Coast Guard, DOT § 160.035–8

than 18 rivets per foot around all edges § 160.035–8 Construction of fibrous of the doubler plate. glass reinforced plastic (F.R.P.), (iii) Prior to riveting, the complete oar-, hand-, and motor-propelled surface between the shell plating and lifeboats. the doublers shall be treated with suit- (a) General requirements. (1) Plastic able insulating compounds. After rivet- lifeboats shall comply with the general ing the faying joints shall be caulked. requirements for the construction and (iv) All riveted seams and butt laps, arrangement of steel lifeboats, except laps of plating on the , gunwale, that unless otherwise specified, mate- and , shall be made over rials, scantlings, methods of construc- boundary bar tape such as: P.A.W. tion, fastenings, methods of attach- ment of component parts, and other tape, Trantex V-20 vinyl tape, EC–1202 specific construction details may be Butyl rubber tape, Alumilastic or suit- varied by the builder in order to able equivalent nonabsorbing mate- produce a structurally sound rials. In general the insulating tape meeting in every respect recognized 1 1 should be 1 ⁄4 to 1 ⁄2 inches in width. standards of first class construction Under no circumstances should red and one which will satisfactorily meet lead be applied nor should an absorbent the performance requirements set forth felt be used as tape in the riveted joint in this subpart. whether or not it is saturated with red (2) Fibrous glass reinforced plastic lead. lifeboats may be of the following cat- (h) Gunwales. (1) Dimensions of angu- egories of construction: lar gunwales shall be not less than that A—Single piece, outer hull construction. shown in Table 160.035–6. B—Two piece, outer hull construction. (2) Flanged plates made from flat C—Single piece, inner hull construction. bars, dimensions of which shall not be D—Two piece, inner hull construction. less than that shown in Table 160.035–6, E—Multi-piece, inner hull construction. may be substituted for angular (b) Specific requirements—(1) Resin. gunwales. The resin used shall be of the fire re- (i) Dissimilar metals. (1) Where in the tardant, nonair inhibited-type con- construction of aluminum lifeboats the forming to Class A of Military Speci- use of dissimilar metals are employed fication MIL–R–21607 and Grade A, such as, the installation of the me- Class O of Military Specification MIL– chanical disengaging gear, hand propel- R–7575, including tests after 1 year’s ling gear, or engine, suitable insulation weathering. In addition, the test panels between the aluminum and these met- shall be tested for continued conform- als shall be used. Porous or absorbent ance with Military Specification MIL– materials shall not be used as insulat- R–21607. All tests, including weathering ing materials. Only non-porous mate- of samples, shall be accomplished by an rials such as plastics, rubber or neo- independent laboratory. Complete cer- tification by the independent labora- prene base compounds, or micarta shall tory with test data shall be submitted be used. Other suitable material will be to Coast Guard (G–MSE) for accept- given separate consideration. Fasten- ance. Class A resin shall be fire retard- ers used in joining dissimilar metals ant without additives. Class B resins together shall be of the type that will will be given consideration upon re- minimize corrosion. quest. Class B resin shall be fire retard- ant with additives and shall meet the § 160.035–7 Construction of wood oar-, same test requirements as that for hand-, and motor-propelled life- Class A resins. When Class B resin is . used for the prototype lifeboat, addi- (a) Wooden lifeboats are prohibited tives for fire retardancy shall not be on tank vessels. No specification re- used in order to obtain a translucent quirements for new construction are in laminate for inspection purposes. This effect at this time. prototype test lifeboat will not be

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stamped approved, nor will it be ac- brous glass reinforced plastic in the ceptable for merchant vessels. Which- production F.R.P. lifeboat shall be ever class of resin the manufacturer de- within 5 percent. This weight shall be cides to use for his prototype lifeboat, for the F.R.P. sections only and shall shall be used in his production life- not include the weight of any hardware boats. A note to this effect shall be in- or equipment. cluded in his specifications and draw- (ii) When assembling two similar sec- ings for this particular size and type tions as indicated by categories B and lifeboat. D of paragraph (a)(2) of this section, (2) Glass reinforcement. The glass rein- the weights of the matching F.R.P. forcement used shall have good lami- pieces shall be within 5 percent of each nated wet strength retention and shall other. meet the appropriate military speci- fication stated in this paragraph. Glass (iii) The recorded weights of the cloth shall meet Military Specification items indicated in paragraphs (b)(4) (i) MIL–Y–1140, Class C, form 4, No. 1000– and (ii) of this section shall be kept by 150. Woven roving shall conform to the manufacturer, with each boat list- Military Specification MIL–C–19663, ed by size, type, and serial number. Style 605–308 or Style 605–604. Other [CGFR 65–9, 30 FR 11467, Sept. 8, 1965, as glass materials equivalent in strength, amended by CGD 72–133R, 37 FR 17039, Aug. design, wet out, and efficiency will be 24, 1972; CGD 82–063b, 48 FR 4782, Feb. 3, 1983; given consideration upon request. CGD 95–072, 60 FR 50467, Sept. 29, 1995; CGD (3) Laminate. All exposed surfaces of 96–041, 61 FR 50733, Sept. 27, 1996] the finished laminate shall present a smooth finish, and there shall be no § 160.035–9 Cubic capacity of lifeboats. protruding surface fibers, open voids, (a) Definitions. The following defini- pits, cracks, bubbles or blisters. The tions apply to the measurement of a laminate shall be essentially free from lifeboat to determine its cubic capac- resin-starved or overimpregnated ity. areas, and no foreign matter shall re- main in the finished laminate. The en- (1) Length (L). The length is the dis- tire laminate shall be fully cured and tance in feet from the inside of the free of tackiness, and shall show no plating or planking at the stem to the tendency to delaminate, peel, or craze corresponding position at the . In in any overlay. The laminate shall not the case of a boat with a square stern, be released from the mold until a the after terminus is the inside of the Barcol hardness reading of not less . than 40–55 is obtained from at least 10 (2) Breadth (B). The breadth is the places on the nongel coated surface, in- distance in feet over the plating or cluding all interior inner and outer planking at the point where the hull surfaces and built-in lockers. The breadth of the boat is greatest. mechanical properties of the laminate (3) Depth (D). The depth is the dis- shall meet the requirements for a tance in feet amidships inside the plat- Grade 3 laminate as specified in Table ing from the of the keel to the level I of Military Specification MIL–P– of the gunwale. The depth used for cal- 17549. Other grades will be given con- culating purposes shall not exceed 45 sideration on specific request. For the percent of the breadth. prototype boat of each design made by (4) Sheer. Lifeboats shall have a sheer each manufacturer, the layup shall be at each end at least equal to 4 percent made of unpigmented clear resins so of the length, and a sheer at the quar- that all details of construction will be visible for inspection and test panels ter points of at least 1 percent of the representative of each prototype layup length. If less sheer is provided, the shall be tested in accordance with depth used to determine the cubic ca- MIL–P–17549. pacity shall be assumed to be reduced (4) Weights of F.R.P. lifeboats. (i) The so as to achieve this minimum sheer. variations in weight between the fi- (b) Formula. The cubic capacity shall brous glass reinforced plastic in the be determined by the following for- prototype F.R.P. lifeboat and the fi- mula:

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