Sizing of Steam Coil of Insulated Tank Rev 3

Title of Calculation: Sizing of heating coil for the insulated tank Client: State Company For Oil Projects (SCOP) Ref doc.: GAD for Fuel Oil Storare Dome Roof Tank Ref Doc no.: 184-TK-13-M-01 Rev A 1 (1) INPUT DATA 2 Content of the tank 3 Diameter of Tank 4 Height of the Tank 5 Max height of the liquid 6 Thickness of shell 7 sec-1 tank bottom to 2m 8 sec-2 next 2m 9 sec-3 & 4 next 4 m 10 sec-5 next 2m 11 sec-6 next 2 m 12 Material of the tank 13 Insulation on walls and top 14 SG of fuel oil 15 Ambient temp 16 Final temp of liquid 17 Steam pressure at coil inlet 18 Heatng time allowable 19 (2) ASSUMED DATA 20 Density of Tank material 21 Specific heat of Tank material 22 Specific heat of Fuel Oil in tank 23 (3) CALCULATIONS 24 (i) Heat require for liquid 25 Volume of Fuel oil 26 Mass of Fuel Oil 27 Temperature rise 28 Heating time 29 Heat required 30 (ii) Heat require for Tank material 31 Volume of tank material 32 Mass of tank material 33 Temperature rise 34 Heat required 35 (iii) Heat loss from tank sides+top 36 Mean liquid temperature 37 Temperature diff 38 Heat Transfer Coeff (insulated tank) 39 Total surface area for heat loss 40 Heat loss 41 (iv) Total heat transfer required

Sizing of steam coil of insulated tank Rev 3

m m m

VKS VKS VKS

MSS MSS MSS

3 2 1

Prep'd by

App'd by

Rev

Fuel Oil 34 12 10.5

mm mm mm mm mm

22 19 15 11 7 Carbon steel 2" thick rockwool 0.96 deg C 20 deg C 100 kg/cm2(g) 7 days 3.0 kg/m3 kJ/kg-C kJ/kg-C

7850 0.5 1.88

m3 kg deg C sec kW

9533 9151836 80 259200 5310

m3 kg deg C kW

19 149251 80 23

deg C deg C W/m2-C m2 kW kW

60 40 2.3 2190 201 5535

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Title of Calculation: Sizing of heating coil for the insulated tank Client: State Company For Oil Projects (SCOP) Ref doc.: GAD for Fuel Oil Storare Dome Roof Tank Ref Doc no.: 184-TK-13-M-01 Rev A

VKS VKS VKS

MSS MSS MSS

3 2 1

Prep'd by App'd by Rev 42 (v) Heat transfer area required 43 Steam pressure at coil inlet kg/cm2(g) 7 44 Temp at the steam deg C 169 45 Specific volume of steam m3/kg 0.243904 46 Mean liquid temperature deg C 60 47 Temp difference deg C 109 48 Heat Transfer Coeff for steam coil W/m2-C 100 49 Heat transfer area required m2 508 50 Inclusive of 10 % margin m2 559 559 559 51 Nominal dia of coil pipe inches 2 3 4 52 Sch of pipe mm 80 80 80 3 53 ID of pipe mm 49.2 73.7 97.2 54 Surface area per unit length m2/m 0.189 0.279 0.358 55 Length m 2955 2002 1560 56 (vi) Steam requirment, coil capacity, no. of coils 57 Specific enthalpy of evaporation kJ/kg 2049.8 58 Steam flowrate required kg/hr 9721 9721 9721 59 Max velocity in coil m/s 30 30 30 60 CSA of coil m2 0.0019012 0.004266 0.00742 61 Volumetric flow m3/hr 205 461 801 62 Specific volume of steam m3/kg 0.243904 0.243904 0.243904 63 Max steam possible kg/hr 842 1889 3286 64 No. of different coils required n 11.55 5.15 2.96 3 65 66 (4) CONCLUSION 67 1. Size of the coil - options ND 2" 3" 4" 68 2. No. of coils 12 5 3 69 3. No. of inlets for steam 12 5 3 70 4. No. of outlets for condensed steam 12 5 3 71 5. Length of each coil 246 400 520 72 6. Total length of coils 2952 2000 1560 3 73 74 (5) REMARKS 75 (i) The coil should slope towards outlet i.e. condensate side. 76 (ii) Coil should not be welded with support to allow expansion during start up. 77 (iii) Provide steam trap between control valve and tank inlet. 78

Sizing of steam coil of insulated tank Rev 3

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