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7.—(1) After an emergency shut-down valve has operated so as to block the flow of substances within the pipe-line–
(a)the installation manager shall ensure that the manager of every other offshore installation to which the pipe-line is connected and the person for the time being entitled to operate the pipe-line are notified; and
(b)the valve shall not be re-opened so as to permit the flow of such substances unless the reason for the operation of the valve has been established to the satisfaction of the installation manager and he has authorised the re-opening of the valve.
(2) Before giving his authority for the purpose of paragraph (1)(b) above, the installation manager shall ensure that the manager of every other offshore installation to which the pipe-line in question is connected and the person for the time being entitled to operate the pipe-line have been consulted.
(3) An emergency shut-down valve shall be used only to block the flow of substances through the pipe-line into which it is fitted and shall not be used to adjust that flow.