Azimuth thrusters change the way operators move cargo

Over the years, the use of azimuth thruster has changed the way operators do business. The increased maneuverability and efficiency gains allow tug operators to do more with the same installed power. Added maneuverability can also play a role in improving safety during certain operations.  With more than 50 years of developing and manufacturing azimuth thrusters, Rolls-Royce has learned a lot about the specific propulsion requirements of different types of ships and floating structures. Working close with the customers has been a key element of the success.

Steerable azimuth thrusters have come a long way since the first one went into service in 1965. With just 80 hp of thrust it was installed on a mud hopper barge in Finland to make it self-propelled. The first azimuth units specifically designed for inland waterway applications were delivered in 1976. They powered a series of three-river push boats built in Holland and are still operating today.

With the aid of modern computer-based design tools and a detailed understanding of hydrodynamics, Rolls-Royce is continuously developing and improving its thruster product range. The current product portfolio covers a power range of 300 to 14,000 hp.

The benefits of Azimuth thrusters on a towboat
With an azimuth thruster the full thrust can be applied in any direction through the full 360 degrees and significantly improve the maneuverability and braking force of the vessel. In performance tests it has been shown that the braking forces produced are nearly 1.5 times those of the conventional towboat, over the whole speed range. This increase in braking force reduces both the distance and the time needed to stop a barge train.

For shallow draft operations, the normal requirement is to fit 2 azimuth units, and it is not unusual to have towboat designs with a triple azimuth thruster propulsion arrangement.

Azimuth thrusters also significantly increase flanking forces, which help operators safely navigate through the most difficult bends of the river. On a conventional towboat, flanking rudders and reverse thrust are normally used to produce the necessary flanking forces. By using azimuth thrusters the transverse force can be maximized and is approximately twice the maximum side force produced by a conventional towboat at all measured speeds, plus there is the benefit of greater braking forces. Maximum flanking forces produced can be up to 4 times that of the conventional towboat with equal braking force.

How Azimuth thruster help in Brazil
Brazil is a country traversed by many rivers, the main one being the Amazon. There are 11 main inland waterways with a total length of some 39,000 miles although only approximately 8,000 miles are regularly used. These waterways are used to transport agricultural commodities such as grain and fertilizer, as well as mineral goods to the coast.

Amaggi Navegação a subsidiary of Amaggi Exportação e Importação Ltda. is one of the operators working in the region who has moved to azimuth thrusters to propel their vessels. They have been operating on these waterways for over 20 years and now have over 30 tugs equipped with azimuth thruster propulsion. Units in their fleet include a range of Rolls-Royce thrusters from our smaller US 105 model to our larger US 255’s.

Amaggi Navegacao operate on the Madeira and Amazones rivers where they are involved in the transportation of grain and soya to and from local processing plants. The move away from conventional towboat design has enabled them to increase the size of barge trains, which is due to increased turning and stopping capacity at full load.

Open propeProp2llers are used for the majority of these thruster applications due to the amount of debris in the rivers. The trend outside the Amazon is to fit azimuth thrusters with nozzles and thereby maximize thrust.

The future of Azimuth thrusters
Thruster technology continues to develop. The latest is the introduction of gearless electric drive through the application of permanent magnet (PM) rim drive technology, where the motor surrounds the propeller as a slim ring. The rotor is integral with the propeller and carries a series of permanent magnets. As the magnetic fields interact, the propeller turns. Tunnel thrusters and azimuth thrusters utilizing this technology are now available from Rolls-Royce. The compact and efficient tunnel thruster unit is easy to install and power output is increased by around 25% for the same propeller size. It is a good example of the possibilities that lie ahead.

This technology has now been applied to the azimuth thruster by Rolls-Royce, and the first PM development thrusters rated at 670 hp were installed on the research vessel R/V Gunnerus in March 2015. Nozzle shape can be selected to suit individual applications, but since Gunnerus requires pull for towing trawl and other gear, the nozzle is optimized for bollard pull and speed to match the vessel’s requirements. The installation is compact with only the slip ring unit and the variable frequency steering motors inside the hull.

