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The short answer is because of safety and compliance. The failure to comply with the applicable regulations can lead to severe penalties and also negatively affect the maritime environment. Below you can find a summary of the EPA and IMO requirements regarding the calibration of BWTS.
According to the United States Environmental Protection Agency (EPA) Final 2013 VGP (2.2.3.5.1.1.3), “at a minimum all applicable sensors and other equipment must be calibrated annually. Additionally, all applicable sensors and other control equipment must be calibrated no less frequently than recommended by the sensor or other equipment manufacturer, or by the ballast water treatment system manufacturer […] ”. A higher frequency in calibration is expected for many sensor types, like TRO sensors. During the time when the sensors are not installed or they are not functional, the vessel is not allowed to discharge the ballast water.
The International Maritime Organization (IMO) BWM.2/Circ.66/Rev.4 also reads that “facilities shall be provided for checking, at the renewal surveys and according to the manufacturer’s instructions, the performance of the BWMS components that take measurements.”
Once again we would like to thank you for your assistance with all changes requested prior to and during mobilization, and also let you know we are very pleased with the service provided by your company.
Many thanks for the reports and a job very well done. I have got very good feedback from the vessel both on the quality of the attending engineers and the job they performed.
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