Sparrows Point Launches "A. C. Rubel".     An important addition was made to the rapidly growing fleet of American tankers when the A. C. Rubel was launched Nov. 10 at the Sparrows Point Yard of Bethlehem Steel Company, Shipbuilding Division. The new vessel, the keel of which was laid on June 18, 1941, is being built for the Union Oil Company of California, and will be used in regular service on the Pacific Coast. She is named for a vice president of Union Oil, and Mrs. Albert C. Rubel, his wife, acted as sponsor.     The fourth tanker built for Union Oil at the Sparrows Point Yard, she has a deadweight of about 13,000 tons and a tank capacity of 103,445 barrels, or 4,344,ó90 gallons of oil. The cargo tank space is dívided into 24 compartments, allowing many grades of oil to be carried at one time. Pumping capacity is designed to load or unload the vessel in less than 12 hours.     The principal dimensions are as follows: Length overall, 463 feet. Molded beam, 64 feet. Molded depth, 34 ft. 10 in. Draft, 28 ft. 6 in. Speed, 13 knots. Two water tube boilers supply steam at 450 psi to a cross-compound, double-reduction gear Bethlehem turbine, developing 3500 shp and driving the single screw.