46 C.F.R. Subpart C—Rules for Assigning Working Freeboards to Hopper Dredges
Title 46 - Shipping
Source: CGD 76–080, 54 FR 36977, Sept. 6, 1989, unless otherwise noted.
This subpart applies to each self-propelled hopper dredge— (a) For which a working freeboard assignment is desired after January 1, 1990; and (b) That operates with a working freeboard assigned under this subpart. Hopper dredge means a self-propelled dredge with an open hold or hopper in the hull of the dredge that receives dredged material. Working freeboard means one-half the distance between the mark of the load line assigned under this subchapter and the freeboard deck. To request a working freeboard, calculations, plans, and stability information necessary to demonstrate compliance with this subpart must be submitted to the: (a) Commanding Officer, U.S. Coast Guard Marine Safety Center (G-MSC), 400 Seventh Street SW., Washington, DC 20590–0001; or (b) American Bureau of Shipping, ABS Plaza, 16855 Northchase Drive, Houston, TX 77060. [CGD 76–080, 54 FR 36977, Sept. 6, 1989, as amended by USCG–1998–4442, 63 FR 52190, Sept. 30, 1998; USCG–2000–7790, 65 FR 58459, Sept. 29, 2000] A hopper dredge may be issued a working freeboard on a limited service domestic voyage load line certificate or a Great Lakes load line certificate if the following are met: (a) The hopper dredge structure must have adequate strength for any draft up to the working freeboard draft. Dredges built and maintained in conformity with the requirements of a classification society recognized by the Commandant usually meet this requirement. (b) The hopper dredge must— (1) Meet subpart I of part 174 of this chapter; and (2) Have on its bridge remote draft indicators that: (i) Show the fore, aft, and mean draft of the dredge at all times while the dredge is operating; and (ii) Have each indicator marked with the assigned freeboard and the working freeboard. (a) Each hopper dredge assigned a working freeboard may be operated at drafts from the normal freeboard to the working freeboard if the— (1) Seas are not more than 10 feet; (2) Winds are not more than 35 knots; (3) Area of operation is not more than 20 nautical miles (37 kilometers) from the mouth of a harbor of safe refuge; and (4) Specific gravity of the spoil carried is not more than the highest specific gravity of spoil used in the stability calculations required by subchapter S of this chapter. (b) The Assigning Authority designates on the face of the dredge's load line certificate— (1) Each restriction contained in paragraph (a)(1) through (a)(3) of this section; and (2) The maximum specific gravity of the spoils allowed to be carried.
Title 46: Shipping
PART 44—SPECIAL SERVICE LIMITED DOMESTIC VOYAGES
Subpart C—Rules for Assigning Working Freeboards to Hopper Dredges
§ 44.300 Applicability.
§ 44.310 Definitions.
§ 44.320 Submission of plans and calculations.
§ 44.330 Obtaining working freeboards for hopper dredges.
§ 44.340 Operating restrictions.
