Feature 4
level switch activates the emulsion pump additional chemicals, cleaning cycles, or relevant classification societies, coast
and maintains a constant level within the backwashing of systems are required. This guard authorities, and environmental
system. The third stage (fourth vessel) is means that the system is continuously authorities to ensure that the ship has
the Advanced Granular Media Filtration pumping from the bilge tank with no complied with the international oil
(AGMF) system. Here, an upper inlet dilution to the bilge water involved at any discharge regulations (MARPOL). The
feed from the recompression pump onto stage (a key IMO requirement). monitor can also be limited to anything
a distribution mesh allows the emulsified The clarified effluent is then passed down to 0ppm, which can be used for
bilge water to filter through the media. into an oil content monitor device, which compliance in local areas. Using this
The media has been designed to be highly is compliant to IMO MEPC 107(49). If comprehensive process, the VM Series
oleophilic (attracts oils) and hydrophobic the detector reads below 15ppm, then gained <1ppm results in all the water
(repels water) to ensure high efficiencies this effluent is allowed to be discharged samples taken during the official IMO
in oil removal. Also, as an adsorption overboard (except in special areas) and tests.
process, the media chemically binds the if the consent is not met, the effluent Also launched in 2005 was the Victor
oils to its surface. Thus, once trapped, is re-circulated back to the bilge tank. MiniSep CS Series which uses the
the oil will not be released back into The oil content detection monitor technology and principles of the VM
the effluent. The AGMF unit has been records and logs the effluent readings Series but has been optimised for space
engineered to enhance the adsorption for 18 months including all alarms and and cost. Certified under LRS, CCS, and
process and can out-perform granular operating/discharging times. This data USCG, the unit achieved results of less
activated carbon life by over 100%. No can be downloaded at any time by the than 5ppm in all IMO tests. NA
Monitoring optimises fuel usage
Fuel monitoring systems can assist shipowners in meeting environmental
regulations by providing accurate emissions analysis.
F
or ship managers attempting to calculations in the NOx Code to derive
put into place environmental best emissions.
practice policies, analysing ships’ In independent trials onboard ships
emissions can provide one reliable yardstick operated by Höegh Autoliners and
for their success or failure. The approach Metrostar Management Corp last year,
could also prove crucial, should emissions Martek said that monitoring fuel burn had
trading be adopted by the shipping world, as resulted in a 2% fuel saving. For a large
it provides an accurate record of emissions oil tanker, the company pointed out, the
produced, which could then be correlated environmental impact would be equivalent
with any emissions ‘credits’ gained by fleets to a saving in total emissions from 700 cars
or individual vessels. in a year.
Transparent reporting of air emissions A more recent market entrant has been
also assists in compliance to ISO14001 Swedish company Consilium, which has
standards and MARPOL Annex VI Reg 13 launched the Salwico emissions measuring
and Reg 14 (4) (b). Whether or not a ship is system. Salwico verifies a ship’s exhaust
meeting the 1.5% sulphur limit in the new contents after passing through cleaning
sulphur emission control areas could also equipment such as a scrubber or catalytic
be closely monitored using these systems. converter, enabling crew to fine-tune an
Pioneering the fuel monitoring approach engine’s performance.
since 2005 has been Martek, with its The MariNOx system by Martek is said to This system uses chemiluminescence
MariNOx fuel monitoring system. The assist vessels in saving 2% of fuel. to measure NOx and SO content, with
2
continuous monitoring system comprises awareness and alarm criteria able to be
managing software, a cabinet housing a set, should emissions limits be exceeded.
control unit installed in the engineroom, speeds are tracked to generate raw data Salwico also has a full scale interface to
and exhaust gas sample probes. It monitors for class inspection. CO , humidity in the software for reports and data transfer,
2
engines for two 10-minute periods at charger, the cooler, and seawater reference onboard ship or linked to shore, as well as
different IMO-agreed settings. Pressures, temperatures are also monitored, with capacity to interface to other systems such
temperature, humidity, and engine MariNOx software going through the as pollution reporting. NA
The Naval Architect January 2008 85
NA Jan - p83+
85.indd 85 04/01/2008 15:58:21
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