News, case storie & white papers

Even in tiny amounts, chlorine is highly toxic to fish and other aquatic life. Trout larvae die at concentrations as low as 0.006 mg/L, and at just 0.1 mg/L, most marine plankton are killed. Once released, chlorine can also react with organic matter in seawater to form trihalomethanes (THMs) – a group of persistent, carcinogenic…

Whether operating under strict IMO standards or working with NATO-aligned navies, regulatory compliance is at the core of every system we deliver. Our Bioreactors hold MED and IMO MEPC 227(64) certificates, and our systems are designed to meet the highest global standards for onboard wastewater treatment regardless of vessel type or operating environment. “Navigating the…

HJ Lubricators at the Forefront of Future Fuels and Engine Lubrication From 19–23 May 2025, HJ Lubricators participated in the CIMAC Congress in Zurich, one of the world’s most important gatherings for experts in large engine technology and propulsion systems. With over 200 technical presentations, the congress showcased the latest developments in alternative fuels, digitalisation,…

Precision in lubrication is essential to meet future environmental and operational targets Cylinder lubrication plays a critical role in marine engine efficiency, emissions, and component longevity. This paper explores the capabilities of an electronically controlled, common rail-based lubrication system using the Swirl Injection Principle (SIP). Based on experimental research conducted by Aalborg University and HJ…

What is Biological Wastewater Treatment? Biological wastewater treatment is a process that uses microorganisms to break down organic matter in sewage. This method is effective in removing contaminants from water, making it suitable for discharge into the environment. The process of biological water treatment involves three primary stages: 1. Pre-treatment (Screening Phase) Water is first…

From graduate to PhD student: a journey of responsibility and innovation at HJ Lubricators When Magnus Munk Jensen, a newly graduated engineer from Aalborg University, was looking for his first job, he chose HJ Lubricators. It turned out to be a time of great opportunities and responsibility from day one. In 2021, now 27-year-old Magnus…

Building strong customer relationships  In a rapidly evolving industry, strong customer relationships are more important than ever. HJ Lubricators recognizes this and has made significant changes to its sales and key account management teams to better serve its clients.  As we entered 2025, HJ Lubricators presented a new and stronger sales organization with a range…

HJ Lubricators to showcase smarter marine lubrication solutions at Sea Asia 2025 As the maritime industry shifts towards decarbonisation, dual-fuel engines, and slow steaming operations, HJ Lubricators, a division of G&O Maritime Group, is at the forefront, providing innovative lubrication solutions tailored to these emerging trends. Decarbonisation poses a major challenge for the maritime sector,…

Optimising Lubrication and Scavenging Dynamics: Insights from Advanced CFD Modelling Introduction: The maritime industry is under increasing pressure to optimise engine performance, reduce emissions, and comply with ever-tightening IMO regulations.  HJ Lubricators (HJL) stands at the forefront of innovation, constantly evolving to meet these challenges. This whitepaper delves into a recent study that employs advanced…

We are proud to announce that HJ Lubricators A/S has officially entered into an agency agreement with OCEANiST ENGINEERING, a leading provider of marine and offshore solutions in Turkey. The agreement was signed at Expomaritt, marking an important step in strengthening our presence in the Turkish maritime sector. With this collaboration, Mark Kristensen, Head of…

Proactive support as a key differentiator  Service is the backbone of HJ Lubricators’ strategy for 2025. With a clear focus on proactive customer support, the company is reshaping its after-sales operations to ensure maximum uptime for its customers.  In a sector where the distance between product buyers and end users can be significant, HJ Lubricators…

A New strategy for HJ Lubricators: Customer-centric solutions  HJ Lubricators is entering an exciting new chapter, driven by a fresh brand identity and a renewed commitment to delivering customer-centric solutions. As the leading provider of cylinder lubrication systems for two-stroke marine engines, HJ Lubricators aims to redefine how it engages with shipowners and shipyards.  With…

For many years, Gertsen&Olufsen has been best known for its two market-leading products: vibration compensators and bioreactors. These products have set the standard in the maritime industry and have become synonymous with quality and innovation. Now, we are taking the next step by breaking down the brand name into two distinct product names that will…

NEWS Dear Customers and Business Partners. Welcome to a New Era for HJ Lubricators As we step into 2025, we are excited to share a significant milestone for our company – we are proud to unveil our new brand identity: HJ Lubricators. This new identity builds on the strong foundations we have established over decades.…

The Customer Challenge: Replacement for Compliance and Capacity At G&O Bioreactors, we specialize in designing bioreactors that treat wastewater biologically, ensuring operations that protect marine ecosystems from untreated wastewater. This case study explores how we provided a leading offshore operator with a tailored wastewater treatment solution, ensuring compliance and operational efficiency. A major offshore energy…

As environmental regulations tighten and operational costs increase, shipowners need to make smarter investment decisions for their vessels. While the market for wastewater treatment systems is saturated with options that are initially less expensive, G&O Maritime offers a bioreactor system that provides significant operational advantages and long-term savings. This article explores the value propositions behind…

