StacksVerified U.S. regulatory reference

33 CFR §149.550

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Hose strings that are floating or supported on trestles must display the following lights at night and during periods of restricted visibility:
  1. (a)One row of yellow lights that must be:
    1. (1)Flashing 50 to 70 times per minute;
    2. (2)Visible all around the horizon;
    3. (3)Visible for at least 2 miles (3.7 km) on a clear, dark night;
    4. (4)Not less than 1 or more than 3.5 meters (3 to 11.5 feet) above the water;
    5. (5)Approximately equally spaced;
    6. (6)Not more than 10 meters (32.8 feet) apart where the hose string crosses a navigable channel; and
    7. (7)Where the hose string does not cross a navigable channel, there must be a sufficient number to clearly show the hose string's length and course.
  2. (b)Two red lights at each end of the hose string, including the ends in a channel where the hose string is separated to allow vessels to pass, whether open or closed. The lights must be:
    1. (1)Visible all around the horizon;
    2. (2)Visible for at least 2 miles (3.7 km) on a clear, dark night; and
    3. (3)One meter (3 feet) apart in a vertical line with the lower light at the same height above the water as the flashing yellow light.