Page 31: of Maritime Reporter Magazine (March 15, 1985)
Renk of Augsburg, West Germa- ny, has available new literature on the Renk Constant Frequency (RCF) gear unit. The publication states that all shipowners ask for more cost-effective onboard power generation than was formerly possi- ble, and one answer is the RCF sys- tem, which features a differential epicilic gear and a Renk controller.
The epicilic gear unit with hydro- static or electric superposition en- ables the generation of economic current by the large diesel engine of the main propulsion plant.
The RCF system is said to be a design solution that offers definite economical advantages, especially in plants incorporating low-speed diesel engines and fixed-pitch pro- pellers. However, the RCF system is also used with controlled-pitch pro- pellers and with medium-speed die- sel propulsion systems.
Installation variants of the RCF system are described, with dia- grams, such as parallel, vertical, rec- tangular, Z-arrangement a shaft- mounted generator, U-arrangement as shaft-mounted generator, and special solutions.
Circle 90 on Reader Service Card
Maxim® products manufactured by Riley-Beaird of Shreveport, La., can add to the efficiency of diesel engines by putting normally wasted heat to use. Heat recovery silencers by Maxim reclaim waste heat from the engine's exhaust gases, to gener- ate steam and heat water or other fluids. Maxim silencers, with inte- gral spark arresting, noise control, and energy efficiency, use proven
U.S. technology, expertise, and ma- terials.
Heat recovery evaporators by
Maxim make use of the engine cool- ing water and/or recovered exhaust heat to provide fresh water from seawater. These evaporators are built to U.S. Coast Guard and
American Bureau of Shipping re- quirements, and are available in a range of sizes to suit engines for main and auxiliary systems, and to satisfy varying shipboard demands for steam and water. They can be supplied as separate, independent, or packaged, integrated systems, for both shipboard and offshore appli- cations.
Other Maxim specialty marine products include heat exchangers, seawater strainers, steam-fired boil- ers, and deaerators.
Circle 91 on Reader Service Card
GmbH & Company KG, has been well known for 35 years for its ruu- derpropellers, transverse power units, and for the past five years its
The rudderpropellers were the company's first product, and are supplied as transom and retractable units of up to 6,035 bhp. The next development was the single steer- able and non-steerable rudderpro- pellers that were installed mostly in offshore type vessels.
Another development was the
Schottel Navigator unit that in- cudes, mostly on a single frame, the engine with or without the rudder- propeller. It can also be supplied with an integrated steering stand.
Next came the steerable and non- steerable transverse tunnel thrust- ers and maneuvering units.
The latest development, the
Schottel-jet unit, is supplied with a horizontal swinging propeller that, with the cone-jet type unit, is run- ning under an angle of 25 degrees.
The propeller is thereby accommo- dated within the bottom line of the vessel.
The new Schottel pump-jet does away with the propeller completely, using a rotary wheel instead. These are also 360-degree steerable. Up to 250 hp the units are often controlled by hand; above that power they are steered either hydraulically or elec- trically.
Circle 92 on Reader Service Card
The Coupling Division of SKF
Steel, with U.S. headquarters in
Avon, Conn., has developed the
OKF coupling to fill the need for a simplified method of connecting a shaft to a flanged prime mover or gearbox output. This coupling con- nects a cylindrical shaft without taper or keyway to the output flange, reducing machining time and costs, and saving installation problems with tapered fits and fit- ted keyways.
The coupling is similar to the OK shaft coupling that uses no bolts, nuts, keys, or keyways. It employs a powerful interference fit to transmit high torque and shock loads—an interference fit that is created with- out using heat to expand the compo- nents.
Some of the needs and/or condi- tions under which the OK coupling is advantageous are: when high torque transmission is essential; high impact loads or reversing torque exist; reduced number of support bearings is desired; and couplings must be balanced exact- ly.
The OK coupling can be as easily removed as mounted; maintenance time for changing seals in bearings, for example, is considerably re- duced.
Circle 93 on Reader Service Card
The Sulzer Efficiency-Booster is an extremely cost-effective option for Sulzer RTA low-speed diesel en- gines. Applied as a compact, fully integrated part of the engine, it has demonstrated its ability to contrib- ute further significant fuel savings to what are already highly efficient prime movers. It offers much more than straightforward savings in spe- cific fuel consumption, and opens a whole new area for discussion about engine economy. Its overall benefits include:
Reduced fuel costs throughout the engine load range, with fuel sav- ings of up to 4 grams per brake horsepower hour at engine contract maximum continuous rating— equivalent to about 3 percent less fuel consumption.
Reduced engine first cost. The added flexibility in engine selection offered by the Efficiency-Booster can allow the use of an RTA engine with fewer cylinders for the same ship requirements, hence a shorter engine room. Greater freedom in ship operation due to the fuel sav- ings at engine part-load. It is thus particularly beneficial for "two- speed" ships—those vessels operat- ing for long periods at reduced speed.
Circle 15 on Reader Service Card
Tech Development Inc. of Day- ton, Ohio, manufactures the TDl
Turbostart™ air starter for diesel and gas engines. The company re- cently issued a new edition of its "Air Starter Selection Guide," a 70- page publication that is a cross ref- erence of engine manufacturers and the appropriate Turbostart model.
Included in the guide are specifi- cations for each starter model, and separate listings of diesel and gas engine models by manufacturer. All
Turbostart market applications are covered in the new publication.
Circle 94 on Reader Service Card
Thompson-Gordon Limited of
Burlington, Ontario, Canada, was founded in 1911, and began manu- facturing Thordon® marine bearings in 1970.
The Thordon XL alloy represents a unique compromise between the outstanding wear-resisting capabili- ties of rubber bearings and the high load-support capability of lignum vitae and phenolic. Incorporated into the formulation are low-friction additives that reduce friction in boundary and start-up conditions.
The relatively high compression modulus of Thordon permits L/D
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Circle 350 on Reader Service Card
March 15, 1985 33