The latest version of the Cathelco BWT system is currently being tested to the ‘live/dead’ standard demanded by the U.S. Coast Guard with the aim of gaining Type Approval by the 3rd Qtr of 2017.

The Evolution system will supersede the Cathelco Mk 1 system which holds IMO Approval and AMS Certification.

The independent laboratory appointed to supervise the USCG Type Approval testing programme is Lloyds Register.

Shipboard testing commenced in August 2016 and it is anticipated that all of the test results will be submitted to the U.S. Coast Guard for approval by the end of the 1st Qtr 2017.

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Features of the Evolution system

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Enhanced UV chamber design

The chamber has been re-designed to increase the level of irradiation to meet the ‘live/dead’ standard, whilst other improvements extend the exposure time with the sea water. In addition to creating a helix flow as the water enters the chamber, its path is interrupted to cause a lateral movement. This brings organisms from the edge of the flow into closer contact with the light emitted from the UV lamps in a repeating cycle as the water passes along the chambers.

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Precise adjustment to different sea water qualities

The unique Cathelco UVT sensor system has already proved its value in precisely adjusting the UV dose to different water qualities. This is achieved by taking a sample of sea water before it reaches the UV chamber and measuring the amount of UV light  actually passing through it. This works in conjunction with UV intensity meters which are mounted on the chamber and measure the intensity of light which is received.

Combined with stepless power control, all of these features ensure that maximum power is only used when the circumstances demand and reduced immediately afterwards.

Footprint 50% smaller

The footprints of the skid mounted systems are more than 50% smaller than their predecessors even when the EUV panels are included. The reduction in size has been achieved by mounting the UV chamber vertically, simplifying the pipework arrangement and introducing the CIP wiper system.

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Easy switch over from IMO to US waters

One of the new features on the Evolution control panel will be a button which can be used to reconfigure the system when the ship passes from IMO to US territorial waters.

On ballasting prior to entering U.S waters and within them, the flow will be automatically reduced to 200m3/hr to meet the ‘live dead’ standard, whilst ballasting undertaken elsewhere will be at a rate of 250 m3/hr with subsequent power savings.

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Easy, intuitive system controls

The MK I control system has proved popular with ships’ engineers and will be carried over to the Evolution. With easy to read schematics showing sea water routing, read outs showing the transition state of valves as well as instant information from sensors, engineers can easily see how the system is performing.

CIP wiper system

The UV lamp sleeves are automatically cleaned after every ballasting/de-ballasting operation using an efficient wiper system.