33 C.F.R. Subpart B—Design, Equipment, and Installation
Title 33 - Navigation and Navigable Waters
Note: An “oil tanker” as defined in §157.03 includes barges as well as self-propelled vessels. (a) Sections 157.10d and 157.11(g) apply to each vessel to which this part applies. (b) Sections 157.11 (a) through (f), 157.12, 157.15, 157.19(b)(3), 157.33, and 157.37 apply to each vessel to which this part applies that carries 200 cubic meters or more of crude oil or products in bulk as cargo, as well as to each oceangoing oil tanker to which this part applies of 150 gross tons or more. These sections do not apply to a foreign vessel which remains beyond the navigable waters of the United States and does not transfer oil cargo at a port or place subject to the jurisdiction of the United States. (c) Section 157.21 applies to each oil tanker to which this part applies of 150 gross tons or more that is oceangoing or that operates on the Great Lakes. This section does not apply to a foreign vessel which remains beyond the navigable waters of the United States and does not transfer oil cargo at a port or place subject to the jurisdiction of the United States. (d) Sections in subpart B of 33 CFR part 157 that are not specified in paragraphs (a) through (c) of this section apply to each oceangoing oil tanker to which this part applies of 150 gross tons or more, unless otherwise indicated in paragraphs (e) through (m) of this section. These sections do not apply to a foreign vessel which remains beyond the navigable waters of the United States and does not transfer oil cargo at a port or place subject to the jurisdiction of the United States. (e) Sections 157.11 (a) through (f), 157.12, and 157.15 do not apply to a vessel, except an oil tanker, that carries less than 1,000 cubic meters of crude oil or products in bulk as cargo and which retains oily mixtures on board and discharges them to a reception facility. (f) Sections 157.11 (a) through (f), 157.12, 157.13, and 157.15 do not apply to a tank vessel that carries only asphalt, carbon black feedstock, or other products with similar physical properties, such as specific gravity and cohesive and adhesive characteristics, that inhibit effective product/water separation and monitoring. (g) Sections 157.11 (a) through (f), 157.12, 157.13, 157.15, and 157.23 do not apply to a tank barge that cannot ballast cargo tanks or wash cargo tanks while underway. (h) Sections 157.19 and 157.21 do not apply to a tank barge that is certificated by the Coast Guard for limited short protected coastwise routes if the barge is otherwise constructed and certificated for service exclusively on inland routes. (i) Section 157.09(d) does not apply to any: (1) U.S. vessel in domestic trade that is constructed under a contract awarded before January 8, 1976; (2) U.S. vessel in foreign trade that is constructed under a contract awarded before April 1, 1977; or (3) Foreign vessel that is constructed under a contract awarded before April 1, 1977. (j) Sections 157.09 and 157.10a do not apply 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. (k) Sections 157.09(b)(3), 157.10(c)(3), 157.10a(d)(3), and 157.10b(b)(3) do not apply to tank barges. (l) Section 157.10b does not apply to tank barges if they do not carry ballast while they are engaged in trade involving the transfer of crude oil from an offshore oil exploitation or production facility on the Outer Continental Shelf of the United States. (m) Section 157.12 does not apply to a U.S. vessel that: (1) Is granted an exemption under Subpart F of this part; or (2) Is engaged solely in voyages that are: (i) Between ports or places within the United States, its territories or possessions; (ii) Of less than 72 hours in length; and (iii) At all times within 50 nautical miles of the nearest land. (n) Section 157.10d does not apply to: (1) A vessel that operates exclusively beyond the navigable waters of the United States and the United States Exclusive Economic Zone, as defined in 33 U.S.C. 2701(8); (2) An oil spill response vessel; (3) Before January 1, 2015— (i) A vessel unloading oil in bulk as cargo at a deepwater port licensed under the Deepwater Port Act of 1974 (33 U.S.C. 1501 et seq.); or (ii) A delivering vessel that is off-loading oil in bulk as cargo in lightering activities— (A) Within a lightering zone established under 46 U.S.C. 3715(b)(5); and (B) More than 60 miles from the territorial sea base line, as defined in 33 CFR 2.05–10. (4) A vessel documented under 46 U.S.C., Chapter 121, that was equipped with a double hull before August 12, 1992; (5) A barge of less than 1,500 gross tons as measured under 46 U.S.C., Chapter 145, carrying refined petroleum in bulk as cargo in or adjacent to waters of the Bering Sea, Chukchi Sea, and Arctic Ocean and waters tributary thereto and in the