9th Aug 2023, our service engineer for RWO oil water separator was mobilized for a 15ppm OMD (oil monitor device) calibration work (in accordance to MEPC 107(49). Unlike others, our calibration includes the health check of the oily water separator (OWS).
RWO GmbH's concept is, the OMD is part and one of the OWS, and should always be checked during the visit. If the calibration is only done and ignoring if the OWS is functioning, then it defeats the purpose of the service visit.
Upon visit, our engineer will visit the C/E (Chief Engineer) and request that oily water separator to be turned on and run. He will make sure that there is no error messages from the system, general condition of the OWS and OMD is visually okay, and sampling water passed the 15ppm requirement.
Next, he will check if the ship has 1 set of spare coalescer, 1 complete set of absorber polisher and other consumable parts available for replacement.
Then, he will first perform the fresh water test to make sure that the result is 0 ppm (free of any oil particles)
Our engineer once completed the 0 ppm test, will prepare the test liquid (genuine part from DECKMA) to perform another 2 tests with pre-determined mixture and results. In case the readings are off, we will be able to make small adjustments, and if it is far off, then a factory calibration will be required.
First test - 5ppm. We want to get a return of close to the intended result as possible.
Second test - 15ppm. Once both results concluded, we will issue a "Calibration Check Certificate" on behalf of the OMD manufacturer DECKMA, to the ship. A copy of the report sent to DECKMA for audit purposes. Total time spent onboard the vessel to perform the service is around 3 hours, sufficient for must port calls.
N&P Maritime has been RWO GmbH's Singapore partner since 2016, supplying genuine RWO spare parts and genuine Deckma OMD parts sourced through RWO. Since October 2025 we are a supply-only company and do not provide onboard service.
N&P Maritime keeps stock of common RWO/Deckma consumable spare parts in Singapore, such as coalescer filters, adsorber polishers, zinc anodes, gauges and desiccators.
We reply to quotation requests within 1 business day and deliver in-stock parts within 3 business days. There is no minimum order requirement.
Contact us at sales@npmarine.sg and/or +65 97684033 if you have any questions.
*RWO GmbH has been supplying future-proof made in Germany solutions for marine water treatment for over 45 years. Their product portfolio includes equipment for the treatment of drinking and process water as well as systems for pollution prevention such as oily water separators or sewage treatment plants. RWO is a technological leader in the field of oil/water-separation with over 16,000 units delivered worldwide. More than 40 global sales and service stations.
FAQ
What is included in an RWO oily water separator health check and 15ppm OMD calibration?
An RWO OWS health check and 15ppm OMD calibration to MEPC 107(49) includes running the separator, checking for error messages and visual condition, confirming sampling water meets 15ppm, verifying spares, performing a 0 ppm fresh-water test, then 5 ppm and 15 ppm tests with genuine DECKMA test liquid, and issuing a Calibration Check Certificate.
Why does RWO include an OWS health check during OMD calibration?
RWO treats the OMD as part of the OWS, so it should always be checked during the visit. Calibrating the monitor while ignoring whether the separator is functioning defeats the purpose of the service visit. The health check confirms no error messages, acceptable visual condition, and sampling water that passes the 15ppm requirement.
What test liquids and readings are used for a 15ppm OMD calibration check?
A fresh-water test should first return 0 ppm, confirming no oil particles. Genuine DECKMA test liquid, available from RWO, is then used for two pre-determined mixture tests: 5 ppm and 15 ppm. Readings should be as close as possible to the intended results. Small adjustments can be made; if readings are far off, factory calibration is required.
What spare parts are checked for an RWO Skit S/DEB 10.0 Next oily water separator?
For an RWO Skit S/DEB 10.0 Next, a health check verifies one set of spare coalescer, one complete set of absorber polisher, and other consumable parts for replacement. N&P Maritime stocks common RWO/Deckma consumables in Singapore, including coalescer filters, adsorber polishers, zinc anodes, gauges and desiccators.
Does N&P Maritime provide onboard OMD calibration or OWS service?
No. Since October 2025 N&P Maritime is a supply-only company and does not provide onboard service. It supplies genuine RWO OWS and sewage parts and Deckma OMD parts sourced through RWO. Quotation requests are answered within 1 business day, and in-stock parts are delivered within 3 business days.