Two 22,000 dwt oil products and chemical tankers on order for Sweden’s Rederi AB Donsötank will feature hull-integrated seawater cooling systems supplied by Ellingsøy, Norway, headquartered Hydroniq Coolers.
The vessels are being built by Wuhu Shipyard Co. Ltd., China, and will be delivered in 2021.
Designed by FKAB, based on a well-known low-resistance hull design, the vessels will be built to ice class 1A, LNG fueled, equipped for shoreside power connection and prepared for installation of a 1,000 kWh battery-pack.
Each ship will have a Wärtsilä 10V31 DF main engine and two Wärtsilä 8L20 auxiliary engines.
Each will also have a Hydroniq Rack seawater cooling systems
“The cooling principle of the Rack cooler secures safe, continuous and maintenance friendly cooling of the equipment onboard the vessel in addition to being very energy efficient. Low maintenance requirements translate to lower operating expenditure for Donsö Shipping,” says Håvard Tveitane, sales manager at Hydroniq Coolers.
The Rack seawater cooler is integrated in the hull below the main engine room of the vessel. Marine cooling systems are utilised to reduce temperatures in the ships’ engines and other auxiliary systems through use of seawater.
The Rack system is designed to increase intervals between each clean and reduce cleaning time when cleaning is necessary. It does not require dry-docking for maintenance and cleaning as the coolers can be extracted from below the engine room, even while at sea.
The seawater cooling system for the new tankers will also feature a dedicated chilled water bundle. This bundle allows seawater to bypass the chilled water unit and directly into the Rack cooler when the seawater temperature is below 14 degrees Celsius.
“This ingenious solution cuts energy consumption considerably, plus it further reduces maintenance requirements on the system. We are proud to be a supplier for these vessels,” adds Tveitane.