Man L23/30DF, Project Manual

Page: 176 / 392

Additives for coolants
Only the additives approved by MAN Diesel & Turbo and listed in the tables
under the paragraph entitled Permissible cooling water additives may be
used.
A coolant additive may only be permitted for use if tested and approved as
per the latest directives of the ICE Research Association (FVV) “Suitability test
of internal combustion engine cooling fluid additives.” The test report must
be obtainable on request. The relevant tests can be carried out on request in
Germany at the staatliche Materialprüfanstalt (Federal Institute for Materials
Research and Testing), Abteilung Oberflächentechnik (Surface Technology
Division), Grafenstraße 2 in D-64283 Darmstadt.
Once the coolant additive has been tested by the FVV, the engine must be
tested in a second step before the final approval is granted.
Additives may only be used in closed circuits where no significant consump-
tion occurs, apart from leaks or evaporation losses. Observe the applicable
environmental protection regulations when disposing of coolant containing
additives. For more information, consult the additive supplier.
Chemical additives
Sodium nitrite and sodium borate based additives etc. have a proven track
record. Galvanised iron pipes or zinc sacrificial anodes must not be used in
cooling systems. This corrosion protection is not required due to the prescri-
bed coolant treatment and electrochemical potential reversal that may occur
due to the coolant temperatures which are usual in engines nowadays. If
necessary, the pipes must be deplated.
Slushing oil
This additive is an emulsifiable mineral oil with additives for corrosion protec-
tion. A thin protective film of oil forms on the walls of the cooling system. This
prevents corrosion without interfering with heat transfer, and also prevents
limescale deposits on the walls of the cooling system.
Emulsifiable corrosion protection oils have lost importance. For reasons of
environmental protection and due to occasional stability problems with emul-
sions, oil emulsions are scarcely used nowadays.
It is not permissible to use corrosion protection oils in the cooling water cir-
cuit of MAN Diesel & Turbo engines.
Antifreeze agents
If temperatures below the freezing point of water in the engine cannot be
excluded, an antifreeze agent that also prevents corrosion must be added to
the cooling system or corresponding parts. Otherwise, the entire system
must be heated.
Sufficient corrosion protection can be provided by adding the products listed
in the table entitled Antifreeze agent with slushing properties (Military specifi-
cation: Federal Armed Forces Sy-7025), while observing the prescribed mini-
mum concentration. This concentration prevents freezing at temperatures
down to –22 °C and provides sufficient corrosion protection. However, the
quantity of antifreeze agent actually required always depends on the lowest
temperatures that are to be expected at the place of use.
Required release
In closed circuits only
2017-08-18 - de
Specification of engine coolant
D010.000.023-13-0001
General
MAN Diesel & Turbo
010.000.023-13
D010.000.023-13-0001 EN 3 (7)