waters of the Aleutian Islands and the Alaskan Peninsula west of 155 degrees west longitude; or (6) A vessel in the National Defense Reserve Fleet pursuant to 50 App. U.S.C. 1744. [CGD 75–240, 41 FR 54179, Dec. 13, 1976, as amended by CGD 77–058b, 45 FR 43707, June 30, 1980; CGD 79–152, 45 FR 82249, Dec. 15, 1980; CGD 76–088b, 48 FR 45720, Oct. 6, 1983; CGD 90–051, 57 FR 36239, Aug. 12, 1992; 57 FR 40494, Sept. 3, 1992; CGD 97–023, 62 FR 33364, June 19, 1997] (a) A new vessel of 70,000 tons DWT or more must have segregated ballast tanks that have a total capacity to allow the vessel to meet the draft and trim requirements in paragraph (b) of this section without recourse to the use of oil tanks for water ballast. (b) In any ballast condition during any part of a voyage, including that of lightweight with only segregated ballast, the vessel's drafts and trim must have the capability of meeting each of the following requirements: (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 as specified in paragraph (b)(1) of this section, in association with the trim by the stern of no more than 0.015L. (3) The minimum allowable draft at the after perpendicular is that which is necessary to obtain full immersion of the propeller. (c) The vessel may be designed to carry ballast water in cargo tanks during the condition described in §157.35. (d) Segregated ballast spaces, voids, and other noncargo-carrying spaces for a vessel of conventional form must be distributed: (1) So that the mathematical average of the hypothetical collision (Oc) and the hypothetical stranding (Os) outflows as determined by the application of the procedures in §157.19 and Appendix B is 80 percent or less of the maximum allowable outflow (OA) as determined by §157.19(b)(1); and (2) To protect at least 45 percent of the sum of the side and bottom shell areas, based upon projected molded dimensions, within the cargo tank length. When the vessel design configuration does not provide for the spaces to be distributed to protect at least 45 percent of the side and bottom shell areas, the spaces must be distributed so that the mathematical average of the hypothetical collision (Oc) and the hypothetical stranding (Os) outflows, determined by application of the procedures in §157.19 and Appendix B, is a further 2 percent less than the maximum allowable outflow (Oa) for each 1 percent by which the shell area protection coverage required is not achieved. (e) A ballast space, void or other non-cargo-carrying space used to meet requirements in paragraph (d) of this section must separate the cargo tank boundaries from the shell plating of the vessel by at least 2 meters. (f) A vessel of conventional form for application of this section has: (1) A block coefficient of .80 or greater, (2) A length to depth ratio between 12 and 16, and (3) A breadth to depth ratio between 1.5 and 3.5. (g) Segregated ballast spaces, voids, and other noncargo-carrying spaces for a vessel not of conventional form must be distributed in a configuration acceptable to the Coast Guard. [CGD 74–32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 74–32, 40 FR 49328, Oct. 22, 1975; CGD 75–201, 41 FR 1482, Jan. 8, 1976] (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 §157.10d applies, in accordance with §157.10d(c)(4); or, (2) For a vessel to which §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 §157.35. [CGD 77–058b, 45 FR 43707, June 30, 1980, as amended by CGD 90–051, 57 FR 36239, Aug. 12, 1992] (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 §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] (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 §157.09, §157.10 or §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 §157.35. [CGD 79–152, 45 FR 82249, Dec. 15, 1980] (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 §157.09(b); or (2) A crude oil washing system that meets the design, equipment, and installation requirements of §§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 §157.09(b); or (2) Dedicated clean ballast tanks that meet the design and equipment requirements under §§157.220, 157.222, and 157.224 and have total capacity to allow the vessel to meet the draft and trim requirements in §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 §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 §157.09(b)(1). [CGD 82–28, 50 FR 11626, Mar. 22, 1985; 50 FR 12800, Apr. 1, 1985] (a) With the exceptions stated in §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 §157.10 applies, segregated ballast tanks and a crude oil washing system in accordance with that section. (c) Except on a vessel to which §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. (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. (4) For a vessel to which §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 §157.10(b). Segregated ballast tanks that may be provided in addition to those required under §157.10(b) may be located anywhere within the vessel. (ii) Double side and double bottom tanks used to meet the requirements of §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 §157.10d(c)(1) or §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] (a) Each tank vessel must have a fixed piping system for transferring oily mixtures from cargo tanks to slop tanks and for discharging oily mixtures to the sea and to reception facilities. On a vessel that has two or more independent piping arrangements, the arrangements collectively form the fixed piping system required by this paragraph. (b) Each fixed piping system required by paragraph (a) of this section must have: (1) At least two manifolds on the weather deck for transferring oily mixtures to reception facilities, one of which is on the port side of the vessel and one of which is on the starboard side; and (2) Except as provided in paragraph (c) of this section, at least one discharge point that: (i) Is used for discharges to the sea; (ii) Is on a port or starboard weather deck or on the vessel's side above the waterline of its deepest ballast condition; and (iii) Has an automatic stop valve that is actuated by a cargo monitor signal, except that manual valves may be provided on new vessels of less than 4,000 tons deadweight and on existing vessels. (c) An above waterline discharge point is not required on an existing vessel if its fixed piping system meets Paragraphs 3 and 4 of Appendix E of this part. (d) Each tank vessel under §157.09, §157.10a, or §157.10b that carries crude oil must have: (1) Equipment that drains each cargo pump and oil piping line of oil residue; (2) Oil piping lines for the draining of oil residue from cargo pumps and other oil piping lines to a cargo tank or a slop tank; and (3) An oil piping line that meets paragraph (f) of this section and is connected to the cargo discharge piping on the outboard side of the manifold valves for the draining of oil residue from cargo pumps and other oil piping lines to a receptacle on the shore. (e) Each tank vessel under §157.10 must have: (1) Oil piping lines that are designed and installed to minimize oil retention in those lines; (2) Equipment that drains each cargo pump and oil piping line of oil residue; (3) Oil piping lines for the draining of oil residue from cargo pumps and other oil piping lines to a cargo tank or slop tank; and (4) An oil piping line that meets paragraph (f) of this section and is connected to the cargo discharge piping on the outboard side of the manifold valves for the draining of oil residue from cargo pumps and other oil piping lines to a receptacle on the shore. (f) Each oil piping line under paragraph (d)(3) or (e)(4) of this section must have a cross-sectional area of 10 percent or less of the cross-sectional area of the main cargo discharge piping line, except if the oil piping line under paragraph (d)(3) of this section is installed before January 1, 1980, that piping line may have a cross-sectional area of 25 percent or less of the cross-sectional area of the main cargo discharge piping line. (g) Each tank vessel to which §157.10d applies that is built under a contract awarded after September 11, 1992 must be arranged so that: (1) Except for short lengths of completely welded (or equivalent) piping, (i) Ballast piping and other piping to ballast tanks, such as sounding and vent piping, do not pass through cargo tanks, and (ii) Cargo piping and other piping to cargo tanks do not pass through ballast tanks; (2) Suction wells in cargo tanks that protrude into the double bottom are as small as practicable and extend no closer to the bottom shell plating than 0.5h, as specified in §157.10d(c)(2) or §157.10d(d)(2), as applicable; and (3) On a vessel that is constructed and certificated for service exclusively on inland, Great Lakes, or limited short protected coastwise routes, any oil piping that is located within double hull spaces must be placed as far from the outer shell as is practicable and must be fitted with valves at the point of connection to the tank served, to prevent oil outflow in the event of damage to the piping. Such valves must be closed whenever the vessel is underway with any oil in tanks served by the associated piping, except as necessary during transfer operations. Note: Piping location requirements for an oceangoing vessel are in §157.19(d). Related operating requirements are in §157.45. [CGD 74–32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 80–78, 45 FR 43704, June 30, 1980; CGD 77–058b, 45 FR 43708, June 30, 1980; CGD 79–152, 45 FR 82250, Dec. 15, 1980; CGD 76–088b, 48 FR 45720, Oct. 6, 1983; CGD 90–051, 57 FR 36244, Aug. 12, 1992; USCG–2000–7641, 66 FR 55573, Nov. 