equipment
››› are initiated from a touch screen on the control panel.
Other orders call for Parat Halvorsen to deliver its MEL electrical steam boilers for tank heating on multi-purpose offshore platform vessels building at Norwegian yards, with options for a further four
Tugs and other vessels working inshore with frequent periods alongside are particularly vulnerable to bio-fouling in their seawater piping systems, a problem intensified in tropical waters where barnacles and mussels breed more prolifically. Special box cooler antifouling systems designed by UK-based Cathelco have overcome problems with bio-fouling on two tugs deployed by Rio Tinto to berth iron ore carriers in the Australian port of Dampier. Pilbara Vulcan and Pilbara Neptune experienced overheating of their box coolers, which were then extended and deliberately left with uncoated surfaces to improve heat transfer. “Rio Tinto approached us to provide a solution to the fouling problem,” explains Cathelco project development manager, Stephen Ellis, “but as the box coolers were uncoated and electrically isolated from the sea chests they also wanted to be sure that the antifouling system would not cause corrosion problems in the future.” The resulting Cathelco system on each tug will protect nine box coolers against the mussel and barnacle growth that can impair heat transfer efficiency.
Copper anodes, fed with an electric current from a control panel, are mounted horizontally beneath the box coolers to create an even distribution of ions when the system is in operation. The ions foster an environment where barnacles and mussel larvae do not settle or breed and are passed harmlessly to discharge.
Special perforated cathode plates which cover the anode to provide an effective earth return were designed to minimise the risk of ‘stray currents’ that could have a corrosive effect on the sea chest. Cathelco also designed a corrosion monitoring system to measure the difference in voltage between the box coolers and the sea chests to check there is electrical isolation. An alarm is registered in the event of isolation failure. • Cathelco also reports further business for its Seafresh reverse osmosis (RO) desalinators, with orders for two projects in Singapore. RO units will be supplied for the LNG carrier Khannur, owned by Golar LNG of Norway, which is under conversion to the floating storage and regasification
110 I Marine Propulsion I February/March 2012
installations. Since the plant is primarily intended to support oil recovery operations (ORO), and not for regular use, compact installations are valued.
ORO tanks for collecting oil spillage must be equipped with a permanent system for heating the recovered oil/emulsion, requiring a
Box cooler fouling countered on Australian tugs unit West Java FSRU at Jurong Shipyard for Indonesian service. Two Seafresh ‘Ton’ models will be installed, each with the capacity to produce 40 tonnes of fresh water per day. The fully automatic units incorporate water quality sensing systems for electronically testing the product water.
Another order calls for two Seafresh H2012 units for a 78.2m-long anchor handling/tug/offshore support vessel booked at Jaya Shipbuilding by Java Marine Lines. Each unit is rated for a daily output of 5 tonnes of potable water for drinking, cleaning and domestic purposes, H20-type desalinators being suitable for small-to- medium sized commercial vessels. The AHTS vessel’s units are specified with carbon filters to remove dissolved gases and improve the taste of the product water. Ultra-violet sterilisation will ensure the water is completely free from bacteria or parasites while held in the onboard storage tanks.
heat source (steam injection) positioned close to the tank suction lines to ensure the low temperature fluid is pumpable. Parat Halvorsen has delivered similar boilers for more than 60 vessels, claiming positive feedback in terms of installation effectiveness and reliability.
Desmi restructures and goes for green
Danish pump manufacturer Desmi started 2012 with a new structure based on three business units respectively covering pumps (Desmi Pumping Technology), oil spills (Desmi Ro-Clean) and contracting (Desmi Contracting). The units will all report to the parent company Desmi A/S.
Desmi pumps and pump solutions are reportedly gaining a larger foothold in marine and offshore, oil spill, industry, utility and defence and fuel sectors. A stronger interest in green solutions and energy optimisation will be pursued. Desmi Ocean Guard, for example, is developing ballast water treatment systems in co-operation with AP Møller-Maersk and Skjolstrup & Gronborg (see page 106). Desmi is aiming for a core business turnover of DKr 1 billion within the next three years, the growth primarily sought by increasing global activities as well as new sector developments. Turnover in 2011 was expected to reach over DKr 710 million (from DKr 622 million in 2010). MP
Garbarino primes pump portfolio
Two new models have been introduced by Italian pump manufacturer Pompe Garbarino for marine applications:
the SWL pump for bilge service (left) and the VL pump for main engine lubrication (right).
www.mpropulsion.com
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