(a) This section applies to a new vessel that:
(1) Is constructed under a building contract awarded after June 1, 1979;
(2) In the absence of a building contract, has the keel laid or is at a similar stage of construction after January 1, 1980;
(3) Is delivered after June 1, 1982; or
(4) Has undergone a major conversion for which:
(i) The contract is awarded after June 1, 1979;
(ii) In the absence of a contract, conversion is begun after January 1, 1980; or
(iii) Conversion is completed after June 1, 1982.
(b) Each tank vessel under this section of 20,000 DWT or more that carries crude oil and of 30,000 DWT or more that carries products must have segregated ballast tanks that have a total capacity to allow the vessel to meet the draft and trim requirements in paragraph (c) of this section without recourse to the use of cargo tanks for water ballast.
(c) In any ballast condition during any part of a voyage, including that of lightweight with only segregated ballast, each tank vessel under paragraph (b) of this section must have the capability of meeting each of the following:
(1) The molded draft amidship (dm) in meters, without taking into account vessel deformation, must not be less than dm in the following mathematical relationship: dm = 2.0 + 0.02L
(2) The drafts at the forward and after perpendiculars must correspond to those determined by the draft amidship under paragraph (c)(1) of this section, in association with a trim by the stern of no more than 0.015L.
(3) The minimum draft at the after perpendicular is that which is necessary to obtain full immersion of the propeller.
(d) Segregated ballast tanks required in paragraph (b) of this section, voids, and other spaces that do not carry cargo must be distributed:
(1) For a vessel to which Sec. 157.10d applies, in accordance with Sec. 157.10d(c)(4); or,
(2) For a vessel to which Sec. 157.10d does not apply, in accordance with the procedure contained in appendix C to this part.
(e) Each tank vessel under this section of 20,000 DWT or more that carries crude oil must have a crude oil washing system that meets the design, equipment, and installation requirements in subpart D of this part.
(f) Each tank vessel under this section may be designed to carry ballast water in cargo tanks as allowed under Sec. 157.35. [CGD 77-058b, 45 FR 43707, June 30, 1980, as amended by CGD 90-051, 57 FR 36239, Aug. 12, 1992] Sec. 157.10a Segregated ballast tanks, crude oil washing systems, anddedicated clean ballast tanks for certain new and existing vessels of40,000 DWT or more.
(a) An existing vessel of 40,000 DWT or more that carries crude oil and a new vessel of 40,000 DWT or more but less than 70,000 DWT that carries crude oil must have:
(1) Segregated ballast tanks with a total capacity to meet the draft and trim requirements in paragraph (d) of this section; or
(2) A crude oil washing system that meets the design, equipment, and installation requirements of subpart D of this part.
(b) [Reserved]
(c) An existing vessel of 40,000 DWT or more that carries products and a new vessel of 40,000 DWT or more but less than 70,000 DWT that carries products must have:
(1) Segregated ballast tanks with a total capacity to meet the draft and trim requirements in paragraph (d) of this section; or
(2) Dedicated clean ballast tanks that have a total capacity to meet the draft and trim requirements in paragraph (d) of this section and that meet the design and equipment requirements under subpart E of this part.
(d) In any ballast condition during any part of a voyage, including that of lightweight with either segregated ballast in segregated ballast tanks or clean ballast in dedicated clean ballast tanks, each tank vessel under paragraph (a)(1), or (c) of this section must have the capability of meeting each of the following without recourse to the use of cargo tanks for water ballast:
(1) The molded draft amidship (dm) in meters, without taking into account vessel deformation, must not be less than dm in the following mathematical relationship: dm=2.0+0.02L
(2) The drafts at the forward and after perpendiculars must correspond to those determined by the draft amidship under paragraph (d)(1) of this section, in association with a trim by the stern of no more than 0.015L.
(3) The minimum draft at the after perpendicular is that which is necessary to obtain full immersion of the propeller.
(e) Each tank vessel that meets paragraph (a)(1), or (c) of this section may be designed to carry ballast water in cargo tanks as allowed under Sec. 157.35.
