8/13/2019 126717676 Tank Heat Calculation

1/7

Job ID: Client :

Title: Tank coil design calculation Item No:1 Tank dia m 74.5

2 Tank height m 20

3

4 Shell Surface area m2 4680.97

5 = Shell Surface area ft2 50385.57

6 Roof surface area m2 4359.16

7 = Roof surface area ft2 46921.57

8

9

10 Minimum ambient temp deg C 18 64.4 F

11 Temperature of Insulation surface 22.89468104 73.210426 F

12 Product temperature deg C 65 149 F

13 Steam inlet temperature deg C 158 316.4 F

14

15 Surface temperature Calculation:

16 Heat transfer coefficient in surrounding h 1.43371 BTU/hr(ft)^2.F

17 Thickness of insulation(mineral wool) x 0.15 ft

18 Thermal conductivity of insulation k 0.025 BTU/hr(ft).F

19 (x/k)*h 8.60226

20 Surface temperature deg C 22.89468104 73.21043 F

21

22 Steam pressure kg/cm2g 4.8

23 Steam pressure kg/cm2A 5.833 82.964661 psia

24 Steam saturation temperature 315.00 Deg F

25 Enthalpy of superheated steam at supply conditions = 1183.80 BTU/lb waspwin software

26 Enthalpy of saturated steam at supply pressure = 1183.80 BTU/lb waspwin software

27 Enthalpy of saturated condensate at supply pressure 284.80 BTU/lb waspwin software

28 Heat available per lb of steam = 899.00 BTU/lb

29 Specific volume of superheated steam = 5.28541 ft3/lb waspwin software

30 Specific volume of condensate = 0.01760 ft3/lb waspwin software

31

32

33 CRUDE specific gravity 0.9

34

35 Heat loss from shell

36 hc = 0.3 Dt 0.25

37 delta t F 8.810425879

38 hc 0.516857092 BTU/hr(ft)^2.F

39 Calculation of radiation coeff - hr

40 hr = 0.173 e [( T1abs/100)^4 - ( T2abs/100)^4]/(T1abs-T2abs)

41 T1abs = 533.2104259 Rankine

42 T2abs = 524.4 Rankine

43 e = 0.8

44 hr = 0.818678533 BTU/hr(ft)^2.F

45 hc + hr = 1.335535625 BTU/hr(ft)^2.F

46 Shell Heat Loss Q = (hc+hr)ADt = 592868.7985 BTU/hr

47

48 Heat loss from roof

49 hc = 0.38 delta t^0.25 0.65468565 BTU/hr(ft)^2.F

50 hr (remains same) = 0.818678533 BTU/hr(ft)^2.F

51 hc+hr = 1.473364183 BTU/hr(ft)^2.F

52 Roof Heat Loss Q = (hc+hr)ADt = 609087.2542 BTU/hr

53

54 Combined heat loss from shell and roof

55 Qc = 1201956.053 BTU/hr

56 Add 20% for combined losses from appurtenences and tank bottom

57 and to take care of wind effects.

58 Total Heat Loss = 1442347.263 BTU/hr

59

Date Date

Description

PROCESS CALCULATION SHEET Document No:

8/13/2019 126717676 Tank Heat Calculation

2/7

Job ID: Client :Title: Tank coil design calculation Item No:

