Expanding Wärtsilä’s Auxpac engine portfolio master

Expanding Wärtsilä’s Auxpac engine portfolio

The market for auxiliary marine engines has been in decline, but there are already signs of a recovery. Market analysts are predicting that this recovery will continue and accelerate during the coming years. In anticipation of this upsurge in demand, Wärtsilä has expanded its Auxpac portfolio with the introduction of two new engines.

Text: LARS ANDERSON Photo: -

Wärtsilä has recently strengthened its auxiliary engine offering with the introduction of the Wärtsilä Auxpac 16 and Wärtsilä Auxpac 32 to complement its existing Wärtsilä Auxpac 20 and Wärtsilä Auxpac 26 engines. The revised portfolio will enable us to serve an even broader market than earlier, since the complete spectrum of auxiliary power requirements can be met. The Wärtsilä Auxpac 16 serves the lower end of the market, from approximately 500 kWe to 750 kWe per generating set; the Wärtsilä Auxpac 20 goes up to approximately 1700 kWe, the Wärtsilä Auxpac 26 serves power needs up to 2800 kWe, and finally, for the uppermost power range required typically by large container vessels, the Wärtsilä Auxpac 32 offers between 2400 kWe and 4500 kWe.

Although the market for auxiliary engines has been in decline with considerable over capacity of manufacturing, there are now clear signs of a recovery. According to market analysts, this recovery will continue to gain momentum during the coming years. While the bulker and tanker markets may take longer to pick up, there is significant activity regarding large container vessels, and this is clearly boosting demand. Wärtsilä’s decision, therefore, to develop an expanded family of auxiliary engines that fully meets this demand makes obvious sense.

Proven performance

The new expanded Wärtsilä Auxpac family offers notable benefits to both shipyards and owners. With more than 1150 Wärtsilä Auxpac generating sets in operation, which together have accumulated more than 6 million running hours with excellent reliability, the technology is certainly well proven. The engines comply with the International Maritime Organization’s (IMO) Tier II environmental regulations, while Tier III compliance can be achieved with the addition of an exhaust after-treatment system.

The engines come as pre-engineered generating sets with easy connections. This is in line with Wärtsilä’s ‘plug and play’ concept, to shorten, ease, and optimise the installation work. Additionally, the compact design of the Wärtsilä Auxpac engines leaves more space in the engine room. When compared to auxiliary engines produced by competitors, they are up to one metre shorter in length and remarkably lighter in weight. In fact, the power-to-space ratio of the Wärtsilä Auxpac engines is one of the best on the market.

Another beneficial feature is the resilient, flexible, engine mounting that comes as standard. This facilitates the easy installation and alignment of the generating set. It also cuts down considerably on the noise transmitted from the generating sets to the hull, thereby providing a quieter and more comfortable environment for the crew.

Standardization and simplification

Not least among the many benefits of the Wärtsilä Auxpac range is the work that has been done to reduce the number of maintenance tools required. This is thanks to component design commonality and it results in less downtime and lower maintenance costs.

Standardization and simplification have been key words in the development of the Wärtsilä Auxpac 16 and 32. In a market that has become increasingly commoditized in the sense that the cost of the engine often appears to be the only deciding factor in the purchase decision, it was fortunate for Wärtsilä that its well established and proven technologies, that have been so successful with the Wärtsilä Auxpac 20 and 26, could be used. It was not, therefore, necessary to invest heavily in developing new technologies. Common components were also utilised wherever possible.

Expanding Wärtsilä’s Auxpac engine portfolio 1
Fig. 2 – The Wärtsilä Auxpac 32 engine.
Expanding Wärtsilä’s Auxpac engine portfolio 2
Fig. 3 – Rated power, dimensions and weights of the Wärtsilä Auxpac 16 engine.

The Wärtsilä Auxpac 16

The Wärtsilä Auxpac 16 is a brand new engine and the smallest of the Wärtsilä auxiliary range having a power output from 455 to 735 kWe. It has been developed in co-operation with SMDERI, the Shanghai Marine Diesel Engine Research Institute, and will be built in China at Wärtsilä’s joint venture company, Wärtsilä Qiyao Diesel Company. It is available in configurations of 5, 6 or 7 cylinders, and comes equipped with a built-in, multi-functional, digital automation system that has an integrated electronic governor to ensure smooth control and fast response to load transients.

The engine is able to operate on different fuels, ranging from the marine diesel oil (MDO) viscosity of 2,0 cSt to a heavy fuel oil (HFO) viscosity of 700 cSt (at 50°C). The engine is also able to use low and ultra low sulphur fuels (<0.01%S) as per the standards set by authorities for fuel use in emissions controlled areas. It has been designed to serve a variety of merchant vessel types, but is especially suited for providing power to small tankers, bulkers and container vessels.

The introduction of the Wärtsilä Auxpac 16 means that Wärtsilä can now offer shipbuilders and owners alike the same advantages featured in its proven medium-speed engine technology in output ranges that are suitable for smaller vessels. Since 100% of the bulkers and 84% of the tankers ordered in 2012 are being built in Asia, the strategic decision to manufacture this engine in China, close to the shipyard customer base, was not hard to make.

The Wärtsilä Auxpac 32

The Wärtsilä Auxpac 32 is the auxiliary engine version of the Wärtsilä 32 engine family, which has been part of the portfolio since 1998. During that time, more than 1200 Wärtsilä 32 engines have been sold globally, so the technology is well established and proven. This engine is aimed at the upper end of the merchant market, notably large container vessels with an auxiliary power need from approximately 2400 kWe to 4330 kWe per generating set.

This engine offers the lowest fuel consumption in its class at 177 g/kWh, and this of course has a direct relationship to exhaust emissions. Obviously, the less fuel consumed, the lower the emissions. The Wärtsilä Auxpac 32 comes in configurations of 6, 7, 8 or 9 cylinders and, like the Wärtsilä Auxpac 16, is able to operate on different fuels. Its compact design can save many cubic metres of installed space and it is considerably lighter in weight than other engines in its class.

With 98% of the new container ship orders for 2012 going to Asian shipyards, it is again not surprising that this engine will also be produced in China at the Wärtsilä Yuchai Engine Company joint-venture facilities.

Fig. 4 – The Wärtsilä Auxpac 16 engine has been designed for a variety of vessel types, but is especially suited for small tankers, bulkers and container vessels.
Expanding W&#228;rtsil&#228;’s Auxpac engine portfolio 4
Fig. 5 – Rated power, dimensions and weights of the Wärtsilä Auxpac 32 engine.


In expanding its auxiliary engine portfolio to cover a far broader range of vessel types, Wärtsilä is making a strong effort to increase its share of this market. The addition of the Wärtsilä Auxpac 16 and 32 engines has introduced a combination of technical excellence with cost competitiveness. This ‘best of both worlds’ approach has been successfully achieved by basing the design on proven technology, and by using high levels of standardization and component commonality.

Trade press release: Wärtsilä expands its portfolio with two new auxiliary engines 

Wärtsilä Merchant solutions

Expanding W&#228;rtsil&#228;’s Auxpac engine portfolio 5
Fig. 6 – The Wärtsilä Auxpac 32 is aimed primarily at the upper end of the merchant market, in particular large tankers, bulkers and very large container vessels.

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