BWTS SENSORS ANNUAL CALIBRATION AS PER VGP

Is it accepted the vessel’s crew to proceed with the annual BWTS sensors/probe calibration as per VGP 2013 requirements? Or maker is required? What kind of report may be requested as evidence in case of a 3rd party inspection at USA?

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Hi @AngelikiK ,

The VGP reads as follows.

Quote
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 or when warranted based on device drift from a standard or
calibrated setting. EPA expects many sensor types (e.g., pH probes, TRO sensors, turbidity
sensors) will need to be calibrated on a more frequent basis. Calibration of the sensors and
equipment can be conducted on-board the vessel or they can be removed and shipped to the
manufacturer or other vendor for calibration. During the period when the sensors are not
installed (or otherwise inoperable thus significantly compromising the performance of the ballast
water treatment system), the vessel must not discharge ballast water.
Unquote

So in that respect, the calibration can be performed onboard by ship’s crew, provided the vessel is equipped with appropriate equipment (flow regulators, gas bottle etc.). However, many shipowners’ have agreements with BWTS makers’ pertaining to annual maintenance of the system and training were calibration of the sensors can be performed by attending service engineer.

In terms of reporting, a plain entry on PMS or a ship’s certificate (with corresponding evidence, photos, extract from maker’s manual) would suffice.

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Thank you Andrea!

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