place throughout its length due to the assumed side damage as outlined in paragraph (c) (4) of this section. (2) Where two adjacent main subdivision compartments are separated by a bulkhead which is stepped under the conditions of § 73.10-40 or 73.15-20, the intact stability shall be adequate to withstand the flooding assumed under § 73.10-40 or 73.15-20 of this subchapter, as applicable. (c) Damaged stability calculations. (1) The requirements of paragraph (b) of this section shall be determined by calculations which take into consideration the proportions and design characteristics of the vessel and the arrangement and configuration of the damaged compartments. Where decks, inner skins, or longitudinal bulkheads are to be fitted of sufficient tightness to seriously restrict the flow of water, the Commandant shall be satisfied that proper consideration is given to such restrictions in the calculations. Vessel category All vessels. Vessels without factor of subdi- Vessels with factor of subdivision TABLE 74.10–15 (c) (4) Longitudinal extent 1 10 feet +0.03L or 35 feet (which- 10 feet +0.03L or 35 feet (which- 20 feet +0.04L involving not 1 L equals the length of the vessel as defined in § 73.05-3. 2B equals the breadth of the vessel as defined in § 73.05-4. The transverse extent of damage is measured inboard from the vessel's side and at right angles to the centerline at the level of the deepest subdivision load line. For vessels on inland waters and for ferry vessels, where the maximum molded beam at the deck and at the load water line differ appreciably, the transverse extent of damage may be taken as the mean between the inboard penetration at the deck using the maximum beam at the deck and the inboard penetration at the deepest subdivision load line using the maximum beam at that load line. Where no double bottom is fitted, the vertical extent of damage shall be taken from the molded baseline. (5) Unsymmetrical flooding is to be kept to a minimum consistent with efficient arrangements. Where special cross-flooding fittings are provided, such fittings and the maximum heel before equalization shall be to the satisfaction of the Commandant. On vessels under 150 gross tons in ocean or coastwise service and on all vessels in lake, bay, and sound or river service, the equalizing arrangements, where required, shall not be dependent either upon manual or automatic operation of valves or similar appliances. (6) For symmetrical flooding, the final residual metacentric height after damage shall be positive. (7) For unsymmetrical flooding with assumed side damage less than 30 feet plus .06L, the final heel due to the unsymmetrical moment shall not exceed 7 degrees, except that in special cases the Commandant may allow additional heel, but in no case shall the final heel exceed 15 degrees. (8) For unsymmetrical flooding with assumed side damage of 30 feet plus .06L, the final heel due to the unsymmetrical flooding shall in no case exceed 20 degrees. (9) In no case shall the margin line be submerged in the final stage of flooding. If it is considered that the margin line may become submerged during an intermediate stage of flooding, the Commandant may require such investigations and arrangements as shall be considered necessary for the safety of the vessel. (1) (d) Relaxation of requirements. No relaxation from the requirements for damaged stability may be considered by the Commandant unless it is shown that the intact metacentric height in any service condition necessary to meet these requirements is excessive for the service intended. (2) Relaxations from the requirements for damaged stability shall be permitted only in exceptional cases and subject to the conditions that the Commandant is to be satisfied that the proportions, arrangements and other characteristics of the vessel are the most favorable to stability after damage which can practically and reasonably be adopted in the particular circumstances. (e) Vessels contracted for prior to November 19, 1952. (1) Vessels contracted for prior to November 19, 1952, shall meet the following requirements: (i) Existing arrangements, materials, and facilities, previously approved will be considered satisfactory so long as they meet the minimum requirements of this subparagraph and they are maintained in a suitable condition to the satisfaction of the Officer in Charge, Marine Inspection. Minor repairs and alterations may be made to the same standards as the original installation. (ii) The details and arrangements shall be in general agreement with the provisions of paragraphs (b) through (d) of this section, except that on vessels where it has not been found reasonable nor practicable to apply at least a one-compartment standard of subdivision, such vessels will not be required to comply with this subparagraph. § 74.10-20 Special operating conditions. (a) Where a vessel may be operated under conditions where its stability will be affected by factors not covered by §§ 74.10-5 through 74.10-15 such factors shall be investigated to determine if the vessel has sufficient stability to meet such conditions. SUBPART 74.15-BALLAST $74.15-1 When required. (a) Where it is determined that a vessel does not have sufficient stability to meet the requirements of the stability standard and the characteristics of the vessel cannot be altered to provide the required stability, ballast may be required. This ballast may be solid fixed ballast, liquid ballast, or both. § 74.15-5 How installed. (a) Solid ballast, when required, shall be installed in the vessel under the supervision of the Officer in Charge, Marine Inspection. The amount of installed ballast shall be weighed or otherwise accurately