while the engine is running at reduced power, by a combination
of scouring action and partial dissolving of the deposits.
Under no circumstances the turbine should be allowed to run
long enough to become very heavily coated with deposits.
A fouled turbine can be recognized by abnormal exhaust gas
tem-perature, charger speed and charge air pressure. In some
case it can lead to compressor surging. The bearings of the
turbocharger are also sensitive to the imbalance caused by the
deposits.
The water supply is conveyed to an injector (1) with fixed size
orifice, fitted into each branch of the engine exhaust gas pipe.
Turbochargers, which have one gas inlet, are provided with two
injectors on the same pipe. The injectors are connected to a
quick-coupling (2).
15.1.3.2 Cleaning intervals
The optimum period between cleaning operations will obviously
vary from one installation to another, and will depend on the type
of fuel used as well as on running conditions. Under "average"
conditions, with engines running on residual fuels, experience
shows that cleaning intervals of about 200 hours are satisfactory.
15.1.3.3 Water flow rates
The necessary water flow is basically dependent on the volume of
gas and its temperature. The flow should be adjusted so that about
50 to 70% of the water is evaporated and escapes through the
exhaust gases, while the remaining water is drained through the
tap in the exhaust casing.
Recommended water flow rates:
Water cleaning of turbine
Turbocharger size
∆
p (bar)
Water flow (l/min)
VTR 161
1
2.0 - 3.0
VTR 201
1
3.0 - 4.5
VTR 251
1
4.5-7
Additives or solvents must not be used in the cleaning water. The
use of salt water is out of question.
15.1.3.4 Cleaning procedure:
1 Record blower charge air pressure,
cylinder exhaust
gas tem-peratures, charger speed, for later use to assess effi-
cacy of cleaning.
22-8604
Turbocharging and Air Cooling
15/III
VTR 161-251 Turbochargers
15 - 3
Summary of Contents for Vasa R22
Page 14: ...Appendix B Welding Precautions 200147 00 4...
Page 42: ...02 Fuel Lubricating Oil Cooling Water 22 9601 02 22 VASA 22...
Page 60: ...03 Start Stop and Operation 22 9632 03 12 VASA 22...
Page 72: ...04 Maintenance Schedule 22 9845 III 04 12 MD HF...
Page 92: ...06 II Adjustments Clearances and Wear limits 22 9601 06 6 VASA 22...
Page 116: ...08 Operating Troubles Emergency Operation 22 9601 08 8 VASA 22...
Page 144: ...11 Crank Mechanism 22 9601 11 18 VASA 22...
Page 156: ...12 Cylinder Head with Valves 22 9601 12 12 VASA 22...
Page 164: ...13 Camshaft Driving Gear 22 9601 13 8 VASA 22...
Page 172: ...14 Valve Mechanism and Camshaft 22 9601 14 8 VASA 22...
Page 183: ...22 200520 Turbocharging and Air Cooling 15 VTR Turbocharger 15 11...
Page 189: ...15 III Turbocharging and Air Cooling 22 8604 15 6 VTR 161 251 Turbochargers...
Page 209: ...17 Fuel system 22 9601 17 8 VASA 22...
Page 229: ...18 Lubricating Oil System 22 9601 18 20 VASA 22...
Page 247: ...19 Cooling Water System 22 9601 19 18 VASA 22...
Page 261: ...21 Starting Air System 22 9601 21 10 VASA 22...