Feature 3 | WASTE TREATMENT RETROFITS
Wilhelmsen targets in-service retrofits for ballast water plant
Wilhelmsen Ships Equipment aims to set the standard for retrofitting when it comes to the installation of ballast water treatment systems during normal vessel operations.
product - the Unitor Ballast Water Treatment System - and this is expected to improve the system’s prospects in what is becoming a highly competitive retrofit market. According to the company, “Te system has already generated considerable interest due to its small footprint and ease of installation, enabling it to be fitted while the vessel is in operation. Tis means that the owner can continue to earn money while the unit is being installed instead of spending money to have the vessel in dry dock.” Installation while in normal operation
T
is possible thanks to modular, compact, light and robust system components. Tis generally eliminates the need for structural modifications to the vessel and makes it possible to install the components in tight spaces. Te system’s ‘in line’ design means that there is no need to split the flow into smaller streams, making the installation simpler, faster and cheaper. Te power requirement of the system
is one of the lowest in the market. For example, a system with a 4000m3
/h capacity
requires only 45kW. In most cases the vessel will have enough surplus power to operate the system. Tis reduces the need for costly and complex upgrades to the ship’s power supply. Te technology used in the Unitor Ballast
Water Treatment System was developed by South Africa-based Resource Ballast Technology (RBT). It combines the use of cavitation, sterilisation and filtration and works effectively in both sea water and fresh water. Wilhelmsen Ships Equipment have industrialised the system for the maritime market, manufactures it at its own production centre and markets the system globally.
34 The in-line design of the Unitor BWS is intended to facilitate installation on existing vessels. Te Unitor Ballast Water Treatment System
has been installed without interruption to normal operations on a number of ships, including BW Gas’ VLGC Berge Danuta. Te retrofit process in this case included installation, planning, fabricating the connecting pipework and support, and the installation itself, which
involved cutting out a section of the ballast line and fitting the system into place. Te system has gained type approval from
the South African Department of Transport (SAMSA) and Wilhelmsen Ships Equipment and RBT are currently engaged in gaining DNV approval for the system. SCRT
Shiprepair and Conversion Technology 4th Quarter 2010
his August Wilhelmsen Ships Equipment received Type Approval in for its latest environmental
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