Cathelco’s agent in New Orleans, Green Marine and Industrial Equipment Co., has won an order to supply a ballast water treatment (BWT) system for a new offshore vessel built by Eastern Shipbuilding Group, for Harvey Gulf International Marine.
The Cathelco BWT system is based on a combination of filtration and UV technology and has a capacity of 150cu m/hr. The system has IMO Type Approval and AMS acceptance from the US Coast Guard.
The AMS approval recognizes that the system will continue to disinfect heavily silted seawater where UV light transmittance values are as low as 45% (75% being the value for normal seawater).
Cathelco’s BWT systems are available with capacities from 34cu m/hr to 1200cu m/hr in a single unit. The system automatically adjusts to different sea water qualities and uses a UVT sensor to measure UV light transmittance – the amount of UV radiation actually passing through the seawater- for calculating the UV dose.
Each unit has twin UV chambers with two lamps (100cu m/hr per lamp) and is designed to make the sea water flow along one side and then the other – doubling UV exposure. In addition, the manifolds make the water flow in a helix, to maximize the surface area exposed to the UV light source.
The cleaning system uses cleaning balls to remove residue from the quartz sleeves and internal surfaces of the chamber. This means that the system does not use chemicals and there are no mechanical parts to scratch the surface of the sleeves.
The vessel, Harvey Stone (Hull 234), is a Rampage 6400 multi-purpose field support vessel (MPFSV), with a length of 64.8m and 18m beam, is due to be delivered in Q2 2016.
Image: Ballast water treatment system/Cathelco
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