ELC types of coolants should not be mixed with Standard Life Coolants. If an ELC
coolant and SLC coolant are mixed, the long-life advantages of the ELC coolant
will be lost. In this event, the coolant should be re-inhibited with OAT inhibitors
and confirmed by analysis or else it must be maintained as an SLC coolant.
Standard Life Coolants
Standard Life Coolants (SLC) contains inhibitor salts, including nitrites, to prevent
liner cavitation. These coolants require interval testing to maintain inhibitor
concentration.
SLC antifreeze coolants are commercially available from Detroit™ service outlets
and other manufacturers as either concentrated or as pre-mixed coolant.
Concentrated coolants should be mixed at 50% (50% coolant/50% water). All fully
formulated coolants used must also meet DFS 93K217 specification.
Water Requirements
Distilled or de-ionized water is preferred as it is absent the adverse effects caused
by tap water minerals. High levels of dissolved chlorides, sulfates, magnesium, and
calcium found in some tap water causes scale deposits, sludge deposits and/or
corrosion. These deposits have been shown to cause component failures and poor
heat transfer, resulting in overheating. If tap water is used, the mineral content in
the water must be below the maximum concentration listed in the table below.
Table 6.
Maximum Mineral Concentration in Water
Minerals
Maximum Concentration
Parts per Million
Grains per Gallon
Chlorides
40
2.5
Sulfates
100
5.8
Total Dissolved Solids
340
20
Mag Calcium
Content
170
10
Recycled Coolants
Antifreeze coolants made with ethylene or propylene glycol, recycled by reverse
osmosis, distillation, and ion exchange and properly re-inhibited to meet ASTM
D6471 or D6472 requirements have been demonstrated to provide service
equivalent to non-recycled coolants. Recycled coolants of these types are preferred.
However, suppliers of these recycled glycols must provide evidence the product is
free of the contaminates listed below:
• Acetates
Gen 5 DD Platform Operators Manual
All information subject to change without notice.
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DDC-SVC-MAN-0217
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