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MAN B&W ME/ME C/ME GI/ME-B engines

Bearing Wear Monitoring System

The Bearing Wear Monitoring (BWM) system monitors all three principal crank-train bearings using two proximity sensors forward/aft per cylinder unit and placed inside the frame box.

Targeting the guide shoe bottom ends continuously, the sensors measure the distance to the crosshead in Bottom Dead Center (BDC). Signals are computed and digitally presented to computer hardware, from which a useable and easily interpretable interface is presented to the user.

The measuring precision is more than adequate to obtain an alarm well before steel-to-steel contact in the bearings occur. Also the long-term stability of the measurements has shown to be excellent.

In fact, BWM is expected to provide long-term wear data at better precision and reliability than the manual vertical clearance measurements normally performed by the crew during regular service checks.

For the above reasons, we consider unscheduled open-up inspections of the crank-train bearings to be superfluous, given BWM has been installed.

Two BWM ‘high wear’ alarm levels including deviation alarm apply. The first level of the high wear / deviation alarm is indicated in the alarm panel only while the second level also activates a slow down.

The Extent of Delivery lists four Bearing Wear Monitoring options of which the two systems from Dr. E. Horn and Kongsberg Maritime could also include Bearing Temperature Monitoring:

ME, ME-C and ME-GI engines are as standard specified with Bearing Wear Monitoring for which any of the above mentioned options could be chosen.

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Water In Oil Monitoring System

In case the lubricating oil becomes contaminated with an amount of water exceeding our limit of 0.2% (0.5% for short periods), acute corrosive wear of the crosshead bearing overlayer may occur. The higher the water content, the faster the wear rate.

To prevent water from accumulating in the lube oil and, thereby, causing damage to the bearings, the oil should be monitored manually or automatically by means of a Water In Oil (WIO) monitoring system connected to the engine alarm and monitoring system. In case of water contamination the source should be found and the equipment inspected and repaired accordingly.

The WIO system should trigger an alarm when the water content exceeds 0.3%, and preferably again when exceeding 0.5% measured as absolute water content.

Some WIO systems measure water activity, ie the relative availability of water in a substance expressed in aw on a scale from 0 to 1. Here, ‘0’ indicates oil totally free of water and ‘1’ oil fully saturated by water. The correlation to absolute water content in normal running as well as alarm condition is as follows:

ME, ME-C and ME-GI engines are as standard specified with Water In Oil monitoring system.

Please note: Corrosion of the overlayer is a potential problem only for crosshead bearings, because only crosshead bearings are designed with an overlayer. Main and crankpin bearings may also suffer irreparable damage from water contamination, but the damage mechanism would be different and not as acute.

MAN B&W ME/ME C/ME GI engines

MAN B&W ME/ME C/ME GI engines

MAN B&W ME/ME C/ME GI/ME-B engines

Identification of Instruments

The instruments and sensors are identified by a position number which is made up of a combination of letters and an identification number:

Measured variables

First letters:

Location of measuring point

Ident. number:

11xx Manoeuvring system

12xx Hydraulic power supply system 14xx Combustion pressure supervision 20xx ECS to/from safety system

21xx ECS to/from remote control system 22xx ECS to/from alarm system

30xx ECS miscellaneous input/output 40xx Tacho/crankshaft position system 41xx Engine cylinder components 50xx VOC, supply system

51xx VOC, sealing oil system 52xx VOC, control oil system 53xx VOC, other related systems

Table 18.07.01: Identification of instruments

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54xx VOC, engine related components 80xx Fuel oil system

81xx Lubricating oil system 82xx Cylinder lube oil system 83xx Stuffing box drain system 84xx Cooling water systems 85xx Compressed air systems 86xx Scavenge air system 87xx Exhaust gas system 88xx Miscellaneous functions 90xx Project specific functions

xxxx A Alternative redundant sensors xxxx 1 Cylinder/turbocharger numbers

ECS: Engine Control System

VOC: Volatile Organic Compound

Functions

Secondary letters:

AAlarm

CControl

HHigh

IIndication

LLow

RRecording

SSwitching

X Unclassified function

Y Slow down

ZShut down

Repeated signals

Signals which are repeated for example for each cylinder or turbocharger are provided with a suffix number indicating the location, ‘1’ for cylinder 1, etc.

If redundant sensors are applied for the same measuring point, the suffix is a letter: A, B, C, etc.

Examples:

 TI 8005 indicates a local temperature indication (ther-

mometer) in the fuel oil system.

