A deckhouse-mounted version of Alfa Laval’s PureBallast 3 Ex ballast water management system (BWMS) has been validated for product tankers with Framo ballast pumps. The development was announced just a few days before the company revealed orders from product tanker owner Torm for 47 PureBallast 3 Ex systems.
The arrangement has been developed to address the ballasting arrangements found in modern product tankers, which use submersible in-tank ballast pumps to eliminate the ballast pump room and create more space for cargo. As a result, their ballast water treatment systems must often be installed in a deckhouse, Alfa Laval explained in a statement, but the filter backflushing sequence may require water pressure in excess of available pressures from today’s standard ballast pumps.
“The situation is a Catch-22 for owners of product tankers, who may have to alter a functioning pumping system to support ballast water treatment,” the statement quoted head of Alfa Laval PureBallast Anders Lindmark.
However, “working together, the technical teams for Framo pumping systems and Alfa Laval ballast water treatment systems have developed a deckhouse solution that removes this headache,” he said. This allows an Alfa Laval PureBallast 3 Ex to be installed on deck without changing the ballast pumping system on board. The solution has been reviewed by DNV GL at Framo’s pump testing facility and validated for use on product tankers.
Instead, the equipment in the deckhouse includes a booster pump. Modifications have also been made to the BWMS ensure that sufficient backflushing pressure will be generated by the ballast water treatment system itself. In its statement, Alfa Laval said that these modifications “fall within the current US Coast Guard type-approval and revised IMO G8 certificate [so] no additional certifications are necessary.”
Alfa Laval distributed the photograph shown above with its statement but later (18 September) clarified for BWTT that it does not show an actual installation of the new deckhouse.
• Alfa Laval has secured a fleet agreement from product tanker owner and operator Torm to install Alfa Laval PureBallast 3 Ex systems on 47 product tankers, one system on each vessel. They will not be the new deckhouse version described above.
Retrofits account for 36 of those orders, supplying large-flow BWMSs. The other 11 will be installed on newbuildings in China and the whole project will be delivered over a five-year period from 2019 and 2024. Each installation will include connectivity units to provide remote access to its operational performance data.
Torm already has experience of using Alfa Laval BWMSs and Alfa Laval’s statement quoted Torm head of technical division Jesper Jensen as saying “the system’s high performance, in combination with Alfa Laval’s global presence and service offering, will mean compliance security for our vessels.”