Mastra - Maritime Strategic Association of Malaysia

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Its membership is opened to all individuals with interests, qualifications, expertise and experience in the maritime field, and individuals who are passionate about maritime matters regardless of educational background.

Congratulations to MASTRA member Pierre Lim and his team from Automind/Unity for organizing the very successful inaugura...
08/06/2026

Congratulations to MASTRA member Pierre Lim and his team from Automind/Unity for organizing the very successful inaugural Regional Marine Technology & Robotics Forum at the Pinetree Marina Resort, Puteri Harbour, Johor Bahru on 20 May 2026. Highly informative sessions on robotics and unmanned vessel technology. Speakers, panelists and attendees came from throughout the ASEAN region and China.

CARGO TANK GAS FREE The cargo tank degassing process is carried out to remove flammable, toxic, or inert gases from a ta...
08/06/2026

CARGO TANK GAS FREE

The cargo tank degassing process is carried out to remove flammable, toxic, or inert gases from a tank and replace them with fresh air so that the tank becomes safe for inspection, maintenance, repairs, or hot work.

Typical Cargo Tank Degassing Procedure

1. Cargo Discharge Completion
× Ensure all cargo has been discharged.
× Strip cargo lines and pumps.
× Drain remaining residues to slop tanks where applicable.

2. Tank Washing
- Wash cargo tanks using fixed or portable tank cleaning machines.
- Remove cargo residues from tank surfaces.
- Collect wash water in slop tanks.

3. Purging (If Tank Is Inerted)
> Replace inert gas with fresh air, or in some cases use an intermediate gas depending on cargo type.
> Reduce hydrocarbon concentration gradually.

4. Ventilation / Degassing
* Open designated tank openings and vents.
* Use fixed or portable fans/blowers.
* Introduce fresh air and exhaust contaminated atmosphere through venting systems.
* Continue until hydrocarbon levels are below required limits.

5. Atmosphere Testing
Test at:
● Tank top
● Mid-depth
● Tank bottom
● Pump room (if applicable)

Typical acceptance criteria:
Oxygen: approximately 20.9%
● Hydrocarbon concentration: below 1% LFL (or as company procedures require)
● Toxic gases (H₂S, benzene, etc.) below occupational exposure limits.

6. Gas-Free Certification
☆ Authorized officer or marine chemist conducts final testing.
☆ Issue Gas-Free Certificate if required.

7. Entry Permit
Before personnel entry:
■ Complete enclosed-space entry permit.
■ Establish continuous ventilation.
■ Prepare rescue equipment and standby personnel.

Example Sequence for a Crude Oil Tanker
》Discharge crude oil.
》Crude Oil Washing (COW).
》Water wash.
》Strip residues.
》Ventilate tanks using portable fans.
》Measure O₂ and hydrocarbon levels.
》Gas-free certification.
》Tank inspection or repair.

Safety Precautions
◇ No smoking or ignition sources.
◇ Use intrinsically safe equipment.
◇ Monitor atmosphere continuously.
◇ Follow enclosed-space entry procedures.
◇ Maintain communication with personnel inside tanks.

For oil tankers, chemical tankers, and LNG/LPG carriers, the detailed degassing procedure differs because of the cargo characteristics and regulatory requirements.

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PERSONAL TRANFER BASKET IN MARINE In the marine and offshore industry, a Personnel Transfer Basket (sometimes called a m...
28/05/2026

PERSONAL TRANFER BASKET IN MARINE

In the marine and offshore industry, a Personnel Transfer Basket (sometimes called a man basket or personnel basket) is a specially designed device used to safely transfer personnel between:
- vessels,
- offshore platforms,
- FPSOs,
- rigs,
- jetties, or
- offshore wind structures,
usually by crane lifting operations.

Common Types of Marine Personnel Transfer Baskets

1. Billy Pugh Basket
The most common offshore transfer basket.
Features:
> Circular design
> Shock-absorbing inner ring
> Multiple standing positions
> Used for quick personnel transfer

2. FROG Personnel Transfer Device
A capsule-style transfer system offering more protection from:
》waves,
》impact,
》wind,
》falling risks.
Often used in harsh weather environments.

