through the UV chambers for a second time before it is discharged from the ballast tanks to guard against any regrowth of organisms in the water. Richard Woolley, publicity manager,
Cathelco, explains that each UV unit is a twin chamber with two lamps. “This compact arrangement causes the ballast water to flow along one side of the chamber and then along the other – doubling the UV exposure. As a result, the BWT system has one of the smallest UV chambers on the market.” A UVT sensor measures a sample of the
seawater before it is passed through the UV chambers. Te sensor measures the light transmittance of the seawater and sends a signal to the control panel which raises or lowers the power to the lamps. “Some systems simply measure the
turbidity of the seawater – the amount of sediment contained within it. In contrast, our UVT sensors measure transmittance – the
The helix flow through the UV chamber ensures that more of the seawater’s surface is directly exposed to UV light
amount of UV light actually passing through the water,” notes Field. This ensures that the UV dose can be
continually adjusted and optimised to handle different water qualities and ensure that organisms are rendered harmless. An additional benefit of the automatic power level adjustment is that power usage is optimised, with an overall lowering in
consumption. Readings from the UVT sensor are automatically recorded, providing the owner with proof that the system is operating according to specification.
Maintaining performance A cleaning method must be employed to maintain the level of the UV transmittance within the UV chambers of the BWT system.
Provide your crew with mobile and effective
Man Overboard Recovery Systems.
Markusnet Type MS is designed for man overboard recovery on all
Markus MOB Boat Rescue-net
installations and dams with less height
from water level platform.
Markus Scramble-net/Cradle Type SCN is a mobile light weight recovery system for deck vessels and offshore installations. Easy fastening to rail or inside
bulwark. Space consuming and effective
manually operated recovery system. Also for use with crane.
Markus MOB boat rescue-net is light, quick
Markus MOB Scramble-net
fastening, takes little space, provides easy and fast method to place the casualty in the net, is soft but firm around the casualty, provides easy lift by one or two persons and is easy to repack after use.
upto
types of ships, offshore than 40 metre deck
rescue or
Markusnet type MS
Tel: +354 565 1375 - Fax: +354 565 1376 - Email:
sales@markusnet.com -
www.markusnet.com Man Overboard Safety and Rescue is our Concern and Specialty.
Markus Lifenet Ltd. - Hvaleyrarbraut 3, IS-220 Hafnarfjordur, Iceland Ship & Boat International May/June 2013 59
Feature 3
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