OWS - 15 ppm Alarm Threshold Check
Check whether the oil content of overboard discharge from the 15 ppm Oily Water Separator is compliant with MARPOL Annex I Reg. 14 - assumes bilge holding tank, OWS flow rate, and alarm settings.
Discharge status
Compliant
Formula, assumptions, and limits
$$\text{ppm}_{effluent} < 15, \quad t_{cal} \leq 12\,\text{mo}, \quad V_{3-way} = \text{fail-safe}$$
15 ppm equipment per MEPC.107(49). 12-month calibration per Annex I Reg. 14. If IOPP-certificate vessel > 400 GT, ODME is separate for cargo/slop.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $ppm$ | Oil content in effluent | ppm | OCM/PPM sensor |
| $t_{cal}$ | Calibration age | months | service certificate |
| $V_{3-way}$ | 3-way recirculating valve | - | maker manual |
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