175,2275207
81. 12-Nov-13 190,1044048 175,3739623
82. 13-Nov-13 189,9828091 175,1608521
83. 14-Nov-13 189,887302 174,6817125
84. 15-Nov-13 189,6358417 174,3975418
85. 16-Nov-13 190,5916444 175,5263079
86. 17-Nov-13 190,1320707 175,4298704
87. 18-Nov-13 190,4035349 175,3886098
88. 19-Nov-13 190,5181623 175,339602
89. 20-Nov-13 190,4254272 175,2959906
3.1.2 Data Literatur
Untuk data lain, dapat diperoleh dengan mencarinya di literature.
Seperti konstanta kapasitas panas, viskositas, densitas, konduktivitas
thermal, dan massa molekul.
3.2 Perhitungan
3.2.1 Variabel yang diketahui
No. Diketahui shell Tube
19Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
1. T1 343,04 °F 380,84 °F
2. T2 347,36 °F 353,30 °F
3. Pt 1,25 inch
4. ID 106,29 inch 0,856
5. BWG 15
6. Thk 0,078 inch
7. Buffle 22,8 inch
8. Flow Rate 14.446,40 lb/Hr
Water 882,38 lb/Hr
Steam 145 lb/Hr
9. OD 1 inch
10. L 334,65 inch
11. Nt 5004
3.2.1 Menghitung Heat Balance
Water (shell) : (M . Cp . ∆T) + (M . ∆H )
Q = ( 882,38 x 1,05 x 4,32 ) + ( 882,38 x 258,66 )
= 232.238,88 Btu/hour
Steam (shel) Q’ = ( 145 x 0,6 x 4,32 ) + ( 145 x 258,66 )
= 37.881,54 Btu/hour
20Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
Q1 = Q2
Fluidanya Process water sama quench oil lho
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
Q1 = Q – Q’
= 232.238,88 – 37.881,54
Q1 = 194.357,34 Btu/hour
Quench Oil (tube) : M . Cp . ∆T
Q2 = 14.446,40 x 0,49 x 27,54
Q2 = 194.650,5 Btu/hour
3.2.2 Menghitung Log Mean Temperature Different
No Hot Fluid ( T ) Cold Fluid ( t ) Different
1. 380,84 Higher Temperature ( 0F ) 347,36 33,48
2. 353,30 Lower Temperature ( 0F ) 343,04 10,26
3. 27,54 Different( 0F ) 4,32 23,22
LMTD =
= 19,678 0F
R =
=
= 6,375
S =
21Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
=
= 0,129
FT = 0.99 Kern, Fig 18
∆T LMTD= FT x LMTD
= 0,99 x 19,678
= 19,4810F
3.2.3 Menghitung Tc dan tc
Tc=
=
= 367,05 0F
tc =
=
= 345,2 0F
3.2.4 Menghitung Dirt Factor (Rd)
Cold Fluid : shell side (water) Hot Fluid : tube side (gas)
22Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
as =
=
= 3,36 ft2
a’t = 0.576 inch2 [kern. Table 10]
at =
=
= 2,502 ft2
Gs =
=
= 305,76 lb/hr ft2
Gt =
=
= 5773,94 lb/hr ft2
De = 0,99/12
= 0.0825 ft [kern. Figure 28]
At tc = 345,2 °F
µ = 0.1 x 2.42
= 0,242 lb/ft hr [kern. Figure 14]
D = 0,856/12
= 0,0713 ft [kern. Table 10]
At Tc = 367,05 0F
µ = 0,11 x 2,42
=0,266 lb/ft hr [kern. Figure 14]
Res =
=
= 104,236
Ret =
=
= 1547,676
L/D = 391,13
23Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
jH = 5,2 [kern. Figure 28] jH = 3,1 [kern. Figure 24]
At tc= 345,2 0F
c = 1,05 Btu/lb 0F
k = 0,061 Btu/hr ft2 (0F/ft) [Figure 1]
(cµ/k)1/3 = (1,05 x 0,242/0.061)1/3
= 1,61
