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-- Suction Dredge ~ New Orleans The First Dredge of the Fruhling Type to be Employed by the Corps of Engineers. Its Novelty Lies in the Type of Head. Intended for Use in Southwest Pass. This Type of Dredge has met with ~ much Success in Other Parts of the World HE New Orleans is a large steel, GL Ghtddew suction dredge of novel type, designed for use in the south- west' pass of the Mississippi river. This dredge was built for the United States corps of engineers, war de- partment, and is of the Fruhling suc- tion head type, so successfully used in "urope and Canada, where dredg- ing conditions are similar to those THE MARINE REVIEW: 7 ¢ March, 1912 . STERN VIEW, SHOWING DrepceE HEAD coal bunker capacity, 300 tons; speed loaded, 10 kncts. The most novel feature of the dredge is the type of head, which was described in THE MARINE REVIEW, Jan- ary, "1912. "it is practically "a: huge enclosed rake, some 18 ft. wide by 5 ft. fore and aft, serrated along the edge with sharp cutting teeth through the incisors of which is ejected high THe New Orteans Drepcinc SAND, ON TRIAL OFF PROVINCETOWN of the Mississippi passes, and is of the following dimensions: Length. over. all. (not. including dredge head), 315 ft.; Length between perpendiculars, 300 ft.; breadth mold- ed, 50 ft.; depth molded, 26 ft.; length of hopper, 93 ft. 9 in.; capacity of hop- per, 3,000 cu. yds.; maximum dredging depth, 50 ft.; minimum dredging depth, 21 ft.; draught loaded, 20 ft.; pressure water to aid in disintegrat- ine the spoil and. make it of suitable consistency to be sucked through duplicate suction pipes into the pumps from which it is deposited in either of the ten hoppers. These hoppers have a combined capacity of 3,027 cu. yds., or approximately 3,000 tons, and can he filled under favorable condi- tions in the remarkably short space of 20 minutes. The dredged material] may then be transported by: the ves- sel to any convenient dumping ground at @ Speed of 10 knots per hour, when by the manipulation of four hydraulic ram mechanisms the hopper doors, 20 in number, and opening outwardly through the ship's bottom. may be operated either individually or simuitaneously for .dischars- ing. should # be | desired ~ to utilize the dredged material for reclamation work, a swivel deck dis- charging pipe has been installed, to which the necessary lengths of shore piping may be. coupled, and through this pipe the dredge can discharge her own cargo by sucking it from the hoppers and ejecting it to any location desired, or, as a third alterna- tive, into scows or other hoppers alongside. The machinery consists of four sets of triple-expansion, inverted, marine type.engines, arranged in pairs, tan- dem, and built on common bedplates. The two after sets of these main en- gines are coupled together to the propeller shafting and the two for- ward sets to the 26-in. centrifugal pumps used for dredging. By an in- genious arrangement of clutches, the propelling and pumping engines cay be coupled together so that the full power of all four engines can be ex- erted on the twin propellers when de- sired, while when dredging, the after sets will be free to drive the propellers and the forward sets will drive the dredging pumps, steam being supplied by four Babcock & Wilcox Co.'s boil- ers, The New Orleans furnishes com- fortable and commodicus quarters for its' crew. The captain, inspector and first mate are berthed in a large deck