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API Std 650 10th Ed. Add.3
E.5.1
Seismic design of tanks: Shell compression: unanchored tanks
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../../Images/vessels/API650/E_5_1.png
minbottomthkbthk1thk2thk3thk4thk5thk6thk7thk8thk9thk10liqheightliqdensspecMaterialDoh1h2h3h4h5h6h7h8h9h10
1
specgrav
Specific gravity of liquid in tank:
MATERIAL
2
CA
Corrosion allowance: total:
3
Yield
Minimum yield strength:
4
densmat
Density of shell material:
COEFFICIENTS AND MASSES
5
Ifact
Zcoef
Zone and essential facility coefficients:
6
DsuH
Ratio:
7
Scoef
Site coefficient: see Info:
8
Tslo
Period of the first sloshing mode:
9
C2
C1
Lateral force coefficient:
10
massroof
masscyl
Shell and roof masses:
11
massW2
massW1
Liquid effective mass:
12
hGroof
hGcyl
Center of gravity heights:
13
hGW2
hGW1
 
RESULTS
14
momentOver
Overturning moment: at shell bottom:
15
massOver
Liquid mass: used to resist overturning:
16
massroofOver
Tank roof mass: portion supported by shell:
17
masscrOver
Tank total mass supported by shell:
18
ribafact
Overturning factor:
19
stressCompr
Compressive stress: at shell bottom:
20
allowCompr
Maximum allowable compressive stress:
21
result
Result of calculation:
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