Oil Discharge Monitoring and Control System | ODMCS | Oil tanker | Merchant Navy Knowledge
Summary
TLDRThe Oil Discharge Monitoring and Control System (ODMCs) is a crucial maritime technology designed to ensure compliance with environmental regulations. It consists of components in hazardous and non-hazardous areas, including an analyzing unit, sample feed pump, converting unit, and a computer unit in the cargo control room. The system measures oil concentration in discharged water using a light beam and photodiodes, converting the optical data into electrical signals for processing. If oil discharge exceeds regulatory limits, the system triggers alarms and automatically adjusts valves to prevent overboard discharge. It also records and prints data such as oil discharge rate, content in ppm, total quantity discharged, and ship's speed, ensuring transparency and compliance.
Takeaways
- đ The Oil Discharge Monitoring and Control System (ODMCs) is designed to ensure compliance with regulations regarding the discharge of oil from ships.
- đ ODMCs components are strategically placed in both hazardous and non-hazardous areas for safety and operational efficiency.
- đ ïž The analyzing unit, which includes a sample water measuring unit and various connections for sample water and cleaning, is installed in the pump room.
- đ A sample feed pump is mounted in the engine room bulkhead to facilitate the flow of sample water to the analyzing unit.
- đ The electrical drive motor for the sample feed pump is also located in the engine room for easy access and maintenance.
- đ The converting unit, which includes Zener barriers and a container for cleaning liquid, is installed in the engine room for signal conversion and sample cleaning.
- đ» The system's computer unit, responsible for processing and controlling the system, is installed in the cargo control room for centralized management.
- đ« The system is initially operated with the overboard valve closed and the slop tank return valve opened to stabilize before operation.
- đ The ODMCs uses infrared light scattering to measure oil concentration in the water, which is then detected by photodiodes and converted into an electrical signal.
- â ïž The computer unit activates alarms and closes the discharge valve when oil discharge rates exceed regulatory limits, ensuring environmental protection.
- đ In case of ODMCs failure, the computer automatically closes the overboard valve and opens the return valve to the slop tanks, activating alarms as a safety measure.
- đ The computer uses data from the flow meter, oil concentration (ppm), and ship's speed to calculate the oil discharge rate and total quantity discharged.
- đšïž Regular automatic printing of key data, including oil discharge rate, oil content, total quantity discharged, time, date, and ship speed, ensures documentation for regulatory compliance.
Q & A
What are the two main areas where the components of the Oil Discharge Monitoring and Control System (ODMCS) are located?
-The components of the ODMCS are located in two main areas: hazardous and non-hazardous areas.
Where is the analyzing unit of the ODMCS typically installed?
-The analyzing unit of the ODMCS is typically installed in the pump room.
What is the purpose of the sample feed pump, and where is it mounted in relation to the ship's structure?
-The sample feed pump is responsible for taking a sample of the water being discharged and is mounted in the engine room bulkhead.
What is the role of the converting unit in the ODMCS, and where is it installed?
-The converting unit processes the optical information into electrical signals and is installed in the engine room.
How is the fresh water supply provided to the analyzing unit for automatic flushing of the measuring cell?
-A fresh water supply is provided either from the ship's fresh water service piping system or a small freshwater header tank, supplied by a check valve to the analyzing unit.
What does the converting unit consist of, and what are its main functions?
-The converting unit consists of two sections: one with Zener barriers for intrinsically safe signals and various electrical components, and the other with a container for cleaning liquid and a pump for feeding it to the measuring cell at controlled intervals.
What signals are used by the computer unit to calculate the oil discharge rate in liters per nautical mile?
-The computer unit uses the processed ppm (parts per million) information, discharge flow rate, and the ship's speed to calculate the oil discharge rate in liters per nautical mile.
What actions does the computer take when the oil discharge rate exceeds the permissible value?
-When the oil discharge rate exceeds the permissible value, the computer activates audible and visible alarms, closes the discharge valve, and opens the slop tank return valve.
How does the ODMCS ensure that the overboard valve is closed and the slop tank return valve is opened during initial operation?
