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Title: Evaluation Of Decommissioned LNG Storage Tanks At Chula Vista, Califomia
Author: James P. Lewis, Ted A. Williams
Source: American Gas Association 1991
Year Published: 1991
Abstract: The dismantling of the San Diego Gas & Electric LNG facilities offered an opportunity to evaluate two of the first 9 percent nickel steel LNG storage tanks in the U.S. The metallurgical evaluation concluded that: There was no slow crack extension from pre-existing crack-like discontinuities. The chemical composition and the mechanical properties of base 9 percent nickel plate and weld metal were consistent with both the present requirements of API 620 Appendix Q and the requirements current at the time the tanks were built. The tank materials had good resistance to crack initiation as well as the capability to arrest cracks that might be accidentally initiated. There was no significant amount of corrosion found. The structural and operational performance evaluation concluded that: No evidence was found of distress at the joint between the shell plate and the footer plate of the inner tanks The compaction control blankets performed as intended and there was no evidence of perlite compaction. There was some loss of Foamglas insulation under the concrete bearing pad in Tank T-80 attributable to lack of a load distributing material at Foamglas surfaces. A computer program was developed which allowed the stress environment to be established for the fracture mechanics analyses. From this, crack initiation resistance and crack arrest capabilities were determined. The retention of construction and operational records for extended life operations is important.

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