Summary of the most common cooling water additives
Additive
Advantages
Disadvantages
Sodium
nitrite
- good efficiency, if
dosage is controlled
carefully
- small active quantities,
0.5 % by mass
- cheap
- suitable as additive except
in air cooled heat ex-
changers with large soft
solder
surfaces
-
toxic
- risk of spot corrosion when
too low concentration
Nitrite
+
borate
- no increased risk of
corrosion
at over doses
- innocuous for the skin
- tendency to attack zinc
coverings and soft solde-
rings
-
toxic:
lethal dosage 3 - 4 g
solid nitrite
- risk of spot corrosion when
too
low
concentration
Sodium
silicate
- not toxic
- harmless to handle
- not active when water
velocity exceeds 2 m/s
- commercial products very
expensive
- increased risk of corrosion
when too low concen-
tration;
spot
corrosion
- limited suitability
Sodium
molybdate
- not toxic
- harmless to handle
- more expensive than toxic
additives
- increased risk of corrosion,
if unsufficently dosed
- can cause deposit
formation
(molybdates can collect to
ferrous
sulphates)
Organic
and inor-
canic syn-
ergistic
based
- not toxic
- more expensive than
sodium
nitrite and molybdate
based
additives
- big active quantitives by
mass
Fuel, Lubricating Oil, Cooling Water
200549-01
02 - 22
W20/W32/W46, W46F, 32, 32LN
Summary of Contents for PAAE051728
Page 4: ......
Page 18: ...Appendix B Welding Precautions 200640 00 6...
Page 26: ...01 Main Data Operating Data and General Design 32 200634 01 01 8 W RTSIL 32...
Page 60: ...Appendix A Environmental Hazards 200507 02A 10...
Page 68: ...Page 7 7 Document No 4V92A0645 Rev j...
Page 84: ...03 Start Stop and Operation 32 200402 04 03 12 W RTSIL 32...
Page 98: ...04 Maintenance Schedule 32 200623 01 04 14 W RTSIL 32...
Page 154: ...07 Tightening Torques and Use of Hydraulic Tools 32 200643 01 07 30 W RTSIL 32...
Page 162: ...08 Operating Troubles Emergency Operation 32 200402 01 08 8 W RTSIL 32...
Page 164: ...Specific Installation Data 2005 01 09 2...
Page 178: ...10 Engine Block with Bearings Oil Sump and Cylinder Liner 32 200150 10 14 W RTSIL 32 34SG...
Page 216: ...Appendix A Testing of cylinder tightness 32 200142 A 4 W rtsil 20 32 34...
Page 226: ...13 Camshaft Driving Gear 32 200546 02 13 10 W RTSIL 32...
Page 254: ...15 Turbocharging and Air Cooling 32 200549 10 15 20 W RTSIL 32...
Page 274: ...16 Injection System 32 200627 01 16 20 W RTSIL 32...
Page 280: ...Fuel System 32 200508 07 17 6 W RTSIL 32...
Page 314: ...19 Cooling Water System 32 200050 19 14 W RTSIL 32...
Page 394: ...23 Instrumentation and Automation 32 200115 II 23 60 W RTSIL 32...