Hans Jensen Lubricators A/S - 100 years

MEP-Regulation

Background

MEP regulation is designed for engines with timed cylinder lubrication, meaning that the drive of the lubricator is RPM dependent.  In these situations, the lube oil consumption in part load areas is usually higher than necessary. 

Functionality

The MEP regulation regulates the lube oil consumption according to the effective mean pressure, producing a reduction of the lube oil consumption in the part load areas.

In practice, the quantity of the lube oil is regulated by a mechanical linking between the MEP regulation and the fuel regulation shaft of the engine.

Furthermore, a reduction of the lube oil consumption will lead to more clean cylinders and exhaust, which reduces the risk of scavenging air fires. 

Installation

The MEP regulation is installed directly on the lubricator. Therefore, it is possible to install the MEP regulation on an existing HJ Mechanical Lubricator and newbuildings.
Please feel free to contact us for further information on MEP regulation.

Purpose

MEP regulation is designed for engines with timed cylinder lubrication where the lubricator’s drive is RPM dependent. In these situations, the lube oil consumption in the part load areas is as standard higher than necessary.

With MEP regulation a cylinder lubrication which regulates the mean effective pressure can be created, thereby achieving a reduction of the lube oil consumption.  Furthermore, a reduction of the lube oil consumption will lead to cleaner cylinders and exhaust that reduces the risk of scavenging fires. 

Construction

The MEP regulation can be installed on the top of the lubricator (1) and be connected to the fuel regulation shaft (5) with a pressure rod (3).

This means that the MEP regulation’s cam (8) is moved proportionally with the movement of the fuel regulation shaft (5).

On the cam is situated a cam follower (9), which is following the shape of the cam.

The cam follower is, through a shaft (10) connected to a series of arms, each pulling an adjusting bolt, thus regulating the stroke length of the lubricator. 

Reductions

If you use conventional RPM dependent lubricators on Fixed Pitch Propeller (FPP) engines, the lube oil consumption will be proportional with the rpm of the engine, please see figure 1 above.

On Constant Speed engines (CPP or stationary plants), the lube oil consumption is also constant, regardless of the size of the engine’s load, please see figure 2 above.

On engines with variable revolutions and CPP, the two above mentioned principles are combined.

In all these cases considerable quantities of lube oil can be saved by applying MEP proportional regulation.

To this we can add, that for most engines we see a pay-back time of approximately 1-2 years.

The pay-back time can easily be calculated based on the operational conditions of the engine.

MEP regulation is optional, but fully approved and extensively applied for MAN B&W diesel engines.

We suggest that you consider having MEP regulation included in the specification for your newbuildings at an early stage.

The exterior design on the MEP – and the BHP regulation is identical.

The difference lies with the cam, which is produced specifically for each lubricator based on an algorithmic calculation. 

Effect on engines with LCD regulation

MEP proportional regulation may be used with advantage on lubricators fitted with Load Change Dependent regulation as the MEP and LCD systems complement each other.

Please feel free to contact us for further information on MEP regulation.

Read more about BHP Regulation. Click here

Read more about LCD Regulation. Click here

During running-in and prolonged use of MEP regulation, a small wear will occur. Therefore, we recommend that you check the stroke length at appropriate intervals.

Please feel free to contact us for further information on maintenance of MEP regulation.

On this page you can find replies to a number of frequently asked questions on MEP regulation. 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.

  • What is the difference between MEP and BHP regulation?
    • MEP regulation regulates according to the mean effective pressure whereas the BHP regulation regulates according to the engine’s load.

      The design is the same for MEP and BHP regulation.

      The difference lies in the design of the cam, which is produced specifically for each lubricator based on an algorithm calculation.

  • What is the difference between MEP and LCD regulation?
    • MEP regulation is a way to save lube oil while maintaining a safe operational condition during part load. On all engines with timed lubrication an excess of lube oil is used in part load areas. This occurs due to the fact that the engine has a RPM dependent injection and the lube oil consumption is specified as a function: g/BHPh of the engine’s load.

      If you operate in part load areas, the MEP regulation may help to adjust the lube oil consumption to the actual need.

      However, LCD regulation is an automatic joint quantity adjustment increasing the lube oil injection in case of changes in the manoeuvring and loads. This means that the cylinder liner is protected by adding a higher feed rate in short periods when it is needed.

  • Can MEP and LCD regulations be applied together?
    • Yes, MEP and LCD regulations can be used together with great advantage. They serve in their own way to achieve an optimum cylinder lubrication of the engine.

  • The lube oil consumption is too high in rough sea. What can I do?
    • The LCD actuator of the lubricator functions based on signals which it receives from either a governor or from a control box connected to the fuel regulation shaft. At delivery, the signal is set according to the engine designer’s guidelines.

      However, some engines operate under conditions which are different from the average used as basis for the calculation of these guidelines. Therefore, there is also the possibility that you may adjust the settings of the system yourself. We recommend that you consult the relevant material for the control which is used on your engine. In this way, you may perform an adjustment which meets your need for when an increased lubrication is needed.

  • How do I check that the MEP regulation works as intended?
    • This is done easily, even when the engine is not running. However, the following conditions must be met:

          a) It is possible to turn the fuel regulation shaft.
          b) The handle for the fuel regulation shaft is set in position minus (-), or
          c) The LCD actuator is locked with both handles in zero setting.
       

      Subsequently, the stroke length of the lubricator is measured at different levels for the fuel pump index and is compared to the regulation curve in the lubricator manual. If you measure at the fuel pump index from 100% load and downwards, the largest stroke length should be measured at 100% and be reduced gradually until it becomes stable at low load levels.

       

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