Page 45: of Maritime Reporter Magazine (October 2001)

Gratingless Air Circ System in Reefer Ships

Computer simulations and tests have been carried out by LauritzenCool and York Marine AB to confirm the suitability to distribute air in refrigerated cargo holds without gratings. The investigated grating-less concept was reportedly confirmed as successful by full-scale transports of bananas in a regular service over a period of half a year from Central America to Europe. The work has given valuable information in developing for- mulas and algorithms to design safe systems for grat- ing-less holds in refrigerated ships. The innovation means savings in the investment of the ship on grat- ings, lower molded depth of the hull for the same capacity and a higher stability to carry containers on deck. It will also lower maintenance costs. The project started in 1994 with laboratory work at ABB Ventila- tion Products to find criteria for the rate of cooling of bananas on single pallets. Soon, tests moved on to tri- als to determine the rate of cooling and temperature gradients in several pallets of bananas and citrus. Final- ly, regular shipments with bananas on pallets on the

M V Ivory Dawn were carried out during a period of six months in a service from Central America to Europe.

The tests and shipments have given valuable information to determine the criteria for the design and optimization of systems for grating- less holds for the next generation of refrigerated ships. Two different executions of the system were evaluated - supply of air under the pallets versus supply of air above the pallets by means of high velocity air jets tangent to a flush ceiling. Cri- teria for volume, speed and pressure of the air, geo- metrical limitations of the cargo holds and other requirements that all give an as good as in today's con- ventional refrigerated ships or even better cooling rates and keeping of the temperatures of all types of produce on pallets in refrigerated cargo holds have been deter- mined.

MasterSHIP CADCAM Seminar For Shipbuilders During EUROPORT, METS

On November 12 and 13, 2001, the fifth MasterSHIP CAD/CAM seminar for ship- builders and ship designers will take place in the Netherlands. The seminar is organized by Yachting Consult. MasterSHIP helps shipyards to reduce costs, by preparing the whole ship construction in the computer, ready for NC cutting. The seminar is planned in the same week as the EUROPORT and METS exhibitions in Amsterdam, so interna- tional visitors can combine these events. This year's seminar theme is how to combine

Engineering and Logistics into a profitable shipbuilding process. In one presentation will be demonstrated how the new MasterSHIP Organizer, a time saving database, helps engineers to track ship parts. Another lecture will explain the entire process of work preparation using the newest MasterSHIP 2002 release. Other presentations demon- strate the newest examples in 3D work preparation including hull and interior construction, installations and piping routing, using software tools as AutoCAD and Mechanical Desktop. Seminar participants will also be informed on the total service concept of theYachting Consult engineering department. On the second day two shipyards and a cutting center will be vis- ited to see the results of this CAD/CAM approach in on going newbuilding projects. These visits offer a unique opportunity to see Dutch shipbuilding in operation and to meet shipbuilders using MasterSHIP software.

Circle 179 on Reader Service Card www.maritimereporterinfo.com r Viking Life Saving Equipment

SEE US AT SNAME BOOTH #317 1625 N. Miami Ave.

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T: 305-374-5115 F: 305-374-1535 [email protected], www.viking-life.com

Viking Life Saving provides a variety of Inflat- able life rafts, life jackets, and other marine safety equipment.

Thordon Bearings

SEE US AT SNAME BOOTH #305 3225 Mainway Dr.

Burlington, ON L7M 1A6

T: 905-335-1440 F: 905-335-4033 [email protected], www.thordonbearings.com

A pioneer in the development of pollution-free bear- ing designs, Thordon Bearings offers a choice of either sealed or open, water lubricated propeller shaft bearing systems; and grease-free rudder bear- ing systems. Reliability, long wear life and superior customer service have made Thordon Bearings the first choice for repair, conversion or new build pro- jects.

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October, 2001

Circle 322 on Reader Service Card or visit www.maritimereporterinfo.com

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