An internal floating roof is to be installed on an existing large API storage tank. In order to ensure the proper functionality of the roof, the deformation of the shell has been monitored and analysed. The measurements on the shell ovality show that the actual radial deformation is beyond the acceptable limit for installation of a serviceable internal floating roof and corrective actions should be taken. Consequently, a series of tests and analyses were performed to provide a recommended practice to restore the tank to its round shape.

References

1.
Myers
,
P. E.
,
1997
,
Aboveground Storage Tanks
,
McGraw-Hill
,
New York
.
2.
Marr Allen
W.
,
Ramos
,
J. A.
, and
William Lambe
,
T.
,
1982
, “
Criteria for Settlement of Tanks
,”
J. Geotech. Engrg. Div.
,
108
, pp.
1017
1039
.
3.
Malik
,
Z.
,
Morton
,
J.
, and
Ruiz
,
C.
,
1977
, “
Ovalization of Cylindrical Tanks as a Result of Foundation Settlement
,”
J. Strain Anal. Eng. Des.
,
12
, pp.
339
348
.10.1243/03093247V124339
4.
Joel
,
L.
,
Andreani
,
A.
, and
Nick
,
C.
,
2007
, “
Final Report on the Study of Out-of-Plane Tank Settlement API-N004 -0 -04
,” Washington, D.C, API SCAST, SCI.
5.
American Petroleum Institute
,
API Standard 653, Tank Inspection, Repair, Alteration, and Reconstruction
, 4th ed., 2009, addendum 2,
2012
.
6.
Koezwara
,
F. A.
,
1980
, “
Simple Method Calculates Tank Shell Distortion,
Hydrocarbon Processing
, Vol. 08, pp.
101
104
.
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