8 9 10 Minim Minimum um ambien ambientt temp temp deg C
18
11 Temperature of Insulation surface
22.89468104
64.4
°F
73.210426 ° F
12 Produc Productt tem temper peratu ature re deg deg C
65
149
°F
13 Steam Steam inlet temper temperatu ature re deg deg C
158
316.4
°F
14 15 Surface temperature Calculation: 16 Heat transfer transfer coefficient coefficient in surrounding surrounding h 17 Thickne Thickness ss of insulat insulation( ion(mi minera nerall wool) wool)
1.43371
x
18 Thermal conductivity of insulation
0.15
k
0.025
19 (x/k)*h
BTU/hr(ft)^2.F ft BTU/hr(ft).F
8.60226
20 Surface temperature deg C
22.89468104
73.21043 °F
21 22 Steam Steam pressur pressure e kg/c kg/cm2 m2g g
4.8
23 Steam pressure kg/cm2A
5.833
82.964661 psia
24 Steam Steam satu saturat ration ion tempera temperatur ture e
315.00
Deg F
25 Enthalpy Enthalpy of superheated superheated steam at supply conditions conditions =
1183.80
BTU/lb
waspwi n software
26 Enthalpy Enthalpy of saturated saturated steam at supply pressure pressure =
1183.80
BTU/lb
waspwi n software
27 Enthalpy Enthalpy of saturated saturated condens condensate ate at supply pressure pressure
284.80
BTU/lb
waspwi n software
28 Heat avai lable per l b of steam =
899.00
BTU/lb
29 Specific Specific volume volume of superhea superheated ted steam =
5.28541
ft3/lb
waspwi n software
30 Specif Specific ic volum volume e of cond condens ensate ate =
0.01760
ft3/lb
waspwi n software
31 32 33 CRUD CRUDE E speci specific fic gra gravit vity y
0.9
34 35 Heat loss from shell 36 hc = 0.3 0.3 Dt^ Dt^0.25 0.25 37 delta t ° F
8.810425879
38
0.516857092
hc hc
BTU/hr(ft)^2.F
39 Calculat Calculation ion of radiati radiation on coeff coeff - hr 40 hr = 0.173 0.173 e [( T1abs/100 T1abs/100)^4 )^4 - ( T2abs/1 T2abs/100)^ 00)^4]/(T1 4]/(T1abs-T2a abs-T2abs) bs) 41
T1abs =
533.2104259
Rankine
42
T2abs =
524.4
Rankine
43
e=
44
hr =
0.818678533
0.8 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 del ta 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
1201956.053
BTU/hr
53 54
Combined heat loss from shell and roof
55
Qc =
56 Add 20% for for combined combined losses losses from appurtenence appurtenences s and tank bottom bottom 57
and to to take take care care of wind wind effec effects. ts.
58 T otal Heat Loss =
1442347.263
BTU/hr
59 Date
Description Made by / Revised by
Date Sht 1
Checked by
of
Approved by
3
Page 1
PROCESS CALCULATION SHEET Job ID:
Client :
Title: Tank coil design calculation
Item No:
Document No: Rev.
0
0
1
Steam flow rate
2
Steam required for maintaning tank temp
1604.390727
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
7
Flow per pipe
8
Pipe ID
9
Pipe c/s area
lb/hr
2 178.6885593
10 Steam velocity at inlets
m3/hr
0.053
m
0.002206183
m2
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
22 For a 2" pipe area per ft length
0.62832
inches ft2/ft
23 24 VGO Properties at film temperature 25 26 Thermal Conductivity of VGO k =
0.067
BTU/hr(ft)2(F/ft)
27 VGO Density
55.62
lb/ft3
r =
28 acceleration of gravity g =
416687846
29 VGO Specific heat c =
0.52
ft / hr^2 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
31.361
BTU/hr(ft)2F
32 33 hc= 116 (( k^3 r^2 c b / m) ( Dt/do))^0.25 = 34 35 Steam side heat transfer coefficient 36