1 Steam flow rate

2 Steam required for maintaning tank temp 1604.390727 lb/hr

3 Steam required for maitening tank temp 727.7402576 kg/hr

4 Steam volume flow rate ( at inlets) 8479.86642 ft3/hr

5 Steam volume flow rate ( at inlets) 357.3771185 m3/hr

6 Number of inlets 2

7 Flow per pipe 178.6885593 m3/hr

8 Pipe ID 0.053 m

9 Pipe c/s area 0.002206183 m2

10 Steam velocity at inlets 22.49845139 m/s

11

12 Thermal calculations

13

14 Crude side convection coefficient

15

16 Neglecting metal tube resistance and neglecting steam superheat

17 Hot surface temperature Th = 315.00 F

18 Cold liquid temperature Tc = 149 F

19 Temperature Difference Dt = 166.00 F

20 Film temperature tf = 232.00 F

21 Pipe OD do = 2.4 inches

22 For a 2" pipe area per ft length 0.62832 ft2/ft

23

24 VGO Properties at film temperature25

26 Thermal Conductivity of VGO k = 0.067 BTU/hr(ft)2(F/ft)

27 VGO Density r = 55.62 lb/ft3

28 acceleration of gravity g = 416687846 ft / hr^2

29 VGO Specific heat c = 0.52 btu/lb/deg F

30 Coeff. of thermal expansion b = approx 0.004310345 1/F

31 Viscosity m =( 12 centistokes x 0.84 ) = 27 Centipoises

32

33 hc= 116 (( k^3 r^2 c b / m) ( Dt/do))^0.25 = 31.361 BTU/hr(ft)2F

34

35 Steam side heat transfer coefficient

36 h(m^2/(k^3 r^2 g))^(1/3) = 1.51 ( 4 G / m)^ ( -1/3) 12.40 pp 265, 269 12.4537

38 No of pipes per tank Nt = 2

39 Assume each pipe length L = 100 ft

40 Total condensate load W = 1604.390727 lb/hr

41 Condensate Loading G = W/(0.5 L Nt ) = 16.04390727 lb/hr/ft

42

43

44 Condensate properties at condensing temperature

45 Viscosity m = 0.463 lb/ft/hr waspwin software

46 thermal conductivity k = 0.3973 Btu/hr/ft2/(F/ft) waspwin software

47 density r = 57.619 lb/ft3 waspwin software

48 acceleration of gravity g = 416687846 ft / hr^2

49

50 1.51 ( 4 G / m ) (-1/3) = 0.291774432

51 ( m^2/(k^3 r^2 g) )^(1/3) = 0.000135193

52 Condensing film coeff h = 2158.204 Btu/hr/ft2/F

53 Pipe OD 2.4 inches

54 Pipe ID 2.09 inches

55 hio = h ( ID / OD ) 1879.43627 Btu/hr/ft2/F

56

Date Date

Description

Made by / Revised by

PROCESS CALCULATION SHEET Document No:

0

8/13/2019 126717676 Tank Heat Calculation

3/7

Job ID: Client :

Title: Tank coil design calculation Item No:

1 Overall Heat Transfer

2 VGO side ho = 31.361 Btu/hr/ft2/F

3 Steam side hio = 1879.43627 Btu/hr/ft2/F

4 Clean coeff Uc = hio ho /( hio + ho ) = 30.84641207 Btu/hr/ft2/F

5 Fouling factor Rd = 0.004

6 Dirty Coeff UD = ( Uc / Rd ) / ( Uc + 1/Rd ) 27.45843524 Btu/hr/ft2/F

7 Area A = Q/ ( UD Dt ) = 316.4360554 ft2

8 Total pipe length per tank 503.6236239 ft

9 No of pipes per tank Nt = 2

10 Length of each pipe 251.811812 ft

11

12 Length of each pipe 76.75224029 m

13 No of pipes per tank 2

14 Total pipe length per tank 153.5044806 m

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34 RESULTS:35

36 Total Heat Loss = 1442347.263 BTU/hr

37

38 Steam required for maintaining tank temp 727.7402576 kg/hr

39

40 Total pipe length required 153.5044806 m

41

42

43

44

45

46

47

48

49

50

Date Date

Description

Made by / Revised by

Checked by

Approved by

0

PROCESS CALCULATION SHEET Document No:

8/13/2019 126717676 Tank Heat Calculation

4/7

Job ID: Client :Rev.

Title: Tank coil design calculation Item No:1 Tank dia m 74.5

2 Tank height m 20

3

4 Shell Surface area m2 4680.97

5 = Shell Surface area ft2 50385.57

6 Roof surface area m2 4359.16

7 = Roof surface area ft2 46921.57

8

9

10 Minimum ambient temp deg C 18 64.4 F

11 Temperature of Insulation surface 22.89468104 73.210426 F

12 Product temperature deg C 65 149 F

13 Steam inlet temperature deg C 158 316.4 F

14

15 Surface temperature Calculation:

16 Heat transfer coefficient in surrounding h 1.43371 BTU/hr(ft)^2.F

17 Thickness of insulation(mineral wool) x 0.15 ft

18 Thermal conductivity of insulation k 0.025 BTU/hr(ft).F

19 (x/k)*h 8.60226

20 Surface temperature deg C 22.89468104 73.21043 F

21

22 Steam pressure kg/cm2g 4.8

23 Steam pressure kg/cm2A 5.833 82.964661 psia

24 Steam saturation temperature 315.00 Deg F

25 Enthalpy of superheated steam at supply conditions = 1183.80 BTU/lb waspwin software

26 Enthalpy of saturated steam at supply pressure = 1183.80 BTU/lb waspwin software

27 Enthalpy of saturated condensate at supply pressure 284.80 BTU/lb waspwin software

28 Heat available per lb of steam = 899.00 BTU/lb

29 Specific volume of superheated steam = 5.28541 ft3/lb waspwin software

30 Specific volume of condensate = 0.01760 ft3/lb waspwin software

31

32

33 CRUDE specific gravity 0.9

34

35 Heat loss from shell

36 hc = 0.3 Dt 0.25

37 delta t F 8.810425879

38 hc 0.516857092 BTU/hr(ft)^2.F

39 Calculation of radiation coeff - hr

40 hr = 0.173 e [( T1abs/100)^4 - ( T2abs/100) 4]/(T1abs-T2abs)

41 T1abs = 533.2104259 Rankine

42 T2abs = 524.4 Rankine

43 e = 0.8

44 hr = 0.818678533 BTU/hr(ft)^2.F

45 hc + hr = 1.335535625 BTU/hr(ft)^2.F

46 Shell Heat Loss Q = (hc+hr)ADt = 592868.7985 BTU/hr

47

48 Heat loss from roof

49 hc = 0.38 delta t^0.25 0.65468565 BTU/hr(ft)^2.F

50 hr (remains same) = 0.818678533 BTU/hr(ft)^2.F

51 hc+hr = 1.473364183 BTU/hr(ft)^2.F

52 Roof Heat Loss Q = (hc+hr)ADt = 609087.2542 BTU/hr

53

54 Combined heat loss from shell and roof

55 Qc = 1201956.053 BTU/hr

56 Add 20% for combined losses from appurtenences and tank bottom

57 and to take care of wind effects.

