‘SteamEye’ wireless steam trap monitoring

Armstrong International, a leader in intelligent system solutions for steam, air and hot water utility applications, has launched SteamEye, a wireless steam trap monitoring system designed to achieve energy savings and reduce labour maintenance time in steam-intensive applications.

“SteamEye is a valuable diagnostic tool that allows users to continuously monitor the performance of any steam trap and learn the moment a trap blows through, so that huge energy losses can be prevented,” said Chris Gibbs, account manager for Armstrong International: “At today’s record energy prices, the cost of steam is now over USD10 per 1,000 pounds and just one blown trap can cost an operation more than USD6,000 a year,” Gibbs said.

SteamEye is an ideal solution for steam intensive users such as refining and petroleum manufacturers, food processors, chemical manufacturers, and institutions such as hospitals and universities that want to reduce labour costs associated with manual monitoring of their steam trap population and to contain high-energy costs caused by blown or failed steam traps.

SteamEye works by using a wireless-mesh transmitter mounted at the inlet of any manufacturer’s type or style of steam trap. It detects fluctuations in steam flow and temperature and instantly sends a signal to a web-based receiver, alerting system operators of trap failure or blow-through. SteamEye will be especially valuable in applications where steam traps are located in hard-to-reach or dangerous areas such as underground tunnels. SteamEye is also an ideal replacement for hand-held diagnostic tools, which are labour intensive and often inconsistent in their assessment.

SteamEye works in tandem with SteamStar, the first web-based steam trap measurement platform that collects data from manual steam trap surveys, hand-held diagnostic tools or steam traps equipped with SteamEye. SteamEye and SteamStar together offer the first integrated solution for continuous, labour-free steam trap monitoring.

In addition, SteamEye can communicate with building automation systems or other control systems.

The origins of Marconi and wireless

Emerson chose Bologna to launch their Smart Wireless system in Europe, in homage to Marconi: reviewing the reports from attendees, Processingtalk suggests some other links with Marconi and wireless

Eoin O Riain of the Read-out website in Ireland opened his report on last week’s Emerson launch of their “Smart Wireless” products into Europe with the following paragraph.

”The Emerson launch of their Wireless Offering in Europe was held in the historic city of Bologna, a most significant place to launch such a product and concept as it is the birthplace of Marconi, discoverer of wireless communications: Indeed the editors and representatives of 60 or so European publications, including Read-out, were treated to the unique experience of a tour of the Villa Griffone, his childhood home, and where in his teenage years he started his experimenting”.

See the full text of his report on his own page http://read-out.net/me/070111epm.html.

Similarly Andrew Bond reported on the event in his Industrial Automation Insider newsletter, January issue, http://www.iainsider.co.uk, as follows.

”Emerson brought its in-plant wireless technology to Europe, by summoning the European press to Bologna, the birthplace of Guglielmo Marconi.

Perhaps aware that they may have put some European [Editor’s] noses out of joint by launching Smart Wireless in North America – and actively trying to prevent the European press from reporting it – they wheeled out an arsenal of North American and European big guns from the Emerson management.

There was not a whole lot more in the main Bologna presentations that had not been seen in Nashville conference at the Emerson Exchange in Orlando 12 months earlier”.

This had been the subject of several previous reports from Andrew in his Insider newsletter.

So did Emerson get it right by taking 60 Editors to Bologna, to pay homage to the place where Marconi started his wireless communications career? Certainly Marconi grew up in Bologna, where his interest in the subject of wireless took off in 1894, after the death of Hertz, and he worked at home.

But he was quoted as finding little interest in his work in Italy: remember he was only 20 years old at the time, and in modern parlance might have been called a technology nerd.

He moved to London with his mother in 1895.

Eoin at Read-out reminds us (all the time) that Marconi’s mother was born Anne Jameson, of the Irish (Whiskey) Distillery family, so no doubt she had considerable influence in London Society in these Victorian times.

Somehow, Marconi gained the interest and support of William Preece, the Chief Electrical Engineer of the British Post Office, and demonstrated wireless transmissions on Salisbury Plain and across the Severn Estuary.

He presented lectures in London, such as “Telegraphy without Wires” at the Toynbee Hall in December 1896, and “Signalling through Space without Wires”, given to the Royal Institute in June 1897.

