HJ SIP Lubrication

Why choose HJ SIP Cylinder Lubrication

There are significant advantages associated with installing HJ SIP valves, as they are the basis for the application of the SIP lubrication principle. With HJ SIP, fresh cylinder oil, in adjusted amounts, is supplied with every piston stroke, directly onto the upper liner wall. This provides the potential for reductions in cylinder oil consumption and optimised conditions for liners and piston rings.


Cylinder lubrication is a crucial factor for maintaining a good engine condition on 2-stroke diesel engines, as it limits the wear and corrosion on pistons and cylinders. From an economic point of view, cylinder lubrication is a significant part of the ship operational costs. Based on this, Hans Jensen Lubricators A/S has developed HJ SIP Lubrication.

HJ SIP Lubrication is a unique method within the field of cylinder lubrication that ensures an optimum distribution of the lube oil at a minimum lube oil consumption. 


SIP is an abbreviation for ’Swirl Injection Principle’ and refers to the principle of using the scavenging air swirl of the engine to distribute the lube oil. For each piston stroke the engine takes, a small quantity of lube oil is sprayed out of the HJ SIP valves. The lube oil is sprayed into the engine’s scavenging air swirl, whereby the lube oil is distributed in a thin and even layer on the cylinder wall. Thereby, an optimum cover of the top of the cylinder wall is achieved, where the need for cylinder lubrication is largest.


HJ SIP Lubrication can be implemented on both newbuildings and vessels in operation.  The necessary machining of the cylinders at installation depends on the type of HJ SIP Valve.

Read about the various types of SIP valves in the menu to the left:

View animation of our HJ SIP Principle here

View animation of the SIP Principle vs. conventional lubrication here


The function of the cylinder lubrication in ship operation is to reduce the friction between piston and cylinder, by which the wear is reduced.  At the same time, the lube oil neutralises the acid formation during combustion, which is a direct cause for corrosion.

Hans Jensen Lubricators A/S has worked on this topic for nearly a century and has thus gathered a wide experience within this field. Based on this, Hans Jensen Lubricators A/S has developed a product that contributes to a better distribution of the lube oil than traditional lube valves, while the lube oil consumption is reduced.

HJ SIP Lubrication sprays a sufficiently small quantity of lube oil into the scavenging air swirl on a 2-stroke diesel engine, whereby the centrifugal power inside the scavenging air swirl distributes the lube oil evenly on the cylinder liner. By using HJ SIP Lubrication, it is possible to reduce the operational costs for both lube oil consumption and maintenance. In addition, a reduction of the environmental impacts and the formation of oil sludge and engine smoke is obtained. 

System description

The HJ SIP valve is characterised by being adjusted to open at a given oil pressure received through the pressure pipe from the lubricator. By means of the pressure, the nozzle of the HJ SIP valve turns a sufficiently small quantity of lube oil into a spray, which is sprayed into the cylinder.

Based on the engine’s size, an adequate number of HJ SIP Valves are mounted in the cylinder liner, so that each spray overlaps the next. The HJ SIP valves spray lube oil into the scavenging air swirl, whereby the lube oil is distributed on the entire cylinder liner by means of the centrifugal power of the engine’s scavenging air swirl. Leak oil from the valves is lead back to the vessel’s supply tank which leads the lube oil to the lubricator. 


This new technology can be applied on both vessels in operation and on newbuildings, as it in principle can be applied on all known 2-stroke engine designs. In connection with newbuildings, it is an advantage to ensure that HJ SIP Lubrication is specified from the beginning.

Retrofit on engines with timed HJ Lubricators provides interesting opportunities for savings. At installation, the traditional cylinder liners must be modified before the HJ SIP valves can be mounted. For the HJ SIP I valve this means machining of the liner, both inside and outside. Therefore, the installation of the HJ SIP I valve requires that the liners are pulled. At the installation of the HJ SIP II and HJ SIP III valves, only a minor machining inside is required and therefore it is not necessary to pull the liners during the machining.

Should the liners need to be renewed, it is an advantage to order liners which are already prepared for HJ Lubrication so that subsequent modification is not necessary.

Please feel free to contact us for further information on HJ SIP valves.

Read more about the HJ SIP I Valve. Click here

Read more about the HJ SIP II Valve. Click here

Read more about the HJ SIP III Valve. Click here

Maintenance interval

The function of the HJ SIP valves should be checked at appropriate intervals, e.g. when renovating a cylinder, or after every 12,000-15,000 running hours. We recommend that the spray, the closing pressure and the quantity of leak oil are checked at appropriate intervals, for example every two years. In addition, we recommend that the distance between the cylinders and the tip of the needle is measured to ensure that wear on the cylinders does not lead to an exposure of the tip of the valve which may then be damaged by the piston rings. The distance is specified in the manual for the HJ SIP valves. 

