Cálculos de Adecuación de Tanque: Espesor, Compresión y Ventilación

Tank shell fit for purpose calculations
Company
Tank Id
Design code
Shell Material
Tank diameter
Tank height
Design pressure
No. shell courses
Hydrotestic test conditions:
D
H
Pd
m
m
mbar
The following formula is used in calculating the
required minimal thickness of shell courses:
t m in 
bottom
D
98 .r .( h  0.3)  p   CA
20 .S D .E
E = joint efficiency factor
kg/l
m
r
1.00
12.80
Course
Product
Minimum
Allowable
Joint
calc.
Installed
measured
Minimal
Integrity
No.
height
height
Yield
Stress
Efficiency
t
thickness
thickness
thickness
check
Y
factor
Factor
incl. CA
7
6
5
4
3
2
1
[m]
[m]
[ N/mm2]
k
1.89
1.89
1.89
1.89
1.89
1.89
1.89
13.20
1.49
3.37
5.26
7.14
9.03
10.91
12.80
210
210
210
210
210
210
210
0.667
0.667
0.667
0.667
0.667
0.667
0.667
Product conditions:
S = maximum allowable stress in N/mm2 (see 5.7)
h
Course
24.40
13.20
20.00
7
top
Water density
Filling height
Product density
Max fill height
per DEP
[mm]
[mm]
[mm]
[mm]
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.19
2.80
4.41
6.02
7.62
9.23
10.84
6.00
6.00
6.00
7.00
8.00
10.00
11.00
6.00
6.00
6.00
7.00
8.00
10.00
11.00
3.00
3.00
4.41
6.02
7.62
9.23
10.84
OK
OK
OK
OK
OK
OK
OK
r
h
kg/l
m
0.75
12.80
Course
Course
Product
Minimum
Allowable
Joint
calc.
Installed
measured
Minimal
Integrity
No.
height
height
Yield
Stress
Efficiency
t
thickness
thickness
thickness
check
Y
factor
Factor
incl. CA
H = height from the lower edge of the course under
consideration to the top of the shell in metres
[m]
[m]
[ N/mm2]
k
1.89
1.89
1.89
1.89
1.89
1.89
1.89
1.49
3.37
5.26
7.14
9.03
10.91
12.80
210
210
210
210
210
210
210
0.67
0.67
0.67
0.67
0.67
0.67
0.67
per DEP
[mm]
[mm]
[mm]
[mm]
0.93
2.14
3.35
4.55
5.76
6.97
8.18
6.0
6.0
6.0
7.0
8.0
10.0
11.0
6.0
6.0
6.0
7.0
8.0
10.0
11.0
3.00
3.00
3.35
4.55
5.76
6.97
8.18
D = nominal diameter of tank in metres
p = design pressure in mbar (ga)
CA = corrosion allowance in mm (for special cases only, to be
specified in requisition; normally zero)
w = maximum density of product to be stored in g/ml (a value
top
of 1.00 shall be used even where the product to be stored is
lighter)
k=0.67 (new) or 0.8(fit for purpose)
bottom
7
6
5
4
3
2
1
1.00
1.00
1.00
1.00
1.00
1.00
1.00
OK
OK
OK
OK
OK
OK
OK
Compression Ring calculations
T52
Calculation for compression area as required (BS2654, section 8.5.2) :
Tank diameter
D
Tank radius
R
Tank height
H
Design pressure
p
Design windspeed
Vw
Sc
Allowable compressive stress
N/mm2
24.40
12.20
13.20
20.00
45.00
120.00
tr
r
L
mm
kg/m3
mbar
5.00
7850.00
3.93
kg/m2
slope
degr
11.30
slope 1:5
Ar
mm2
4989
A
tr
ts
R2
mm
mm
m
5.00
6.00
62.27
AD
mm2
1674
Roofplate thickness (annular)
SG(density) of steel
deadload roof plates
Roof slope
Required compression area
Calculation for section area as avaialble :
WT Roofplates
WT Top Course
Radius of roof curvature
Area D (Roof Wh)
m
m
m
mbar
m/s
unless other wise specified
39.25
50. p.R 2
S C .TAN( )
, with p less roof weight
Wh =
Wc =
335
162
mm
mm
Top Curb 1
Roofslope 1:5
b
150
h
150
WT
10
Area of angle 2
AT1
mm2
2900
AT1
mm2
0
AC
mm2
974
Aa
mm2
5548
approx.
Top Curb 2
Area C (shell Wc)
Available compression area (A ac =A D +A n +A C )
Conclusion :
Radius
Aa>Ar, L-Profile is OK!
Maximum internal pressure
Maximum design pressure
Pd
Wc
TopCurb Angle
Area of angle 1
WTshell
mbar
24.5
See API650, section F.4.1.
Wind Load Condition
see BS2654, section 7.3.2.7
Tank diameter
Tank height
design wind speed
design vacuum
Calc. Factor
Top course thickness-CA
t 
H e  hcourse  m in 
 t 
D
H
Vw
Va
K
tmin
m
m
m/s
mbar
m
24.40
13.20
45.00
6.00
8.883
6.00
Course
No.
Course
height
hc[m]
[m]
1.89
6.00
1.89
6.00
1.89
6.00
1.89
7.00
1.89
8.00
1.89
10.00
bottom
1.89
11.00
sum(transposed)
Max permitted spacing (unstiffed)
Min. No. of secondary wind girders required
1.89
1.89
1.89
1.28
0.92
0.53
0.41
8.80
6.499
1.00
Cummel.