As a result of this work in England, his first Patent, a UK Patent, was filed June 1896, and granted in July 1897, (which is 110 years ago).

1897 was a very busy time for Marconi.

Not without sound financial backing, presumably from his family, he founded the Wireless Telegraph and Signal Company in London, and soon changed the company name to Marconi’s Wireless Telegraph Company.

He had turned down an immediate British Post Office offer to buy his company.

He did demonstrate his wireless technology in La Spezia back in Italy, but in November, 1897, Marconi’s first permanent transmitting station was erected at The Needles, near Alum Bay on the Isle of Wight in the south of England.

The next year saw the opening of the world’s first “wireless telegraph” factory, the Marconi factory in Chelmsford, England, employing around 50 people.

One of the first marketing objectives and targets for his venture was to transmit wireless messages to transatlantic ships, which is why the Isle of Wight was chosen for the first transmitter.

Sending messages across the Channel and to ships passing up and down the Channel were routine.

For the record, Marconi also demonstrated his wireless transmissions in Ireland, with a test for Lloyds taking place in May 1898, transmitting between Ballycastle and Rathlin Island.

One of the major technology developments and high-tech discussion topics in Victorian times was the world wide web network – of submarine telegraph cables that is.

They were the boom business of the era, transmitting messages, using morse signals, all around the world.

One of the major processors and terminals for this web was in Cornwall, where the cables came ashore from under the various Oceans at Porthcurno, on the West side of Mount’s Bay.

The first cable had been laid from Porthcurno in 1872, linking to India, a colony at the time.

This ‘Victorian Internet’ is explained in a book of that name by Tom Standage, see http://www.tomstandage.com, and he explains the problems with hackers, chat-rooms and information overload, which have parallels in current times.

Marconi had his sights set on jumping on this web-based growth market, and competing with the Eastern Telegraph Company at Porthcurno by winning their transatlantic traffic for his wireless system.

Marconi bought a site on the opposite side of Mount’s Bay, at Poldhu, in 1900, and established a radio station there.

In January 1901 the station at Poldhu was set up and received their first radio message from the Isle of Wight, operating at 1.7MHz.

The first transatlantic morse message by radio was claimed to be transmitted in December 1901 from Poldhu, to St John’s in Newfoundland, 2100miles away, where Marconi claimed to have heard the signal using a kite-supported 400foot receiver antenna.

It was a repeated “S”, 3 dots in morse code, in the daytime, not independently verified, and very similar to the static noise.

There was some scepticism over his claim! To provide verification, Marconi sailed from the UK to the USA on the SS Philadelphia in 1902, recording signals sent from the Poldhu station.

Signals were received at up to 2099miles, but only at night, when the reception was much better: in the daytime 700miles was the maximum range achieved.

A signal was sent across the Atlantic in the reverse direction much later, in December 1902 from Nova Scotia in Canada.

Later, a message from Roosevelt to King Edward VII was reputed to be the first message transmitted from the USA to Europe, sent to Poldhu in January 1903, but although a regular transatlantic telegraph service did start in 1907, it was very intermittent.

This delay of over a year in wireless messages coming back to Europe out of America is interesting: there’s a parallel there with another part of this story! Meanwhile, Europe had been getting on with applying the wireless technology.

The Marconi Station at Poldhu is no longer there: the original Hotel built for the workers is now a retirement home.

Further inland in that same Lizard Peninsula, are the Goonhilly Downs, which is where the Goonhilly satellite telephone communications UK base station is situated.

Goonhilly still handles a lot of traffic across the Atlantic – around 10 million telephone calls a week, computer data, fax, video conferencing, and telex from the Atlantic and Indian Ocean areas.

Goonhilly is now also the terminal for the fibre optic transatlantic cables that have replaced the original wire based telegraph cables of the 1800s.

In modern internet parlance Goonhilly is probably an important node on the mixed wired and wireless and optical fibre-based communications network created to run the Internet.

What happened to the original Eastern Telegraph Company at Porthcurno? It expanded with the communications technology (dot.dash) boom, but in 1928 it merged with their main competitor, i.e Marconi’s Wireless Telegraph Company to form Imperial and International Communications: this was renamed Cable and Wireless in 1934.

The six fibre optic cables for Goonhilly enter the sea at Porthcurno, and are still in operation, but you cannot see them.

