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DNV GL Nod to Sea Sentry Wash Water Monitor

Photo: Chelsea Technologies

Posted by Michelle Howard

Chelsea Technologies, a leader in the design and manufacture of sensors for the maritime sector, and a Sonardyne company, has announced that its Sea Sentry wash water monitoring system for ship exhaust gas cleaning systems has been awarded type approval by DNV-GL.

This accreditation, combined with certification for its measurement protocols from Class NK and DNV-GL, assures shipowners and operators that all available measures have been taken to verify that Sea Sentry provides accurate and robust data on compliance with IMO Annex VI wash water discharge regulations. It also underpins Chelsea Technologies' commitment to achieving Class accreditation with type approval for all of its systems, ensuring the highest standards in quality and accuracy are upheld.

It is essential that wash water discharge is monitored at all times. Doing so allows shipowners and operators to prevent discharges that may exceed regulations and damage the environment through the impact of contaminants such as organic carbon, black carbon, polycyclic hydrocarbons and heavy metals. Accurate wash water monitoring allows owners to mitigate the risk of potential fines and costly delays in port. For scrubber manufacturers, installing monitoring technology with their units provides reassurance to shipowners making a significant investment in scrubbers that they have the capability to monitor and manage wash water and compliance in a simple and efficient way.

Sea Sentry provides a fully autonomous wash water monitoring system which monitors both the water inlet and outlet of wet exhaust gas scrubber systems. The system has the ability to accurately measure the polycyclic aromatic hydrocarbon, absorbance, turbidity (to ISO 7027: 1999), temperature and pH of scrubber wash water. The system can accurately monitor wash water from open-loop, closed-loop and hybrid scrubber systems, setting the gold standard for accurate wash water monitoring.

In addition to type approval from DNV-GL, Sea Sentry and the methodology employed to accurately analyse wash water has been accredited by DNV-GL and Class NK, following extensive testing to ensure that Sea Sentry meets the required standards regarding calibration range, drift, accuracy, precision and noise, as well as the influence of turbidity, UV absorbance, temperature and salinity. The effectiveness of Sea Sentry's mitigation method against air bubbles has also been demonstrated to the satisfaction of DNV-GL.



Jun 25, 2019

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