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

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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.

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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

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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:

1. Oil mist concentration rises.
2. Detector heads identify the affected compartment.
3. The control panel processes the alarm.
4. Visual and audible alarms activate.
5. Engineers are alerted immediately.

This process provides critical early warning before dangerous engine conditions develop.

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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

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Main Components

1. MK6 Control Panel

The central processing unit of the system.

Functions

• Alarm management
• System diagnostics
• Sensor monitoring
• Data processing

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2. Detector Heads

Installed on individual crankcase compartments.

Functions

• Oil mist detection
• Local monitoring
• Signal generation

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3. Interface / Junction Box

Provides communication between detector heads and control panel.

Functions

• Signal routing
• Power distribution

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4. Alarm Outputs

Interfaces with ship alarm systems.

Functions

• Visual alarms
• Audible alarms
• Remote monitoring

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5. Sampling Assemblies

Provide accurate crankcase atmosphere monitoring.

Functions

• Air sampling
• Oil mist measurement

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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

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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.

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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

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Detector Head Fault

Possible Causes

• Sensor contamination
• Wiring fault
• Internal detector failure

Corrective Actions

• Inspect sensor head
• Verify wiring
• Test detector operation

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Communication Failure

Possible Causes

• Cable damage
• Loose connections
• Interface module fault

Corrective Actions

• Check communication cables
• Tighten terminals
• Verify interface operation

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False Alarms

Possible Causes

• Sensor contamination
• Calibration drift
• Electrical interference

Corrective Actions

• Clean detector heads
• Verify calibration
• Inspect grounding system

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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

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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.

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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.

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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.

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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.

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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

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