All you can really see at Porthcurno is the remains of a wireless aerial set up in 1901 to listen in to the Marconi transmissions, and spy on what he was up to, from his Poldhu site, visible across the bay! So was Bologna the right place to visit? The Emerson wireless launch possibly overlooked the world wide communications that started before Marconi even thought of wireless.

Most of the reports to date on their wireless ideas has been available over the modern internet, through Goonhilly, as a result of US published data.

So did Emerson get the launch right? Maybe, for Editors that like Italian country pasta and ten course meals, according to the report from Andrew Bond.

My vote would have been for a trip to Goonhilly, as a radio network node, and where wireless can be said to interface with both dot.com and dot.dash! But then I have a bias towards trips to Cornwall!.

Practical Aspects of Profibus PA in Process

The UK Profibus organization sponsored a process industry specific training day at the end of November 06, with the title of the “Practical Aspects of Profibus PA”: Nick Denbow reports.

This seminar was hosted by Mark McCormick of Siemens in their impressive offices in Bracknell, to provide a Southern UK venue following the 2005 event in Manchester.

It focused on presenting the key practical issues arising from the use of digital fieldbus communications technologies in process applications, from system design and hazardous area considerations through to maintenance and fault-finding.

Mark Cargill, originally listed as from Purac, explained that Purac was now called EnPure, following an MBO of the business from AWG, the original Anglian Water.

Mark described the practical steps he has found needed, in order to plan and then succeed with a Profibus project: useful input since no-one in that day’s forty strong audience claimed to have previously achieved a success with a Profibus installation (But no-one had failed either).

The audience profile was from many industries, but the major representation was from the water industry, which was identified as having major Profibus potential by most of the speakers.

Perhaps surprisingly, Mark stressed the need for more advanced planning with a Profibus project (compared to a conventionally wired one): it was necessary to choose the equipment supplier for PLC and field devices carefully and early, preferably as a single supplier approach, and also important to insist on receiving the GSD files in advance: plus all devices should be requested pre-addressed.

This meant that a Profibus project has to start ‘far earlier’ than a conventional project, (measured to the start of site installation presumably) because the good groundwork will compress these later phases, including most importantly the provision of the as-built drawing package to cover the complete installation and wiring records.

However, for the installation phase, it is essential the field installer chosen has previous Profibus project experience, or has completed the certified training courses offered through the Profibus Group, because cabling errors (such as mixing up the use of Profibus DP and PA cables) are the major problem area resulting from an installer with poor awareness.

Tony Grassby from Endress + Hauser continued the discussion of the need for careful component and cable selection, but commented that in terms of equipment, most projects he has seen had been multi-vendor installations.

Tony covered the selection of hazardous and non-hazardous area DP/PA segment couplers and links, and lightning protection devices.

In addition, while all devices should be wired into a junction box on an individual spur, using glands or plugs and sockets, most system faults in his experience were in the field in the junction boxes.

An example of one company who investigated the capabilities of fieldbus cabling thoroughly was quoted as Imerys, (originally English China Clays) who in their area of Cornwall suffer from a lot of electrical storms.

Only after a year of successful on site testing of a trial network installation were they prepared to consider major Profibus PA installation projects, and now Imerys typically specify and request Profibus equipment.

A combined demonstration from all the lecturers with the equipment on display showed the software tools available for correcting and adjusting field instrumentation, firstly via the Siemens PCS7 PLC using the Siemens PDM Process Device Manager, then using the E+H FieldCare system, then using the 800XA system from ABB.

All the systems demonstrated the ease with which faulty devices can identified and replaced in the field, automatically being re-configured to fit the system requirements originally established.

It also showed how easily the process values can be reconfigured, and further operational data extracted.

All the different proprietary programmes can derive the data from the field devices, usually over Profibus, but also other data communication formats, like HART and FF and Ethernet and RS232 and Modbus, so the final programme and monitoring method used depends on the choice made for the site, rather than the equipment or the communications format it uses.

To have all these systems, plus also an Allen Bradley PLC all demonstrated alongside each other, within the Siemens HQ, caused some lifted eyebrows, even amongst the lecturers, but demonstrates the standardisation and interoperability of their Profibus communications systems! Andy Verwer of MMU also created and then showed how to analyse faults on the Profibus system, using protocol analysers and waveform visualisation using a softscope, to give a flavour of the possibilities when working with these systems once installed.