Note: Segregated ballast tanks located in wing tanks provide protection against oil outflow in the event of a collision, ramming, or grounding. [CGD 77-058b, 45 FR 43707, June 30, 1980, as amended by CGD 82-28, 50 FR 11626, Mar. 22, 1985; USCG-1998-3799, 63 FR 35531, June 30, 1998] Sec. 157.10b Segregated ballast tanks, dedicated clean ballast tanks,and special ballast arrangements for tank vessels transporting OuterContinental Shelf oil.
(a) Each tank vessel that is engaged in the transfer of crude oil from an offshore oil exploitation or production facility on the Outer Continental Shelf of the United States on or after June 1, 1980 must, if segregated ballast tanks or dedicated clean ballast tanks are not required under Sec. 157.09, Sec. 157.10 or Sec. 157.10a, have one of the following:
(1) Segregated ballast tanks with a total capacity to meet the draft and trim requirements in paragraph (b) of this section.
(2) Dedicated clean ballast tanks having a total capacity to meet the draft and trim requirements in paragraph (b) of this section and meeting the design and equipment requirements under subpart E of this part.
(3) Special ballast arrangements acceptable to the Coast Guard.
(b) In any ballast condition during any part of a voyage, including that of lightweight with either segregated ballast in segregated ballast tanks or clean ballast in dedicated clean ballast tanks, each vessel under paragraph (a)(1) or (a)(2) of this section must have the capability of meeting each of the following:
(1) The molded draft amidship (dm), in meters, without taking into account vessel deformation, must not be less than ``dm'' in the following mathematical relationship: dm=2.00+0.020L for vessels of 150 meters or more in length dm=1.25+0.025L for vessels less than 150 meters in length
(2) The drafts, in meters, at the forward and after perpendiculars must correspond to those determined by the draft amidship under paragraph (b)(1) of this section, in association with a trim, in meters, by the stern (t) of no more than ``t'' in the following mathematical relationship: t=0.015L for vessels of 150 meters or more in length t=1.5+0.005L for vessels less than 150 meters in length
(3) The minimum draft at the after perpendicular is that which is necessary to obtain full immersion of the propeller.
(c) Special ballast arrangements are accepted under the procedures in paragraph (d) of this section if:
(1) The vessel is dedicated to one specific route;
(2) Each offshore transfer facility on the route is less than 50 miles from shore;
(3) The duration of the ballast voyage is less than 10 hours;
(4) They prevent the mixing of ballast water and oil; and
(5) They provide suitable draft and trim to allow for the safe navigation of the vessel on the intended route.
(d) The owner or operator of a vessel that meets paragraph (c) of this section must apply for acceptance of the special ballast arrangement, in writing, to the Officer in Charge, Marine Inspection, of the zone in which the vessel operates. The application must contain:
(1) The specific route on which the vessel would operate;
(2) The type of ballast to be carried;
(3) The location of the ballast on the vessel;
(4) Calculations of draft and trim for maximum ballast conditions; and
(5) The associated operating requirements or limitations necessary to ensure safe navigation of the vessel.
Note: Operating requirements or limitations necessary to ensure safe navigation of the vessel could include (but are not limited to) weather conditions under which the vessel would not operate and weather conditions under which cargo would be carried in certain cargo tanks on the ballast voyage.
(e) The Coast Guard will inform each applicant for special ballast arrangements under paragraph (d) of this section whether or not the arrangements are accepted. If they are not accepted, the reasons why they are not accepted will be stated.
(f) Each tank vessel under this section may be designed to carry ballast water in cargo tanks, as allowed under Sec. 157.35. [CGD 79-152, 45 FR 82249, Dec. 15, 1980] Sec. 157.10c Segregated ballast tanks, crude oil washing systems, anddedicated clean ballast tanks for certain new and existing tankships of20,000 to 40,000 DWT.
(a) This section applies to each tankship of 20,000 DWT or more, but less then 40,000 DWT, except each one that--
(1) Is constructed under a building contract awarded after June 1, 1979;
(2) In the absence of a building contract, has the keel laid or is at a similar stage of construction after January 1, 1980;
(3) Is delivered after June 1, 1982; or
(4) Has undergone a major conversion, for which--
(i) The contract is awarded after June 1, 1979; or
(ii) Conversion is completed after June 1, 1982.
