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Emergency operation
Wärtsilä NSD Nederland B.V. Engine type W26 Chapter 1.5 Subject
Issue date Exhaust gas/Charge air system June '00
Emergency operation
NA295 Emergency operation. The following procedure can be used:
Remove the cartridge and place to one side. Cut out a large round plate to Ø 640mm with 12 holes drilled to Ø 12mm equispaced on
PCD 558. Fit plate to the main casing side of the turbine outlet casing ensuring that the integrated oil feed 'O' rings are fitted, to block off the oil supply. Using this method will mean that the receiver to the air cooler is just an open pipe and must be covered with gauze to prevent large particles entering the engine.
Alternatively the method described in the manual is just as effective, but it does involve a greater amount of work to strip and rebuild the turbocharger.
NA297 Emergency operation
lf a defect occurs which prevents further operation of the turbocharger, the engine may still be run for a short period provided that the rotor assembly is removed and the exposed centre casing apertures are blanked off, as shown in figure below. Coolant flow to the turbine casings must be continued during this emergency running.
For guidance the following blanking plate details are given in figure below.
Note: Permissible engine output with blocked turbocharger is approx. 20% load. Engine output must, however, be limited not to exceed the normal full load exhaust temperatures. Maximum permissible exhaust gas tempera-ture after the cylinder at continuous operation with blocked turbocharger is 500ºC.
