Line 1-Segregation of cargo from surrounding waters: 1=Skin of vessel (single skin) only required. Cargo tank wall can be vessel's hull. 11 Double skin required. Cargo tank wall cannot be vessel's hull. Line 2-Segregation of cargo space from machinery spaces and other spaces which have or could have a source of ignition: 1=Single bulkhead only required. Tank wall can be sole separating medium. Abbreviations used: Tank type: Ind=Independent. SR Safety relief. Gaging device: Restr. Restricted. Subpart 151.10-Barge Hull Construction Requirements § 151.10-1 Barge huil classifications. (a) Each barge constructed or converted in conformance with this subpart shall be assigned a hull type number. (1) Effective dates for certain requirements: (1) Barges constructed or converted between July 1, 1964, and June 1, 1970, in accordance with the construction requirements of § 32.63 of this chapter and § 98.03 of this chapter are considered to comply with the basic provisions of this subpart and shall retain the hull type classification for the service for which they were originally approved. Changes in product endorsement shall not be considered a change in service, except when a change to a product of higher specific gravity necessitates a reevaluation of the intact and damage stability requirements of 8 151.10-5 and 151.10-10. (b) For this purpose the barge hull types shall be defined as follows: (1) Type I barge hull. Barge hulls classed as Type I are those designed to carry products which require the maximum preventive measures to preclude the uncontrolled release of the cargo. These barges are required to meet standards of intact stability, § 151.10-5; a modified two-compartment standard of subdivision and damage stability, § 151.10-10; and hull structural requirements, including an assumed grounding condition. (2) Type I-S (special) barge hulls. Type I-S (special) barge hulls are those constructed or converted for the carriage of chlorine in bulk prior to July 1, 1964, and modified to higher stability standards prior to July 1, 1968, but not meeting the requirements for full Type I classification. (3) Type II barge hull. Barge hulls classed as Type II are those designed to carry products which require significant preventive measures to preclude the uncontrolled release of the cargo. These barges are required to meet standards of intact stability, § 151.10-5; a modified one-compartment standard of subdivision and damage stability, § 151.10-10; and hull structural requirements including an assumed grounding condition. (4) Type III barge hull. Barge hulls classed as Type III are those designed to carry products of sufficient hazard to require a moderate degree of control. These barges are required to meet standards of intact stability, § 151.10-5; and hull structural requirements. § 151.10-5 Intact transverse stability. (a) Except as provided in paragraph (b) of this section, the intact transverse stability for each barge up to the angle of maximum righting arm or angle of downflooding, whichever is less, must be at least (1) Five foot degrees for rivers; (2) Ten foot degrees for lakes, bays, sounds and the Great Lakes-summer (April 16-September 30); and (3) Fifteen foot degrees for oceans and the Great Lakes-winter (October 1April 15). (b) Unless otherwise required by the Commandant, for a barge whose vertical center of gravity for cargo is below the deck at side, the required transverse stability may be determined in terms of metacentric height in feet. The vessel must have at least minimum metacentric height (GM) as determined at any particular draft by the following formula: GM=kB |