Before the installation, the vessel had a conventional diesel electric propulsion system consisting of frequency converters, induction motors, gears and shaft with nozzle propeller. Testing to date has demonstrated an improvement in propulsive efficiency and bollard pull with a reduction of air and structure borne noise and vibration.

 

 

VGM: FMC Chairman says just use weight determined at gate

JUNE 17, 2016 — With the implementation date for new container weighing requirements 14-days away, Chairman of the Federal Maritime Commission Mario Cordero says the time has come for ocean carriers to

Best practices in choosing and maintaining EALs for marine applications

With the U.S. Environmental Protection Agency’s Vessel General Permit (VGP) regulations in place for several years now and Small Vessel General Permit (sVGP) poised to expand these regulations to new classes of vessels, marine operators have embraced the use of environmentally acceptable lubricants (EALs) and become familiar with the inherent environmental and performance benefits of switching from conventional lubricants.

However, there is still a great deal of confusion in the marketplace surrounding EAL choice and maintenance. It’s important for operators to educate themselves on which type of EAL is best suited to different applications and strategies for maximizing ROI and equipment life.

The EPA recognizes four types of EALs. While all meet requirements, these lubricants vary widely in terms of suitability for different applications, performance characteristics, and fluid life, among other considerations. While all EALs offer the advantage of being high viscosity index lubricants (High-VI), it is important to cut through confusing and oftentimes contradictory marketing claims to understand the relative advantages and disadvantages of each type, based on its chemical composition.

Getting the Water Out: Emulsifying Versus Demulsifying Fluids
Another critical decision factor in EAL choice is how the lubricant interacts with water. In marine environments it is not a question of whether, but how and how much water will enter a hydraulic system. While some operators choose to use emulsifying fluids that can essentially absorb this water, recent studies have shown that the presence of water in the system, even if it has been emulsified, serves as a catalyst for oxidation and hydrolysis – the formation of acids that corrode and damage the system. These same studies suggest that the use of demulsifying EALs – ones that separate the water from the fluid for easy extraction – have the potential to greatly extend equipment service life and performance. Like conventional oil, HEPRs have the best demulsifying properties, making them a great choice for marine applications.

Choosing Wisely
The chart below provides information on the specific properties and performance attributes of each type of EAL, as well as standard petroleum based lubricant, to help guide your decision-making.

  HETG HEES                 HEPG HEPR Standard Petroleum
Readily Biodegradable Yes Yes Yes Yes No
Ecotoxicity Low Low Low* Low High
Bioaccumulation Potential No No No No Yes
Sheen No No No No Yes
Seal Compatibility Good Good Poor Good Good
Wear Performance Very Good Very Good Very Good Very Good Very Good
Oxidation Performance Poor Good Very Good Very Good Very Good
Low Temperature Performance Poor Very Good Very Good Very Good Poor
Viscosity Index Very Good Very Good Very Good Very Good Poor

*Solubility may increase the toxicity of some PAGs

Best Practices for Extending Fluid and Equipment Life and Maximizing ROI
Choosing the right EAL is only half the battle; measuring the effectiveness of your chosen lubricant and instituting a proper maintenance regime is essential to ensuring performance, protecting your equipment and getting the most for your money.

Maintenance Protocols
In addition to establishing performance benchmarks, logging all issues and causes of downtime, making timely repairs and establishing a regular change out schedule, cleanliness control is one of the single most important and often overlooked aspects of effective lubricant maintenance.

To ensure cleanliness and avoid contamination, refill or dispense only from clean, sealed containers. It’s also important to follow OEM recommendations, establish a set protocol and document all maintenance, including fluid top-offs.

