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BUNKER INDEX :: Price Index, News and Directory Information for the Marine Fuel Industry
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Navigazione Montanari ship achieves 30% bunker savings in two-year project

Savings realized thanks to modification for reducing the fuel consumption of Alfa Laval Smit Combustion inert gas systems.

Updated on 28 Mar 2017 10:37 GMT

Alfa Laval says Italian shipping company Navigazione Montanari S.p.A. recorded average bunker savings of 30 percent in a two-year project, thanks to its Automatic Fuel Efficiency Module (AFEM) - a new modification for reducing the fuel consumption of Alfa Laval Smit Combustion inert gas systems. The AFEM is said to cut costs by ensuring the inert gas that keeps cargo safe during offloading is only generated in the exact amounts required.

Based in Fano on the Adriatic Sea, Navigazione Montanari owns and manages a fleet of 21 tankers. It operates worldwide, with a particular concentration throughout the Mediterranean region.

In recent years, Navigazione Montanari has been focused on improving environmental standards, especially with regard to minimizing CO2 production and fuel waste.

Valle di Navarra, a 40,000-dwt product carrier built in 2002, was selected as the test vessel for the project. The ship primarily sails in the Mediterranean, with gasoil and gasoline cargo. Compared to similar vessels with Smit Combustion systems, the Valle di Navarra discharges frequently - up to three times per week - which provided Alfa Laval with ample statistical information on the AFEM's performance and reliability.

Taking no risks with critical equipment

Data collection was one reason that Alfa Laval decided on a particularly long pilot program, but guaranteeing the cargo's safety and reliable availability was even more crucial.

"The AFEM modification is part of the inert gas generator's combustion control circuitry," said Mart Blankert, Manager Customer Support, Inert Gas Systems at Alfa Laval. "A failed module could prevent cargo from being discharged, meaning expensive delays in port. Working with potentially volatile cargo, we took our time with the pilot to ensure that everything functioned as intended."

"The AFEM was designed with capabilities for full override in case of any such problems," added Alessandro Federico, Technical Director at Navigazione Montanari S.p.A. "And although you expect some issues with any pilot project, we're glad to say that we never lost a minute of commercial operation with the AFEM."

Full support and substantial savings

Federico also pointed out the close cooperation Navigazione Montanari had with Alfa Laval during the pilot. Alfa Laval's engineers provided assistance and support to ensure the AFEM performed properly and that the inert gas system only produced the necessary amount of inert gas during offloading. This, he says, made it possible to greatly reduce the operational expenses related to inert gas production aboard the Valle di Navarra.

"With the AFEM installed, the inert gas generator capacity is constantly adjusted," explained Federico. "Purging can never be fully eliminated or avoided in practice, but an optimum setting is maintained. We can see most of the fuel savings at lower discharge rates, where they can be up to 30 percent."

Forward-thinking commitment

"The AFEM project was part of a broader goal of continuous product development here at Alfa Laval," Blankert said. "When a customer chooses one of our systems, we see it as the start of a partnership that lasts for the lifetime of the vessel. We're constantly innovating new improvements that help keep total lifecycle costs to a minimum, and we strive to make them available for existing installations as well."

For vessels with Smit Combustion systems already installed, the AFEM will soon be available as a retrofit installed and commissioned by a trained Alfa Laval service engineer. For new inert gas systems, the AFEM will be available as an added option at the time of the original installation.

Image: The Valle di Navarra.

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