-The ODMCS uses an interlock mechanism to ensure that the overboard valve is closed and the slop tank return valve is opened during initial operation, allowing the system to stabilize.
What information is printed out by the computer printer at regular intervals, and how often is this done?
-The computer printer automatically prints out information such as the discharge rate of oil in liters per nautical mile, oil content in ppm, total quantity of oil discharged, time and date, ship speed, effluent flow rate, position of the discharge valve, oil type, alarms or warnings, and any failure at regular intervals, for example, every 10 minutes.
What is the purpose of the light beam infrared light path in the measuring cell of the analyzer unit?
-The light beam infrared light path in the measuring cell is used to detect oil particles in the water sample. Oil particles scatter the light, and the amount of light scattered is proportional to the oil concentration.
Outlines
đłïž Oil Discharge Monitoring and Control System (ODMCs) Overview
The Oil Discharge Monitoring and Control System (ODMCs) is designed to monitor and control oil discharge from ships to ensure compliance with environmental regulations. The system is divided into hazardous and non-hazardous areas, with components such as the analyzing unit in the pump room, sample feed pump in the engine room bulkhead, and electrical drive motor in the engine room. The converting unit and computer unit are also strategically placed for optimal operation. The analyzing unit measures oil concentration in water samples using a light beam and infrared technology, with the results processed by the computer unit. The system is initialized with the overboard valve closed and the slop tank return valve open, and it stabilizes before taking water samples. The ODMCs calculates oil concentration in parts per million (ppm) and triggers alarms if discharge rates exceed regulatory limits, automatically closing the discharge valve and opening the slop tank return valve. In case of system failure, similar actions are taken to prevent unauthorized discharge.
đ ODMCs Data Recording and Reporting
The ODMCs is equipped with a computer that records and prints out essential data at regular intervals, such as every 10 minutes. This data includes the discharge rate of oil in liters per nautical mile, oil content in ppm, total quantity of oil discharged, time and date, ship speed, effluent flow rate, position of the discharge valve, oil type, and any alarms or warnings. It also logs override actions, manual overrides, flushing, and calibration activities. The system uses pressure differential signals from a flow meter to calculate the overboard flow rate, which, along with the ppm data and ship's speed, helps determine the oil discharge rate and total quantity discharged overboard.
Mindmap
Keywords
đĄOil Discharge Monitoring and Control System (ODMCS)
đĄAnalyzing Unit
đĄSample Feed Pump
đĄElectrical Drive Motor
đĄConverting Unit
đĄComputer Unit
đĄPneumatic Solenoid Valve
đĄIntrinsically Safe Power Supply
đĄOverboard Valve
đĄSlop Tank Return Valve
đĄAlarm System
Highlights
The ODMCs system is designed for oil discharge monitoring and control, ensuring compliance with environmental regulations.
System components are strategically located in both hazardous and non-hazardous areas for safety and efficiency.
An analyzing unit in the pump room is responsible for the initial detection of oil particles in water.
A sample feed pump in the engine room bulkhead facilitates the transfer of water samples for analysis.
The electrical drive motor is situated in the engine room for easy access and maintenance.
The converting unit in the engine room processes signals from the analyzing unit.
The system's computer unit is centralized in the cargo control room for monitoring and control.
The analyzing unit includes a sample water measuring unit and various connections for sample intake and cleaning.
A fresh water supply system is in place for automatic flushing of the measuring cell.
The converting unit features Zener barriers for safe signal transmission and a flow meter for monitoring.
A cleaning liquid system is integrated for regular maintenance of the measuring cell.
Pneumatic signals are routed through approved bulkhead penetrations for safety.
The computer unit receives input from the ship's speed log and controls the valve system based on oil concentration.
Infrared light scattering is used to measure oil concentration in the water samples.
Photodiodes detect oil concentration by measuring the amount of scattered light.
The computer processes optical information into electrical signals for further analysis.
An alarm system is activated if oil discharge exceeds regulatory limits, ensuring immediate response.
In the event of system failure, the computer automatically redirects oil to slop tanks and alerts the crew.