While I, perhaps a less technical one of the audience, found this difficult to follow, it certainly demonstrated an earlier comment that: “For Profibus systems you need a different fault finding approach: typically a fault, evident at one end of a bus will have its source at the opposite end”.

Gareth Johnston of ABB had the unenviable task of summarising what had been demonstrated, and looking ahead to seek suggestions for future events.

With a lot of different aspects crammed into a few hours of seminar time, the day did not give enough information to allow anyone to feel competent enough to engineer a project as a result! But the main message was evident, that there is a need to train and learn about these systems, and that such training is readily available through the Profibus Group, with upcoming events listed on their website, via http://www.profi-bus.co.uk.

Suppliers, Contractors, Installers and in user companies the Project Engineers are using Profibus systems to good effect, and are available to assist and advise on the necessary planning beforehand.

The next similar UK based Seminar and Process related event organized by the Profibus Group will be on March 9th, hosted by ABB at their Daresbury offices.

This will be followed by the regular annual two day International user conference and workshops in Warwickshire, from 26-27 June, see http://www.profibus.co.uk.

Registration forms for both events can be downloaded from http://www.uk.profibus.com, or are available on request to admin@uk.profibus.com .

Ballast water purification to protect Ecosystems

The Alfa-Laval launch of a ship’s ballast water purification system, PureBallast, took place at Greenwich – where else would it be? This is an impressive product, with an interesting future

The recent Alfa-Laval presentation and world-wide launch of a ship’s ballast water purification system, Pure Ballast, took the opportunity to really “Push the boat out” – and included all the aspects any Marketing Manager could ask for, to make a good product launch: Major life threatening problem, Large Demand, Legislative Requirement, High Technology, Patented system, Proven field trials, No significant competitors – plus a good venue, a BBC / IMO CD describing the requirement, and a receptive audience.

Not often do all these come together, after over three years of development work! The product is a water purification system to treat and purify the large volumes of water sucked in to ships for ballast, then transported around the world to be deposited in a different ecosystem.


Ballast water transported from port to port, around 7000 Million tonnes a year, by container ships, oil tankers and car transporters, transfers alien aquatic species over journeys across half the world.

Some of these species can produce devastation where they arrive.


1) Cone jellyfish from the US seaboard have colonised the Caspian Sea, where they have no predators.

They have caused the depletion of the native plankton stocks, which has decimated the local population of Kilki fish (sprats), destroying the local fishing industry therefore, but now affecting the Iranian Caviar industry because the sturgeon have no small Kilki to eat.

(A more effective economic strangulation than any politically motivated ‘nuclear activity’ sanctions!).

2) Chinese ‘Golden Mussels’ arrived in South America 5 years ago, and are invading the freshwater inland, penetrating towards the Amazon basin at 240Km a year.

The mussels coat the river beds, stopping other water life, and have killed the fishing industry again: plus blocked water extraction pumps, and are currently threatening to shut down the hydro-electric plants, having penetrated and populated the cooling systems.

3) The ‘Red Tide’ of algal bloom originating in the sea off South Africa produces a toxic, oxygen depleting layer, killing fish, but shellfish just secrete the poisons: this is now exported to China, Europe, Australia and the Caribbean, where the shellfish are poisoning local consumers.

4) This time not an organism, but a cholera outbreak in South America during the 1990s was believed to have been caused by the virus being transported in ballast water, when over 10,000 people died.

(Many of the above facts presented at the Alfa Laval launch are also reported in the film produced by BBC Worldwide and IMO entitled “Invaders from the Sea”, a joint initiative of the Global Environment Facility, United Nations Development Programme, and IMO: this is available on an IMO copyright CD.


1) The requirement is for a treatment system that can handle the volumes involved, kill the transported organisms and viruses, but leave no polluting residues, for example of toxic chemicals or disinfectants, which would equally damage the receiving port ecosystem.

2) IMO has decreed and agreed certain rules that require ballast water exchange at sea (where it is assumed the alien species will die off in the ocean), or treatment of the ballast water to stringent purification standards.

3) The ship owners and captains do not like the safety and complications of ballast water exchange at sea: it can make ships unstable, and susceptible to bad weather: already one car transporter has had a major incident resulting in the loss of the cargo.