(b) On January 1, 1986, or 15 years after the date it was delivered to the original owner or 15 years after the completion of a major conversion, whichever is later, a vessel under this section that carries crude oil must have--
(1) Segregated ballast tanks that have a total capacity to allow the vessel to meet the draft and trim requirements in Sec. 157.09(b); or
(2) A crude oil washing system that meets the design, equipment, and installation requirements of Secs. 157.122 through 157.138.
(c) On January 1, 1986, or 15 years after the date it was delivered to the original owner or 15 years after the completion of a major conversion, whichever is later, a vessel under this section that carries product must have--
(1) Segregated ballast tanks that have total capacity to allow the vessel to meet the draft and trim requirements in Sec. 157.09(b); or
(2) Dedicated clean ballast tanks that meet the design and equipment requirements under Secs. 157.220, 157.222, and 157.224 and have total capacity to allow the vessel to meet the draft and trim requirements in Sec. 157.09(b).
(d) If the arrangement of tanks on a vessel under this section is such that, when using the tankage necessary to comply with the draft and trim requirements in Sec. 157.09(b), the draft amidships exceeds the minimum required draft by more the 10 percent, or the arrangement results in the propeller being fully immersed by more than 10 percent of its diameter, alternative arrangements may be accepted provided--
(1) At least 80 percent of the propeller diameter is immersed; and
(2) The moulded draft amidships is at least 80 percent of that required under Sec. 157.09(b)(1). [CGD 82-28, 50 FR 11626, Mar. 22, 1985; 50 FR 12800, Apr. 1, 1985] Sec. 157.10d Double hulls on tank vessels.
(a) With the exceptions stated in Sec. 157.08(n), this section applies to a tank vessel--
(1) For which the building contract is awarded after June 30, 1990;
(2) That is delivered after December 31, 1993;
(3) That undergoes a major conversion for which;
(i) The contract is awarded after June 30, 1990; or
(ii) Conversion is completed after December 31, 1993; or
(4) That is otherwise required to have a double hull by 46 U.S.C. 3703a(c).
Note: The double hull compliance dates of 46 U.S.C. 3703a(c) are set out in appendix G to this part. To determine a tank vessel's double hull compliance date under OPA 90, use the vessel's hull configuration (i.e., single hull; single hull with double sides; or single hull with double bottom) on August 18, 1990.
(b) Each vessel to which this section applies must be fitted with:
(1) A double hull in accordance with this section; and
(2) If Sec. 157.10 applies, segregated ballast tanks and a crude oil washing system in accordance with that section.
(c) Except on a vessel to which Sec. 157.10d(d) applies, tanks within the cargo tank length that carry any oil must be protected by double sides and a double bottom as follows:
(1) Double sides must extend for the full depth of the vessel's side or from the uppermost deck, disregarding a rounded gunwale where fitted, to the top of the double bottom. At any cross section, the molded width of the double side, measured at right angles to the side shell plating, from the side of tanks containing oil to the side shell plating, must not be less than the distance w as shown in Figure 157.10d(c) and specified as follows:
(i) For a vessel of 5,000 DWT and above: w=[0.5+(DWT/20,000)] meters; or, w=2.0 meters (79 in.), whichever is less, but in no case less than 1.0 meter (39 in.).
(ii) For a vessel of less than 5,000 DWT: w=[0.4+(2.4)(DWT/20,000)] meters, but in no case less than 0.76 meter (30 in.).
(iii) For a vessel to which paragraph (a)(4) of this section applies: w=0.76 meter (30 in.), provided that the double side was fitted under a construction or conversion contract awarded prior to June 30, 1990. [GRAPHIC] [TIFF OMITTED] TC18OC91.015
(2) At any cross section, the molded depth of the double bottom, measured at right angles to the bottom shell plating, from the bottom of tanks containing oil to the bottom shell plating, must not be less than the distance h as shown in Figure 157.10d(c) and specified as follows:
(i) For a vessel of 5,000 DWT and above: h=B/15; or, h=2.0 meters (79 in.), whichever is less, but in no case less than 1.0 meter (39 in.).
(ii) For a vessel of less than 5,000 DWT: h=B/15, but in no case less than 0.76 meter (30 in.).
(iii) For a vessel to which paragraph (a)(4) of this section applies: h=B/15; or, h=2.0 meters (79 in.), whichever is the lesser, but in no case less than 0.76 meter (30 in.), provided that the double bottom was fitted under a construction or conversion contract awarded prior to June 30, 1990.
