ABB HT570346 Operation Manual page 115

Separate receivers
Common air receiver
CAUTION
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Operation Manual / TPL65-A32 / -A33 / -A36 + TPL69-A32 / -A33
Taking out of operation at short notice
Locking the rotor
Further measures and information for operation with blocked rotor for
4-stroke engines
4-stroke engine with one turbocharger
No further measures are necessary. The engine can be operated as a
naturally-aspirated engine according to the engine builder's instructions.
4-stroke engine with several turbochargers
No further measures are necessary on engines with separate air and ex-
haust gas receivers. The engine can be operated as a naturally-aspirated
engine according to the engine builder's instructions.
If the engine is equipped with a common air receiver and separate ex-
haust gas receivers, the bellows at the compressor outlet of the damaged
turbocharger must be removed and the air duct on the engine side must
be closed off. If this is not done, the undamaged turbocharger can race
under no load and run at overspeed.
Depending on the engine turbocharging system, more or less powerful
pulses from the exhaust gas system act on the locked rotor. The locking
device is then heavily stressed, particularly in the case of pulse charging
(turbine casing with more than one gas inlet). With this in mind, the follow-
ing operating limits should not be exceeded:
 In systems similar to those with constant pressure (1 gas inlet), the
engine can be operated up to a maximum of 25% engine load. The
pressure in the charge air receiver must not exceed 0.9 bar overpres-
sure.
 In the case of pulse charging (2...4 gas inlets), the engine can be op-
erated up to a maximum of 20% engine load. The pressure in the
charge air receiver must not exceed 0.5 bar overpressure.
Attention must always be paid to the speed of the undamaged turbo-
charger. The speed limit n
ceeded.
9
9.2
given on the rating plate must not be ex-
Bmax
Page 113