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Turbocharger cutting-off procedures:


» When it is necessary to cut-off T/C due to heavy vibration, bearing failure, etc. cutting 
procedure should be done as per engine maker’s instruction. 
» Cutting-off operation depends on number of T/C installed and number of T/C damaged. 
Following procedures are in accordance with Sulzer RT engine practice: 
Case I: Failure of one T/C, with Exhaust by-pass piping:
Lock rotor as per T/C manual. 
Remove blank flange in by-pass exhaust piping.
Open covers of scavenge air trunk. 
Auxiliary blowers must be running during operation. 
If casing is cracked, stop T/C cooling. 
If T/C is supplied with external lubrication, shut L.O. supply. 
 Output 25%: RPM 60% at MCR. 
Case II: Failure of one T/C, of two T/C engine:
Lock rotor of damaged T/C. 
Remove expansion joints of both exhaust inlet and air outlet of damaged T/C, 
and put blank flanges. 
If casing is cracked, stop T/C cooling. 
If T/C is supplied with external lubrication shut L.O. supply. 
 Output 50%: RPM 80% : Running T/C rpm must not exceed normal rpm: 
Case III: Failure of all T/C of an engine, without Exhaust by-pass piping:
Lock rotors of all T/Cs. 
Open all covers of scavenge air trunk. 
Auxiliary blowers must be running during operation. 
If casing is cracked, stop T/C cooling. 
If T/C is supplied with external lubrication shut L.O. supply. 
 Output 15%: RPM 50%:

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