DNV

An oily water separator (OWS), bilge separator or oil filtering equipment is required by MARPOL Annex I, Regulation 14 to be installed on any ship above 400 GT. The equipment shall be of a design approved by the administration and tested and installed according to guidelines in MEPC.107(49) as amended by MEPC.285(70).

Technical and Regulatory News No. 15/2023, published in June 2023, informed about the requirement in MEPC.107(49) to install the sampling point on a vertical section of the effluent pipe, as this requirement has recently been the focus of port state control. The June news resulted in some uncertainty concerning the sampling point to which the above-mentioned requirement applies, and this news thus provides further clarifications.

https://www.dnv.com/news/oily-water-separator-further-clarifications-on-requirements-for-sampling-points-248016