58 Total Heat Loss = 1442347.263 BTU/hr

59

Date Date

Description Sht

PROCESS CALCULATION SHEET Document No:

8/13/2019 126717676 Tank Heat Calculation

5/7

Job ID: Client :Rev.

Title: Tank coil design calculation Item No: 0

1 Steam flow rate

2 Steam required for maintaning tank temp 1604.390727 lb/hr

3 Steam required for maitening tank temp 727.7402576 kg/hr

4 Steam volume flow rate ( at inlets) 8479.86642 ft3/hr

5 Steam volume flow rate ( at inlets) 357.3771185 m3/hr

6 Number of inlets 2

7 Flow per pipe 178.6885593 m3/hr

8 Pipe ID 0.053 m

9 Pipe c/s area 0.002206183 m2

10 Steam velocity at inlets 22.49845139 m/s

11

12 Thermal calculations

13

14 Crude side convection coefficient

15

16 Neglecting metal tube resistance and neglecting steam superheat

17 Hot surface temperature Th = 315.00 F

18 Cold liquid temperature Tc = 149 F

19 Temperature Difference Dt = 166.00 F

20 Film temperature tf = 232.00 F

21 Pipe OD do = 2.4 inches

22 For a 2" pipe area per ft length 0.62832 ft2/ft

23

24 VGO Properties at film temperature25

26 Thermal Conductivity of VGO k = 0.067 BTU/hr(ft)2(F/ft)

27 VGO Density r = 55.62 lb/ft3

28 acceleration of gravity g = 416687846 ft / hr^2

29 VGO Specific heat c = 0.52 btu/lb/deg F

30 Coeff. of thermal expansion b = approx 0.004310345 1/F

31 Viscosity m =( 12 centistokes x 0.84 ) = 27 Centipoises

32

33 hc= 116 (( k^3 r^2 c b / m) ( Dt/do))^0.25 = 31.361 BTU/hr(ft)2F

34

35 Steam side heat transfer coefficient

36 h(m^2/(k^3 r^2 g))^(1/3) = 1.51 ( 4 G / m)^ ( -1/3) 12.40 pp 265, 269 12.4537

38 No of pipes per tank Nt = 2

39 Assume each pipe length L = 100 ft

40 Total condensate load W = 1604.390727 lb/hr

41 Condensate Loading G = W/(0.5 L Nt ) = 16.04390727 lb/hr/ft

42

43

44 Condensate properties at condensing temperature

45 Viscosity m = 0.463 lb/ft/hr waspwin software

46 thermal conductivity k = 0.3973 Btu/hr/ft2/(F/ft) waspwin software

47 density r = 57.619 lb/ft3 waspwin software

48 acceleration of gravity g = 416687846 ft / hr^2

49

50 1.51 ( 4 G / m ) (-1/3) = 0.291774432

51 ( m^2/(k^3 r^2 g) )^(1/3) = 0.000135193

52 Condensing film coeff h = 2158.204 Btu/hr/ft2/F

53 Pipe OD 2.4 inches

54 Pipe ID 2.09 inches

55 hio = h ( ID / OD ) 1879.43627 Btu/hr/ft2/F

56

Date Date

Description Sht

Made by / Revised by 2

PROCESS CALCULATION SHEET Document No:

0

8/13/2019 126717676 Tank Heat Calculation

6/7

Job ID: Client : Rev.

Title: Tank coil design calculation Item No: 0

1 Overall Heat Transfer

2 VGO side ho = 31.361 Btu/hr/ft2/F

3 Steam side hio = 1879.43627 Btu/hr/ft2/F

4 Clean coeff Uc = hio ho /( hio + ho ) = 30.84641207 Btu/hr/ft2/F

5 Fouling factor Rd = 0.004

6 Dirty Coeff UD = ( Uc / Rd ) / ( Uc + 1/Rd ) 27.45843524 Btu/hr/ft2/F

7 Area A = Q/ ( UD Dt ) = 316.4360554 ft2

8 Total pipe length per tank 503.6236239 ft

9 No of pipes per tank Nt = 2

10 Length of each pipe 251.811812 ft

11

12 Length of each pipe 76.75224029 m

13 No of pipes per tank 2

14 Total pipe length per tank 153.5044806 m

15

16

17

18

19

20

2122

23

24

25

26

27

28

29

30

31

32

33

34 RESULTS:35

36 Total Heat Loss = 1442347.263 BTU/hr

37

38 Steam required for maintaining tank temp 727.7402576 kg/hr

39

40 Total pipe length required 153.5044806 m

41

42

43

44

45

4647

48

49

50

Date Date

Description Sht

Made by / Revised by 3

Checked by of

Approved by 3

0

PROCESS CALCULATION SHEET Document No:

8/13/2019 126717676 Tank Heat Calculation

7/7

mm

kW

W/m2K

kW

kW

Page 7