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1. What type of disinfection method is it used?

The water disinfection is done through Electrolysis. An electrolytic cell is able to produce free active chlorine (TRO), used for the disinfection of ballast water, by electrolysis of seawater. A TRO concentration of 4-6mg/L as Cl2 is produced for the sufficient disinfection of ballast water.

2. Can the system components be installed at different locations and what are the requirements/limitations?

They can be installed at different locations.

For main ballast tanks in Hazardous Zone, the limitations are:

  • The T/R and control panels are installed in Safe Zones.
  • Filter, E/C, Flow Meter, TRO sensors and valves are installed in Hazardous Zones, such as P/R.

3. Does the system require other services (i.e. addition of air, ballast/fresh water etc.) to operate?  

Compressed air: 6-10 bars. In our BWTS diaphragm pump (DAP) is applied for TRO sampling.  Our standard BWTS feature, is to use 1 DAP per TRO sensor.  According to the standard feature, air consumption of the BWTS is indicated below:

  • DAP: average is 3.5m3/h and can be up to 8.6m3/h each
  • Flow control valve (FCV): 4lt/h
  • Rest of the valves: 17lt per full operation (ballast/de-ballast) Cooling Water for T/R: Tmin= 20 Celsius, Tmax= 45 Celsius, Quality: Fresh Water.

4. What is the average and maximum time to complete the treatment operations and what is the required time interval to effectively neutralize containing bacteria and organisms?

Offered BWTS are chosen according to the ballast pumps capacity of each vessel. As long as bacteria & organisms contact chlorine produced by Electrolysis, their disinfection starts instantly. As a result, the incoming water to B.T. is already treated. The remaining chlorine in B.T. ensures that no organisms’ colony will form. For eliminating any non-compliance risks we recommend minimum holding time 3-4hrs.

5. What the control system of said system consists of? What alarms are available?

Automation is based on Programmable Logic controller (PLC)

Alarms are divided into: Attention & Critical.

In case BWTS Attention Alarm is triggered the system still remains in operation but corrective action or adjustment is required by the BWTS operator.

In case BWTS Critical Alarm is triggered the system is set to OFF and the alarm is activated. The operator should check the critical alarms data log, identify the cause and perform corrective action if needed. Then by setting the main switch to OFF the alarm is reset and BWTS can be set again to ballast operation.