Scrubber System Designs

Wärtsilä has developed two kinds of standard scrubber designs to better meet the demands of our customers. Wärtsilä can offer the conventional venturi scrubber design, as well as the more compact inline scrubber system.

Both scrubber designs have benefits and drawbacks dependent on vessel type and layout, so it’s important to look at the specific project needs. Both designs can be utilized for open loop, closed loop and hybrid scrubber systems.

A more detailed comparison of the two types of designs can be found in the presentation.

    SOReduction - Wärtsilä cares about your compliance

    The reduction of sulphur oxide (SOx) emissions from marine vessels has been a priority for quite some time now.  IMO regulations to reduce SOx emissions from ships first came into force in 2005, under Annex VI of the International Convention for the Prevention of Pollution from Ships – known as the MARPOL Convention.  Since then, SOx emissions have continued to be scrutinized. From January 1st 2020, the limit for sulphur in fuel oil used on board ships operating outside designated emission control areas will be reduced to 0.50% m/m (mass by mass). This will significantly reduce the amount of SOx emanating from ships, therefore bringing tangible health and environmental benefits for the world – particularly for populations living close to ports and major shipping routes.

    The main type of bunker oil for maritime vessels is heavy fuel oil, derived as a residue from crude oil distillation. Crude oil contains sulphur which, following combustion in the engine, ends up in ship emissions. SOx are known to be harmful to human health, causing respiratory symptoms and lung disease. In a study on the human health impacts of SOx emissions from ships, it is estimated that by not reducing the SOx limit for ships from 2020, the air pollution from ships would contribute to more than 570,000 additional premature deaths worldwide between 2020-2025.  In the atmosphere, SOx can lead to acid rain, which can harm crops, forests and aquatic species, and contributes to the acidification of the oceans. Therefore, through limiting SOemissions from ships one will not only improve air quality, but will also aid in protecting our environment.

    Wärtsilä has developed a full wet scrubber portfolio to fit each of our customer needs, and to meet their requirements in the reduction of SOx.  The range of Wärtsilä exhaust gas cleaning system (EGCS) have been tested and certified according to IMO guidelines, thus ensuring safe operation and compliance

    Wärtsilä continuously strives for technological excellence, and to minimize the environmental impact of our scrubber systems. 

    A Wärtsilä EGCS is a compliant solution for the entirety of your vessel’s lifetime

    The Wärtsilä EGCS body is constructed from over 50% recycled steel

    Our EGCS are engineered with the option to include wash water treatment units in order to ensure the safest possible discharge back to seawater.   

    In addition, Wärtsilä EGCS not only reduce SOx, but also remove large levels of particulate matter (PM) and black carbon

    Wärtsilä cares about the compliance of your fleet.  And we have made it easy for you to get exactly what you need – a compliant and environmentally friendly exhaust gas cleaning solution.  Contact our Sales Team today to find out more.


    Press releases

    Wärtsilä awarded repeat order to supply exhaust gas cleaning systems for 3 Finnlines vessels

    by Wärtsilä Corporation | Aug 28, 2015

    Finnlines, a leading Ro-Ro and passenger vessel operator with services in the North and Baltic Seas, has contracted Wärtsilä to supply three of its vessels with exhaust cleaning scrubber systems. Finnlines is part of the Grimaldi Group. This is a repeat order as in 2014 Finnlines placed a similar contract to have six of its ships fitted with Wärtsilä’s exhaust gas cleaning systems. This latest contract is booked in the third quarter. The equipment is scheduled for delivery in early 2016.

    “We are very pleased to call on Wärtsilä again to provide us with the latest emissions abatement technology and know-how. This is an important step towards having our entire Baltic fleet scrubber equipped and in fully operational service," says Tapani Voionmaa, Group General Counsel, Finnlines Plc. 

    “Repeat orders are always very satisfying as they represent confirmation that the performance of the systems delivered earlier fully meets the owners’ needs and expectations. Wärtsilä is the market leader in scrubber systems for marine applications. We have a very strong track record in enabling ship owners and operators to comply with all SOx emission regulations,” says Juha Kytölä, Vice President, Environmental Solutions, Wärtsilä.