Oil Analysis
Oil analysis, another critical component of maintenance, is the laboratory analysis of a lubricant’s properties, suspended contaminants and wear debris to provide a snapshot of how fluids and equipment are performing at a given time and over time. This analysis is performed by capturing oil samples during routine predictive maintenance to provide meaningful and accurate information on lubricant and machine condition. By tracking oil analysis sample results over the life of a particular machine, trends can be established which can help extend equipment, eliminate costly emergency repairs and increase uptime, all of which results in significant savings.

If you do not currently have an oil analysis program in place, here are some tips to get started:

If you have questions about choosing the right EAL and maintenance practices for your operation, application and needs, the best place to start is to contact your OEM and possible vendors. At RSC Bio Solutions, we work closely with our customers to set up customized programs and solutions and continue to make recommendations based on regular results to help our customers protect their equipment, their workers and the environment. For more information, please visit www.rscbio.com.

How are tankers valued?

The birth of VesselsValue was driven by timing and need. In 2008, the crisis in the financial market extended into shipping. The dry bulk sector and the containership sector were hit the hardest, and while tankers remained relatively buoyant, banks needed to assess their capital commitments against the value of the assets being financed and being used as collateral. However, in the depth of the crisis (2010 / 2011), ship brokers were telling clients they could not value the ships as there had been no recent sale or “last done” in ship broker speak. Richard Rivlin, a sale and purchase broker with 30 years’ experience, had long felt that an automatic valuation system could be built, which would produce valuations in any market, at any time. Luckily, his brother is a Professor of Mathematics, and together they designed and built such a system. It quickly became apparent that the highly detailed multi-level regression model was far too complex for normal spreadsheets, and a specialist modelling company was employed to develop the model.

The model is fed by two databases. One contains the features and specification of the ships arranged in a unique structure that allows the computational model high speed access. This database is researched and compiled by VesselsValue own team of 30 researchers and analysts on the Isle of Wight in the UK. The second database consists of sale and purchase transactions and charters. Both feed the mathematic model which is operated by a team of quantitative analysts. The aim was to produce an instant, accurate and always available online ship valuations for the banks and finance houses, that form the main customers of VesselsValue.

Tankers Valuation
According to VesselsValue, five factors make up a valuation:

  1. Type (VLCC, Suexmax and so on)
  2. Features (shipyard, hull, and so on)
  3. Age
  4. Cargo Capacity
  5. Freight Earnings

Each factor is broken down into further elements that are scored. As an asset, tankers are relatively straightforward, being highly commoditized, and standardized in terms of size ranges and specification. In part this is due to the international safety and pollution control legislation that has been forced on the tanker sector. This level of standardization makes VesselsValue task somewhat easier when it comes to scoring the factors, than offshore vessels, which have just been added to the system. In the case of tankers, there are around 140 scores. One of the most important scores is the shipyard. A vessel built in China is less desirable than one built in Japan. A well-published example is the one shown above. In November 2014, the New Century-built Supramax bulker ACS Diamond was sold for $10 million. The previous week, the slightly older Japanese-built pair of Supramaxes were sold for $15.5 million each. This was an implied discount of around 40% between Japan and China. However, the shipyard scoring goes into several levels of sophistication, including many ships the shipyard has built and when the last vessel was constructed.

This model is continually updated and recalibrated overnight to give the closest possible fit to the reported sales prices. It is the analysis of the sales that can produce the weightings required for different shipyards. These are applied to all shipyards, not just Chinese shipyards.

So far VesselsValue have performed over 1,000,000 valuations to date, about 400,000 a year and the number is increasing.

How Accurate is VesselsValue?
The split of VV customers are banks and finance houses, owners and other maritime industries such as lawyers, insurers and charterers – sophisticated market participants who insist on knowing the methodology behind our valuations. But ultimately they want to know how accurate are our valuations because this will affect their bottom line. Valuation accuracy is assessed as the difference between the price a vessel is sold at, and VV valuation on the day before the actual sales date. This is expressed as a % of valuations within a certain band of accuracy and shown in a chart form. The accuracy report is available on the website.

