engleski

The use of hydro test results for prediction of finial consolidation - a case history

This paper describes hydro tests performed on five large storage tanks (20.000 m3 each) located at the Zagreb Oil Terminal in Croatia. All tanks are of the same size and have an identical steel structure with a fix external and light floating internal roof and steel bundwall. The diameter of the tanks and bundwalls is 42, 7 m and 47, 7 m respectively. The tanks have 20 000 m3 in volume and their total and overflow height is 14, 4 m and 12, 0 m respectively. The ground at site had previously been used as a gravel-pit and a dump site for chemical waste. For this reason, the top layers of soil down to four meters deep were replaced with controlled compacted gravel as a mitigation measure taken before tank construction. During 2013, all the tanks underwent hydrostatic tests with all stages of water filling and emptying being fully completed. The duration of the tests varied from eleven to thirteen days depending on the tank, and the total test duration was twenty four days. The paper presents the results of the measurements of tank settlements including the estimation of soil consolidation, as well as the estimation of the degree of consolidation and time to final consolidation settlement.

hydro tests, oil tanks, tank settlements

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