4) Already US Coastguards inspect and sample ballast water to make sure the ships arriving have done suitable ballast water exchanges, before the ships are allowed into a US port.

5) The Alfa-Laval PureBallast system has undergone several years of practical tests, as required, and is the only system to have reached this stage.

THE PureBallast OPTION.

Alfa-Laval joined with Wallenius Water and DNV to present the PureBallast system to ship owners and journalists at the Greenwich Observatory early in December 2006, Greenwich being chosen as a major nautical scenario for such a significant development.

Wallenius Water developed the original AOT systems, (AOT is defined as Advanced Oxidation Technology), to enable systems that eliminate biofilms and hazardous bacteria from industrial water, swimming pools, cooling systems etc.

The technology is the same as that used to create the self-cleaning windows now used on skyscrapers and cars, using the reaction of UV light on titanium dioxide films.

The Alfa-Laval PureBallast AOT uses light, including ultra-violet light, to produce free OH radicals, i.e hydroxyl ions, within the water flow, in a reaction on the surface of a titanium catalyst.

These radicals are active oxidising agents over a very short spatial range, oxidising any organic material in the flow, but decaying within microseconds to leave no residual contamination of the flow stream.

(The system is NOT the same as water sterilisation by UV).

By removing the problems of bacteria without leaving any harmful residues in the ballast flow, the system is easy to employ.

The hydroxyl ions destroy the cell membrane of any Planktonic species by removing hydrogen from the structure, as would any other oxidising agent, like a chlorine based bleach, or ozone.

The main fluid interfacing problem seems to have been to create sufficient contact and turbulence within the flow stream to ensure all sections of the fluid were treated equally.

DNV were present at the launch to be able to confirm the laboratory test procedures established, which have been a major undertaking.

The basic unit shown was able to treat 250m3/hour, and uses significant power to light the lamps, around 6kW.

On-board and laboratory tests of the prototype units have met the IMO requirements for the removal of living organisms, producing lower than 10 particles per cubic metre, and reducing E.Coli to less than 250cfu per 100mL.

The on-board tests on a Wallenius car transporter will still take 6 months before final type approval can be granted.

More information can be found from Alfa Laval, on http://www.alfalaval.com/pureballast.


While Alfa-Laval will have a major market demand for this technology, in satisfying the ballast water market, this is just one of the Alfa-Laval water purification products available for the marine industry.

Alfa Laval is a supplier of desalination systems for fresh water onboard ship, and sewage treatment systems for shipboard use.

Bilge water separation systems under the EcoStream brand, uses high-speed centrifugation to separate oil, water and particles prior to bilge discharges, reducing oil content of the discharge flow to less than 5ppm, to meet a different and earlier IMO requirement.

Careful design of the smooth entry to the centrifuge prevents shearing and foaming which might create a further emulsion, reducing the separation efficiency.

EcoStream is used on all types of vessels, from Queen Mary 2 to LNG tankers owned by Gaz de France.


Wallenius Water (www.walleniuswater.com) currently offers an AOT based system for swimming pool and other industrial treatment systems: possibly with further production volumes and the Alfa-Laval interest in wider use of this water treatment technology, we will see further industrial use of the AOT free radicals for water purification, and effective sterilisation of further effluent outflows, for polishing of other discharges before allowing them into the environment.

Ballast water and effluent polishing

Perhaps the next most critical problem man has caused to the World, after global warming, is the devastation caused to many Ecosystems by the inadvertent transport of organisms and bacteria in ships ballast. Really it’s a simple water treatment problem, except that it involves 7000 Million tonnes of water a year, discharged at high flow rates, and it affects the business of some very aggressive and commercial freight transporting operations, in every country of the world.

The story has been told on an excellent BBC/IMO CD, which leaves you wondering why we are allowed to misuse this planet so: see a review of the problem in my report on the recent Alfa Laval PureBallast product launch, or also as detailed in the two recent Alfa Laval press releases. Several organisations come out of this with a lot of credit for their actions: like the London-based IMO, who have imposed world-wide ballast transport regulations, stimulating research into the problem. Like Australia, who took action to eliminate the South American black-striped mussel when it was discovered to have been imported to Darwin harbour: the quarantine and clean-up effort cost Australian taxpayers USD$2Million, but it managed to protect the Australian pearl industry. But in doing so the decision had to be made to close the harbour and use chemical treatments that severely impacted even native species. Almost in reverse, it is perhaps too late now to stop the Chinese ‘Golden Mussels’, which arrived in South America five years ago, and are devastating the fresh water habitat throughout Brazil, heading for the Amazon basin and closing down hydro-electric plants on the way.

