Modern OWS systems, such as Marinfloc's EBBWCS (pictured), are able to better MARPOL requirements and can be monitored from ashore
Incidents of 'magic pipe' bypasses of oil water separators (OWS) and the heavy penalties meted out to offenders still occur with monotonous regularity. Even those tasked with rooting out the offenders are not immune from the nefarious practice, as the prosecution of a USCG officer recently has shown.
It cannot be denied that older models of OWS are sometimes inefficient, prone to breakdown and unpleasant to maintain, but if makers' claims are to be believed that is not true of newer models.
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Fairplay Solutions and Newbuildings - Magazine, October 2008