3. Rigid Personnel Basket
A metal-framed rigid basket with:
◇ fixed floor,
◇ guard rails,
◇ attachment points for harnesses.
◇ Used for maintenance and industrial lifting.

4. Swing Rope Transfer Basket
● Older transfer method using rope-supported standing platforms.
● Less common today due to safety improvements and stricter regulations.

Main Safety Features
Marine personnel transfer baskets normally include:
☆ Shock absorption system
☆ Anti-slip flooring
☆ High-visibility colors
☆ Certified lifting points
☆ Emergency flotation
☆ Fall protection harness points

Relevant Standards & Guidelines
Common offshore references include:
× International Maritime Organization guidelines
× American Petroleum Institute RP 2D
× Occupational Safety and Health
× Administration lifting safety rules
× DNV offshore lifting certifications

Typical Offshore Uses
¤ Crew change operations
¤ Emergency evacuation
¤ Maintenance crew transfer
¤ Ship-to-platform personnel movement
¤ Offshore wind farm access

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

LIFEBOAT Lifeboats are specially designed boats used for emergency evacuation, mainly from ships. They come in several t...
25/05/2026

LIFEBOAT

Lifeboats are specially designed boats used for emergency evacuation, mainly from ships. They come in several types depending on their design, launching method, and purpose. Here are the main types:

1. Open Lifeboats
● These are the oldest and simplest type.
● No roof or enclosure
● Exposed to weather (rain, wind, waves)
● Lightweight and easy to launch
● Mostly outdated now but still used in some small vessels

2. Partially Enclosed Lifeboats
☆ Covered top but open sides or entrances
☆ Offers some protection from weather
☆ Common on older cargo ships
☆ Easier access than fully enclosed boats

3. Fully Enclosed Lifeboats
》Completely covered (capsule-like design)
》Protects passengers from fire, waves, and harsh weather
》Self-righting (can flip back upright if
overturned)
》Most common type on modern ships

4. Free-Fall Lifeboats
> Mounted at the stern (back of ship)
> Drop directly into the sea from height
> Designed for quick evacuation in emergencies
> Strong, enclosed, and impact-resistant

5. Inflatable Liferafts
× Compact and stored in containers
× Automatically inflate when deployed
× Lightweight and widely used
× Common on both ships and aircraft

6. Rescue Boats (Fast Rescue Boats)
□ Smaller, high-speed boats
□ Used for rescuing people from water
□ Equipped with engines and navigation tools
□ Often accompany larger lifeboats

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

MARINE PROPULSION Part 1 Common ship propulsion systems can be grouped by how they generate and transfer power to move t...
19/05/2026

MARINE PROPULSION

Part 1

Common ship propulsion systems can be grouped by how they generate and transfer power to move the vessel through water.

1. Diesel Mechanical Propulsion
The most common system for commercial ships.

How it works?
A diesel engine directly drives the propeller through a gearbox and shaft.

Common in
● Cargo ships
● Fishing vessels
● Tugboats
● Small tankers

Advantages
● Reliable
● Fuel efficient
● Easier maintenance
● Proven technology

Disadvantages
● Vibration and noise
● Less flexible in power distribution

2. Diesel-Electric Propulsion
Diesel engines generate electricity, and electric motors turn the propeller.

Common in
- Cruise ships
- Offshore vessels
- Research ships
- Icebreakers

Advantages
- Flexible machinery arrangement
- Better maneuverability
- Lower vibration
- Good for dynamic positioning (DP)

Disadvantages
- Higher capital cost
- More complex electrical systems

3. Gas Turbine Propulsion
Uses gas turbines similar to aircraft engines.

Common in
° Naval ships
° High-speed ferries

Advantages
° High power-to-weight ratio
° Fast acceleration
° Compact size

Disadvantages
° High fuel consumption
° Expensive maintenance

4. Steam Turbine Propulsion
Steam drives turbines connected to propeller shafts.

Common in
× Older LNG carriers
× Historical naval vessels

Advantages
× Smooth operation
× Can use boil-off gas in LNG ships

Disadvantages
× Lower efficiency compared to modern diesel systems
× Large machinery footprint