    The system selected for the three vessels is Wärtsilä’s Hybrid in-line scrubber system. This system configuration provides the flexibility to operate in both open and closed loop modes. Furthermore, the compact in-line version provides an efficient space and weight saving solution.

    The International Maritime Organization’s (IMO) stringent sulphur oxide emissions regulations came into effect from the beginning of 2015. The Wärtsilä systems successfully clean the exhaust, thereby enabling the ships to continue operating on heavy fuel oil. The Wärtsilä scrubber systems also comply with the water discharge criteria set by regulators.

    Link to related press release published 14 May, 2014:
    Finnlines selects Wärtsilä systems to reduce Baltic Sea environmental impact

    Link to
    Wärtsilä exhaust gas cleaning offering for the marine industry

    Link to image
    Caption: A total of 9 Finnlines vessels have now been contracted to be fitted with Wärtsilä scrubber systems

    Media contacts:
    Ms Britt-Mari Kullas-Nyman
    Director, Retrofit, Environmental Solutions
    Wärtsilä Marine Solutions
    Tel: +358 10 7091625

    Ms Marit Holmlund-Sund
    Senior Manager Marketing, Communications, Marine Solutions
    Wärtsilä Corporation
    Tel: +358 10 709 1439

    Mr Tapani Voionmaa
    Group General Counsel
    Tel: +358 (0) 10 343 5207

    Wärtsilä in brief:
    Wärtsilä is a global leader in complete lifecycle power solutions for the marine and energy markets. By emphasising technological innovation and total efficiency, Wärtsilä maximizes the environmental and economic performance of the vessels and power plants of its customers.
    In 2014, Wärtsilä's net sales totalled EUR 4.8 billion with approximately 17,700 employees. The company has operations in more than 200 locations in nearly 70 countries around the world. Wärtsilä is listed on the NASDAQ OMX Helsinki, Finland.

    Finnlines in brief:
    Finnlines is one of the largest North-European liner shipping companies, providing sea transport services mainly in the Baltic and the North Sea. Finnlines’ passenger-freight vessels offer services from Finland to Germany, Sweden to Germany and from Finland via Åland Islands to Sweden. The company has subsidiaries in Germany, Belgium, Great Britain, Sweden, Denmark and Poland which all are also sales offices. In addition to sea transportation, the Company provides port services in Helsinki and Turku.


    Related products

    Exhaust Gas Cleaning Team

    Heidi Paulsrud

    Heidi Paulsrud
    Director – Sales & Marketing 

    Sergio Rodrigo Palencia

    Sergio Rodrigo Palencia
    Sr Sales Manager – Cruise & Special Projects

    Kashif Javaid

    Kashif Javaid
    Sr Sales Manager

    Johanna Snickars-Nykamb
    Ren Li

    Ren Li
    Sales Manager

    Christian Lobsgaard

    Christian Lobsgaard
    Sales Manager

    Aslak Suopanki

    Aslak Suopanki
    Manager – Sales Support


    Life-Cycle Services Team

    Sven Svanberg

    Sven Svanberg
    Director –  Lifecycle Services

    Scott Oh

    Scott Oh
    Director –  Asia Operations

    Joanna Marczyk

    Joanna Marczyk
    Sales Manager –  Lifecycle Services

    Nyfors Mats

    Mats Nyfors
    Sales Manager –  Lifecycle Services

    Myong Koo Kang

    Myong Koo Kang
    Sales Manager –  Lifecycle Services

    Jasman Hassan

    Jasman Bin Hassan
    Sales Manager –  Lifecycle Services

    Deniz Eke

    Deniz Eke
    Sales Support Engineer –  Lifecycle Services


    Contact us

    Please fill in the form, we aim to respond within 1-2 business days depending on the enquiry. For an existing installation, provide all necessary details to identify the installation and the equipment. Fields indicated with an asterisk (*) are required. 

    Find your local Wärtsilä office here

    Contact our 24/7 customer support at +47 239 68 292 for assistance with exhaust treatment solutions.

    To enable prompt response, please indicate the Equipment Serial Number or the name of the vessel. Equipment Serial Number is taken from the equipment nameplate and includes all letters and numbers as given on the equipment nameplate.

    © 2021 Wärtsilä