determined and located in a vertical and longitudinal position to meet the stability requirements. This ballast shall be stowed in a satisfactory manner to prevent shifting of position in a seaway. Such ballast required for stability shall not be removed from the vessel or relocated unless approved by the Commandant, except that such ballast may be temporarily moved for examination or repair of the vessel, when done under the supervision of an inspector. § 74.15-10 Liquid ballast. (a) Liquid ballast may be used to the extent that is reasonably practicable in the operation of the vessel. SUBPART 74.20-STABILITY INSTRUCTIONS FOR OPERATING PERSONNEL § 74.20-1 Data supplied master. (a) The master of the vessel shall be supplied with the data necessary to maintain sufficient intact stability under service conditions to provide satisfactory operating stability and also to enable the vessel to meet the damaged stability requirements. § 74.20-5 Conditions under which calculations made. (a) The master of the vessel shall be informed of the conditions under which the damaged stability calculations have been made and advised to what extent the vessels can safely withstand damage under these assumed conditions. § 74.20-10 Cross-flooding. (a) In the case of a vessel requiring cross-flooding, the master shall be provided with the conditions of stability on which the calculations of heel are based and be warned that excessive heel might result should the vessel sustain damage when in a less favorable condition. Suitable information shall be supplied concerning the use of any special cross-flooding fittings. master of the vessel. If in the case of some vessels, where the instructions can be quite simple, they may be incorporated directly in the stability letter. SUBPART 74.25-STABILITY LETTER § 74.25-1 Posting. (a) Each vessel subject to the requirements of this part shall have posted under glass in the pilothouse a stability letter issued by U. S. Coast Guard before the vessel is placed in service operation. This letter shall indicate, either by specific instructions embodied in the letter or by reference to separate instructions available to the master, the conditions of operation under which the vessel will have satisfactory stability. Part 75—Lifesaving Equipment Sec. Subpart 75.01-Application 75.01-1 Details of application. Subpart 75.05-General Provisions Pertaining to Lifesaving Equipment 75.05-1 Equipment of an approved type. 75.05-5 Equipment installed but not required. Subpart 75.10-Lifeboats, Life Rafts, Life Floats, and Buoyant Apparatus Application. 75.10-1 75.10-5 Type of lifeboats, life rafts, life floats, and buoyant apparatus required. 75.10-10 Requirements for vessels in ocean service. 75.10-15 Requirements for vessels in coastwise service. 75.10-20 Requirements for vessels in Great Lakes; lakes, bays and sounds; or river service. Distribution, stowage, and notices. 75.40-90 Vessels contracted for prior to November 19, 1952. Subpart 75.43-Ring Life Buoys and Water Lights 75.43-1 75.43-5 Application. General. 75.43-10 Number required. 75.43-15 75.43-90 Distribution and securing. Vessels contracted for prior to November 19, 1952. Subpart 75.45-Line-Throwing Appliances 75.45-1 75.45-5 Application. General. 75.45-10 Type required. 75.45-15 Equipment for line-throwing ap 75.45-20 pliances. Accessibility. 75.20-5 Application. General. 75.20-10 Required equipment for lifeboats. 75.20-15 Description of equipment for lifeboats. Vessels contracted for prior to Subpart 75.50-Embarkation Aids Application. 75.90-1 75.90-5 Application. Vessels in ocean or coastwise service. 75.90-10 Vessels in Great Lakes service. AUTHORITY: §§ 75.01-1 to 75.90-10 issued under R. S. 4405, as amended, 4462, as amended; 46 U. S. C. 375, 416. Interpret or apply R. S. 4417, 4418, 4426, 4481, 4482, 4488, 4491, as amended, secs. 1, 2, 49 Stat. 1544, sec. 17, 54 Stat. 166, sec. 3, 54 Stat. 346, sec. 5, 55 Stat. 244, 245, as amended; 46 U. S. C. 391, 392, 404, 474, 475, 481, 489, 367, 526p, 1333, 50 U. S. C. App. 1275; E. O. 10402, 17 F. R. 9917; 3 CFR, 1952 Supp. SOURCE: § 75.01-1 to 75.90-10 contained in CGFR 52-43, 17 F. R. 9409, Oct. 18, 1952; CGFR 52-62, 17 F. R. 11877, Dec. 31, 1952. SUBPART 75.01-APPLICATION § 75.01-1 Details of application. Except as specifically noted, the provisions of this part shall apply to all vessels other than motorboats, and to all motorboats on an international voyage. Motorboats not on an international voyage shall meet the requirements of Subparts 75.01, 75.05, and 75.40. SUBPART 75.05-GENERAL PROVISIONS PERTAINING TO LIFESAVING EQUIPMENT § 75.05-1 Equipment of an approved type. (a) Where equipment in this part is required to be of an approved type, such equipment requires the specific approval of the Commandant. Such approvals are published in the FEDERAL REGISTER, and in addition, are contained in Coast Guard publication CG-190, "Equipment Lists for Merchant Vessels." (b) Specifications for many of the items required to be of an approved type have been promulgated and are contained in Subchapter Q (Specifications) of this chapter. In general, such specifications are of interest only to the manufacturer of specific items of equipment. $ 75.05-5 Equipment installed but not required. Where items of lifesaving equipment are not required, but are installed, such equipment and its installation shall meet the requirements of this part. SUBPART 75.10 LIFEBOATS, LIFE RAFTS, LIFE FLOATS, AND BUOYANT APPARATUS § 75.10-1 Application. (a) The provisions of this subpart, with the exception of § 75.10-90, shall apply to all vessels contracted for on or after November 19, 1952. Vessels contracted for prior to November 19, 1952, shall