23 0 209KB
Tank shell fit for purpose calculations Company
Hydrotestic test conditionsWater density
Tank Id Design code Shell Material Tank diameter Tank height Design pressure No. shell courses
Filling height
D H Pd
m m
24.40 13.20
mbar
20.00 7 top
The following formula is used in calculating the required minimal thickness of shell courses:
t m in
bottom
Course
Product
No.
height
height
Minimum Allowable
kg/l
1.00
m
12.80
Joint
calc.
Installed
measured
Minimal
Integrity
Yield
Stress
Efficiency
t
thickness
thickness
thickness
check
Y
factor
Factor
incl. CA
[m]
[m]
[ N/mm2]
k
7
1.89
1.49
210
0.667
6 5
1.89 1.89
3.37 5.26
210 210
0.667 0.667
4 3
1.89 1.89
7.14 9.03
210 210
2 1
1.89 1.89
10.91 12.80
210 210
per DEP
[mm]
[mm]
[mm]
[mm]
1.00
1.19
6.00
6.00
3.00
OK
1.00 1.00
2.80 4.41
6.00 6.00
6.00 6.00
3.00 4.41
OK OK
0.667 0.667
1.00 1.00
6.02 7.62
7.00 8.00
7.00 8.00
6.02 7.62
OK OK
0.667 0.667
1.00 1.00
9.23 10.84
10.00 11.00
10.00 11.00
9.23 10.84
OK OK
r h
kg/l
0.75
m
12.80
13.20
D 98 .r .( h 0.3) p CA 20 .S D .E
S = maximum allowable stress in N/mm2 (see 5.7) E = joint efficiency factor H = height from the lower edge of the course under consideration to the top of the shell in metres 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 of 1.00 shall be used even where the product to be stored is lighter)
Course
r h
Product conditions:
Product density Max fill height
top
k=0.67 (new) or 0.8(fit for purpose)
bottom
Course
Course
Product
No.
height
height
Minimum Allowable
Joint
calc.
Installed
measured
Minimal
Integrity
Yield
Stress
Efficiency
t
thickness
thickness
thickness
check
Y
factor
Factor
incl. CA
[m]
[m]
[ N/mm2]
k
7 6
1.89 1.89
1.49 3.37
210 210
0.67 0.67
5 4 3
1.89 1.89 1.89
5.26 7.14 9.03
210 210 210
2 1
1.89 1.89
10.91 12.80
210 210
per DEP
[mm]
[mm]
[mm]
[mm]
1.00 1.00
0.93 2.14
6.0 6.0
6.0 6.0
3.00 3.00
OK OK
0.67 0.67 0.67
1.00 1.00 1.00
3.35 4.55 5.76
6.0 7.0 8.0
6.0 7.0 8.0
3.35 4.55 5.76
OK OK
0.67 0.67
1.00 1.00
6.97 8.18
10.0 11.0
10.0 11.0
6.97 8.18
OK OK OK
Compression Ring calculations Calculation for compression area as required (BS2654, section 8.5.2) : Tank diameter D m Tank radius R m Tank height H m Design pressure p mbar Design windspeed Vw m/s
T52
24.40 12.20 13.20 20.00 45.00
Allowable compressive stress
Sc
N/mm2
120.00
Roofplate thickness (annular) SG(density) of steel deadload roof plates
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
tr ts
mm
5.00
Wh =
335
mm
6.00 62.27
Wc =
162
mm
1674
Roof slope Required compression area
Calculation for section area as avaialble : WT Roofplates WT Top Course Radius of roof curvature
R2
mm m
Area D (Roof Wh)
AD
mm2
unless other wise specified
A
39.25
50. p.R 2 S C .TAN ( )
, with p less roof weight
T o p C u rb 1
R o o f s lo p e 1 : 5
b
h
WT
Area of angle 1
150
150
10
Area of angle 2 Area C (shell Wc) Available compression area (Aac=AD+An+AC) Conclusion :
AT1
mm2
2900
AT1
mm2
0
AC
mm2
974
Aa
mm2
5548
approx.
T o p C u rb 2
R a d iu s
Aa>Ar, L-Profile is OK!
Maximum internal pressure Maximum design pressure
Wc
TopCurb Angle
Pd
W T
mbar
24.5
s h e ll
See API650, section F.4.1.
Wind Load Condition see BS2654, section 7.3.2.7 Tank diameter Tank height
D H Vw
design wind speed design vacuum Calc. Factor Top course thickness-CA
H e=hcourse
Va K tmin
√(
t min t
m m
24.40 13.20
m/s mbar m
45.00 6.00 8.883 6.00
95000 3 .563 V
H p =K
√(
t
w
)
D
Course
Course
No.
height hc[m]
thickness t [mm]
7 6 5 4 3 2 1
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
)
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.
Course
He
Cummel. Transposed
[m]
width [m]
1.89 1.89 1.89 1.28 0.92 0.53 0.41 8.80 6.499 1.00
8.80 6.91 5.03 3.14 1.86 0.94 0.41
top
2 +580 v a
5 min 3
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
5
H E =∑ H e K=
Design vacuum
No. of windgirders installed Tank diameter (m)
MIN Stiffener size (mm)
D £ 20 20 < D £ 36 36 < D £ 48 48 > D
100 x 65 x 8 125 x 75 x 8 150 x 90 x 10 200 x 100 x 12
2
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 m3 Pressure mbar mbar o C m3/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 >100 oF (INTERMEZZO-I) Required capacity= 1312 SCFH air Total required normal pressure relief capacity = 3018
+
1312
=
4330 123
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
=
2890 82
(3) Emergency venting Emergency venting required in accordance with API 2000, section 4.3.3.2, Table 3 Required capacity Q= -3809 m3/hour (incl. the environmental factor) -134194 SCFH air
SCFH air m3/hour
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 6537 m3 Low Pressure 20 mbar 6 mbar o -40 C 900 m3/hour 900 m3/hour 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 >100 oF (INTERMEZZO-I) Required capacity= 34926 SCFH air Total required normal pressure relief capacity = 67914
+
34926
=
102840 2919
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
=
66619 1891
(3) Emergency venting Emergency venting required in accordance with API 2000, section 4.3.3.2, Table 3 Required capacity Q= 19910 m3/hour (incl. the environmental factor) 701353 SCFH air
SCFH air m3/hour