2, 2001] (a) Each vessel must have, for each type of cargo oil that it carries, at least one cargo monitor that is designed for use with that oil. (b) Each monitor installed on a U.S. vessel must be approved under 46 CFR 162.050. Each monitor installed on a foreign vessel must be approved: (1) Under 46 CFR 162.050; or (2) As meeting IMO Resolution A.393(X) by a country that has ratified the MARPOL 73/78. (c) Each monitor must be installed in accordance with Paragraphs 4, 5, and 6 of Appendix F to this part and be fitted with the control system prescribed by paragraphs 6.1.4.2 through 6.1.4.5.5 of that appendix. [CGD 76–088b, 48 FR 45720, Oct. 6, 1983, as amended by USCG–1998–3799, 63 FR 35531, June 30, 1998; USCG–2000–7641, 66 FR 55573, Nov. 2, 2001] Each new vessel must have a designated observation area on the weather deck or above that is: (a) Located where the effluent from each discharge point and manifold described in §157.11 can be visually observed; and (b) Equipped with: (1) A means to directly stop the discharge of effluent into the sea; or (2) A positive communication system, such as a telephone or a radio, between the observation area and the discharge control position. [CGD 74–32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 76–088b, 48 FR 45720, Oct. 6, 1983] (a) Number. A tank vessel must have the following number of slop tanks that comply with the requirements of this section: (1) A new vessel of less than 70,000 tons DWT and an existing vessel must have at least one slop tank. (2) A new vessel of 70,000 tons DWT or more must have at least two slop tanks. (b) Capacity. Slop tanks must have the total capacity to retain oily mixtures from cargo tank washings, oil residue, and ballast water containing an oily mixture of 3 percent or more of the oil carrying capacity. Two percent capacity is allowed if there are— (1) Segregated ballast tanks that meet the requirements in §157.09, §157.10, §157.10a, or §157.10b; or (2) No eductors arrangements that use water in addition to the washing water. (c) Design. A slop tank required in this section: (1) Must minimize turbulence, entrainment of oil, and the creation of an emulsion by the use of separate inlet and outlet connections; and (2) May carry bulk oil when not being used as a slop tank. [CGD 74–32, 40 FR 48283, Oct. 14, 1975] Editorial Note: For (a) A tank vessel of 400 gross tons or more must have a tank that receives and holds oil residue resulting from purification of fuel and lubricating oil and from oil leakages in machinery spaces. (b) Each oil residue (sludge) tank required in paragraph (a) of this section must have an adequate capacity that is determined by the: (1) Type of machinery installed on the vessel; and (2) Maximum fuel oil capacity. (c) Each oil residue (sludge) tank on a new vessel must be designed to facilitate: (1) Cleaning; and (2) Discharging to a reception facility. [CGD 74–32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 80–78, 45 FR 43704, June 30, 1980; USCG–2000–7641, 66 FR 55573, Nov. 2, 2001] (a) This section applies to: (1) A U.S. or foreign vessel that is delivered after January 1, 1977; (2) A U.S. vessel that is delivered before January 1, 1977, for which the building contract is awarded after January 1, 1972, or, if there is no building contract, the keel is laid or the vessel is at a similar stage of construction after June 30, 1972; and (3) A foreign vessel that is delivered before January 1, 1977, for which the building contract is awarded after January 1, 1974, or, if there is no building contract, the keel is laid or the vessel is at a similar stage of construction after June 30, 1974. (b) As determined in accordance with the procedures contained in Appendix A of this part, each cargo tank must be of such size and arrangement that: (1) The hypothetical outflow for side damage (Oc) or for bottom damage (Os) anywhere within the length of the vessel must not exceed OA (30,000 cubic meters or (400)×(3√ DWT) whichever is greater, limited to a maximum of 40,000 cubic meters); (2) The volume of each wing tank and center tank is less than the allowable volume of a wing tank (VOLW) and the allowable volume of a center tank (VOLC) respectively; and (3) The length of a tank is less than the allowable length of a tank (la). (c) If a cargo transfer system interconnects two or more cargo tanks, the system must have valves to segregate the tanks from each other. (d) If a line of piping that runs through a cargo tank in a position less than tc from the vessel's side or less than vs from the vessel's bottom as defined in Appendix A of this part, has a branch, that branch must have a stop valve: (1) Within each cargo tank into which the branch opens; or (2) Outside each tank into which the branch opens in a location that is immediately adjacent to the