Six tugs built for the Polish Navy in Poland have Blokland box coolers and Evac’s marine growth prevention system installed
Remontowa Shipbuilding in Gdansk has built six tugs to support Polish naval ship dockings, ship towing, rescue operations and pollution control along the Baltic coast. They were built as part of the Polish Navy’s B860 programme with a bollard pull of 35 tonnes.
The fifth of these ice-class tugs, H-3 Leszko, was delivered in February 2021 and the final of this series, H -13 Przemko, completed harbour acceptance tests in April. Other tugs in this series have already been completed – H-12 Semko , H-11 Bolko , H-1 Gniewko and H-2 Mieszko.
They all have a pair of Rolls-Royce MTU diesel engines driving two Schottel rudderpropellers, Blokland Non Ferro box coolers and Evac’s marine growth prevention systems (MGPS) to protect the coolers from bio-fouling.
Evac subsidiary Cathelco co-ordinated the contract for the MGPS installations. MGPS ensures engines are cooled efficiently and reduces maintenance costs throughout their operational lives. Commissioning of the latest systems was undertaken by engineers from Marine Center, Evac’s agent in Gdansk.
“The system has a long record of effectiveness in preventing marine growth on the heat transfer tubes of box coolers,” said Blokland Non Ferro sales manager Bram Fase.
“This helps to achieve greater sustainability by improving fuel economy and reducing the need for unscheduled maintenance,” he said.
Evac’s MGPS system consists of pairs of copper and aluminium anodes which are mounted in the seachests and fed with an electrical current. In operation, the copper anodes produce ions that are carried by the flow of seawater and create an environment where the larvae of barnacles and mussels do not settle or grow. The concentrations of copper are around two parts per billion and have no effect on the wider marine environment after discharge.
“Marine growth in box coolers and seawater pipework can be costly and time consuming to remove,” said Cathelco lead project engineer Garry Churm.
“But through the protection provided by the MGPS systems, these maintenance costs are eliminated while ensuring the box coolers operate with optimum effectiveness,” Mr Churm said.
In 2020, Cathelco won an order to deliver an MGPS for a new multi-purpose oil spill response and towage vessel built for Kuwait Oil Co by Uzmar Shipyard in Turkey.
Tug design, construction and harbour towage will be discussed during Riviera Maritime Media’s series of virtual webinars, forums, conferences and technology days in 2021 - use this link for more details and to register on the events page