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Equipment Used Afloat, Ashore Swinging Furnace Front — Pressure Regulacng or Reducing Valves—New Method of Cleaning Boilers—Welding Generator NEW type of swing furnace front has recently been developed by the Bethlehem Shipbuilding Corp., Ltd., Bethlehem, Pa., for use in installa- tions of its mechanical oil burning systems, known as the Dahl _ type, which are manufactured at its Moore plant, Elizabeth; N° J. This front is suitable for use with either natural or forced draft, or with’ a combination of both. The swinging feature of the new front, in addition to retaining all of the desirable fea- tures of the nonswinging type, pos- sesses special advantages in regard to accessibility and air regulation. The air register is a _ substantial cylindrical casting having nine air vanes cast intergral with two flanges of rug- ged design, the front one of which acts as a support for the swinging part, the rear one being bolted to the boiler furnace front. A cylindrical regulating pot air check governs the amount of air admitted by opening and closing the air inlet. The air regulating pot is controlled by means of a hand operat- ed rack and pinion. The cylindrical air regulating pot and air regulation pot head are sep- arate castings, clamped together by two cogs. The air controlling gear and cone adjusting gear are the same in both swinging and nonswinging types. The swinging front permits of air regulation when working under natural draft, forced draft, or combined natural and forced draft, and under all. condi- tions of operation, it may be swung open to permit of easy access to the furnace interior without dismantling any part of the boiler front. When working on natural draft installation, the cylindrical air regulating pot, and air regulation pot head are one cast- ing. Regulation of the air is accom- plished by adjusting the air regula- tion pot. In this case, the air is ad- mitted through the register vanes which are open to the boiler room. Ease of Inspection Withdrawing the pot and pot head along a cylindrical bracket placed in the center of the crossbar, by means of the rack and pinion, and swinging them open, permits of inspection and easy access to the interior of the fur- naces without dismantling the boiler front or fuel oil piping. When operating under forced draft, the register is enclosed by the air duct, and adjustment for air control is by means of the rack and pinion which op- erates the air regulating pot and pot head. Closing the air regulating pot over the register vanes, cuts off the forced draft and permits of swinging the air regulating pot head, burner, and regulating cone clear of the reg- ister for inspection without destroying draft conditions on other furnaces be- ing supplied from the same duct. The swinging clear of the pot head and door frame permits of inspection and access to the furnaces without dis- mantling the furnace front or fuel oil piping. To do this, the two dogs are thrown clear of: the air regulating pot, the latch bolt is disconnected and the air regulation pot head is with- drawn from the air regulating pot. While these various movements are taking place, the air regulating pot seals the register thus preventing leak- age of air during examination of the burner and regulating cone. When working under natural draft on a combined forced and natural draft installation, the air regulation pot re- mains in the closed position shown in Fig. 2 of the accompanying _ illustra- FIG, 1—FIRE ROOM OF AMERICAN LINER PAN AMERICA SHOWING BOILERS WITH BETHLEHEM OIL-BURNING SYSTEM 236