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ucts on the U.S. East Coast, and Marine Propulsion to provide in- stallation and maintenance services for NETEC in the Gulf Coast region. NETEC sports a product line which includes: capstans; wind- lasses; winches for mooring, towing, anchoring and oceanographic re- search; and power units powered by electricity, hydraulics and diesel. Marine Propulsion is the exclu- sive U.S. representative of Schottel propulsion equipment and Lohmann & Stolterfoht gears. In addition, the company handles PP Jet water jets, Solo controls and Capital Gears. For more information on New En- gland Trawler, Circle 93 on Reader Service Card For information on Marine Pro- pulsion, Circle 94 on Reader Service Card How to Operate More Efficiently At Lower Cost With Tranter Plate -type Heat Exchangers HEAT RECOVERY FROM CONDENSATE CONDENSATE HEATING RECOVERED OIL STEAM HEATED TANK FOR BANK RECOVERED OIL SPILLS CENTRAL FRESH WATER COOLER SEAWATER SEAWATER OR FRESH WATER SUPERCHANGER UNIT TO VARIOUS USE POINTS FRESH WATER STORAGE TANK SUPERCHANGER UNIT report from a ship to, for example, a news bureau. In interactive mode, when questions are being asked by a shore-based commentator, the ana- logue voice grade return channel is utilized. The lower quality of this channel is not important since the listeners will hear the voice of the commenta- tor in the studio. This has mainly been used on land, by journalists for example. The same facility also makes it possible to transmit Hi-Fi Audio to cruise ships for entertain- ment. Compressed Video and Audio HSD video transmissions (from ship to shore) operates identically to the High Quality Audio application, with the camera replacing the microphone and video codes replacing the audio codes. Potential applications include remote materials and equipment inspection, damage assessment and co-operative decision making. With the DHSD service it is pos- sible to set-up real-time video conferencing. Also, the audio channel is included in the same bitstream, leaving 48 kbps for the video information when 16 kbps audio compression is ap- plied. Further technological im- provements are expected, and the price and the size of video codes are now decreasing. Of course, the DHSD link can also be used as a 64 kbps data chan- nel to provide high speed data com- munications, to transfer large quan- tities of data in both directions, an application of special interest to re- search and seismic vessels, offshore platforms and passenger ships. Another application is using the DHSD link as a multiplexed chan- nel, thereby offering a number of digitized voice, facsimile and data channels. It is attractive for cruise liners to be able to offer several telephony channels via one DHSD circuit. Following the successful demon- stration, the Marin-ABC project ends this year and will be followed up by the Moebius (Mobile Experi- mental Broadband Interconnection Using Satellites) project as part of the RACE II program. Moebius will build on the positive results of the Marin-ABC project and develop multi-media platforms for specific applications in the mari- time and land-mobile industries. The advantages of multimedia communications between ship and shore are numerous. On a basic level, savings in time, effort and money are most appar- ent. However, broadband commu- nications have the potential for a formidable range of other applica- tions that could affect the future of vessel management and mainte- nance practices. Advanced communications offer a vision of a future in which ship- board personnel will call upon shore support for a growing number of other areas where shoreside exper- tise is needed. For additional information on the new applications and services of Inmarsat-A, Circle 211 on Reader Service Card Marine Propulsion, New England Trawler Reach Marketing Agreement New England Trawler Equipment Co. (NETEC) of Chelsea, Mass., and Marine Propulsion, Inc., of Hammond, La., have entered into a marketing agreement. The agreement allows NETEC to represent Marine Propulsion prod- Naval ships, fleet oilers, commercial containerships, tankers and dredges are successfully finding new ways to operate more efficiently at lower cost, by utilizing Tranter's unsurpassed plate-type heat exchanger technology. Schematics presented here illustrate typical ways they are doing it. Superchanger® plate and frame heat exchangers are used in a wide variety of shipboard applications—particularly for cooling main engine jacket water and cooling main engine lube oil with fresh water or sea- water; cooling the ship's central fresh water; cooling electronic equipment; or recovering heat from condensate. They are far more effi- cient than tubular systems, and provide heat transfer coefficients from two to five times greater than those achieved by shell and tube units. They also require 10% to 50% less deck space and weigh up to one-sixth less. Superchanger units can be equipped with titanium plates which offer the best resistance to corrosion and erosion when exposed to seawater. Intermixing or cross-contamination of hot and cold liquids is virtually impossible. Low fouling rates reduce cleaning require- ments for Superchanger units, that are designed for easy maintenance. They can be cleaned-in-place by backflushing, or quickly disassembled by hand, cleaned and put back in operation. Platecoil® prime surface heat exchangers offer optimum temperature control. A Platecoil bank-in-tank unit provides wide interspaces for effectively passing solids while efficiently heating seawater containing oil from spills. Platecoil bayonet heaters provide a large amount of efficient primary heating surface in a single unit for maintaining desired temper- atures in storage tanks. These heaters help promote convection currents for better heat transfer rates and tank temperature uniformity. Platecoil suction heaters provide immediate heating for pumping oil out of tanks. Tranter plate-type heat exchangers can be supplied in full compliance with codes and specifications as required by the ABS; the U.S. Coast Guard; shock testing per MIL-S- Circle 251 on Reader Service Card 901C; vibration testing per MIL-STD-167-1; and ASME U stamp per Sec. VIII Div. 1. With over 50 years of heat transfer problem solving experience, Tranter is uniquely poised to answer your tough questions and solve your precise needs. Call us at (817) 723-7125. Better still, ask your local Tranter representative about our Heat Transfer Symposiums. ^^ The heat transfer answer. ^M^ranter PLATECOIL • SUPERCHANGER • FLEXOPLATE • KOLO-HOLD TRANTER, inc., Texas Division Old Burk Road • P.O. Box 2289 Wichita Falls TX 76307 • (817) 723-7125 TELEX: 73-4410 • FAX: (817) 723-5131 M MADE IN U.SA 01992 TRANTER, inc. 650101 December, 1992 55