5. Nuclear Propulsion
Heat from nuclear reactors produces steam for turbines.

Common in
> Aircraft carriers
> Submarines
> Icebreakers

Advantages
> Extremely long endurance
> Very high power output

Disadvantages
> Very high cost
> Strict safety regulations
> Complex operation

6. LNG / Dual-Fuel Propulsion
Engines can run on LNG and conventional marine fuel.

Common in
◇ LNG carriers
◇ Modern container ships
◇ Green shipping projects

Advantages
◇Lower emissions
◇IMO compliance supportReduced sulfur and NOx emissions

Disadvantages
◇ Expensive fuel storage systems
◇ Cryogenic handling requirements

7. Hybrid Propulsion
Combines multiple power sources such as diesel engines, batteries, fuel cells, or solar.

Common in
》Ferries
》Offshore support vessels
》Green vessels

Advantages
》Fuel savings
》Lower emissions
》Silent operation in battery mode

Disadvantages
》Complex integration
》Battery weight and cost

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

MARINE STRUCTURE STRESS SIGNSCommon signs of stress in marine structures can indicate fatigue, overload, corrosion, poor...
18/05/2026

MARINE STRUCTURE STRESS SIGNS

Common signs of stress in marine structures can indicate fatigue, overload, corrosion, poor maintenance, or structural failure risks. These signs are critical in ships, offshore platforms, FPSOs, jetties, and marine pipelines.

Visual Signs of Structural Stress

1. Cracks

● Hairline or visible cracks on hull plates, weld seams, decks, or bulkheads
● Common near stress concentration areas and welded joints

2.Buckling or Deformation
● Bent plates, warped decks, or distorted frames
● Often caused by excessive loading, slamming, grounding, or collision

3.Corrosion
● Rusting, pitting, thinning steel, or coating failure
● Severe corrosion reduces structural strength

4.Fractures in Welds
● Weld separation or tearing
● Indicates fatigue or poor welding quality

5.Permanent Deflection
● Sagging beams, uneven deck surfaces, or hull hogging/sagging
● Shows the structure exceeded elastic limits

6.Leakage
● Water ingress through cracks, seals, or damaged plating
● Common in ballast tanks, cargo tanks, and hull penetrations

7.Vibration and Noise
● Unusual vibration from machinery foundations or hull structures
● Can indicate resonance, loosened supports, or fatigue

8.Coating Peeling
● Paint blistering or delamination
● Often early indication of corrosion underneath

9.Loose Fasteners or Connections
● Bolts, rivets, or brackets becoming loose
● May occur due to cyclic loading and vibration

10.Fatigue Damage
● Repeated cyclic stress causing microcracks
● Common in high-wave operational areas

Operational Indicators
◇ Increased fuel consumption due to hull deformation
◇ Misalignment of shafts or piping
◇ Difficulty opening watertight doors or hatches
◇ Excessive structural vibration during rough seas

High-Risk Areas in Marine Structures
× Midship section
× Hatch corners
× Engine room foundations
× Cargo tank boundaries
× Offshore platform joints
× Crane support structures
× Bilge and ballast tank regions

Monitoring Methods
☆ Ultrasonic thickness testing (UT)
☆ Non-destructive testing (NDT)
☆ Structural health monitoring sensors
☆ Strain gauges
☆ Drone and ROV inspections
☆ Finite Element Analysis (FEA)

Main Causes
》Wave-induced loading
》Corrosion and erosion
》Overloading
》Fatigue from cyclic stresses
》Poor maintenance
》Thermal stress
》Grounding or collision damage

In modern marine engineering, predictive maintenance and digital structural monitoring are increasingly used to detect stress signs before catastrophic failure occurs.

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

PETROLEUM CARGO TANKA petroleum cargo tank is a specialized tank on an oil tanker used to store and transport liquid pet...
16/05/2026

PETROLEUM CARGO TANK

A petroleum cargo tank is a specialized tank on an oil tanker used to store and transport liquid petroleum products safely during marine transportation.

