What is Drydocking

Delving into the understanding of drydocking, it is a pivotal process in marine maintenance that entails the removal of a ship from water for thorough inspection, servicing, and repair. This procedure is an indispensable part of ensuring vessel longevity and safety, as well as optimizing performance.

A drydock, specifically designed for this purpose, houses the ship. This enormous structure can be drained, enabling workers to access the entire hull of the vessel. Here, the ship undergoes a comprehensive examination, with every inch scrutinized for signs of wear, damage, or corrosion. This extensive analysis allows potential problems to be identified and addressed before they escalate into serious, costly issues.

The ship is also cleaned thoroughly to remove any marine growth – a critical step in preventing the spread of invasive species. Furthermore, any necessary repair or replacement work is carried out during the drydocking process. This can range from minor adjustments to major overhauls, including the replacement of large sections of the ship’s structure.

Lastly, the ship may also be upgraded or modified to improve its efficiency, capabilities, or compliance with new regulations. This holistic process ensures the ship’s optimum performance and safety at sea.

Our 30year long experience in the field of vessel maintenance, our experienced and qualified staff, and our massive state-of-the-art equipment guarantee that our customers will be provided with nothing less than high-quality services and expertise, always adjusted to their budgeting forecast.

general ship & yachting services

Hull treatment

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Tanks treatment

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Cargo holds treatment

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Bilges treatment

Drydocking Importance in Shipping Industry

Undoubtedly, drydocking plays a pivotal role in the shipping industry, bolstering the safety, efficiency, and longevity of the world’s maritime fleet. It is an essential process that ensures the optimal operational condition of these vessels, particularly as they are continually exposed to harsh marine environments that can lead to corrosion, structural damage, or fouling by marine organisms.

Drydocking allows for comprehensive inspections, maintenance, repairs, and upgrades, which are critical to maintaining a ship’s quality and safety standards. The process involves a thorough examination of a ship’s structure and machinery, including the undercarriage, which typically remains submerged and is, therefore, prone to damage. During drydocking, any necessary repairs, replacements, or enhancements are carried out, enhancing the vessel’s performance and extending its service life.

Moreover, drydocking contributes to the overall efficiency of the shipping industry. By ensuring vessels are in top condition, the process minimizes unexpected downtime, reduces the risk of maritime accidents, and enhances fuel efficiency by keeping hulls clean and streamlined. Therefore, drydocking is not just a maintenance routine; it is a strategic component of successful shipping operations.

Stages of the Drydocking Process

The drydocking process is composed of several crucial stages, each playing a vital role in the maintenance, repair, and upgrade of a vessel. It begins with an inspection, where experts meticulously examine the ship’s structure and systems to identify any issues requiring attention. This can range from minor wear and tear to significant structural damage.

Following the inspection, the team proceeds to cleaning and repainting. The vessel’s surfaces are cleared of any biological growth and corrosion, then treated with anti-corrosive paint to protect against seawater.

The next stage involves the actual repair, replacement, or refurbishment of the identified issues. This can include tasks as diverse as welding, replacing metal plates, repairing mechanical parts, or even upgrading systems for improved efficiency.

The final stage of the drydocking process is the testing phase, where all repaired and upgraded systems are rigorously tested to ensure they function as expected. After passing these tests, the vessel is considered ready to return to service, with its integrity and efficiency restored or even enhanced.

It is a complex but vital process, ensuring the ongoing safety and performance of maritime vessels.

Inspection Stage Details

In our drydocking services, thoroughness is paramount during the inspection stage, where our team of marine experts meticulously examines every inch of the vessel, both above and below the waterline, to identify any potential issues or areas in need of repair. This comprehensive evaluation includes the hull, propulsion system, living quarters, and all operational systems. The objective is to ensure the vessel’s structural integrity, safety, and operational efficiency.

The inspection stage begins with a visual examination to identify obvious signs of wear, damage or corrosion. This is followed by more specialized inspections using advanced diagnostic tools and technologies, such as ultrasound and thermographic imaging, to detect any hidden issues.

Our inspectors also evaluate the vessel’s compliance with maritime regulations and standards. Any deficiencies are documented, and a detailed report is generated. This report serves as a blueprint for the subsequent maintenance and repair stages, outlining the necessary corrective actions and improvements.

Through our rigorous inspection stage, we can ensure that every vessel leaving our drydock is in top condition, ready to navigate the world’s seas safely and efficiently. Our process underscores our commitment to quality, safety, and customer satisfaction.

Cleaning and Painting Procedures

Following a thorough inspection, our drydocking services proceed to the critical stages of cleaning and painting the vessel. This process is fundamental for maintaining the ship’s performance and longevity.

