Graviner MK6 Oil Mist Detector (OMD) – Complete Technical Guide, Maintenance, Troubleshooting, Alarm Codes & Marine Engine Protection System
Graviner MK6 Oil Mist Detector (OMD)
Manufacturer
Kidde Fire Protection / Graviner Ltd
Country of Origin
United Kingdom (UK)
Product Type
Oil Mist Detection System (OMD)
Marine Application
Marine Diesel Engine Crankcase Monitoring & Explosion Prevention System
Product Introduction
The Graviner MK6 Oil Mist Detector (OMD) is one of the most widely recognized crankcase protection systems installed on marine diesel engines worldwide. Designed to continuously monitor oil mist concentration within engine crankcases, the MK6 provides early warning of abnormal engine conditions that could lead to serious mechanical failures or crankcase explosions.
Oil mist is often generated when bearings overheat, lubrication becomes inadequate, or internal engine components experience excessive friction. Detecting these conditions at an early stage allows engine personnel to take corrective action before catastrophic damage occurs.
The Graviner MK6 remains a trusted choice among ship owners, chief engineers, technical superintendents, and marine operators due to its proven reliability and worldwide service support.
Original Product Image
The image below shows an actual Graviner MK6 Oil Mist Detection System supplied by SM MARINE SERVICE™, including the control panel, sensor heads, and interface components.
What Is the Graviner MK6 Oil Mist Detector?
The Graviner MK6 is an advanced oil mist detection system designed to continuously sample air from multiple crankcase compartments and measure oil mist concentration.
If abnormal oil mist levels are detected, the system:
- Activates visual alarms
- Activates audible alarms
- Identifies the affected crankcase compartment
- Sends alarm outputs to monitoring systems
- Helps prevent crankcase explosions
The system is widely accepted by major classification societies and installed on thousands of vessels worldwide.
Graviner MK6 System Images
How the Graviner MK6 Works
The Graviner MK6 uses a distributed sensing arrangement.
Each detector head continuously samples crankcase atmosphere and transmits measurement data to the main control panel.
The control panel analyzes oil mist concentration and continuously compares measured values against preset alarm thresholds.
When abnormal conditions occur:
- Oil mist concentration rises.
- Detector heads identify the affected compartment.
- The control panel processes the alarm.
- Visual and audible alarms activate.
- Engineers are alerted immediately.
This process provides critical early warning before dangerous engine conditions develop.
Main Features
Continuous Crankcase Monitoring
Provides 24-hour monitoring of engine conditions.
Multi-Point Detection
Multiple detector heads monitor different engine compartments.
Early Warning Protection
Detects dangerous conditions before severe damage occurs.
Advanced Alarm Management
Provides compartment-specific alarm identification.
Class Approved Design
Accepted by major classification societies worldwide.
Robust Marine Construction
Designed for continuous operation in harsh engine room environments.
Long Service Life
Proven reliability onboard thousands of vessels.
Detector Head Images
Main Components
1. MK6 Control Panel
The central processing unit of the system.
Functions
- Alarm management
- System diagnostics
- Sensor monitoring
- Data processing
2. Detector Heads
Installed on individual crankcase compartments.
Functions
- Oil mist detection
- Local monitoring
- Signal generation
3. Interface / Junction Box
Provides communication between detector heads and control panel.
Functions
- Signal routing
- Power distribution
4. Alarm Outputs
Interfaces with ship alarm systems.
Functions
- Visual alarms
- Audible alarms
- Remote monitoring
5. Sampling Assemblies
Provide accurate crankcase atmosphere monitoring.
Functions
- Air sampling
- Oil mist measurement
Marine Applications
The Graviner MK6 is commonly installed on:
Main Engines
- MAN B&W Engines
- Wärtsilä Engines
- Sulzer Engines
- Mitsubishi Engines
Auxiliary Engines
- Generator Engines
- Auxiliary Diesel Engines
Vessel Types
- Container Ships
- Bulk Carriers
- Oil Tankers
- Chemical Tankers
- LNG Carriers
- Offshore Support Vessels
- Ro-Ro Ships
Engine Room Installation Images
Common Alarm Codes & Indications
Typical Graviner MK6 alarm conditions include:
Oil Mist Alarm
Oil mist concentration exceeds preset limits.
