IMO MEPC.108(49) & 240(65),MEPC.1/Circ.761 Oil Discharge Monitoring Unit
1. General Introduction
The Oil Discharge Monitoring Unit has been designed to provide means of monitoring, recording and controlling the ballast discharge in accordance with the requirements in Resolution MEPC.108(49) as amended by Resolution MEPC.240(65) and is also approved for Bio- fuel blends in accordance with MEPC.1/Circ.761 as revised.
Discharge limits are set at 30 litres per nautical mile and a total discharge expressed as a proportion of the previous cargo for dirty ballast.
The requirements of the MARPOL Convention are that all oil tankers with a gross tonnage of 150 GRT and above must have an oil discharge monitoring and control system installed with an automatic overboard valve control system.
The requirements in Resolution MEPC.108(49) apply to tankers with a date of keel laying or equivalent stage of construction of 1st of January 2005 or later.
2. Technical Data
2.1 Description
| Application |
Crude and Petroleum products according to MEPC.108(49) as amended by Resolution MEPC.240(65).
Bio Fuel blends according to MEPC.1/Circ.761 (The first ODM Bio certificate holder in the world). |
| Range |
0 - 1000 ppm |
| Accuracy |
According to MEPC.108(49). |
| Calibration |
Oil Type 1-9 for Crude and Petroleum products.
5 types for Bio Fuel blends. |
| Sample Flow rate |
Depending on Sample Pump 200 litres/hour to 900 litres/hour. |
| Clean water Flow rate |
Depending on Sample Pump and Water pressure. Intermittently 200 to 600 litres/hour.
Clean water is only used at Discharge Start and stop. Approximately 6-20 litres per Start/Stop. |
2.2 Measuring principle
The measuring principle of the Clean Track 1000B is based on a combination of light scattering in four different angles. The sample water stream is homogenised in the sample feed pump and is passed through a quartz glass tube where it is exposed to a light beam. The light transmitted and scattered in the selected angles is dependent on the type and amount of contaminates in the water stream. Signals from non-oil contaminants can be compensated for due to their different light scattering characteristics.
2.3 System Main Parts
Computer unit:
Voltage 85 - 265VAC
Frequency 50/60 Hz
Consumption 30 VA
Protection IP40
Temperature 5 - 50 °C
Weight 7 kg
Dimensions approx. 370 x 210 x120 mm
Supply voltage should be single phase 110/220VAC,(Computer unit work on voltages 85 - 265VAC).
The power should be equipped with a main switch, or if specified, a detachable connector.
The fuse size should be 6A.
The alarm relay is normally open. An activated alarm is indicated with an open relay, which means that the alarm is activated when the power supply fails.
Converting unit:
With Electric Motor Sample Pump
Voltage 380 /440 VAC ,3P
Frequency 50/60 Hz
Consumption 120 VAC
Protection IP54
Temperature 5 - 50 °C
Weight 14 kg
Dimensions approx. 550 x 360 x 130 mm
The Converting Unit should be mounted in a safe (non-hazardous) area, normally in the engine room, as close as possible to the Analyzing Unit at the other side of the bulkhead. The unit should be provided with enough space to open the cabinet door.
Analyzing unit:
Explosion Proof: Exia II CT4
Sample Pump with Explosion Proof Electric Motor, (Voltage is supplied via converting unit)
Voltage 380 /440 VAC ,3P
Frequency 50/60 Hz
Consumption 0.66 kW
Sample flow 600 l/h (nominal)
Sample Temp. 0 - 65 ºC
Ambient Temp. -20 - + 55 ºC
Weight 35 kg
Dimensions approx. 350 x 410 x 250 mm
The Analyzing Unit should be mounted in the pump room on or close to the bulkhead as close as possible to the Converting Unit at the other side of the bulkhead. The unit should be provided with enough space to open the cabinet door and enough space to facilitate cleaning of the Measuring Cell from above with a brush. There should also be space for operating the valve handles an taking grab samples.
The Drain Valve should be the lowest point of the inlet and outlet piping for efficient draining to avoid freezing damages.
Measuring Cell in ananyzing unit:
Design Pressure 10bar
Protection IP56
Ambient Temp. -25 - +55ºC
Sample Temp. 0 - 65 ºC
The measuring cell is the key component in analyzing unit, which output oil concentration in PPM to computer
unit.
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