Adjustment of the closing pressure

The closing pressure inside the HJ SIP valves are specified in the manual for the HJ SIP valves. The closing pressure can easily be tested onboard, using an ‘HJ Nozzle test rig’ with thin oil, e.g. hydraulic oil with the viscosity index SAE 15-20.

If the closing pressure deviates from what is specified, it must be adjusted. This is done by removing the screw (17) and the cover (16) and then adjusting the adjusting screw (13). By turning the adjusting screw counter-clockwise the pressure is increased and by turning the screw clockwise, the pressure is reduced.

Measuring of leak oil

When measuring the leak oil, it is recommended to dismount the return pipe (26) in the screwed connection (27) and block the return pipe. The oil flow must be stable before the measuring of the leak oil can be initiated. Due to the relatively small quantities of leak oil, the measuring should be carried out over an appropriate number of hours. At delivery, the leak oil quantity of the HJ SIP valves is 15±10 ml/h. The leaking quantity may be increasing over time. Therefore, we recommend that the leaking quantity is checked at appropriate intervals, e.g. every second year or when renovating a cylinder.

Dismounting a valve

We recommend that the HJ SIP Valves are sent to Hans Jensen Lubricators A/S for renovation. If it is necessary to renovate an HJ SIP Valve, please follow the instructions for the concerned valve.

Please feel free to contact us for further information on maintenance of HJ SIP Valves.

Read more about maintenance of the HJ SIP I Valve. Click here 
Read more about maintenance of the HJ SIP II Valve. Click here
Read more about maintenance of the HJ SIP III Valve. Click here

On this page you can find replies to a number of questions, which we are frequently asked on HJ SIP Valves. If you find that the replies are incomplete, you are welcome to contact us with a description of your question or problem. We shall then try to help you best possible.

  • Is it possible to retrofit HJ SIP Lubrication?
    • Yes, it is possible in most cases. The existing plants which are easiest to retrofit with HJ SIP Lubrication are those which are equipped with timed lubrication.

  • Does the cylinder wear increase if I cut down on the lube oil?
    • No, not necessarily. Our experience shows that with the correct distribution of cylinder oil it is possible to reduce the cylinder lube oil consumption to approx. half of the engine designer’s recommendation and on top of that obtain reduced cylinder wear.

      There will of course be a point where one must decide how large a wear is acceptable as compared to the possible reduction in the cylinder oil consumption. At present, the limits are not clear, but saving 50 % and at the same time gain better cylinder condition is hopefully a satisfactory place to start.

  • Are special HJ lubricators applied for HJ SIP Lubrication?
    • Yes, special lubricators are to be applied, which among other things contain modified cam shafts. The lubricator types to be applied for HJ SIP are: HJ 125, HJ 126, HJ 135 and HJ 145.

  • Have problems with HJ SIP Lubrication been observed?
    • Yes, in connection with the use of a specific type of cylinder lube oil we have experienced that particles from the cylinder lube oil have lumped preventing the valve needle from moving correctly inside the guide. This problem has been solved as described below. HJ SIP valves, in which the cylinder lube oil does not lump, still show a stable and satisfactory function.

      Our original goal was to make the HJ SIP Valves as tight as possible. We had chosen this goal to prevent leakage and thus avoid taking leaking quantities into account in connection with the calculation of the system’s efficiency and the adjustment of the lubricator. We wanted to make the system as simple as possible.

      However, as we wish that the valves can be used regardless of the type of cylinder lube oil you choose, we have decided to deviate from this goal. Therefore, a flow quantity which prevents the lube oil from lumping is now allowed.

  • Are HJ Lubricators for HJ SIP Lubrication approved by MAN B&W?
    • Yes, according to LL01-30 the lubricators to be applied for HJ SIP Lubrication have been approved. This means that even if you are not ready to specify HJ SIP Lubrication for your newbuilding right now, it can be prepared so that it can be easily changed, when you want to install.

  • Is HJ SIP standard on MHI built UEC and RTA engines?
    • Yes, Mitsubishi Heavy Industries apply as the only of the major engine builders the HJ SIP system as standard on their engines. This has lead to large reductions in the cylinder lube oil consumption and cylinder wear on MHI newbuilt and retrofitted engines.

      In 2001, Mitsubishi Heavy Industries and Hans Jensen Lubricators A/S concluded a license agreement on HJ SIP.

  • Is HJ SIP Lubrication patented?
    • Yes, it is patented by Hans Jensen Lubricators A/S. Patents are issued on the lubrication principle and patents have been applied for the practical designs.

