bab 3(tugas khusus) perhitungan

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



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





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





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





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



Q1 = Q2

Fluidanya Process water sama quench oil lho



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 =





=

= 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)





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





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



Dibagi OD ya zrul



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


Uc =

=


a’’ = 0,032 [Kern. Tabel 10 ]

A = Nt x L x a’’

= 5004 x 27,887 x 0,032

= 4552,32 ft2

UD =





=

= 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





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





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





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)



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