08028-0D\H5250\94.08.12
1609571-3.4
Page 1 (5)
Freshwater System Treatment
B 13 00 0
General
00.11
Cleaning agents emulsified in water as well as
slightly alkaline cleaning agents can be used for the
degreasing process, whereas ready-mixed cleaning
agents which involve the risk of fire must obviously
not be used. For descaling with acid, especially
products based on amino-sulphonic acid, citric acid,
and tartaric acid are recommendable, as these acids
are usually obtainable as solid substances, easily
soluble in water, and do not emit poisonous vapours.
The cleaning agents should not be directly admixed,
but should be dissolved in water and then added to
the cooling water system.
Normally, cleaning can be executed without any
dismantling of the engine. We point out that the water
should be circulated in the engine to achieve the best
possible result.
As cleaning can cause leaks to become apparent in
poorly assembled joints or partly defective gaskets,
inspection should be carried out during the cleaning
process. The acid content of the system oil should
also be checked immediately after cleaning, and 24
hours afterwards.
Cooling Water - Inhibitors
The filling-up with cooling water and the admixture of
the inhibitor is to be carried out directly after the
cleaning in order to prevent formation of rust on the
cleaned surfaces.
Raw Water
The formation of lime stone on cylinder liners and in
cylinder heads may reduce the heat transfer, which
will result in unacceptably high temperatures in the
material.
Therefore, it is recommended that deionized or
distilled water (for example from the freshwater
generator) is used as cooling water. However, on
account of its lack of hardness, this water will be
relatively corrosive, and a corrosion inhibitor should
therefore always be added.
Protection against Corrosion in Freshwater
Cooling System
The engine fresh water
must be carefully treated,
maintained and monitored so as to avoid corrosion
or the formation of deposits which can result in
insufficient heat transfer, it is necessary to treat the
cooling water. MAN B&W recommend that this treat-
ment is carried out according to the following proce-
dure:
–
Clean the cooling water system.
–
Fill up with deionized or distilled cooling water
(for example from the freshwater generator)
with corrosion inhibitor added.
–
Carry out regular checks of the cooling water
system and the condition of the cooling water.
Observance of these precautions, and correct ven-
ting of the system, will reduce service difficulties
caused by the cooling water to a minimum.
Cleaning of the Cooling Water System
Before starting the inhibition process, any existing
deposits of lime or rust, or any oil sludge, should be
removed in order to improve the heat transfer and to
ensure uniform protection of the surface by means of
the inhibitor.
The cleaning should comprise degreasing to remove
oil sludge, and descaling with acid afterwards to
remove rust and lime deposits.
Ready-mixed cleaning agents, specially made for
cleaning the cooling water system, can be obtained
from companies specializing in cooling water treat-
ment. These companies offer assistance and control
of the treatment in all major ports. A number of these
companies are mentioned on the enclosed list. We
point out that the directions given by them should be
closely followed. It is of particular importance to flush
the system completely after cleaning.
Summary of Contents for L28/32H
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Page 5: ...Introduction I 00...
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Page 11: ...Designation of Cylinders In Line 98 19 1607568 0 1 Page 1 1 I 00 15 0...
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Page 19: ...General information D 10...
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Page 37: ...Basic Diesel Engine B 10...
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Page 45: ...99 40 B 10 01 1 L28 32H Cross Section 1607528 5 2 Page 1 1...
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Page 59: ...1607566 7 1 Page 1 1 Engine Rotation Clockwise B 10 11 1 General 98 18...
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Page 61: ...Fuel Oil System B 11...
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Page 79: ...Lubrication Oil System B 12...
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Page 91: ...Cooling Water System B 13...
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Page 113: ...Compressed Air System B 14...
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Page 119: ...Combustion Air System B 15...
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Page 126: ...Fig 1 Jet system 1639456 5 0 Page 2 2 Lambda Controller 93 44 L28 32H B 15 11 1...
Page 127: ...Exhaust Gas System B 16...
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Page 147: ...Speed Control System B 17...
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Page 153: ...Monitoring Equipment B 18...
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Page 159: ...Safety and Control System B 19...
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Page 177: ...Foundation B 20...
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Page 183: ...Test running B 21...
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Page 187: ...Spare Parts E 23...
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Page 191: ...99 35 1607521 2 6 Page 1 1 Recommended Wearing Parts E 23 04 0 L28 32H...
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Page 195: ...Tools P 24...
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Page 203: ...Preservation and Packing B 25...
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Page 211: ...Alternator G 50...
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