Page 61: of Maritime Reporter Magazine (May 2015)

The Marine Propulsion Edition

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Diesel Generators and Marine nés. For this type of vessel, the ability to cost savings achieved from having the the high power density, PM machines

Propulsion switch to the Take Me Home mode pro- auxiliary generators turned off when in can pack more power in a package that is

PM machines offer special seafaring vides Auxiliary Propulsion Drive (APD) sailing mode. far more compact, lighter in weight and vessels the opportunity to lower opera- in the same package is key. The solution PM machines are also known for their smaller in size compared with induction tional costs by optimizing the fuel con- provides considerable fuel and service unmatched design ? exibility. Thanks to machines. sumption of the diesel engine. Ships often use diesel generators, not only to provide auxiliary power for normal

Air Products nitrogen generators

Visit Us at consumption, but also indirectly for the

When reliability matters

Nor-Shipping main propulsion. There are two different

Booth B05-30 main types of diesel engines: 2-stroke

See us at and 4-stroke. The main difference from the generator point of view is the rota- tional speed. The 2-stroke engine has a

Stand C01-e, Hall C

Norwegian Pavilion rated speed from 50 to 200 rpm, while a 4-stroke engine is typically above 500 rpm.

Two-stroke engines in marine are mainly used for propulsion. But as the power generation may be integrated into the main propulsion system, it has to ap- ply the same speed as the main engine or the revolutions have to be raised with a step-up gearbox.

The Switch manufactures both direct-

Air Products has been Pioneers in the Nitrogen driven shaft generators in frame sizes of 1000 and 1500 and high-speed gen- market since 1982 and more than 1.000 marine N2 erators in frame sizes from 450–710. generators have been installed onboard ships.

So-called shaft generators are direct drives built around the main propulsion

If you wish to learn from our 30 years experience, shaft, which are part of the main propul- contact us and we will share with you.

sion line. High-speed machines (~1500 rpm) are connected to the propulsion line through the gearbox. In addition to power generation, machines may also be used for electric propulsion. In such cas- es, separate auxiliary generators produce the propulsion power. These auxiliary

Air Products - Chem2 - 128x90 - NorShipping.indd 1 2013-04-26 10:57:55 generators are typically 4-stroke diesel engines.

At the end of February, WE Tech Solu- tions placed orders for two PMM 1000

M shaft generators from The Switch with the option for an additional two to be used in future WE Tech Solutions

STOCK (Purchase and Rental): projects. WE Tech Solutions utilizes the s

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First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.