 ZS 1112 A C and ZS 1112 B C indicate that there are

two position switches in the manoeuvring system, A and B for control of the main starting air valve position.

PT 8501 I AL Y  indicates a pressure transmitter locat-

ed in the control air supply for remote indication, alarm for low pressure and slow down for low pressure.

MAN B&W MC/MC-C, ME/ME C/ME GI/ME-B engines

Painting of Main Engine

The painting specification, Section 19.02, indicates the minimum requirements regarding the quality and the dry film thickness of the coats of, as well as the standard colours applied on MAN B&W engines built in accordance with the ‘Copenhagen’ standard.

Paints according to builder’s standard may be used provided they at least fulfil the requirements stated.

Dispatch Pattern

The dispatch patterns are divided into two classes, see Section 19.03:

A:Short distance transportation and short term storage

B:Overseas or long distance transportation or long term storage.

Short distance transportation (A) is limited by a duration of a few days from delivery ex works until installation, or a distance of approximately 1,000 km and short term storage.

The duration from engine delivery until installation must not exceed 8 weeks.

Dismantling of the engine is limited as much as possible.

Overseas or long distance transportation or long term storage require a class B dispatch pattern.

The duration from engine delivery until installation is assumed to be between 8 weeks and maximum 6 months.

Dismantling is effected to a certain degree with the aim of reducing the transportation volume of the individual units to a suitable extent.

Note:

Long term preservation and seaworthy packing are always to be used for class B.

Furthermore, the dispatch patterns are divided into several degrees of dismantling in which ‘1’ comprises the complete or almost complete engine. Other degrees of dismantling can be agreed upon in each case.

When determining the degree of dismantling, consideration should be given to the lifting capacities and number of crane hooks available at the engine maker and, in particular, at the yard (purchaser).

The approximate masses of the sections appear in Section 19.04. The masses can vary up to 10% depending on the design and options chosen.

Lifting tools and lifting instructions are required for all levels of dispatch pattern. The lifting tools (4 12 110 or 4 12 111), are to be specified when ordering and it should be agreed whether the tools are to be returned to the engine maker (4 12 120) or not (4 12 121).

MAN Diesel’s recommendations for preservation of disassembled/ assembled engines are available on request.

Furthermore, it must be considered whether a drying machine, option 4 12 601, is to be installed during the transportation and/or storage period.

Shop trials/Delivery Test

Before leaving the engine maker’s works, the engine is to be carefully tested on diesel oil in the presence of representatives of the yard, the shipowner and the classification society.

The shop trial test is to be carried out in accordance with the requirements of the relevant classification society, however a minimum as stated in Section 19.05.

MAN B&W ME/ME-B/ME C/ME GI engines

MAN Diesel’s recommendations for shop trial, quay trial and sea trial are available on request.

An additional test is required for measuring the NOx emissions, for plants with FPP or CPP, EoD 4 06 060a or 4 06 060b respectively.

Spare Parts

List of spares, unrestricted service

The tendency today is for the classification societies to change their rules such that required spare parts are changed into recommended spare parts.

MAN Diesel, however, has decided to keep a set of spare parts included in the basic extent of delivery (4 87 601 and 4 87 602) covering the requirements and recommendations of the major classification societies, see Section 19.06.

This amount is to be considered as minimum safety stock for emergency situations.

Additional spare parts recommended by MAN Diesel

The above mentioned set of spare parts can be extended with the ‘Additional Spare Parts Recommended by MAN Diesel’ (option: 4 87 603), which facilitates maintenance because, in that case, all the components such as gaskets, sealings, etc. required for an overhaul will be readily available, see Section 19.07.

Wearing parts

The consumable spare parts for a certain period are not included in the above mentioned sets, but can be ordered for the first 1, 2, up to 10 years’ service of a new engine (option: 4 87 629), a service year being assumed to be 6,000 running hours.

The wearing parts supposed to be required, based on our service experience, are divided into 14 groups, see Table A in Section 19.08, each group including the components stated in Tables B.

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Large spare parts, dimensions and masses

The approximate dimensions and masses of the larger spare parts are indicated in Section 19.09. A complete list will be delivered by the engine maker.

Tools

List of standard tools

The engine is delivered with the necessary special tools for overhauling purposes. The extent, dimensions and masses of the main tools is stated in Section 19.10. A complete list will be delivered by the engine maker.

Tool Panels

Most of the tools are arranged on steel plate panels (EoD 4 88 660) see Section 19.11 ‘Tool Panels’.

It is recommended to place the panels close to the location where the overhaul is to be carried out.

MAN B&W ME/ME-B/ME C/ME GI engines