The computer uses pressure differential signals to represent the overboard flow rate.
Data such as discharge flow rate, ship's speed, and oil content are used to calculate the oil discharge rate.
Regular automatic printing of relevant data ensures compliance with regulatory requirements.
Manual override, flushing, and calibration options are available for system maintenance.
Transcripts
oil discharge monitoring and control
system
odmcs components are located in two
areas hazardous and non-hazardous areas
an analyzing unit is installed in the
pump room
a sample feed pump is mounted in the
engine room bulkhead and the electrical
drive motor is located in the engine
room
the converting unit is also installed in
the engine room
the system's computer unit is installed
in the cargo control room
the analyzing unit contains the sample
water measuring unit
measuring cell connections for inlet and
outlet of sample water a pneumatic line
inlet for operations of the pneumatic
valve for sample water piping for
cleaning liquid flushing water and few
cable inlets for the intrinsically safe
power supply and measuring signals
a fresh water supply either from the
ship's fresh water service piping system
or a small freshwater header tank is
supplied by a check valve to the
analyzing unit for the automatic
flushing of the measuring cell during
each starting and stopping of the cycle
the converting unit consists of two
sections
one is zener barriers for the
intrinsically safe measuring signals and
the flow meter signals
sample feed pump relays and circuit
breakers power transformers and various
cable terminals
the other section is a container with
cleaning liquid and the associated pump
for feeding cleaning liquid to the
measuring cell at controlled intervals
and a pneumatic solenoid valve to
control sample flow through the
measuring cell
small diameter tubing for pneumatic
signals is routed between the converting
unit and the analyzing unit via approved
bulkhead penetrations
the converting unit has input
connections for electrical power
compressed air and output connections
for measuring signals
further it has the necessary signal
cable connection to the computer unit
the computer has a single phase power
input
command and communication signal
connections to the converting unit and
input connections for a signal from the
ship's speed log
it provides output signals to operate
pneumatic solenoid valves in the ship
valve control system for opening the
overboard valve and closing of the
return valve to slop tanks when
acceptable overboard discharging
conditions are sensed and vice versa
it also has a display of relevant
current data and a printer for recording
all of data required by the regulations
initially the odmcs is put to operation
in a condition where the overboard valve
is closed and the slop tank return valve
is opened by interlock mechanism of
odmcs and allowing system to stabilize
sample of the water being discharged by
the cargo or slop tank pump is taken by
the odmcs sample feed pump and it is
sent through the measuring cell of
analyzer unit where it is subjected to a
light beam infrared light path in a
quartz tube
oil particles emulsified in water
scatter the light and the amount of
light scattered is proportional to the
number of oil particles and thus to the
oil concentration expressed in parts per
million or ppm
the oil concentration is detected by
measuring the scattered light with
photodiodes
the optical information thus obtained
from the measuring cell is transformed
into electrical signal by amplifying
circuitry in the converting unit and is
further fed to the computer control unit
for processing
when the calculated rate of discharge of
oil 30 liters per nautical mile or
maximum oil content 15 ppm or the total
quantity of oily water discharge reaches
beyond the permissible discharge value
as per regulations the computer
activates the audible and visible alarm
thereby closing the discharge valve
immediately and opening the slop tank
return valve
then the cargo or slop pump should be
stopped
and in the event of odmcs failure the
computer closes the overboard valve and
opens the return valve to the slop tanks
thereby activating visual and audible
alarms
the pressure differential signals from
the flow meter is used in the computer
to represent the overboard flow rate
the ppm information processed in the
computer along with other information
like discharge flow rate and ship's
speed are used to calculate oil
discharge rate in liters per nautical
mile and total quantity discharged
overboard
the computer printer automatically
prints out at regular intervals of say
10 minutes the following information
discharge rate of oil in liters per
nautical mile
oil content in ppm
total quantity of oil discharged in
cubic meters or liters
time and date
ship speed in knott's effluent flow rate
position of the discharge valve oil type
alarms or warnings
failure in other words no flow
fault and so on
override action in other words manual
override flushing calibration and so on
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