The Wärtsilä AQUARIUS® UV Ballast Water Management System (BWMS) was installed onboard the Twister, a Chemgas BV owned LPG carrier, as part of the Type Approval process.
The Twister is designed to transport gas and chemical products along shallow rivers. A fast BWMS installation process was therefore essential to reduce the downtime impact on the vessel’s operations. For retrofit applications and upgrades, where space availability can be a determining factor, the modular configuration of Wärtsilä’s AQUARIUS® range was a particular advantage and the entire installation process took just 3 weeks.
With the trial period successfully completed, and full compliance with the IMO D2 performance standard had been demonstrated, the Wärtsilä AQUARIUS® was awarded Type Approval in accordance with the requirements of the 2004 IMO Convention for the control and management of ships’ ballast water and sediments. The Wärtsilä AQUARIUS® UV was the first BWMS to have been fully endorsed and type approved by the Flag Administration of the Netherlands.
The vessel is also equipped with the Super Trident Sewage Treatment Plant ST1A, certified to meet IMO MEPC 159(55) guidelines. Optimised for the treatment of black and grey wastewater flows, and suitable for conventional gravity and vacuum fed collection systems, the Wärtsilä Hamworthy Sewage Treatment Plant is controlled automatically. This allows unattended operation, with reduced maintenance requirements and lower long-term operating costs.
Twister, LPG Tanker, 2010