At Tc = 367,05 0F
c = 0,49 Btu/lb
k = 0.087 Btu/hr ft2 (0F/ft) [Figure 1]
(cµ/k)1/3 = (0,49 x 0,266/0.087)1/3
= 1,144
ho = jH x x ( )1/3 x ɸs
= 5,2 x x 1,61
= 6,19
hi = jH x x ( )1/3 x ɸt
= 3,1 x x 1,144
= 4,327
tw = tc + x (Tc - tc )
345,2 + x (367,05 – 345,2
= 358,55 0F
= x
= 4,327 x 0,856
= 3,704
24Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
Dibagi OD ya zrul
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
At tw = 358,55 0F
µw = 0.13 x 2.42
=0,314 lb/ft2 hr [kern. Figure 14]
ɸs = ( )0.14
= ( 0,14
= 0,96
At tw = 358,55 0F
µw = 0,15 x 2,42
=0,303 lb/ft2hr[kern.Figure 14]
ɸt = ( )0.14
=
= 0,957
ho = x
= 6,19 x 0,96
= 5,94 Btu/hr ft2 0F
hio = x
= 3,704 x 0,957
= 3,54 Btu/hr ft2 0F
Uc =
=
= 2,21 Btu/hr ft2 0F
a’’ = 0,032 [Kern. Tabel 10 ]
A = Nt x L x a’’
= 5004 x 27,887 x 0,032
= 4552,32 ft2
UD =
25Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
=
= 2,195 Btu/hr ft2 0F
Rd =
=
= 0.0030 hr ft2 0F/Btu
Efisiensi (ɳ)
ɳ = x 100 %
= x100 % =
= 99,321 %
3.2.5 Hasil Perhitungan RD Dari Kondisi lapangan
NO Date
Bottom DA-101 Outlet EA-118
RDETTI133D ETTI150
1. 20-Aug-13 191.8458977 176.60482330,00314
2. 21-Aug-13 192.1285944 176.82548580,00317
3. 22-Aug-13 192.7052609 177.1290270,00318
4. 23-Aug-13 192.8733109 177.4410110,00327
5. 24-Aug-13 192.8415139 177.47202170,00320
6. 25-Aug-13 193.6473581 177.72722770,00322
7. 26-Aug-13 194.2574906 179.292530,00330
8. 27-Aug-13 193.6229099 178.61542920,00332
9. 28-Aug-13 193.1598767 176.02004740,00327
10. 29-Aug-13 192.179426 175.90934680,00325
11. 30-Aug-13 192.220696 175.92874740,00327
12 31-Aug-13 193.6552288 176.44938460,00337
13. 1-Sep-13 193.8540245 177.19601170,00347
26Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
14. 2-Sep-13 194.6426592 177.57904950,00337
15. 3-Sep-13 194.1053516 177.35323280,00322
16. 4-Sep-13 194.3319251 177.35717640,00331
17. 5-Sep-13 193.939302 177.36877990,00331
18. 6-Sep-13 193.8655592 177.31589080,00323
19. 7-Sep-13 194.4729774 176.94131440,00331
20. 8-Sep-13 194.9835991 177.22831750,00325
21. 9-Sep-13 195.4738778 177.81434460,00324
22. 10-Sep-13 195.5749058 178.00720690,00315
23. 11-Sep-13 196.1223001 177.86390260,00321
24. 12-Sep-13 195.3964977 177.85432890,00314
25. 13-Sep-13 195.1946456 177.63370160,00327
26. 14-Sep-13 196.0169786 178.00155660,00377
27. 15-Sep-13 194.4055649 177.5336920,00315
28. 16-Sep-13 194.6318666 177.80713570,00335
29. 17-Sep-13 195.3161223 177.98292750,00316
30. 18-Sep-13 195.1505024 178.13028730,00318
31. 19-Sep-13 195.0363969 178.03510290,00357
32. 20-Sep-13 195.7956393 178.35347730,00341
33. 21-Sep-13 194.8435544 178.07875420,00350
34. 22-Sep-13 194.512462 177.75021590,00313
35. 23-Sep-13 194.2600814 177.54335760,00329
