Retired Coast Guard Admiral Thad Allen said the cap could possibly shut the well, but might also be used only to block the flow during emergency situations like a hurricane, when BP's surface containment effort would be suspended.
BP Plc conducted pressure tests on its blown-out Gulf of Mexico well on Thursday and said no oil was leaking into the ocean for the first time since the accident began in April.
As part of the test, BP shut off the valves to a newly placed containment cap. Initial results early on in the test showed that the cap had completely contained the flow from the ruptured deep-sea well, BP said.
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