meet the requirements of § 75.10-90. § 75.10-5 Type of lifeboats, life rafts, life floats, and buoyant apparatus required (a) Lifeboats. (1) All lifeboats shall be of an approved type, constructed in accordance with Subpart 160.035 of Subchapter Q (Specifications) of this chapter. (2) All lifeboats certified to carry 60 or more persons shall be either motorpropelled of Class A or Class B, or shall be fitted with an approved type of handpropelling gear. (3) Class A motor-propelled lifeboats shall be fitted with a compression-ignition engine, a radio cabin and a radio installation complying with the requirements of the Federal Communications Commission, and a searchlight constructed in accordance with Subpart 161.006 of Subchapter Q (Specifications of this chapter. (4) Class B motor-propelled lifeboats need not have an engine of the compression-ignition type or a radio or searchlight as required by subparagraph (3) of this paragraph. (5) All lifeboats, except those installed on vessels in river service, shall be fitted with suitable disengaging apparatus consisting of fixed hooks in the lifeboat or mechanical disengaging apparatus. Mechanical disengaging apparatus if fitted, shall be of an approved type, constructed in accordance with Subpart 160.033 of Subchapter Q (Specifications of this chapter. (i) All lifeboats installed on ocean or coastwise vessels of over 3,000 gross tons shall be fitted with mechanical disengaging apparatus so arranged as to make it possible for the lifeboats to be launched with their full complement of persons and equipment while such vessels are underway or stopped, and for both ends of the lifeboat to be released simultaneously, under tension or not, by one person. Simultaneous release shall be effected by partially rotating a shaft which shall be continuous and extend from points of contact with the hooks. (ii) All lifeboats installed on any particular vessel shall be fitted with the same type of releasing gear. (b) Life rafts. (1) All life rafts shall be of an approved type, constructed in acordance with Subpart 160.018 of Subchapter Q (Specifications) of this chapter. Type A life rafts shall be stowed on the standard life raft skids required by § 75.15-10 (c) (1) unless specifically noted otherwise. (c) Life floats. (1) All life floats shall be of an approved type, constructed in accordance with Subpart 160.027 of Subchapter Q (Specifications) of this chapter. (d) Buoyant apparatus. (1) All buoyant apparatus shall be of an approved type, constructed in accordance with Subpart 160.010 of Subchapter Q (Specifications) of this chapter. § 75.10-10 Requirements for vessels in ocean service—(a) Lifeboats. (1) All vessels shall be provided with sufficient lifeboats to accommodate all persons aboard. (2) Lifeboats shall be not less than 24 feet in length, except where owing to the size of the vessel, or for other reasons, the Commandant considers the carriage of such lifeboats to be unreasonable or impracticable. However, in no case shall lifeboats be less than 16 feet in length. (3) Emergency lifeboats: One of the lifeboats on each side of the vessel shall be of suitable size and design for performing emergency work at sea. Such lifeboats shall be normally not more than 26 feet in length and the ratio of length to beam shall be not less than 3.3. (4) The minimum number of motorpropelled and hand-propelled lifeboats to be carried shall be as given in Table 75.10-10 (a) (4). vided with buoyant apparatus sufficient to accommodate 25 percent of all persons on board. Life floats not weighing more than 400 pounds or type A life rafts may be substituted for the buoyant apparatus required. § 75.10-15 Requirements for vessels in coastwise service. (a) Except as further modified by paragraph (b) of this section, all other vessels to which this section pertains shall be provided with sufficient lifeboats and type A life rafts to accommodate all persons on board. Not less than 75 percent of the total capacity shall be in lifeboats and the remainder may be in life rafts. Such lifeboats shall have a length of at least 16 feet unless otherwise specifically permitted by the Officer in Charge, Marine Inspection, in cases where the crew is insufficient to properly handle lifeboats of such size or where there is insufficient space to properly stow such lifeboats. (b) In the case of motor vessels of less than 300 gross tons and not on an international voyage, if in the opinion of the Commandant it is unreasonable or impracticable to meet the requirements of paragraph (a) of this section, due to the size and arrangement of the vessel and its intended service, the Commandant may prescribe the size, capacity, and number of lifeboats or other boats of suitable design and construction, life rafts, life floats, and/or buoyant apparatus to be carried as in his opinion is reasonable and practicable. In any case, there shall be sufficient total capacity for all persons on board. § 75.10-20 Requirements for vessels in Great Lakes; lakes, bays and sounds; or river service. (a) All vessels other than ferryboats and passenger barges shall be provided with lifeboats, life rafts, and life floats as required by Table 75.10-20 (a), except as specifically noted in this paragraph. (1) Motor vessels of less than 50 gross tons, navigating in daylight only, need not be fitted with lifeboats, life rafts, or life floats, provided: (i) Such vessels are fitted with sufficient air tanks under the deck that the vessel, in its loaded condition, will remain afloat when full of water; or (ii) Such vessels are fitted with sufficient bulkheads that the vessel, in its loaded condition, will remain afloat with any two compartments damaged. Page 497 |