MARPOL Annex I–VI
Nov 27, 2025



MARPOL, the International Convention for the Prevention of Pollution from Ships, sets global standards to minimize marine pollution from shipping. The convention is divided into six annexes, each addressing specific types of pollutants:

Annex I – Oil Pollution: Regulates the discharge of oil and oily mixtures from ships, including operational and accidental oil spills. It mandates oil discharge monitoring and containment measures.

Annex II – Noxious Liquid Substances: Covers the control of pollution by harmful liquid substances carried in bulk, requiring proper documentation, handling, and discharge restrictions.

Annex III – Harmful Substances in Packaged Form: Focuses on preventing marine pollution by packaged hazardous materials, including labeling, documentation, and stowage standards.

Annex IV – Sewage: Sets requirements for the treatment and discharge of sewage from ships, aiming to protect coastal and open waters from contamination.

Annex V – Garbage: Regulates the disposal of ship-generated waste, prohibiting dumping of plastics and controlling the discharge of other refuse to safeguard the marine environment.

Annex VI – Air Pollution: Limits emissions from ships, including sulfur oxides (SOx), nitrogen oxides (NOx), and ozone-depleting substances, promoting cleaner shipping fuels and engine technologies.

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Fouling

Fouling in the Engine Room Fouling inside heat exchangers, piping and machinery is a persistent threat to vessel reliability, fuel efficiency and safety. Left unchecked, deposits and films build up on internal surfaces, reducing heat transfer, increasing pump and compressor loads, and accelerating corrosion. Below we explain the six common types of engine-room fouling, their root causes, operational impacts, and practical prevention measures every chief engineer and technical manager should know. Types of fouling 1. Scaling Mineral salts precipitate from hard water (e.g., calcium or magnesium salts) and form hard, insulating layers on heat-transfer surfaces. Scaling reduces thermal efficiency and flow, increasing fuel consumption and risking overheating of machinery. 2. Particulate fouling Suspended solids sand, rust particles, paint flakes or sediment settle and accumulate in piping and exchangers. These deposits obstruct flow paths and erode components, leading to frequent filter replacements, higher head loss and reduced system performance.

SECURITY LEVELS: ISPS CODE

The International Ship and Port Facility Security (ISPS) Code is a comprehensive set of measures adopted by the International Maritime Organization (IMO) under the Safety of Life at Sea (SOLAS) Convention. Established in response to heightened concerns about maritime terrorism and unlawful acts after the September 11, 2001 attacks, the ISPS Code entered into force on July 1, 2004. Its primary objective is to enhance the security of ships and port facilities by establishing a standardized, consistent framework that enables governments, shipping companies, port authorities, and other stakeholders to collaborate in identifying and addressing threats to maritime security. The ISPS Code is divided into two main parts. Part A is mandatory and lays down detailed requirements for governments, shipowners, and port facilities to follow. Part B contains recommended guidelines that provide flexibility in implementation but are not legally binding. Together, these parts form a comprehensive approach to maritime security, balancing strict compliance with adaptable measures tailored to specific risks and operational environments. Since its inception, the ISPS Code has been continuously updated to address evolving threats, including cyber risks, piracy, and organized crime affecting global trade routes. The Code applies to ships engaged in international voyages, including passenger ships, cargo ships of 500 gross tonnage and above, mobile offshore drilling units, and port facilities serving such ships. Each ship must have an approved Ship Security Plan (SSP) and designate a Ship Security Officer (SSO). Similarly, each port facility must maintain a Port Facility Security Plan (PFSP) and appoint a Port Facility Security Officer (PFSO). These officers are responsible for ensuring that security measures are implemented, drills and exercises are conducted, and compliance is maintained under the oversight of the Designated Authority from the flag or port state. A crucial feature of the ISPS Code is the establishment of three security levels, which provide a flexible and responsive framework to adapt to varying threat environments. Security Level 1 represents the normal condition, where minimum security measures must be maintained at all times. Security Level 2 is applied when there is an increased risk of a security incident, requiring additional protective measures. Security Level 3 represents the highest alert level, where a probable or imminent security threat exists, and extraordinary measures must be implemented to safeguard ships and port facilities. These security levels are set by the Contracting Governments and communicated to ships and port facilities. Ships are required to comply with the security level set by the administration of the port state they are visiting. This ensures that all parties are synchronized in their efforts, minimizing the likelihood of confusion or lapses during periods of heightened alert. The dynamic application of security levels demonstrates the adaptability of the ISPS Code to different threat scenarios, from routine operations to emergency conditions. Another critical element of the ISPS Code is the use of security assessments and plans. A Ship Security Assessment (SSA) identifies potential vulnerabilities, while the Ship Security Plan outlines the preventive, protective, and response measures to address them. Likewise, Port Facility Security Assessments (PFSA) and Plans detail site-specific risks and countermeasures. Both ships and port facilities undergo audits and verifications to ensure that these plans remain effective and updated, considering new threats such as cyberattacks targeting navigation and cargo systems. The ISPS Code also emphasizes international cooperation and information exchange. Contracting Governments are encouraged to share intelligence regarding potential threats, suspicious activities, and lessons learned from incidents. This collaborative approach enhances global maritime security, ensuring that vulnerabilities in one region do not compromise the safety of the wider international shipping community. The Code highlights that maritime security is not only a national concern but a shared global responsibility. Training and drills form an essential part of the Code’s framework. Crew members, ship officers, and port facility staff must undergo regular security training to familiarize themselves with procedures for access control, cargo inspections, restricted area monitoring, and emergency responses. Periodic drills test the readiness of personnel and the effectiveness of the security systems in place. These practices ensure that in times of real threats, the response is swift, coordinated, and efficient. Over time, the ISPS Code has expanded its scope to address emerging challenges. The increasing reliance on digital technologies in maritime operations has introduced new risks, particularly in the form of cyber threats. Recognizing this, the

