H2Tech - Q3 2022 - 30

MAINTENANCE AND RELIABILITY
The loads considered for this assessment
were self-weight due to gravity,
internal pressure, and loading resulting
from internal pressure, such as nozzle
end loads (blow-off loads). No additional
system loading was available, and thermal
loading or thermal transients were not
considered, which is likely insignificant,
considering operating temperature.
TABLES 2 and 3 summarize the loading
cases and the actual loads (e.g., pressure
and axial stress) applied on the model.
The basic material properties of ASTM
A516Gr.70 for FEA were the same for all
12 vessels:
* Density of 7,850kg/m3
* Young's modulus of 207 GPa
* Poisson's ration of 0.3.
FEA result. Linear elastic stress analyses
were performed based on a finite element
model of PSA vessels so the stresses in the
critical locations of interest where cracking
was detected could be resolved correctly
and accurately. However, the model
FIG. 2. Resulting stresses through a section of the vessel due to the hydrotest load case:
(A) hoop stress, (B) von Mises stress and (c) maximum principal stress.
TABLE 2. Load cases considered for assessment
Load case
1
2
3
Condition
Hydrotest
Maximum operating
Minimum operating
Objective
Critical fl aw size determination
Maximum stress for fatigue crack growth calculations
Minimum stress for fatigue crack growth calculations
TABLE 3. Summary of loads applied for assessment
Load case Internal pressure, Mpa Axial force top nozzle, kN Axial force bottom nozzle, kN
1
2
3
3.82
2.01
0.03
TABLE 4. Summary of stress results
Load cases
Hydrotest
Location
Top nozzle, N02
Bottom nozzle, N01
Top head weld, H01
Middle body weld, H02
Bottom head weld, H03
Upper vertical weld, V01
Lower vertical weld, V02
* Bending stress at external surface
30 Q3 2022 | H2-Tech.com
Membrane
stress, Mpa
181.6
172.7
78.3
158.2
77.8
115.6
115.5
Bending
stress*, Mpa
29.7
22.8
2
-2
1.9
20.1
20.1
Maximum operating
Membrane
stress, Mpa
95.3
90.9
41.1
83.2
40.7
60.8
60.7
Bending
stress*, Mpa
15.6
12.1
1.1
-1
1
10.5
10.6
Minimum operating
Membrane
stress, Mpa
1.1
1.6
0.5
1.2
0.1
0.94
0.8
Bending
stress*, Mpa
0.08
0.4
0.04
-0.02
0.01
0.13
0.2
700.76
368.35
5.39
303.76
159.67
2.34
FIG. 3. Weld ID used in the inspection
and FFS assessment.
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H2Tech - Q3 2022

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Contents
H2Tech - Q3 2022 - Cover1
H2Tech - Q3 2022 - Cover2
H2Tech - Q3 2022 - Contents
H2Tech - Q3 2022 - 4
H2Tech - Q3 2022 - 5
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H2Tech - Q3 2022 - Cover3
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https://www.nxtbook.com/nxtbooks/gulfpub/h2tech_q4_2021
https://www.nxtbook.com/nxtbooks/gulfpub/h2tech_q3_2021
https://www.nxtbook.com/nxtbooks/gulfpub/h2tech_q2_2021
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