NEWS Last week we had the pleasure of hosting a team from M.I.E. for two days of intensive and successful agent training, led by our Head of R&D, Nikolaj Kristensen. With updated knowledge and new tools, M.I.E. is now even better equipped to represent Hans Jensen Lubricators in both Cyprus and the UAE. It was…

NEWS We are pleased to introduce our new Key Account Manager (KAM), Andreas Bograd, who will be a central part of our strategy to strengthen and develop our customer relationships. As KAM, Andreas will serve as the customer’s primary point of contact with HJL, drawing on resources from across the organization to ensure the best…

The maritime industry is facing unpredictable engine performance as the transition to low-sulfur fuels and the trend toward slow steaming introduce unforeseen wear on critical components. Engines running at lower RPMs face unique challenges, further complicating the situation. The solution lies in advanced lubrication and monitoring systems, which provide precise control over cylinder and piston…

The Chilean authorities have recognized our Advanced Membrane Bioreactor with a certification, marking a significant advancement in the efforts to achieve cleaner oceans. This recognition not only confirms the effectiveness of our technology but also the importance of biological treatment methods in protecting the marine environment. “While traditional wastewater treatments have relied on chemical and…

While our systems are designed to handle wastewater biologically without chemicals, unexpected fluctuations or contaminants can occur. We recommend STP Solupak, as this product acts as a safety net, proactively maintaining optimal conditions for the microbes in the bioreactors. For years, G & O Bioreactor has worked closely with GNC Marine. The products offer high performance…

ARTICLE Reducing CO2 emissions across operations is a clear goal for many businesses today. The climate is changing, and this is having significant and visible effects on nature, animal life and humanity.  Although shipping is the most energy-efficient method for moving cargo over long distances, the sheer size of the industry means that marine vessels…

Handling wastewater on larger ships is becoming an increasing challenge due to tighter environmental legislation and customers’ growing demand for green solutions. Danish JD-Contractors, which operates several large ships, has experienced significant problems with their maritime purification systems. Bjarne Sørensen, Marine Superintendent at JD-Contractors, says: “On our ship CABLE ONE, we had two purification systems…

RELEVANT TO: All users of HJ Smartlube June 2024 Software update 24.05 Update your cylinder lubrication system with the latest software for improved user experience and bug fixes. User experience We have optimized the back end of the system so users get immediate response using the HMI. The feed rate graph on the Home page…

The tunnel is expected to play a significant role in Europe’s future sustainable transport network by encouraging the shift of freight transport from road to rail and thereby providing an efficient alternative to road transport. At Gertsen & Olufsen Bioreactors, we are proud to be part of the Fehmarnbelt Tunnel project. Our water treatment plant,…

Efficient cylinder lubrication does not eliminate the wear of liners and piston rings completely. The goal is to control the cylinder wear rate and keep it on a normal level and to prevent other harmful types of wear. Cylinder wear in two-stroke marine engines refers to the gradual deterioration of the inner surface of the…

In the marine industry, various wastewater treatment methods are employed, each tailored to specific vessel types, offshore facilities, or environmental regulations. Common techniques encompass physical processes like sedimentation and filtration, chemical treatments involving disinfection and coagulation, and natural sewage treatment methods and biological processes such as activated sludge treatment or membrane bioreactors. “G&O Bioreactors offer…

RELEVANT TO: All users of HJ Smartlube lubricators September 2023 Software update 23.07 Update your system with the latest software for improved user experience, better system overview and added log-in security. Improved usability and system overview We have made several improvements to the user interface and features of our most advanced lubrication system, HJ Smartlube…

1. What is the purpose of lubrication technology for marine engines? Lubrication technology for marine vessels involves the use of advanced lubrication systems to reduce friction between cylinder liner and piston rings by forming a thin and even oil film. Furthermore, lubrication prevents wear of liner and piston rings, neutralizes sulphuric acids, keeps the piston,…

Scuffing in cylinder liners is a serious risk for marine vessels that might lead to costly engine repairs and prolonged downtime. By understanding the causes, you can take preventive measures to reduce the risk of scuffing and ensure optimal engine performance, reliability, and longevity. With the right knowledge and precautions, you can protect your engine…

The maritime industry relies heavily on two-stroke marine engines to power the vessels. These engines are highly efficient. However, they require proper lubrication to function at their best. Lubrication is an essential component of any engine, and it is especially critical for two-stroke marine engines. The right lubricant and lubrication system help to reduce friction,…

Cylinder condition is a critical factor that affects the performance and longevity of marine engines. Proper lubrication is essential to ensure optimal cylinder condition and prevent wear and damage. In this blog post, you can learn more about the importance of cylinder condition monitoring and how much cylinder wear is acceptable. Cylinder condition monitoring Cylinder…