PERSONAL LIFE SAVING APPLIANCE

The International Life-Saving Appliance Code, known as the LSA Code, is the technical backbone of Chapter III of the SOLAS Convention, setting the global standard for life-saving appliances carried on board ships. It was created to ensure uniform safety requirements across the maritime industry, covering the design, construction, and performance of all critical survival equipment. Its scope includes personal protective gear such as lifejackets, immersion suits, anti-exposure suits, and thermal protective aids; visual signaling devices like parachute rockets, hand flares, and buoyant smoke signals; as well as survival craft, rescue boats, launching appliances, marine evacuation systems, line-throwing devices, and general emergency alarms. By harmonizing specifications worldwide, the LSA Code ensures that seafarers and passengers can rely on equipment that functions effectively in emergencies, regardless of where a vessel is registered or built. Since its adoption in the late 1990s, the LSA Code has been continuously updated to incorporate new technologies, lessons learned from incidents, and advancements in safety engineering. Earlier consolidated editions captured amendments to survival craft standards, performance requirements for lifejackets, and the inclusion of improved thermal protection. Over time, revisions have refined lifeboat release gear standards, introduced stricter testing procedures, and improved design features for ease of use and reliability. These updates reflect the constant commitment of the international maritime community to keep safety requirements relevant and aligned with practical challenges at sea. As of 2025, the LSA Code has seen further refinements that enhance its application to modern vessels. One of the most significant ongoing developments concerns ventilation requirements for partially enclosed lifeboats, aimed at ensuring carbon dioxide concentrations remain at safe levels for all occupants. Another focuses on the safe simulation of free-fall lifeboat launches, requiring test devices to withstand high shock loads with reinforced safety factors. These amendments, expected to take effect in the coming years, highlight the Code’s proactive stance on addressing risks even before they become widespread problems. The continuous improvement process reflects the IMO’s recognition that evolving ship designs and operating environments demand equally evolving safety equipment. Beyond these technical adjustments, the LSA Code provides very detailed requirements for the construction and outfitting of life-saving appliances. Liferafts, for example, must be capable of carrying a minimum of six persons, provide adequate ventilation even when entrances are sealed, and include systems for rainwater collection, radar transponder mounting, and external lifelines. Containers must be clearly marked depending on the voyage type, and painter lines must meet specific strength requirements to ensure safe deployment. Similarly, thermal protective aids are required in survival craft to guard against hypothermia, while immersion suits and lifejackets must not only provide buoyancy but also visibility, durability, and ease of donning under emergency conditions. Altogether, the LSA Code forms a dynamic and indispensable framework that ensures life-saving appliances are reliable, standardized, and effective across the global fleet. It demands rigorous testing, marking, and maintenance regimes to guarantee that equipment performs when needed most. By mandating clear performance benchmarks and updating them regularly, the Code ensures that every seafarer and passenger has the best possible chance of survival in an emergency. As shipping continues to evolve, the LSA Code remains at the center of maritime safety, embodying the SOLAS principle that the preservation of human life at sea is paramount.

Parts of the Anchor System of a Ship

What is the Anchor System of a Ship? The anchor system is essential equipment that secures a ship in place at sea or in port. It consists of interconnected parts such as the anchor, chain, windlass, and locker, working together to prevent drifting, protect the vessel, and ensure safety during operations, emergencies, or harsh weather conditions. Parts of the Anchor System of a Ship 1. Anchor A heavy steel device that grips the seabed to hold the ship in position. It prevents drifting due to wind, waves, or current, ensuring stability and safety. 2. Chain Cable A strong, durable chain linking the anchor to the ship. Its weight and strength allow effective seabed penetration, withstand high tension, and resist corrosion in harsh marine conditions. 3. Windlass A powerful mechanical device used to heave up or let go the anchor chain. Operated hydraulically, electrically, or manually, it ensures safe, efficient anchoring operations and controlled chain movement. 4. Chain Stopper A securing device that locks the anchor chain when not in use. It relieves stress on the windlass, prevents chain slippage, and ensures safety during sailing or rough weather. 5. Anchor Lashing Strong securing arrangement that holds the anchor firmly in place while the ship is underway. It prevents unwanted movement caused by vibration, waves, or ship motion, protecting vessel structures. 6. Hawse Pipe A cylindrical pipe at the bow through which the anchor chain passes from deck to sea. It aligns and protects the chain, preventing friction damage and entanglement.

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