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German Marine Industry (continued) VOITH Circle 3 on Reader Service Card J.M. Voith, GmbH, headquar- tered in Heidenheim, is one of the leading German manufacturers of heavy machinery, with worldwide production facilities, including the U.S. Its main products, in addition to the well-known Voith-Schneider propeller (VSP), are paper ma- chines and equipment for pulp preparation, large water turbines and pumps for hydropower and storage power stations, power trans- missions, torque converters, hydro- dynamic couplings, reduction gears, fully automatic gears, cardan shafts, etc. The VSP is a vertical-axis propel- ler for the highest degree of reliable maneuverability. Pitch is controlled by two independent coordinates (hydraulic rams)—one for the longi- tudinal, the other for the transverse ship axis. This guarantees very sim- ple and precise handling of ships equipped with the VSP. Extremely low rpm (only about one-quarter of a comparable screw propeller) and highest quality of forged chrome- nickel steel blades result in a very rugged and reliable shipboard ma- chine, highly resilient against im- pact with floating debris. Voith-Schneider propellers are used wherever high and precise ma- neuverability is required. Typical applications are: Voith Water Tractors—a tugboat concept developed by Voith—with highest shiphandling capabilities and safety. There are some 500 Voith Water Tractors now in opera- tion in 95 harbors worldwide. Double-ended ferryboats, with one propeller forward and one aft. They are not only highly maneuver- able but also can compensate with their propellers against strong side winds and currents when safe and precise entering into terminals is required. About 300 VSP-equipped ferries, on most major routes, are operating worldwide. Two of the most recent to enter service are the ferries built by Robert E. Derecktor shipyard for the City of New York's Department of Transportation. With a passenger capacity of 1,200 each, their primary use is for off- peak passenger-only travel between Manhattan and Staten Island. For minehunting vessels, VSPs are used as main and auxiliary drive and steering device all in one for cruising, precise position-keeping, and maneuvering with low under- water noise signature during mine- hunting between zero and seven knots. With these vessels, the pro- pellers are arranged side-by-side astern. Riva Calzoni S.p.A. - Via Stendhal, 34 - 20144 MILAN (Italy) - tel. 2/479151 - telex 332292 RI VAT I - telefax 2/425749 Circle 254 on Reader Service Card The E-VAC sewage ejector now makes a holding system the sensible choice. sewage «iec»or | atmospheric holding 4 tank .I Mm wall deck mount mount recirculating rump low volume fresh water flush toilet (2 pints/flush)... 10 man crew produces 15 gals, of sewage per day small diameter piping... 1-1/2" and 2" piping layout flexibility...with vertical lift reduced holding tank size...80% smaller system components can be adapted to utilize ship's hull tanks where space is limited toilet vents eliminated ENVIROVAC INC. 1260 Turret Drive Rockford, IL 61111 U S A 815/654-8300. Telex 257-415 Toll Free 800-435-6951 (except IL. HI. AK) 7036-30 Street S.E.. Calgary. Alberta, T2C 1N9 Canada 403/279-2669. Telex 03-821885 Toll Free 800-661-3161 Circle 189 on Reader Service Card 64 WESTFALIA Circle 5 on Reader Service Card Westfalia Separator AG of Oelde/ Westfalia, West Germany, designs and manufactures equipment and systems for every oil purification need. Westfalia products are mar- keted in the U.S. by Centrico, Inc. of Northvale, N.J. Centrico provides expertise to help design, install, and service Westfalia equipment. Skilled engineering advice and as- sistance, as well as parts, are usually available overnight at any port on the Atlantic, Pacific, or Gulf Coasts. Westfalia oil purifiers are avail- able as single machines or as pre- assembled "Centri-Pack" modules, with heaters, pumps, strainers, con- trols, wiring, etc., installed and ready to go. Westfalia systems allow monitoring of such vital functions as oil flow, oil temperature, increased water discharge, oil break-over, fail- ure to shoot, motor temperature, vibration, and excessive number of second-stage solids or water dis- charges. Control stations, with audi- ble and visual alarms, can be located remotely and/or at the equipment. Westfalia oil-purifying centri- fuges, including the automatic, self- cleaning model OSA 20 and the take-down OTB 2 version, are being increasingly specified by diesel en- gine manufacturers and shipbuild- ers for workboats, service vessels, and offshore platforms. By removing water solid fines and other impurities from heavy fuel oil, Westfalia purifiers permit efficient combustion of the low-cost grades of fuel. Put to work eliminating similar contaminants from lube oils, they also enable operators to recycle lube oils, thus forestalling premature en- gine wear and reducing downtime, as well as extending lube oil life. Westfalia OSA models are espe- cially suitable for automatic, contin- uous operation. They incorporate self-cleaning, disc type bowls de- signed for optimum oil-water sepa- ration even when oil characteristics and feed rates change. OSA models are available with maximum rated capacities of 5,500 gph, but actual throughput depends on viscosity, specific gravity, and other proper- ties of the oil. Westfalia OTB take-down oil purifiers are designed for de- watering and removal of solid impu- rities from fuel and lube oils. They are currently in use on many off- shore service vessels in the Gulf of Mexico area, and on other work- boats throughout the world. ZF Circle 4 on Reader Service Card Zahnradfabrik Friedrichshafen AG of Friedrichshafen, West Ger- many, offers an attractive color bro- chure describing its ZF marine transmission systems. The 16-page publication is arranged in seven double-page sections. ZF marine gearboxes, used by eight of the 10 West European nav- ies on their fast craft, incorporate the comprehensive experience de- Maritime Reporter/Engineering News CALZONI 150 years of experience in hydraulics lete with disconnecting clutch