Main Functions
× Store crude oil or refined petroleum products
× Maintain cargo stability during voyage
× Prevent leakage, contamination, and explosion risks
× Support safe loading and unloading operations

Types of Petroleum Cargo Tanks

1. Integral Tanks
● These tanks are part of the ship’s hull structure itself.
● Most common in oil tankers
● Strong and space-efficient
● Used for crude oil and fuel transport

2. Independent Tanks
● Separate tanks installed inside the vessel.
● Easier maintenance
● Often used in specialized tankers

3. Slop Tanks
Used for:
● Oil residues
● Tank washing waste
● Dirty ballast water

4. Segregated Ballast Tanks (SBT)
● Dedicated tanks for ballast water only.
● Prevent oil pollution
● Required by international regulations

Petroleum Cargo Tank Arrangement
Typical tanker cargo area includes:
》Center tanks
》Wing tanks (port and starboard)
》Pump room
》Cargo pipelines
》Venting systems
》Inert gas system

Important Systems Connected to Cargo Tanks

Inert Gas System (IGS)
■ Fills empty tank space with inert gas
■ Reduces oxygen level
■ Prevents fire and explosion

Cargo Pumping System
■ Loads and discharges petroleum cargo
■ Includes stripping pumps and main cargo pumps

Tank Venting System
■ Controls pressure inside tanks
■ Releases gases safely

Tank Gauging System
Measures:
■ Cargo level
■ Temperature
■ Pressure

Safety Concerns
Petroleum cargo tanks are considered hazardous areas because petroleum vapors are flammable.

Key risks:
> Explosion
> Static electricity
> Toxic gas exposure
> Corrosion
> Structural stress

Common Petroleum Products Carried
☆ Crude oil
☆ Diesel
☆ Gasoline
☆ Jet fuel
☆ Naphtha
☆ Fuel oil

Materials Used
Cargo tanks are commonly built from:
◇ Marine-grade steel
◇ Coated steel for corrosion resistance
◇ Specialized coatings depending on cargo type

International Regulations
Petroleum cargo tanks must comply with:
¤ International Maritime Organization regulations
¤ MARPOL pollution prevention rules
¤ SOLAS safety requirements

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

MARINE BIOFOULING Biofouling on a ship’s hull refers to the accumulation of marine organisms and biological materials on...
15/05/2026

MARINE BIOFOULING

Biofouling on a ship’s hull refers to the accumulation of marine organisms and biological materials on submerged surfaces. It increases drag, fuel consumption, corrosion risk, and maintenance costs.

Main Types of Biofouling on Ship Hulls

1. Microfouling (Slime Layer)
This is the earliest stage of fouling.

Characteristics:
● Thin biofilm or slime

Formed by:
● Bacteria
● Diatoms
● Algae
● Microorganisms

Effects:
● Increases surface roughness
● Raises fuel consumption by reducing hydrodynamic efficiency
● Promotes further fouling attachment

2. Macrofouling
■ Larger marine organisms attach permanently to the hull.

A. Soft Macrofouling
■ Includes soft-bodied organisms.

Examples:
■ Seaweed
■ Algae
■ Hydroids
■ Tunicates

Common Areas:
■ Waterline
■ Sea chests
■ Propellers

B. Hard Macrofouling
》Hard-shelled organisms strongly adhere to surfaces.

Examples:
》Barnacles
》Mussels
》Oysters
》Tube worms

Effects:
》Major drag increase
》Can damage coatings
》Accelerates corrosion and cavitation

Common Fouling-Prone Areas on Ships
☆ Hull bottom
☆ Sea chests
☆ Rudders
☆ Propellers
☆ Thruster tunnels
☆ Intake gratings
☆ Ballast tank openings

Impacts of Biofouling

Operational Effects
◇ Higher fuel consumption
◇ Reduced speed
◇ Increased engine load
◇ Reduced maneuverability

Structural Effects
◇ Corrosion under deposits
◇ Coating deterioration
◇ Increased dry docking frequency

Environmental Effects
◇ Transfer of invasive aquatic species between ports and countries

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

HULL INSPECTIONHull inspection is the process of examining a ship’s hull structure to ensure its safety, strength, water...
12/05/2026

HULL INSPECTION

Hull inspection is the process of examining a ship’s hull structure to ensure its safety, strength, watertight integrity, and compliance with maritime regulations. It is one of the most critical activities in marine maintenance and classification surveys.