Marine vessels rely on lubricating oil to keep their engines running smoothly and efficiently. However, excessive lube oil consumption can lead to increased costs, decreased efficiency, and higher emissions. At Hans Jensen Lubricators, we understand the fine balance between reducing lube oil consumption while maintaining optimal engine performance. By reducing emissions and lube oil consumption,…

The process of biological water treatment The process of biological water treatment involves several stages.  Why use biological waste water treatment? Biological treatment of waste water is an effective and efficient way to remove contaminants from water. It is also a relatively low-cost and environmentally friendly process, as it relies on natural biological processes rather…

The purpose of this Service Letter is to guide the user in optimizing the cylinder oil feed rate, so the full saving potential and better cylinder condition made possible by the Hans Jensen’s Swirl Injection Principle (HJ SIP) valves

The main purpose of this update is to improve the support of your Hans Jensen lubrication system by introducing a log and to boost the user experience using graphs. Additionally, we have added flexible scheduling of the ACS feature and renewed passwords for improved login security.

This Service Letter describes the benefits of the HJ non-return injection valves compared to standard non-return injection valve. With HJ non-return injection valves optimum design and quality is ensured.

Lacquering occurs on areas of the cylinder wall, which at a previous point has been exposed to additional corrosive wear causing the area to be slightly retracted from the running surface which is in contact with the piston rings. Read more here.

In the world of marine vessels, flexible cylinder lubrication is essential for ensuring the longevity and efficiency of the engine. However, excessive lubrication can lead to a range of problems, subsequently increasing maintenance costs, lower  performance, and environmental concerns. That’s why it’s important to pay attention to lubrication feed rate, and take steps to minimize…

Case: A2SEA Challenger, helping a customer with a fast solution to their problem

There is a clear connection between low load operations and an increased risk of deteriorated cylinder condition. Our engineers see a hidden risk inside the engine.

A joint test with MAN Diesel & Turbo (MDT) and Hans Jensen Lubricators determines the effectiveness of HJ Lubtronic SIP on a super-long stroke engine. 9S90ME-C

Hans Jensen Lubricators has joined G&O Maritime Group to strenghten further development and growth.

The shipping industry’s ambitions for reducing CO2 emission are likely to follow several technological pathways, so a more flexible and modular lubrication system is now available, says Dr Rathesan Ravendran.

Fleet owners can optimize OPEX and prepare for green fuels by using Hans Jensen lubricators.

The marine vessel Eagle Varna was experiencing a high feed rate of the cylinder lube oil. Hans Jensen installed HJ SIP valves on MAN Alpha, which resulted in a significant reduction of cylinder lube oil consumption. 7S80MC-C

Hafnia, member of BW Group, upgraded the engine’s cylinder lubrication system onboard their Medium Range Product Tanker, “BW Egret” (6S50ME-B) in January of 2020. The lubrication system was upgraded, as the liners had a wear rate that exceeded the maximum allowable limit.

”K” Line Bulk Shipping chose Hans Jensen Lubricator’s solutions for 10 sister vessels and reduced lube oil consumption by 55%

Customisation of our state-of-the-art split unit bioreactors is a task G&O rises to.

Tuesday Oct. 6. 2020 Hans Jensen Lubricators A/S has received an award for most successfull business 2020. The award is given to companies with impressive financial results and high growth, year after year. The business award, which Spar Nord and BDO have established in 2019, pays tribute to the elite of small and medium-sized companies…

NOVEMBER 2019 This service letter contains information about HJ Marine PC running Windows 10. The purpose of this Service Letter is to help customers who are experiencing problems with their marine pc. Please contact our After Sales department for further information and scheduling a visit by our engineer. T: +45 9857 1911 E: Facing […]

OCTOBER 2016 Relevant for users of HJ SIP valves The purpose of this Service Letter is to guide the user in optimizing the cylinder oil feed rate, so the full saving potential and better cylinder condition made possible by the Hans Jensen’s Swirl Injection Principle (HJ SIP) valves can be realized. Please contact our After…

MARCH 2016 The following guide is designed to help you find and e-mail the different files needed to assist in debugging and troubleshooting. Please contact our After Sales department for further information and scheduling a visit by our engineer. T: +45 9857 1911 E: E-mailing files til HJL The mentioned files will aid Hans […]

A complete biological sewage treatment plant to be used under the most extreme conditions, made in a simple standard container; that was the task ‘India’s National Center for Antarctica and Maritime Research’ gave us. In November 2014 the plant was completed and shipped to NCAOR’s permanent research station in Antarctica via Cape Town, South Africa.

MAY 2015 Relevant for HJ Non-Return valve users Feed rate adjustment The purpose of this Service Letter is to guide the user in optimizing the cylinder oil feed rate, so the full saving potential and better cylinder condition made possible by the Hans Jensen’s Non-Return valves can be realized. Please contact our After Sales department…

‘Clean Sailing’ wrote about Lauritzen Kosan new-buildings fitted with next-generation biological sewage treatment plants.