Transposed
width [m]
top
7
6
5
4
3
2
1
95000
2
3.563Vw  580 v a
 t m in 5 
H p  K  3 
 D 
No. of windgirders installed
Other shapes with equivalent section
modulus may be used. The section
modulus may include a portion of the
shell for a distance of 16 times shell plate
thickness above and below the stiffener.
He
Course
thickness
t [mm]
5
H E   He
K
Design vacuum
DEP 70.51.10.11-Gen.Use for Va: 2.5 mbar (ga) for non-pressure fixed roof
tanks; 5.0 mbar (ga) for open top floating roof tanks; 6.0 mbar (ga) for low
and high pressure fixed roof tanks / BS2654, section 7.3.2.6 Use for Va: 5
mbar (ga) for non-pressure; 8.5 mbar for other
Tank diameter
(m)
D  20
20 < D  36
36 < D  48
48 > D
MIN Stiffener
(mm)
100 x 65 x 8
125 x 75 x 8
150 x 90 x 10
200 x 100 x 12
2
8.80
6.91
5.03
3.14
1.86
0.94
0.41
HE
Hp (H1)
OK!
Tank Venting Calculations API2000
Data Given :
Diameter
Height
Tank capacity
Code
Design pressure
Design vacuum
Flash point product
Max pump-in rate
Max pump-out rate
Tank insulated ?
Hot Climate
Insulation thicknes
Environmental factor
Wetted area
metric
U.S.
7.6
7.6
347
Low
20
6
176
80
20
N
no
0
m
m
3
m
Pressure
mbar
mbar
o
C
3
m /hour
m3/hour
182
m2
mm
25
25.0
2185
Low
8.03
2.41
349
503
126
N
no
0
1
1964
ft
ft
barrels
Pressure
inch w.c.
inch w.c.
o
F
barrels/h
barrels/h
inch
ft
SCFH = Standard Cubic Feet of air per Hour
(1) Normal outbreathing (Pressure relief) requirements:
Required venting capacity for normal pressure relief due to pumping-in
Required capacity= (6xSCFH )x(Max pump-in rate)
Required capacity=
3018
SCFH
Required venting capacity for normal pressure relief due to thermal outbreathing
see table II-collumn 3 of API2000, 2.4.2 for product with flash point >100oF (INTERMEZZO-I)
Required capacity=
1312
SCFH air
Total required normal pressure relief capacity
=
3018
+
1312
=
4330
123
SCFH air
m3/hour
=
2890
82
SCFH air
m3/hour
(2) Normal inbreathing (Vacuum relief) requirements:
Required venting capacity for normal vacuum relief due to pumping-out
Required capacity= (5.6 SCFH)x(Max pump-out rate)
Required capacity=
704
SCFH
Required venting capacity for normal vacuum relief due to thermal inbreathing
see table II-collumn 2 of API2000, 2.4.2
Required capacity=
2185
SCFH air
Correction for climate
2185
if applicable
Total required normal vacuum relief capacity
=
704
+
2185
(3) Emergency venting
Emergency venting required in accordance with API 2000, section 4.3.3.2, Table 3
m3/hour (incl. the environmental factor)
Required capacity Q=
-3809
-134194 SCFH air
Tank Venting Calculations API2000
Data Given :
Diameter
Height
Tank capacity
Code
Design pressure
Design vacuum
Flash point product
Max pump-in rate
Max pump-out rate
Tank insulated ?
Hot Climate
Insulation thicknes
Environmental factor
Wetted area
metric
24.0
m
14.5
m
3
m
6537
Low
Pressure
20
mbar
6
mbar
o
C
-40
3
m /hour
900
m3/hour
900
N
no
0
mm
689
m2
U.S.
79
47.4
41111
Low
8.03
2.41
-40
5659
5659
N
no
0
1
7419
ft
ft
barrels
Pressure
inch w.c.
inch w.c.
o
F
barrels/h
barrels/h
inch
ft
SCFH = Standard Cubic Feet of air per Hour
(1) Normal outbreathing (Pressure relief) requirements:
Required venting capacity for normal pressure relief due to pumping-in
Required capacity= (12xSCFH )x(Max pump-in rate)
Required capacity=
67914
SCFH
Required venting capacity for normal pressure relief due to thermal outbreathing
see table II-collumn 3 of API2000, 2.4.2 for product with flash point >100oF (INTERMEZZO-I)
Required capacity=
34926 SCFH air
Total required normal pressure relief capacity
=
67914
+
34926
=
102840
2919
SCFH air
m3/hour
=
66619
1891
SCFH air
m3/hour
(2) Normal inbreathing (Vacuum relief) requirements:
Required venting capacity for normal vacuum relief due to pumping-out
Required capacity= (5.6 SCFH)x(Max pump-out rate)
Required capacity=
31693
SCFH
Required venting capacity for normal vacuum relief due to thermal inbreathing
see table II-collumn 2 of API2000, 2.4.2
Required capacity=
34926 SCFH air
Correction for climate
34926 if applicable
Total required normal vacuum relief capacity
=
31693
+
34926
(3) Emergency venting
Emergency venting required in accordance with API 2000, section 4.3.3.2, Table 3
m3/hour (incl. the environmental factor)
Required capacity Q=
19910
701353 SCFH air