  • Is the extend of the engine designer’s guarantee smaller on new engines with HJ SIP?
    • We cannot imagine. We have seen documentation for ordinary guarantee conditions, but no confirmation on the contrary. However, we have seen that engine designers and engines builders try to promote the sale of alternatives for the HJ SIP system.

  • Is it a good idea to combine HJ SIP injection with Alpha Lubricators?
    • First of all, we believe that there should not be any problems in combining the HJ SIP Cylinder Lubrication with an Alpha lubricator. However, it requires that the HJ SIP injection function is approved by MAN B&W. Secondly, the Alpha lubricator only provides the lube oil intermittently. It will not make use of the HJ SIP system’s ability of supplying the cylinder wall with fresh alkaline cylinder lube oil in each revolution of the engine. A function which is considered desirable, as most of the cylinder wear according to MAN B&W and Wärtsilä is corrosive.

      Therefore, a combination of HJ SIP and Alpha is connected with the acknowledgment of the benefits of the HJ SIP system’s oil distribution function and the selection of the desired/acceptable oil injection frequency. In the light of the desired acid neutralising effect, we find it difficult to see that a combination is better than HJ SIP with conventionally timed lubricators. New information may naturally change this view.

      An electronically driven HJ SIP lubrication system is under development, but only the interest of the market can ensure that this solution is used.

  • How do you prepare a newbuilding for HJ SIP Lubrication?
    • If you have a newbuilding on order and would like to get the system prepared for possible future use of the HJ SIP Lubrication, you should contact the engine builder to get the following minor adjustments in the specification:

      HJ Lubricators, which are compatible with HJ SIP Lubrication, must be specified. These lubricators are approved by MAN B&W and Mitsubishi Heavy Industries, like our other lubricators

      The drive of the cylinder lubricator must be strengthened for HJ SIP Lubrication. This means, among other things, the use of modified shafts to reduce the torsion. Liners must be prepared internally with grooves for HJ SIP Lubrication.

  • On which engine designs has HJ SIP Lubrication been installed?
    • HJ SIP Lubrication is installed as retrofit on all major engine designs that is MAN B&W, Sulzer and MHI designed 2-stroke engines.

      Newbuildings with HJ SIP Lubrication have been delivered since 2002. This includes both MAN B&W, MHI and Sulzer engines. Shop trials and service for all engine designs have been carried out with success.

      In April 2010 status is that HJ SIP is installed on/or ordered for more than 600 engines.

      The HJ SIP principle can be applied with the same advantages on ME-, ECO- and RT-Flex-engines.

      When there is no chain drive for the traditional mechanical driven lubricators, as is otherwise the case on e.g. MAN B&W’s MC engines, it is, based on experience from other engine designs, possible to apply mechanical lubricators with electronic timing.

  • Are savings in the cylinder oil consumption against the interests of the market?
    • This question can be answered neither clearly nor unambiguously. Many interests are involved and not all actors have the same interests.

      On one side, there is the ship-owners who are consumers of the cylinder oil. They pay for the oil, they are governed by the prevailing environmental requirements, they pay for necessary spare parts etc. It must be natural that the ship-owners have a clear interest in minimizing the consumption of lube oil most possible. The costs for cylinder lube oil are large for just one vessel.

      In this connection it is important to remember the price development of the past few years. It is our experience that the ship-owners today are ready to invest more and spend more time in the attempt to reduce the lube oil consumption. We give them the possibility.

      Quite as natural it must be that suppliers of cylinder lube oil do not have the same interest in reducing the lube oil consumption. On the other hand, oil companies today focus more on the prevailing environmental requirements all over the world. Therefore, we believe that also the oil companies today have a different and more progressive view on the possible reductions.

      The engine builders are presumably fairly indifferent as regards this problem. They apply cylinder lubricators, but are not responsible for the daily operation of the vessels, and they do therefore not have an obvious interest as far as savings in the lube oil is concerned.

      All things considered, it is our opinion that the savings potential is considerable, and that this is not against the interests of the marked, when we focus on the major interested parties of the market.

  • How is an HJ SIP retrofit typically carried out?
    • The cylinder lubricators are replaced and after a minor machining of the cylinder liners, the SIP valves are mounted.
      Typically, the retrofit will be carried out during docking or port call. Parts of the process may be carried out when the vessel is sailing. However, the major part such as mounting of lubricators and SIP valves require that the engine is turned off.

  • Does Hans Jensen Lubricators A/S recommend a special filtering?
    • Yes, Hans Jensen Lubricators A/S recommends as standard a 40µ filter at the oil supply for the lubricators.