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_Jim's avatar

Also maybe of interest: History of HSC Tug Escort Guideline And Regulation Development (Appendix C.3)

https://mxsocal.org/assets/pdf/hsp/32-lalb-hsp-appendix-c-3-2021.pdf

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_Jim's avatar

Well, there is this example where tugs are required: (I hope you don't mind a longish post, and this info refers specifically to the LA/LB area)

TUG ESCORT/ASSIST FOR TANK VESSELS (Chapter XII)

Overview: "Tug Escort" refers to stationing tugs in proximity to a vessel during port transits to provide immediate assistance should a steering or propulsion failure occur. "Tug Assist" refers to positioning tugs alongside a vessel and applying force to assist making turns, reducing speed, providing propulsion and docking.

Tug Escort Applicability: State regulations require escort tug(s) to meet inbound, laden tank vessels (carrying 5,000 or more metric tons of oil in bulk as cargo) at the seaward limit of the applicable Tank Vessel Escort Zone. Also, all tank vessels shifting within the harbor(s) (including dock to anchor, anchor to anchor and dock to dock) must comply with the escort requirements. Assist tugs, in addition to the prescribed escort tugs, may be required during port transits. Outbound laden tank vessels are not required to use escort tugs once they have safely cleared the breakwater. Arrangements should be made via the vessel agent, tug company,or appropriate pilot service to ensure compliance with these regulations.

Excerpted from: https://mxsocal.org/assets/pdf/hsp/09-lalb-hsp-vop_2017.pdf

See also: https://nauticalcharts.noaa.gov/publications/coast-pilot/files/cp7/CPB7_WEB.pdf

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