Vessel | LAUNCH AND DELIVERY Skimming the surface in Chinese waters
Te delivery of two sister pollution control catamarans to PetroChina in June is providing the oil major with a versatile means of collecting floating trash and oil at its Tianjin refinery.
major PetroChina, which intends to deploy the sister boats at its refinery terminal in Tianjin. The aluminium newbuilds, ALN 122 /123 (Elastec I/ II), were constructed at Alnmaritec’s Blyth yard in early 2011 before being sent to Elastec American Marine, which collaborated with Alnmaritec on the design of the boats and supplied their onboard oil recovery and storage equipment. The vessels made their way to China in the first week of June. The vessels form Alnmaritec’s new
U
Wave Skimmer class, building on the specifications for the previous Wave Provider class model, which the group developed in cooperation with Elastec in 2010, again for delivery to and deployment by Petrochina. Featuring an overall length of 10.8m,
a breadth of 5.2m and delivering a maximum speed of 7knots, each Wave Skimmer has been equipped with a hydraulically operated garbage scoop, situated at her bow,
K boatbuilder Alnmaritec has launched two new pollution control catamarans for oil
Each Wave Skimmer’s onboard, removable garbage skip features a capacity of 2m3
. features a capacity of 2m3 charged with
gathering floating trash. This waste is then stored in an onboard skip, which
TECHNICAL PARTICULARS ALN 122/123
Designer
......................................Alnmaritec Builder
.........................Alnmaritec / Elastec Length, oa ...........................................10.8m Beam ......................................................5.2m Displacement ........................................9.5m Max speed ......................................... 7knots Classification .......................Lloyd’s Register (hull structure) UK Maritime and Coastguard Agency (outfit / equipment)
Engines / propulsion ......... 2 x Nanni diesel engines @ 84.6kW each 2 x Hamilton 213 waterjets
24 , for later safe
disposal. The skip is removable, thus freeing up the vessels to accommodate more cargo and equipment on deck when its rubbish storage properties are not required.
Skimming process Elastec has also fitted the vessels with proprietary dynamic oil collection chambers, located in the catamarans’ double hulls, to handle oil skimming duties in the event of a leak or a spill. The oil chambers function on the priciple of what the US manufacturer describes as a ‘circus’ system. Each chamber features the capacity to store some 5m3
worth of recovered oil,
coupled to a ballast system to ensure that the vessel’s trim remains optimal throughout the entirety of the oil recovery process. Polluted water is directed into the
chamber’s centrifuge collector, situated between the two hulls, where the oil is skimmed by either weir or drum skimmers, allowing the clean water to be pumped back out of the vessel. In terms of enhanced manoeuvrability,
the vessels have been fitted with twin inboard Nanni diesel engines, each generating 84.6kW, which drive two Hamilton 213 waterjets. As well as enabling the boats to respond to clean-up operations in a swift and versatile manner, this propulsive arrangement
provides a shallow
draught for each control boat, meaning that the Wave Skimmers are capable of operating in confined, tight or awkward waters – for instance, in close proximity to beaches and ramps – thereby providing them with greater scope to act on and rectify oil spills and build-ups of junk before the problem escalates. SBI
Ship & Boat International July/August 2011
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