Detector Head Fault
Communication or detector malfunction.
System Fault
Internal control panel fault.
Power Supply Failure
Power interruption detected.
Communication Failure
Loss of communication between detector heads and control panel.
Detector Isolate
A detector has been intentionally isolated from service.
Common Problems & Troubleshooting
High Oil Mist Alarm
Possible Causes
- Bearing overheating
- Lubrication failure
- Excessive friction
- Internal engine damage
Corrective Actions
- Reduce engine load
- Check bearing temperatures
- Inspect lubrication system
- Follow engine manufacturer procedures
Detector Head Fault
Possible Causes
- Sensor contamination
- Wiring fault
- Internal detector failure
Corrective Actions
- Inspect sensor head
- Verify wiring
- Test detector operation
Communication Failure
Possible Causes
- Cable damage
- Loose connections
- Interface module fault
Corrective Actions
- Check communication cables
- Tighten terminals
- Verify interface operation
False Alarms
Possible Causes
- Sensor contamination
- Calibration drift
- Electrical interference
Corrective Actions
- Clean detector heads
- Verify calibration
- Inspect grounding system
Maintenance Tips
Daily Checks
- Verify system healthy status
- Confirm no active alarms
Weekly Checks
- Inspect detector head condition
- Check control panel indicators
Monthly Checks
- Test alarm functions
- Verify communication integrity
Quarterly Maintenance
- Clean detector heads
- Inspect electrical connections
Annual Maintenance
- Full operational testing
- Calibration verification
- Replacement of worn components
Maintenance & Service Images
Available Stock From SM MARINE SERVICE™
SM MARINE SERVICE™ supplies Graviner MK6 Oil Mist Detection Systems in:
- Used Condition
- Refurbished Condition
- Reconditioned Condition
Available items may include:
- MK6 Control Panels
- Detector Heads
- Junction Boxes
- Spare Parts
- Repair & Replacement Units
All available units can be tested before shipment subject to stock availability.
Why Ships Still Use Graviner MK6
The Graviner MK6 continues to be one of the most trusted oil mist detection systems because:
- Proven UK engineering
- High reliability
- Accurate oil mist monitoring
- Fast alarm response
- Long service life
- Easy maintenance
- Worldwide spare parts support
- Excellent safety record
Many vessels continue operating MK6 systems successfully for decades with proper maintenance and periodic servicing.
Frequently Asked Questions (FAQ)
What is the purpose of the Graviner MK6?
The Graviner MK6 continuously monitors oil mist concentration inside marine diesel engine crankcases and provides early warning of dangerous operating conditions.
Why is oil mist detection important?
Oil mist accumulation can lead to crankcase explosions and severe engine damage.
Can the MK6 identify the affected compartment?
Yes. The system identifies which detector head has detected abnormal oil mist levels.
Is the Graviner MK6 class approved?
Yes. It is accepted by major marine classification societies.
Does the system require calibration?
Periodic inspection, testing, and calibration verification are recommended.
Short Product Description
The Graviner MK6 Oil Mist Detector (OMD) is a marine engine protection system designed to continuously monitor oil mist concentration within diesel engine crankcases. Manufactured in the United Kingdom, the MK6 provides early warning of abnormal engine conditions and helps prevent crankcase explosions. Its reliability, accuracy, and worldwide acceptance make it one of the most trusted oil mist detection systems in the marine industry.
Assembly Details
Complete System Assembly Includes
1. MK6 Control Panel
- LCD display
- Alarm management module
- Diagnostic system
2. Detector Heads
- Oil mist sensing chambers
- Measurement electronics
3. Junction / Interface Box
- Signal distribution
- Power management
4. Communication Network
- Detector communication cables
- System interface wiring
5. Alarm Output Module
- Alarm relays
- Monitoring outputs
6. Power Supply System
- Internal power regulation
- Protection circuitry
7. Mounting Hardware
- Brackets
- Fasteners
- Installation accessories
SM MARINE SERVICE™
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment
• Used Equipment
• Refurbished Equipment
• Reconditioned Equipment
Stock Location:
• Bangladesh
• China
Services:
• Worldwide Shipping
• Technical Support
• Spare Parts Supply
• Marine Equipment Sourcing
Contact Information
SM MARINE SERVICE™
Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com