Man L23/30DF, Руководство по проекту

Страница: 177 / 392

Antifreeze agents are generally based on ethylene glycol. A suitable chemical
anticorrosive agent must be added if the concentration of the antifreeze
agent prescribed by the user for a specific application does not provide an
appropriate level of corrosion protection, or if the concentration of antifreeze
agent used is lower due to less stringent frost protection requirements and
does not provide an appropriate level of corrosion protection. Considering
that the antifreeze agents listed in the table Antifreeze agents with slushing
properties also contain corrosion inhibitors and their compatibility with other
anticorrosive agents is generally not given, only pure glycol may be used as
antifreeze agent in such cases.
Simultaneous use of anticorrosive agent from the table
Nitrite-free chemical
additives together with glycol is not permitted, because monitoring the anti-
corrosive agent concentration in this mixture is no more possible.
Antifreeze may only be added after approval by MAN Diesel & Turbo.
Before an antifreeze agent is used, the cooling system must be thoroughly
cleaned.
If the coolant contains emulsifiable slushing oil, antifreeze agent may not be
added as otherwise the emulsion would break up and oil sludge would form
in the cooling system.
Biocides
If you cannot avoid using a biocide because the coolant has been contami-
nated by bacteria, observe the following steps:
▪
You must ensure that the biocide to be used is suitable for the specific
application.
▪
The biocide must be compatible with the sealing materials used in the
coolant system and must not react with these.
▪
The biocide and its decomposition products must not contain corrosion-
promoting components. Biocides whose decomposition products con-
tain chloride or sulphate ions are not permitted.
▪
Biocides that cause foaming of coolant are not permitted.
Prerequisite for effective use of an anticorrosive agent
Clean cooling system
As contamination significantly reduces the effectiveness of the additive, the
tanks, pipes, coolers and other parts outside the engine must be free of rust
and other deposits before the engine is started up for the first time and after
repairs of the pipe system.
The entire system must therefore be cleaned with the engine switched off
using a suitable cleaning agent (see 010.005 Engine – Work Instructions
010.000.001-01 and 010.000.002-04).
Loose solid matter in particular must be removed by flushing the system
thoroughly as otherwise erosion may occur in locations where the flow veloc-
ity is high.
The cleaning agents must not corrode the seals and materials of the cooling
system. In most cases, the supplier of the coolant additive will be able to
carry out this work and, if this is not possible, will at least be able to provide
suitable products to do this. If this work is carried out by the engine operator,
he should use the services of a specialist supplier of cleaning agents. The
cooling system must be flushed thoroughly after cleaning. Once this has
Specification of engine coolant
D010.000.023-13-0001
General
2017-08-18 - de
010.000.023-13
MAN Diesel & Turbo
4 (7) D010.000.023-13-0001 EN