The cleaning phase involves removing biological growth and corrosion from the ship’s underwater body. Utilizing high-pressure water jets and grit blasting, our team meticulously cleans the hull down to the bare metal. This process eliminates any residues and prepares the ship for painting, ensuring optimal adhesion of the paint layers.

The painting procedure protects the vessel from harsh marine conditions. Our professionals apply a prime coat first, followed by anti-corrosive paint layers. The type and number of coats depend on the ship’s operational conditions and regulations. We use environmentally friendly, high-quality marine paints that effectively resist corrosion and fouling.

Moreover, we incorporate technological advancements like robotic painting and cleaning systems, ensuring efficiency and uniformity. This high-tech approach reduces human error and enhances the longevity of the paintjob.

Repair and Replacement Work

Once the cleaning and painting procedures are complete, attention must be turned to crucial repair and replacement work. This phase is indispensable for maintaining the vessel’s structural integrity and operational efficiency.

During this process, our team of seasoned experts meticulously examines the ship, identifying areas that have been compromised due to wear and tear or accidental damage. This can mean anything from minor adjustments to significant overhauls on the hull, deck, or internal machinery.

Repairs could involve welding to mend cracks or fractures, or replacing damaged steel plates to ensure the vessel’s robustness. Mechanical parts like pumps, valves, or motors that have worn out may also need replacement. The objective is not merely to fix evident issues but to anticipate potential problems and rectify them proactively.

This meticulous attention to detail in repair and replacement work bolsters vessel longevity and safety, ultimately fostering optimal performance and operational efficiency. It is a testament to our commitment to provide comprehensive drydocking services, upholding the highest standards of quality and precision that our clients have come to expect.

Upgrades and Modifications Opportunities

While diligently executing repair and replacement tasks, our drydocking services also present opportunities for vital upgrades and modifications to the ship. These improvements can significantly enhance the vessel’s performance, safety, and operational efficiency.

Upgrades can range from installing advanced navigation systems and automation technology to retrofitting energy-efficient engines or enhancing onboard facilities. These improvements not only contribute to superior operational efficiency but also promote environmental sustainability by reducing energy consumption and emissions.

Modifications, on the other hand, are primarily aimed at adapting the ship to new operational requirements or regulations. This could involve modifying the hull design for improved hydrodynamics, restructuring cargo holds for increased capacity, or implementing safety features to comply with evolving maritime regulations.

Our team of skilled engineers and technicians work closely with the ship owners and operators to understand their specific needs and objectives. They propose tailored solutions that leverage the latest marine technology and adhere to the highest industry standards.

Technological Innovations in Drydocking

Leveraging the latest advancements in technology, our drydocking services continually evolve to enhance accuracy, efficiency, and sustainability in ship maintenance and repair processes. We utilize cutting-edge technologies ensuring a comprehensive assessment of the ship’s condition. This enables us to identify issues early, reducing downtime, and enhancing ship performance and life span.

Robotics also play a significant role in our processes; robotic systems are deployed for cleaning and painting tasks, delivering high-quality results in less time while minimizing human error.

This commitment to innovation sets us apart, ensuring that we deliver superior drydocking services in line with the future of the shipping industry.

A. Hilios Drydocking Services

In conclusion, drydocking is an essential component in the shipping industry, focusing on vessel safety and reliability. This procedure encompasses inspection, cleaning, repair, and upgrades, all facilitated by technological advancements.

Its comprehensive approach, combined with a commitment to excellence, distinguishes the services provided by this shipyard, driving the continual advancement of marine operations.


The company uses hydroblasting machines of the best new technology with pressure from 100 to 3500 bar. covering all the requirements of international standards.The method of water blasting removes salts, rusts that are well adhered and not and the organisms that are on the surface of the ship’s hull. Αs a cleaning method is considered environmentally friendly. All HPS water blasting operations adherence to German Standards STG NORMA 2222.


All types of painting are applied such us brush painting, roller painting, air spray painting, pressure spot spray painting, airless spray painting on ships, tank surfaces and other land or offshore facilities. At HPS we give the desired result and always in accordance with the specifications of the paint manufacturers and the BRITISH STANDARD.


The company A. HILIOS ltd. offers certified services for cleaning ships as well as yachts.For the cleaning of the ships, we use suction pumps, hydraulic machines and sandblasting machines.We can carry out any kind of cleaning with technical or chemical means by providing the appropriate standards of hygiene and safety rules.


Sandblasting is the ejection of sand with very high pressure that is achieved mechanically. This is a technique for cleaning rough surfaces. The result of the impact is the removal of rust iron oxides.The great advantage of sandblasting is the creation of roughness on the surface resulting in the very good adhesion of the paint layers.

Propeller treatment

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Propeller polishing

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Propeller brushing

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Shafting propeller & Rubber measurements

Treatment of chain, anchor and locker

Renewal of anodes

Sea chest treatment

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