36. 24-Sep-13 194.6098432 177.49644170,00356
37. 25-Sep-13 193.9432972 177.29905310,00330
38. 26-Sep-13 194.5426402 177.43420470,00331
39. 27-Sep-13 194.6364842 177.44502780,00334
40. 28-Sep-13 194.7488141 177.55847370,00371
41. 29-Sep-13 194.3290625 177.45980290,00327
42. 30-Sep-13 194.2637939 177.47448510,00347
27Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
43. 1-Oct-13 193.9361924 177.52949340,00358
44. 2-Oct-13 193.8909954 177.63720160,00377
45. 3-Oct-13 194.3544986 177.70642870,00339
46. 4-Oct-13 194.3804682 177.47440210,00341
47. 5-Oct-13 193.0874226 176.93594220,00358
48. 6-Oct-13 193.4143887 177.1681640,00343
49. 7-Oct-13 193.4884065 177.10930110,00344
50. 8-Oct-13 193.8397098 177.05850530,00344
51. 9-Oct-13 194.3231058 177.07023040,00350
52. 10-Oct-13 194.2151791 177.402220,00361
53. 11-Oct-13 194.0075837 177.29956430,00342
54. 12-Oct-13 192.7355606 176.67292440,00347
55. 13-Oct-13 194.1735071 177.19166350,00361
56. 14-Oct-13 193.0327071 176.41578190,00355
57. 15-Oct-13 193.5609287 176.76450540,00360
58. 16-Oct-13 193.1263521 176.66579960,00351
59. 17-Oct-13 192.5589543 176.49934190,00336
60. 18-Oct-13 193.0577867 176.65867050,00367
61. 19-Oct-13 194.1635764 176.8395680,00351
62. 20-Oct-13 195.1504852 177.14483670,00350
63. 21-Oct-13 194.2916091 177.06319550,00361
64. 22-Oct-13 193.8437824 177.03357830,00353
65. 23-Oct-13 193.3838127 176.73263570,00354
66. 24-Oct-13 193.1286631 176.78332230,00347
67. 25-Oct-13 191.8008614 176.05636220,00358
68. 26-Oct-13 189.9991947 174.73890740,00355
69. 27-Oct-13 190.4034743 175.05252740,00359
70. 28-Oct-13 190.1035578 175.07497260,00357
71. 29-Oct-13 189.6020363 175.10610450,00360
28Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan
PT. Chandra Asri Petrochemical Tbk. ( Ethylene Plant )
BAB III Metodologi Perhitungan
72. 30-Oct-13 189.4892124 175.07958510,00357
73. 31-Oct-13 189.5321025 174.98748690,00359
74. 1-Nov-13 189.5226028 175.01391550,00359
75. 6-Nov-13 189,9927255 174,69420250,00360
76. 7-Nov-13 190,0365195 174,77679320,00362
77. 8-Nov-13 189,7877875 175,13366080,00361
78. 9-Nov-13 189,9615136 175,22267670,00364
79. 10-Nov-13 190,0063477 175,25687340,00360
80. 11-Nov-13 190,2898389 175,22752070,00367
81. 12-Nov-13 190,1044048 175,37396230,00362
82. 13-Nov-13 189,9828091 175,16085210,00364
83. 14-Nov-13 189,887302 174,68171250,00365
84. 15-Nov-13 189,6358417 174,39754180,00365
85. 16-Nov-13 190,5916444 175,52630790,00362
86. 17-Nov-13 190,1320707 175,42987040,00362
87. 18-Nov-13 190,4035349 175,38860980,00360
88. 19-Nov-13 190,5181623 175,3396020,00368
89. 20-Nov-13 190,4254272 175,29599060,00369
(excell)
29Laporan Kerja Praktik
Program Studi Teknik Kimia Akamigas Balongan