SL02-398.pdf

MAN B&W Diesel A/S

SL02-398/HRJ

Service Letter

January 2002

Cylinder Oil Dosage

L and K-MC/MC-C Marine Engines

with Alpha Lubricator System

Action Code: WHEN CONVENIENT

Dear Sirs

We refer to our Service Letter SL00-385/HRJ of December 2000, “Cylinder Oil

Dosage, Marine MC-Engines”, and can inform you that extensive service tests of

L and K-MC/MC-C engines equipped with the Alpha Lubricator System have

demonstrated the benefits of reducing the cylinder oil feed rates.

Therefore, we are introducing a further reduction of the cylinder lube oil feed rates for

L and K-MC/MC-C engines equipped with the Alpha Lubricator System, see the

enclosure.

We consider this initial reduction of the feed rate a first step only, as we do consider

the potential for reductions to be significantly higher.

We will introduce further reductions when confirmed by commercial pilot plants in

service.

Questions or comments regarding this SL should be directed to our Dept. 2300.

Yours faithfully

MAN B&W Diesel A/S

Carl-Erik Egeberg Mikael C. Jensen

Encl.

HEAD OFFICE (& Postal address)

Teglholmsgade 41

DK-2450 Copenhagen SV

Telephone: +45 33 85 11 00

Telex: 16592 manbw dk

Telefax: +45 33 85 10 30

E-mail: manbw@manbw.dk

http://www.manbw.dk

DIESEL SERVICE

Teglholmsgade 41

DK-2450 Copenhagen SV

Telephone: +45 33 85 11 00

Telex: 31197 manbw dk

Telefax: +45 33 85 10 49

E-mail: diesel-service@manbw.dk

PRODUCTION

Teglholmsgade 35

DK-2450 Copenhagen SV

Telephone: +45 33 85 11 00

Telex: 19023 manfw dk

Telex: 19042 manfw dk

Telefax: +45 33 85 10 17

E-mail: manufacturing/copenhagen@manbw.dk

FORWARDING

Teglholmsgade 35

DK-2450 Copenhagen SV

Telephone: +45 33 85 11 00

Telex: 19023 manfw dk

Telex: 19042 manfw dk

Telefax: +45 33 85 10 16

MAN B&W Diesel A/S

Denmark

CVR.No.: 39 66 13 14

MAN B&W Diesel A/S

Guiding Cylinder Oil Feed Rates

L and K-MC/MC-C engines with Alpha Lubricators

Basic setting

(ref. to MCR load):

0.8 g/bhph

1.1 g/kWh

Minimum feed rate

(ref. to MCR load):

0.5 g/bhph

0.7 g/kWh

Maximum

recommendable feed rate

during normal operation

(ref. to MCR):

1.2 g/bhph

1.6 g/kWh

Alucoat rings: Basic feed rate +100% / 50%

Non or hard-coated rings: Basic feed rate +100%

Feed rate:

Breaking-in

new liners

and rings

(Initial

running-in):

Alucoat rings: The first 5 hours +100%

Remaining testbed trials +50%

Non or hard-coated rings: +100% for 15 hours

Duration:

Alucoat rings:

Stepwise increase to max. load over 5 hours

Non or hard-coated rings:

Stepwise increase to max. load over 15 hours

Load:

Basic setting +50%, to be reduced in two steps of 25% each

after an interval of 250 hours.

Running-in feed rate,

new liners and rings:

Alucoat rings:

No load restrictions or demands for extra oil

Non or hard-coated rings:

Stepwise load increase to max. load over 5 hours.

Lube oil service feed rate +50% for 24 hrs.

Breaking-in new rings in

already run-in liners:

The “Service feed rate”, i.e. the feed rate between the “Basic

setting” and the “Minimum feed rate”, is to be based on

observations of the actual condition (scavenge port

inspections and overhauling reports). Lowering of the feed

rate may be done in steps of maximum 0.05 g/bhph.

Service feed rate:

All feed rates are based on the MCR load. At part load, the

lubricator dosage may be reduced proportionally to the mean

effective pressure.

Reductions proportional to the load are being practised

successfully on stationary constant speed engines.

Below 25%, a possible further reduction should be effected

proportionally to the engine revolutions.

Service feed rate

at part load:

During starting, manoeuvring and load changes, any possible

regulation in proportion to mean effective pressure or load

should be replaced by rpm-proportional regulation, and the

lubricator set to 125% of the MCR-service feed rate.

Manoeuvring and load

change situations:

2001-11-15 – HRJ 2300

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