Main Objectives of Hull Inspection
》Detect corrosion, cracks, deformation, or structural damage
》Check hull thickness and steel wastage
》Identify leaks or coating failures
》Ensure seaworthiness and safety
》Maintain compliance with classification societies and maritime authorities

Areas Commonly Inspected
A) External Hull
● Bottom plating
● Side shell plating
● Bilge area
● Bulbous bow
● Stern section
● Propeller and rudder area

B) Internal Hull Structure
● Frames and stiffeners
● Bulkheads
● Double bottom tanks
● Ballast tanks
● Cargo holds
● Engine room structure

Types of Hull Inspection

1. Visual Inspection
Basic inspection using:
> Flashlights
> Cameras
> Drones
> Remote operated vehicles (ROVs)
Used to identify:
> Rust
> Cracks
> Paint failure
> Structural deformation

2. Ultrasonic Thickness Measurement (UTM)
Measures steel thickness to determine corrosion or metal loss.
Common in:
> Tankers
> Bulk carriers
> Offshore vessels

3. Non-Destructive Testing (NDT)
Methods include:
> Ultrasonic Testing (UT)
> Magnetic Particle Testing (MT)
> Dye Penetrant Testing (PT)
> Radiographic Testing (RT)
Used to detect hidden cracks and weld defects.

4. Underwater Hull Inspection
Conducted by:
> Divers
> ROV systems
Checks:
> Marine growth
> Hull damage
> Propeller condition
> Sea chest blockage

Signs of Hull Problems
> Excessive corrosion
> Buckling or dented plates
> Cracks near welds
> Water ingress
> Coating blistering
> Unusual vibration or noise

Hull Inspection Schedule
Usually conducted:
> Before dry docking
> During annual surveys
> Special surveys every 5 years
> After grounding or collision
> Before vessel purchase

Equipment Used
> Ultrasonic thickness gauge
> ROVs and underwater drones
> Borescope cameras
> Crack detection kits
> Laser measurement tools

Classification and Standards
Inspections are often supervised by organizations such as:
> Lloyd's Register
> DNV
> American Bureau of Shipping
> Bureau Veritas

Modern Trends

Smart Hull Inspection
Using:
◇ AI image analysis
◇ Drones
◇ Digital twins
◇ Predictive maintenance systems
This reduces:
◇ Inspection time
◇ Human risk
◇ Operational downtime

In-water Robotic Inspection
Growing rapidly for:
◇ Offshore platforms
◇ Naval ships
◇ Deep-sea vessels

Visit and follow us for more info
www.mastra.org.my
www.octrexholdings.com

Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

SHIP STABILITYShip stability is the ability of a vessel to return to an upright position after being tilted by external ...
11/05/2026

SHIP STABILITY

Ship stability is the ability of a vessel to return to an upright position after being tilted by external forces like waves, wind, or loading shifts. It’s one of the most critical aspects of naval architecture because it directly affects safety, operability, and survivability at sea.

1. Types of Ship Stability
1. Initial Stability
》Refers to stability at small angles of heel (typically 0 → Stable
● GM = 0 → Neutral
● GM < 0 → Unstable (risk of capsizing)

3. Types of Stability Conditions
■ Stable equilibrium: Ship returns upright after tilt
■ Neutral equilibrium: Ship stays at angle
■ Unstable equilibrium: Ship continues to tilt

4. Factors Affecting Stability

1. Loading Condition
> Improper cargo distribution raises G.
> Top-heavy ships are dangerous.

2. Free Surface Effect
> Liquids in partially filled tanks shift during motion.
> Reduces GM significantly.

3. Hull Design
> Wider beam → better initial stability.
> Deep draft improves overall stability.

4. External Forces
> Wind, waves, currents.
> Turning forces (centrifugal force in maneuvers).

5. Stability Measurements & Tools
× Righting arm (GZ curve): Shows the ship’s ability to return upright at different angles.
× Inclining experiment: Determines actual center of gravity.
× Stability booklet: Mandatory onboard reference for safe loading.

6. Why It Matters
Poor stability can lead to:
- Cargo shifting
- Structural stress
- Capsizing (e.g., MV Sewol incident linked to overloading and poor stability)

7. Practical Example
A container ship with heavy cargo stacked too high → raises G → reduces GM → increases risk of capsizing in rough seas.

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Mastra - Maritime Strategic Association of Malaysia
Octrex Holdings

Address

22-2, Jalan Puteri 3A/6, Bandar Puteri Bangi, Sungai Way
New Village
43000

Telephone

+60126804047

Website

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