Tanker Valuations Development
According to the VesselsValue transactions database, between the start of 2012 and May 2016, a total value of $143 billion of tankers have been traded on the sale and purchase market. During that period the value of second-hand tankers has steadily increased, as can be seen from figure 1 (“VV Tanker Matrix”) below of the VV Tanker Matrix, expressed as USD / DWT.

During that period, the MR tanker has been the most frequently traded tanker type, both in terms of number of sales, and value (see figure 2 “Total Value by Type of Tankers Sold 2012 to Date”).

So far in 2016 (to 15 May 2016) 83 tankers with a total value of $1.4 billion, have been traded on the second-hand market, and again the MR tanker is the most popular (see figure 3 “Value of Tankers Sales Jan 2016 to YTD).

Interestingly, the average age of MR2 (Chemical / Product) tankers sold in the first five and half months of 2016 is only three years-old. Altogether 17 of these vessels were sold in this period, with eight tankers being sold by owners in the USA (these were not Jones Act vessels).

The majority of tankers and the largest value of tankers sold so far this year (2016) were constructed in South Korea, followed by Japan and China. As far as owners are concerned, the lead seller across all types of tankers was Chembulk Tankers, Scorpio Tankers and companies associated with the Navig8 group (see figure 4 “Top Ten Sellers of Tankers Ranked by Number of Vessels Sold”).

Recent Sales of Interest
The top three sellers have sold tankers for completely different reasons and strategy. In January 2016, Chembulk Tankers was sold by parent company Berlian Laju Tanker (BLT) to private equity investor Kohlberg Kravis Roberts (KKR). Chembulk Tankers is said to have a number of Contracts of Affreightments (CoAs) and the older tankers were surplus to requirement. This is part of the KKR growth strategy to rebuild the Chembulk Tankers fleet. KKR has also invested in a fund to invest in two Greek bank shipping portfolios.

The number two top seller, Scorpio Tankers, was a tactical, opportunistic sale. The purchaser, Bahri (formerly known as National Chemical Carriers of Saudi Arabia) is on something of a buying spree. Bahri has recently purchased two VLCCs from Tanker Investments in December 2015, for a reported $77.5 million. The five 2014-built MR2 tankers were sold en bloc for $167 million are trading in the UAE under Bahri CoAs.

The third most active seller, Navig8 Chemical Tankers, Inc., sold the four resales (the MR2 tankers are due for delivery in 2017) under a ten-year bareboat charter (with purchase option) for a reported $35 million each. This was an internal sale within the group, and part of a longer term strategy.

USMMA suspends traditional Sea Year

JUNE 17, 2016 — The U.S. Merchant Marine Academy, Kings Point, NY, is suspending the traditional Sea Year — actually a period in both sophomore and junior years when midshipmen are assigned

John Parrott named President of Foss Maritime

JUNE 17, 2016 — Seattle based Foss Maritime Company reports that Chief Operating Officer John Parrott will take over the role of President, assuming responsibility for the day-to-day operations of the company

Incat Crowther design for New York’s Citywide Ferry system

June 16, 2016 — New York City has released the initial renderings of the ferries for the new Citywide Ferry system that will start operating in the summer of next year. Hornblower,

Ireland orders fourth OPV from Appledore

JUNE 16, 2016 — Ireland’s Department of Defence has awarded Babcock International Group a contract extension that will see Babcock’s Appledore shipbuilding facility in North Devon, England, build a fourth Offshore Patrol

Scana Propulsion books fishing vessel contracts

JUNE 16, 2016 — Scana Propulsion has signed a contract with AO Shipyard Yantar, Kalingrad, Russia, to deliver propulsion and maneuvering systems for three fishing vessels on order for VI Lenin Collective

VIDEO: Fiber rope retrofit for MacGregor subsea cranes

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