MarFlex and Siemens have implemented a total of 42 fully electric drive deepwell pump systems for the offloading of Arctic Shuttle Tankers under extreme conditions on instruction of Samsung Heavy Industries. The oil tankers can break ice of up to one-and-a-half meters thick on their own in temperatures as low as -50 °C. The Russian ship owners, Sovcomflot, will be shuttling in the Arctic with these tankers which will be delivered during 2008 for LukOil and Naryanmarneftegaz.
The system comprise a series of loading, slop oil tank and ballast deepwell pumps by MarFlex, linked to a series of variable drives by Siemens. Their capacity varies between 220 and 390 kW. The innovative solution developed by Siemens and MarFlex comprises MarFlex Deepwell pumps (MDPs) with capacities of between 400 and 2,500 m³/h fitted with electric motors in EExd configuration, variable Sinamics drives and Simatic S7 PLCs used for control and safety. Communication is facilitated by Profibus and the installations are managed from the ships’ bridge using a Siemens operating panel. The advantage of this solution is that the installation’s production can be directly controlled and a link with the ship’s cargo computer has been established for this purpose. What is more, this concept saves 10 to 15% on energy compared to hydraulic offloading systems.
The main reason the MarFlex/Siemens combination was selected is that they have demonstrated over the years that they are able to deliver pump systems that offer a high level of reliability and an exceptional price/performance ratio. Their international footprint is also of great importance. The service desk, which is manned 24/7, offers the customer global access to MarFlex and Siemens commissioning and service engineers. Siemens is represented in 190 countries throughout the world. MarFlex has branches in Moscow, Singapore, Japan and the United States.