THE Federal Shipbuilding Company is fast completing the five shelter-deck bulk oil tankers building for the Standard Oil Company of New Jersey. These tankers, while modern in every particular, are of a fairly well standardized type and arrangement and are chiefly interesting in that they represent first-class present practice in this type of vessel.     They are 516 feet 5 inches in overall length, 68 feet molded breadth, with a loaded summer draft of 28 feet 3/8 inch. The block coefficient is 0.803, the displacement tonnage 21,835. and the deadweight capacity in tons 15,320. The vessels are built on the longitudinal system to Lloyd’s 100 A-1 special survey.     They are powered with three sin-gle-ended Scotch boilers 16 feet in diameter, 11 feet 6 inches in length, arranged for oil fuel with forced draft, having a total heating surface of 9618 feet. The working pressure of the steam is 210 pounds. The normal fuel consumption per day in tons is estimated at 41.25. These boilers deliver steam to two 3-cylinder triple expansion reciprocating engines (2013 by 35 by 60 inch cylinders by 42 inch stroke), developing a normal horsepower of 3320 at 90 r. p. m. The normal fuel consumption per horsepower works out at 1.16 pounds.     The engines drive twin-screws of the built- up type with semi -steel hub and three bronze blades. These screws have a diameter of 15 feet, a pitch of 14 feet 2 inches, and propel the vessel at 11 1/2 knots an hour trial speed.     For auxiliary work one coal-burning donkey boiler is provided, designed for natural draft, and for steam at a working pressure of 180 pounds. This boiler has 1234 square feet of heating surface. Typical midship section of new Standard Oil tankers.     The hull is divided into ten main tanks, each tank 28 feet in length. There is a cargo hold forward 56 feet in length, and below it a deeptank for fuel oil. Aft of this cargo hold is No. 1 cofferdam; then follow three main cargo oil tanks; No. 2 cofferdam; three main cargo oil tanks; pump room; four more cargo oil tanks; cofferdam No. 3; fuel oil tank; cofferdam No. 4; and aft of cofferdam No. 4 the boiler and engine rooms.     As will be noted, in the midship section summer tanks are carried outboard of the expansion trunks. The total capacity of the ten main cargo oil tanks is 110,441 barrels. The total capacity of the six summer tanks is 11,014 barrels, giving a grand total on summer freeboard of 121,455. The cargo hold has a total cubic space of 75,514 cubic feet for grain and 67,983 cubic feet for baled cargo. The fuel oil tanks have a capacity for 12,488 barrels, giving at the trial a speed of 11 1/2  knots a cruising radius of 11,400 nautical miles.     The auxiliary equipment and machinery includes three steel pole masts, two steel derrick posts, three 5-ton booms, and two 3-ton booms, served by three steam winches. There is one double steam windlass 16 by 12, and one steam tiller with telemotor. For pumping cargo two 3000 barrel per hour steam driven compound horizontal duplex pumps are provided and one duplex drainage pump 10 by 6 1/2 by 16 inches with 6-inch auxiliary discharge.     The main tank suction consists of a 14-inch main line on each side of the center line bulkhead with 10-inch suction to each tank. This main line is cross-connected at the pump room. The main tank discharge consists of a 12-inch main on the port side extending from the pump room aft along the upper and shelter decks to abaft the end of the engine room casing.     Ample accommodations are provided for a crew of fifty-one men, with one spare stateroom, a fully equipped hospital, adequate electric light installation,refrigeration rooms for galley supplies, and e?icient fresh water, sanitary, and steam heating systems.