(3) For a vessel built under a contract awarded after September 11, 1992, within the turn of the bilge or at cross sections where the turn of the bilge is not clearly defined, tanks containing oil must be located inboard of the outer shell--
(i) For a vessel of 5,000 DWT and above: At levels up to 1.5h above the base line, not less than the distance h, as shown in Figure 157.10d(c) and specified in paragraph (c)(2) of this section. At levels greater than 1.5h above the base line, not less than the distance w, as shown in Figure 157.10d(c) and specified in paragraph (c)(1) of this section.
(ii) For a vessel of less than 5,000 DWT: Not less than the distance h above the line of the mid-ship flat bottom, as shown in Figure 157.10d(c)(3)(ii) and specified in paragraph (c)(2) of this section. At levels greater than h above the line of the mid-ship flat bottom, not less than the distance w, as shown in Figure 157.10d(c)(3)(ii) and specified in paragraph (c)(1) of this section. [GRAPHIC] [TIFF OMITTED] TC18OC91.016
(4) For a vessel to which Sec. 157.10(b) applies that is built under a contract awarded after September 11, 1992.
(i) The aggregate volume of the double sides, double bottom, forepeak tanks, and afterpeak tanks must not be less than the capacity of segregated ballast tanks required under Sec. 157.10(b). Segregated ballast tanks that may be provided in addition to those required under Sec. 157.10(b) may be located anywhere within the vessel.
(ii) Double side and double bottom tanks used to meet the requirements of Sec. 157.10(b) must be located as uniformly as practicable along the cargo tank length. Large inboard extensions of individual double side and double bottom tanks, which result in a reduction of overall side or bottom protection, must be avoided.
(d) A vessel of less than 10,000 DWT that is constructed and certificated for service exclusively on inland or limited short protected coastwise routes must be fitted with double sides and a double bottom as follows:
(1) A minimum of 61 cm. (2 ft.) from the inboard side of the side shell plate, extending the full depth of the side or from the main deck to the top of the double bottom, measured at right angles to the side shell; and
(2) A minimum of 61 cm. (2 ft.) from the top of the bottom shell plating, along the full breadth of the vessel's bottom, measured at right angles to the bottom shell.
(3) For a vessel to which paragraph (a)(4) of this section applies, the width of the double sides and the depth of the double bottom may be 38 cm. (15 in.), in lieu of the dimensions specified in paragraphs (d)(1) and (d)(2) of this section, provided that the double side and double bottom tanks were fitted under a construction or conversion contract awarded prior to June 30, 1990.
(4) For a vessel built under a contract awarded after September 11, 1992, a minimum 46 cm. (18 in.) clearance for passage between framing must be maintained throughout the double sides and double bottom.
(e) Except as provided in paragraph (e)(3) of this section, a vessel must not carry any oil in any tank extending forward of:
(1) The collision bulkhead; or
(2) In the absence of a collision bulkhead, the transverse plane perpendicular to the centerline through a point located:
(i) The lesser of 10 meters (32.8 ft.) or 5 percent of the vessel length, but in no case less than 1 meter (39 in.), aft of the forward perpendicular;
(ii) On a vessel of less than 10,000 DWT tons that is constructed and certificated for service exclusively on inland or limited short protected coastwise routes, the lesser of 7.62 meters (25 ft.) or 5 percent of the vessel length, but in no case less than 61 cm. (2 ft.), aft of the headlog or stem at the freeboard deck; or
(iii) On each vessel which operates exclusively as a box or trail barge, 61 cm. (2 ft.) aft of the headlog.
(3) This paragraph does not apply to independent fuel oil tanks that must be located on or above the main deck within the areas described in paragraphs (e)(1) and (e)(2) of this section to serve adjacent deck equipment that cannot be located further aft. Such tanks must be as small and as far aft as is practicable.
(f) On each vessel, the cargo tank length must not extend aft to any point closer to the stern than the distance equal to the required width of the double side, as prescribed in Sec. 157.10d(c)(1) or Sec. 157.10d(d)(1). [CGD 90-051, 57 FR 36239, Aug. 12, 1992, as amended by USCG-1999-6164, 65 FR 39262, June 23, 2000]