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Marine Lubricants (continued) tives to reduce engine wear rates, corrosion inhibitors to control the tendency of critical parts to corrode, pour point depressants to reduce the tendency for the oil to solidify at low temperatures, and antifoam ad- ditives to reduce oil foaming on air- entrainment characteristics. EXXON Circle 37 on Reader Service Card The Exxmar™ line of marine lu- bricants for crosshead and trunk piston diesel engines is the latest generation of superior quality prod- ucts to be developed by Exxon Cor- poration. Lubrication properties such as wear reduction, cylinder cleanliness, load carrying capacity and retention of alkalinity in the presence of water contamination have all been greatly enhanced. The Exxmar products surpass the al- ready high performance level of the successful Tro-Mar™ marine lubri- cants which this line replaces. The Exxmar lubricants will meet the challenges of increasingly harsh operating environments in marine diesel engines, including higher operating temperatures and pres- sures as well as the use of lower quality fuels. Field testing of these lubricants in the latest generation of diesel engines showed significant improve- ments in wear performance over the corresponding Tro-Mar products. Review of operators performance data of the past eight months also supports reduced wear rates and im- proved engine cleanliness. In cross- head engines, wear of cylinder liners and piston rings was reduced on average by one third in MAN B&W MCE and Sulzer RTA and RLB type engines. These reductions were recorded over a total period of 26,000 hours of testing. In trunk piston diesel engines, an even greater reduction in wear was recorded with piston ring wear halved in a Pielstick PC 2-6 engine. The Exxmar trunk piston lubricants were also shown to be capable of almost complete (96 percent) reten- tion of their alkalinity (TBN) when subjected to continuous addition of water. Enhanced system cleanliness and piston deposit control is achieved in both crosshead and trunk piston en- gines when using Exxmar oils. The high standards of cleanliness and the superior wear control make it possible to extend engine mainte- nance periods and provide ship operators with an opportunity to realize cost savings. For crosshead engine cylinders, a 70 TBN oil of outstanding perform- ance is offered as the main grade for high maximum pressures and high stroke-to-bore ratio engines. At the same time, for less highly rated engines of earlier vintages, the cus- tomer has the choice of a more eco- nomic 60 TBN cylinder oil. A higher TBN (90) and viscosity oil is avail- able for operational conditions where such an oil is required by the engine builder. For trunk piston engines, high performance 30 and 40 TBN oils are offered for all highly rated engines in severe service. For customers' convenience, a more economic 12 and 24 TBN oil will continue to be available for applications where a lower TBN lubricant is suitable. The new Exxmar line of products is the result of expertise with formu- lating marine oils acquired over many years and reinforces the long- standing tradition of Exxon service to the world's shipping industry. Most importantly, Exxmar products are being made available worldwide without an increase in cost to the shipowner. In addition to the Exxmar prod- uct line, several synthetic products are also available: Synesstic™, Syn- thetic Spartan™ and Polyrex™ Grease, which all provide the lubri- cating benefits of improved operat- ing efficiency, extended drain inter- vals and decreased maintenance. MOBIL Circle 38 on Reader Service Card Mobil Oil Corporation has a worldwide network of marine lubri- cant supply and service points and a long-standing, worldwide lubricant uniformity and availability. In addi- tion, Mobil offers a complete engi- neered analysis program called Progressive Fast Analysis (PFA) for marine main and auxiliary diessel engines. This engineered analysis program provides a trend analysis of diesel engine oils, on-site evaluation and follow-up, and a new data base of oil analysis results used for more indepth interpretation of analysis vs. equipment make and model, lu- bricant or fuel in use, contaminants, etc. Trend analysis and interpreta- tion information are reported with periodic service reports or by inqui- ry. The Mobilgard series of marine engine oils includes Mobilgard 570, a quality marine diesel engine cylin- der oil formulated to provide out- standing performance in high-out- put crosshead engines with brake mean effective pressures (BMEP) of 14 to 17 bar. These highly loaded crosshead diesels operate on heavy fuel oil with high sulfur content in order to reduce operating costs. Concurrently, advances in engine thermodynamics have permitted decreases in specific fuel consump- tion from 155 to 125 per bhp-hour. These changes in engine design for greater fuel efficiency, the use of higher viscosity residual fuels, and the need for reduced maintenance have increased the requirements on crosshead cylinder oil. Mobilgard 570 was developed to provide high load-carrying charac- TEL. (415) 522-8326 FAX NO. (415) 522-3136 2900 Main Street Alameda, CA Measuring Instrument Calibration Instrument Calibration Instrumentation & Controls Low Voltage Switchgear Computerized Engraving—Label Plates Photo Etching A unit of Todd Shipyards Corp., Seattle, WA. Circle 307 on Reader Service Card ZIDELL MARINE GROUP Specializing in I Water Transportation of General Cargo, Chemicals and Bulk Petroleum I Sales, Charters and Brokerage of Marine Equipment and Vessels I Vessel Design, Construction and Repair 3121 SW Moody Avenue, Portland, Oregon 97201 (503) 228-8691 /(800) 547-9259 RCA Telex 283985 FAX: (503) 228-6750 Ask for Bill Gobel or Jack Breshears FERNSTRUM r?D When lives depend on your boat's reliability... Don't take a W chance on your W cooling system. Crockett W & McConnell use Fernstrum W. _ GRIDCOOLERS to keep their V search and rescue crafts always ready, w Fernstrum GRIDCOOLERS are com- jf pletely assembled and factory tested to jf assure dependable service. Fernstrum j) GRIDCOOLERS are available in copper- J; nickel 90/10 and 5000 series aluminum. :J) TO CONTACT US: JJ R. W. FERNSTRUM & COMPANY d) MENOMINEE, MICHIGAN, U.S.A. 49858 jf «r» •• -s^x^^mm Phone: (906) 863-5553 • Telex: 26-3493 "j ^agjj "**SS55i Answer Back: FERNSTRUM MNOM Jjj Circle 165 on Reader Service Card MCELROY DECK EQUIPMENT ENGINEERED TO PERFORM ENGINEERED TO LAST P.O. BOX 4454 BILOXI. MISSISSIPPI 39535-4454 (601)896-3736 TELEFAX: (601)896-0874 1-800-634-6478 WINDLASSES McElroy stands ready to engineer, design, and quickly deliver any type deck equipment your requirements call for. CAPSTANS V5£ CORPORATION SINCE 1959 2,300 Employees, 30 Offices Nationwide MARINE DESIGN SERVICES MASTER ORDNANCE REPAIR CERTIFIED Join the professional marine design staff that keeps growing. You may qualify based on your experience and education in the following areas: • NAVAL ENGINEERING • NAVAL ARCHITECTURE • COMBAT SYSTEMS • COMPUTER AIDED DESIGN SERVICES • MACHINERY CONDITION ANALYSIS • MACHINERY VIBRATION ANALYSIS LOGISTIC SUPPORT SERVICES DIVER'S LIFE SUPPORT SYSTEMS OVERHAUL PLANNING SERVICES SHIP'S SELECTED RECORD SERVICES Competitve salary and benefits Please send resume or call our Employment Office for consideration 1417 N. Battlefield Blvd. Chesapeake. Virginia 23320 (804)547-8556 EOE M/F/V/H Circle 178 on Reader Service Card Circle 138 on Reader Service Card Circle 287 on Reader Service Card