point at which the branch enters the tank. (e) If piping that serves suction wells is installed within a double bottom, that piping must be: (1) Fitted with valves located at the point of connection to the tank served to prevent oil outflow in the event of damage to the piping; and (2) Designed to be installed as high from the bottom shell as possible. [CGD 74–32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 75–240, 41 FR 54180, Dec. 13, 1976; CGD 76–088b, 48 FR 45720, Oct. 6, 1983; USCG–2000–7223, 65 FR 40058, June 29, 2000] A new vessel that is a U.S. vessel must meet the following subdivision and damage stability criteria after assuming side and bottom damages, as defined in Appendix B of this Part. A U.S. vessel that meets the requirements in this section is considered by the Coast Guard as meeting 46 CFR 42.20–5. (a) The final waterline, taking into account sinkage, heel, and trim, must be below the lower edge of an opening through which progressive flooding may take place, such as an air pipe, or any opening that is closed by means of a weathertight door or hatch cover. This opening does not include an opening closed by a: (1) Watertight manhole cover; (2) Flush scuttle; (3) Small watertight cargo tank hatch cover that maintains the high integrity of the deck; (4) Remotely operated watertight sliding door; or (5) Side scuttle of the non-opening type. (b) In the final stage of flooding, the angle of heel due to unsymmetrical flooding must not exceed 25 degrees, except that this angle may be increased to 30 degrees if no deck edge immersion occurs. (c) For acceptable stability in the final stage of flooding, the righting lever curve must have a range of at least 20 degrees beyond the position of equilibrium in association with a maximum residual righting lever of at least 0.1 meter. For the calculations required in this section, weathertight openings or openings fitted with automatic closures (e.g., a vent fitted with a ball check valve), need not be considered as points of downflooding within the range of residual stability, but other openings must be accounted for in the calculation. [CGD 74–32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 75–240, 41 FR 54180, Dec. 13, 1976] All tank ships of 5,000 DWT and above contracted after December 3, 2001 must comply with the intact stability requirements of Regulation 25A, Annex I MARPOL 73/78. [USCG–2000–7641, 66 FR 55573, Nov. 2, 2001] (a) Each tank vessel to which this part applies must have an instruction manual that describes the automatic and manual operation of the cargo and ballast system in the vessel. (b) The format and information contained in the instruction manual required in paragraph (a) of this section must be similar to the manual entitled “Clean Seas Guide for Oil Tankers” which can be obtained from the International Chamber of Shipping, 30–32 St. Mary Axe, London, England, EC3A 8ET. The owner, builder or designer of a new vessel to which this part applies shall submit the documentation specified in this section to the Coast Guard before that vessel enters the navigable waters of the United States. The owner, builder, or designer of a vessel that must comply with §157.10d shall submit the documentation specified in this section to the Coast Guard before that vessel enters the navigable waters of the United States or the U.S. Exclusive Economic Zone. (a) Calculations to substantiate compliance with the tank arrangement and size requirements under §157.19, or a letter from the government of the vessel's flag state that certifies compliance with: (1) Section 157.19; or (2) Regulations 24 of Annex I of the International Convention for the Prevention of Pollution from Ships, 1973. (b) Except for a new vessel that is a foreign vessel, calculations to substantiate compliance with subdivisions and damage stability requirements under §157.21. (c) Plans and calculations to substantiate compliance with the applicable segregated ballast and double hull requirements in §§157.09, 157.10, 157.10a, 157.10b, or 157.10d, or certification from the government of the vessel's flag state that the vessel complies with the segregated ballast and double hull requirements in: (1) Sections 157.09, 157.10, 157.10a, 157.10b, or 157.10d, as applicable; or (2) For a vessel to which §157.10d does not apply, Regulations 13 and 13E of the MARPOL 73/78. (d) Plans and specifications for the vessel that include: (1) Design characteristics; (2) A lines plan; (3) Curves of form (hydrostatic curves) or hydrostatic tables; (4) A general arrangement plan of each deck and level; (5) Inboard and outboard profile plans showing oiltight and watertight bulkheads; (6) A midship section plan; (7) A capacity plan showing the capacity and the vertical and longitudinal centers of gravity of each cargo space, tank, and