Hyundai Mipo Dockyard, based in Ulsan, South Korea, has succeeded in developing new technology that can prevent marine ecosystem disturbance caused by ballast water. The ‘Ballast-free’ concept will be introduced to the 7,500 cubic meter LNG bunkering vessel being built for Bernhard Schulte, a German shipping management company. Construction commenced November 2017.
‘Ballast-free’ refers to a new-concept vessel that does not require a separate ballast water treatment system (BWTS) by shutting off the discharge of ballast water, which is considered to be the main cause of disturbance of marine ecosystems due to transported organisms. Dispensing with the BWTS also reduces costs because mandated maintenance of the system is not required.
The IMO brought mandatory installation regulations for shipbuilding water treatment systems (BWTS) into force from September 2017. For ships currently in operation, the ship has been equipped with ballast water to balance the ship when the cargo is not loaded. The ballast water is discharged through the ballast water treatment system in the course of loading the ballast and arriving at another coastal port.
The technology developed by Hyundai Mipo Dockyard first moves the residence located at the rear of the ship forward to minimize the difference between the draft and the stern’s draft depth, Deadrise, bottom slope, to ensure stability without equilibrium.
As reported by vpoglobal.com, the LNG on-board the vessel will be stored in two independent IMO type-C tanks, which are designed to contain the LNG with a minimum temperature of minus 165°C and maximum vapour pressure of 3.75 bar(g). The LNG will be able to be transferred to an LNG-fuelled vessel at around 1,250 m3/hour through the cryogenic flexible hoses without ballasting and/or de-ballasting. The natural vaporising gas from the bunkering vessel and the returned boil-off gas from the LNG-fuelled vessel will be compressed up to 220 bar(g), stored in two sets of 40 feet containers and used for fuel and electric propulsion.
Hyundai Mipo Dockyard officials said, “By developing a new concept ship that can meet environmental regulations without additional cost, we are able to strengthen our competitiveness in eco-friendly shipbuilding orders. We will continue our research so that we can continue to do so.”
The LNG bunkering vessel is expected to be delivered to Bernhard Schulte around September.
Source: Hyundai Mipo Dockyard
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