Product Overview
The JOWA ODME 2005 monitors the oil content of water being discharged from an oil tanker. It processes oil concentration, flow rate, vessel speed, total discharged quantity, position, date and time.
When discharge conditions comply with the programmed MARPOL limits, the system permits the overboard valve to open. If any limit is exceeded or required data is unavailable, the system commands the discharge to stop or return to the slop tank.
JOWA states that oil tankers of 150 gross tonnage and above must carry an approved oil-discharge monitoring and control system under the applicable MARPOL requirements. JOWA ODME 2005
Main System Components
1. Computer Unit
Installed in the cargo control room or another safe area.
Functions include:
- Receives and processes system signals
- Calculates instantaneous discharge rate
- Records date, time, position and discharged quantity
- Stores operating data in flash memory
- Controls discharge permission
- Displays alarms and operating status
- Supports record transfer or external printing
2. Zener Barrier Unit
Installed in the engine room or another non-hazardous location.
Functions include:
- Intrinsically safe signal separation
- Electrical power distribution
- Interface between safe and hazardous areas
- Operation of pneumatic or electrical components
- Connection of up to two 4–20 mA flowmeters
3. Analysing Unit
Installed close to the sampling point in the hazardous area.
It contains:
- Oil-content measuring unit
- Sample-feed pump
- Fresh-water cleaning valve
- Sample-flow pressure transmitter
- Terminal unit
- Automatic measuring-cell cleaning arrangement
Main Technical Specifications
| Specification | Details |
|---|---|
| Oil-content range | 0–1,000 ppm |
| Primary measurement | Oil concentration in discharge water |
| Calculated value | Litres of oil per nautical mile |
| Flowmeter inputs | Up to two 4–20 mA loops |
| Vessel-speed input | GPS or approved ship-speed signal |
| Position input | GPS |
| Data recording | Flash-memory storage |
| Cleaning | Automatic fresh-water self-cleaning |
| Analysing-unit location | Hazardous area |
| Computer-unit location | Cargo control room/safe area |
| Discharge control | Automatic overboard valve control |
| Biofuel capability | Approved under MEPC.240(65) |
| Application | Oil tankers of 150 GT and above |
| Measuring-cell design | SmartCell oil-content measuring unit |
Main Features
- Continuous oil-content measurement
- Automatic discharge-rate calculation
- Automatic overboard-valve control
- Starting interlock prevents unauthorized discharge
- Records vessel position, time and quantity
- Self-cleaning measuring arrangement
- Designed for hazardous-area installation
- Suitable for retrofit projects
- No bulkhead penetration required for the sample pump
- Biofuel-blend monitoring approval
- Designed for long service in harsh marine environments
- Large installed base on international tankers
Main Approvals
The current JOWA brochure identifies approvals including:
- DNV
- USCG
- ClassNK
- CCS
- RMRS
- IMO MEPC.108(49)
- IMO MEPC.240(65)