similar space; (8) Tank sounding tables or tank capacity tables; (9) Draft mark locations; (10) Detailed plans of watertight doors; and (11) Detailed plans of vents. [CGD 75–240, 41 FR 54180, Dec. 13, 1976, as amended by CGD 77–058b, 45 FR 43708, June 30, 1980; CGD 79–152, 45 FR 82250, Dec. 15, 1980; CGD 90–051, 57 FR 36244, Aug. 12, 1992; USCG–2000–7641, 66 FR 55573, Nov. 2, 2001] (a) Before modifications are made to a U.S. tank vessel to meet §157.10a(a)(1), §157.10a(c)(1), §157.10c(b)(1), or §157.10c(c)(1), the vessel's owner or operator must submit the following to the Officer in Charge, Marine Inspection, of the zone where the modification will be made or to the appropriate Coast Guard technical office listed in 157.100(b): (1) A drawing or diagram of the pumping and piping system for the segregated ballast tanks. (2) A drawing of the segregated ballast tank arrangement. (3) Documentation, calculations, or revised stability information to show that the vessel, with the addition of the segregated ballast tanks, meets the stability standards for load line assignment in 46 CFR Part 42. (4) Documentation, calculations, or a revised loading manual to show that the vessel, with the addition of the segregated ballast tanks, meets the structural standards in 46 CFR Part 32. (5) Plans and calculations to show that the vessel, as modified, complies with the segregated ballast capacity and distribution requirements in §157.10a. (b) Before each foreign vessel under §157.10a(a)(1) or §157.10a(c)(1) enters the navigable waters of the United States, the owner or operator of that vessel must— (1) Submit to the Commandant (G-MOC), U.S. Coast Guard, Washington, D.C. 20593–0001— (i) A letter from the authority that assigns the load line to the vessel finding that the location of the segregated ballast tanks is acceptable; and (ii) Plans and calculations to substantiate compliance with the segregated ballast capacity requirements in §157.09(b); or (2) Submit to the Officer in Charge, Marine Inspection, of the zone in which the first U.S. port call is made, a letter or document from the government of vessel's flag state certifying that the vessel complies with the segregated ballast capacity requirements in §157.09(b) or Regulation 13 of the MARPOL 73/78. (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, before that vessel enters the navigable waters of the United States, the owner or operator of an existing foreign vessel under §157.10c(b)(1) or §157.10c(c)(1) must— (1) Submit to the Commandant (G-MOC), U.S. Coast Guard, Washington, D.C. 20593–0001— (i) A letter from the authority that assigns the load line to the vessel finding that the location of the segregated ballast tanks is acceptable; and (ii) Plans and calculations to substantiate compliance with the applicable segregated ballast capacity requirements in §157.09(b) or §157.10c(d); or (2) Submit to the Officer in Charge, Marine Inspection, of the zone in which the first U.S. port call is made a letter from an authorized CS or the government of the vessel's flag state certifying that the vessel complies with the segregated ballast capacity requirements in §157.09(b) or §157.10c(d). [CGD 82–28, 50 FR 11626 and 11630, Mar. 22, 1985, as amended by CGD 88–052, 53 FR 25122, July 1, 1988; CGD 96–026, 61 FR 33668, June 28, 1996; USCG–2000–7641, 66 FR 55573, Nov. 2, 2001; USCG–2006–25150, 71 FR 39210, July 12, 2006]
Title 33: Navigation and Navigable Waters
PART 157—RULES FOR THE PROTECTION OF THE MARINE ENVIRONMENT RELATING TO TANK VESSELS CARRYING OIL IN BULK
Subpart B—Design, Equipment, and Installation
§ 157.08 Applicability of Subpart B.
§ 157.09 Segregated ballast.
§ 157.10 Segregated ballast tanks and crude oil washing systems for certain new vessels.
§ 157.10a Segregated ballast tanks, crude oil washing systems, and dedicated clean ballast tanks for certain new and existing vessels of 40,000 DWT or more.
§ 157.10b Segregated ballast tanks, dedicated clean ballast tanks, and special ballast arrangements for tank vessels transporting Outer Continental Shelf oil.
§ 157.10c Segregated ballast tanks, crude oil washing systems, and dedicated clean ballast tanks for certain new and existing tankships of 20,000 to 40,000 DWT.
§ 157.10d Double hulls on tank vessels.
§ 157.11 Pumping, piping and discharge arrangements.
§ 157.12 Cargo monitor and control system.
§ 157.13 Designated observation area.
§ 157.15 Slop tanks in tank vessels.
§ 157.17 Oil residue (sludge) tank.
§ 157.19 Cargo tank arrangement and size.
§ 157.21 Subdivision and stability.
§ 157.22 Intact stability requirements.
§ 157.23 Cargo and ballast system information.
§ 157.24 Submission of calculations, plans, and specifications.
§ 157.24a Submission of calculations, plans, and specifications for existing vessels installing segregated ballast tanks.
