Hull Structure The hull is framed longitudinally, except that the peaks, forward deep tanks, double bottoms, after portion of the machinery space, and the forecastle and poop are transversely framed. In cargo tanks Nos. 2 and 9 inclusive the spacing of transverses is 9’-10”; in No. 1 tank the spacing is 10'-2", 10’-0" and 10’-2”; in No. 10 it is 9’-0". The cargo space is 577’-6" long, which is 63.9 percent of the L.B.P. This permits of a good longitudinal distribution of the cargo. , The hull is all-welded except for the following: On each side of the ship two deck seams, the deck stringer angle, the lower sheer strake seam, the upper and lower seams of the bilge strake, and the seam of flat keel to garboard, are riveted from the vicinity of the forward cofferdam to the vicinity of the wing bunker tanks. Angle connections of two side keelsons and one deck girder each side are also riveted to the shell and deck respectively, for about the same length as the seams. All shell and upper deck plating 1/3" thick and over is of the special chemical quality steel which, although not a requirement of American Bureau at the time the construction contract was signed, became a requirement of their revised Rules issued in 1948. The welded seams and butts of shell and deck plating are low-temperature stress-relieved during construction. The vessels have the usual twin longitudinal bulkheads. The main transverse and longitudinal bulkheads are of flatplate stiffened construction. The top strake of each of these is increased in thickness 0.06" for longitudinal bulkheads and 0.l8" for transverse bulkheads over Rule requirements, and the strake below is likewise increased 0.08” in both cases. PACKAGE FREIGHT CAPACITY. CENTER CARGO TANKS & WING CARGO TANKS. FUEL OIL TANKS. DIESEL OIL TANK. FRESH WATER TANKS & DRINKING WATER BALLAST TANKS AND COFFERDAMS When the vessel is loaded to summer draft amidships in salt water, with all cargo tanks 98 per cent full of gasoline cargo of 6l.2° A.P.I., with 858 tons of bunker fuel in the after tanks, with 125 tons of fresh water in after tanks, and with 75 tons of stores on board, the still water condition shows a trim by the head of about 41,”. For a loading, in the trough of the standard wave, the estimated deck stress for sagging is 19,674 p.s.i. when loaded to summer draft, all cargo tanks filled with 65° gasoline, 610 tons of bunker fuel aft and 200 tons in No. 1 fore deep, 438 tons of fresh water aft, and 65 tons of stores, etc. See also : The 27,000-Ton Supertanker - Part 4