Hans Jensen Lubricators A/S - 100 years

BHP Regulation

Why choose BHP Regulation

As opposed to HJ Mechtronic, which is an electronic regulation, a BHP regulation is a mechanical regulation that can be retrofitted on mechanical lubricators. It has the same advantages in the possibility of making lubrication load dependent, and thus also reductions in oil consumption and improved cylinder conditions, as well as a reduced risk of over lubrication. Also BHP regulation is very suitable for slow steaming.

Background

On engines with timed cylinder lubrication, i.e. where the cylinder lubrication is directly rpm dependent, the consumption of cylinder lube oil in the part load area is normally higher than necessary. With the BHP regulation it is possible to adjust the cylinder lube oil consumption according to the actual engine load. This entails a reduction in the cylinder lube oil consumption and thereby the operation costs. 

Functionality

The BHP regulation takes place by means of a mechanical joint connection from the fuel regulation shaft to the BHP regulation cover, whereby the cylinder lube oil is adjusted proportionally to the engine load. In order not to “starve” the cylinder of cylinder lube oil at small loads and low rpm, the BHP dependent regulation is not carried out during operation in the very small part load areas. 

Installation

The BHP regulation cover is mounted directly on top of the cylinder lubricator. Therefore, it is possible to install BHP regulation on an existing HJ mechanical cylinder lubricator and on newbuildings. The basic design of the MEP and the BHP regulation covers is the same. The difference between the two types of regulation lies in the design of the cam, which is determined by a plant specific algorithm.
 
Please feel free to contact us for further information on BHP regulation.
 
Read more about MEP regulation. Click here
 
Read more about HJ Mechanical Cylinder Lubricator. Click here

Purpose

The BHP regulation is intended for engines with timed cylinder lubrication, i.e. where the cylinder lubricator drive is dependent on the engine rpm. In such situations, the cylinder lube oil consumption in part load areas is usually higher than necessary.
 
With the BHP regulation it is possible to create a cylinder lubrication which is adjusted according to the engine load, and thereby savings in the cylinder lube oil consumption can be obtained. Furthermore, a reduction in the cylinder lube oil consumption entails cleaner lubrication and exhaust, which reduces the risk of scavenge fires. 

Design

The BHP regulation cover is mounted on top of the cylinder lubricator (1) and is connected to the fuel regulation shaft (5) by a pressure rod (3).
 
This means that the cam (8) of the BHP regulation moves proportionally to the movements of the fuel regulation shaft (5).
 
On the cam lies a cam follower (9), which is moving according to the design of the cam.
 
The cam follower is, through a shaft (10), connected to a series of arms which each activate an adjusting bolt and thereby adjust the stroke length on the cylinder lubricator. 

Savings

If conventional rpm dependent cylinder lubricators are applied on FPP engines, the cylinder lube oil consumption will be proportional to the engine rpm, see above figure 1.
 
On constant speed engines (CPP or stationary plants), the cylinder lube oil consumption is also constant, irrespective of the engine load, see above figure 2. On engines with variable rpm and CPP the two above mentioned principles are combined.
 
In all these cases, large amounts of cylinder lube oil can be saved by applying BHP proportional regulation.
 
The outer design of the MEP and the BHP regulation is the same. The difference lies in the design of the cam.
 
The cam is produced specifically for each plant based on an algorithm calculation. 

Effect on engines with LCD regulation

BHP proportional regulation can with advantage be applied on cylinder lubricators equipped with Load Change Dependent regulation, as the BHP and the LCD systems complement each other.
 
You are welcome to contact us for further information on BHP regulation.
 
Read more about MEP regulation. Click here
 
Read more about LCD regulation. Click here
During running-in and long operation of the BHP regulation small wear will appear. Therefore, check the stroke length at suitable intervals.

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

On this page you can find replies to a number of frequently asked questions on BHP Regulation. If you find the replies 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 the MEP and the BHP regulation?
    • The MEP regulation adjusts the consumption according to the mean effective pressure, whereas the BHP regulation adjusts according to the engine load. The design of the MEP and the BHP regulation is the same. The difference lies in the design of the cam which is produced specifically for each plant based on an algorithm calculation.

  • What is the difference between the BHP and the LCD regulation?
    • The BHP regulation is a means to save cylinder lube oil and at the same time maintain a safe operation condition during part load. On all engines with timed cylinder lubrication, too much cylinder lube oil is applied in the part load area. This happens because the engine has an rpm dependent injection and the cylinder lube oil consumption has been specified as a function: g/BHPh of the engine load.

      When operating in part load areas, the BHP regulation can help adjust the cylinder lube oil consumption to the actual need.

      The LCD regulation, on the other hand, is an automatic joint quantity adjustment, which increases the cylinder lube oil injection in case of manoeuvres and load changes. This means that the cylinder liner is protected by supply of cylinder lube oil at a higher feedrate during the short periods, where this is necessary.

  • Can the BHP and the LCD regulations be applied together?
    • Yes, the BHP and the LCD regulations can with advantage be applied together. Each in their own way contributes to obtain an optimal cylinder lubrication on the engine.

  • The cylinder lube oil consumption is too large in rough sea. What can I do?
    • The LCD actuator on the cylinder lubricator works on basis of signals received either from a governor or a control box connected to the fuel regulation shaft. At delivery, the signal is adjusted according to the engine designer’s guide lines.

      However, some engines operate under conditions which are different from the average applied as basis for the calculation of these guide lines. Therefore, it is also possible to adjust the settings of the system individually.  We recommend you to consult the relevant material for the control applied on your engine. In this way you can adjust the settings so they meet your requirements as to when increased extra lubrication is advisable.

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

          a) The fuel regulation shaft can be turned

          b) The handle for joint quantity adjustment is set to position minus (-), or

          c) The LCD- actuator is locked with both handles in 0-position

      Then measure the stroke length on the cylinder lubricator at different fuel pump index levels and compare to the regulation curve in the cylinder lubricator manual. If you measure at fuel pump indexes from 100% load and downwards, the largest stroke length must be measured at 100% and gradually reduced until it becomes stable at low load levels.

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