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Title: LNG Stratification And Rollover
Author: J. A. Sarsten
Source: American Gas Association 1972
Year Published: 1972
Abstract: This report covers an incident where LNG was stratified in an LNG storage tank during filling and how that stratification subsequently resulted in a rollover of the tank contents and the release of a large quantity of gas. On August 21, 1971, LNG storage tank S-1 of the Esso-designed, SNAM LNG Terminal in La Spezia, Italy, experienced a sudden increase in pressure causing a discharge from the tank safety valves and tank vent. The safety valves discharged for about 1 hour and 15 minutes and the vent released at high rates for about 3 hours and 15 minutes. The pressure rose to about 710 mm. of water at its peak which is 210 mm, of water above the nominal lank design pressure of 500 mm. of water.

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