Most of the credit for the PureBallast development goes to several Swedish organisations and businessmen, who as a group seem to have the most responsible attitude to such problems. The Wallenius shipping line and group, http://www.walleniuswater.com, pioneered the development that has now been taken up by Alfa Laval, adding the PureBallast water treatment system capability to the many other ship borne bilge water (oil and waste) and sewage discharge treatment systems that they supply.

The PureBallast system uses the action of high intensity broad spectrum light sources on titanium (catalyst) baffles in the bilge water flow, both on intake and discharge, producing hydroxyl ions that oxidise organic matter, viruses, plankton etc. Compact enough for a ship installation, no moving parts, quite a lot of energy consumption, it looks like the answer, and is almost through the necessary several years of testing. The technique is the same as that used for self cleaning windows on sky-scrapers, windscreens etc, that use the power of sunlight on a titanium based film as the catalyst. Once Alfa Laval have perfected this application, it will be interesting to see what the next developments will be in the application of the technology.

Alfa Laval launch ballast water treatment system

Alfa Laval, the market leader in separation, heat transfer and freshwater generation, has released PureBallast, the first viable system for preventing the transport of potentially invasive species via ballast water.

The historic launch was marked by a symposium in Greenwich, England, at which top representatives of the global shipping industry were gathered.

Alfa Laval chose Greenwich, England – a site forever associated with the marine chronometer – for the release of PureBallast, its groundbreaking and chemical-free system for ballast water treatment.

PureBallast, whose technology was developed in cooperation with Wallenius Water, arrives more than two years in advance of International Maritime Organization (IMO) regulations to prevent the transport of potentially invasive species.

The system, which forms the crowning jewel in the growing Alfa Laval environmental portfolio, was presented today at a PureBallast Symposium at the Old Royal Naval College in Greenwich.

In attendance were leading figures from the global shipping industry, as well as officials from IMO and DNV.

The symposium, which was a full-day event, featured presentations and keynote addresses from DNV, Wallenius Marine and Alfa Laval.

The problem of invasive species has long been a matter of international focus.

Species transported via ballast water from one ecosystem to another have devastated marine life, collapsed local businesses and economies, and necessitated billions of dollars in control measures.

IMO legislation designed to combat the problem is set to take effect in 2009.

Until now, however, no treatment system has been commercially viable or able to meet the proposed requirements without chemicals.

“The PureBallast chemical-free technology is unique,” says Peter Carlberg, General Manager of Alfa Laval Marine and Diesel, “in that it solves this environmental problem without contributing to another”.

The choice of Greenwich for the launch of PureBallast was no coincidence.

The village, now part of London, was the site at which John Harrison fixed his measurements of longitude when he invented the marine chronometer.

While PureBallast is designed to protect the world’s oceans rather than help in navigating them, its impact on the shipping industry has the potential to be as sweeping and as positive as the chronometer was, in its time.

“The launch of a viable, chemical-free ballast water treatment system is as critical for the industry as it is for the world’s fragile marine ecosystems,” says Carlberg: “Now that PureBallast is commercially available, shipyards and ship owners can finally begin ensuring their compliance with the stringent IMO regulations soon to take effect”.

Like other products in the Alfa Laval environmental portfolio, PureBallast is compact and designed for real-life conditions at sea.

While removing micro-organisms to IMO-compliant levels without the use of chemicals, it accommodates the short and long-term needs of shipyards, ship owners and ship operators.

“In developing PureBallast together with Wallenius Water, we’ve been careful to look at both local and global requirements,” says Carlberg: “Though the transport of invasive species in ballast water is a worldwide issue, it is individual ships that must carry the solution.

Simple installation, a small footprint, operating economy and ease of use are all essential factors that are just as important as IMO compliance”.

PureBallast, which has met the stringent IMO ballast water requirements in pilot tests supervised by Det Norske Veritas (DNV), is well underway with the year-long official approval process.

Moreover, its ability to perform at sea has already been confirmed in three years of full-scale on-board tests, in one of the ships of the Wallenius Wilhelmsen Logistics line.