33 CFR 150.720 - What are the requirements for sound signals?
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The sound signal on each pumping platform complex must be operated whenever the visibility in any horizontal direction from the structure is less than 5 miles. If the platform is under construction, this requirement may be met by the use of a 2-second whistle blast, made every 20 seconds by a vessel moored at the platform.
Title 33 published on 2013-07-01
no entries appear in the Federal Register after this date.