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Countermeasure For Surging

1) The document provides countermeasures for turbocharger surging in diesel engines. Surging can be caused by nozzle vane deformation, efficiency declines over time, and contamination in exhaust and scavenging passages. 2) When surging occurs, examinations should be conducted of the turbocharger nozzle ring condition, turbine blades, blower vanes, and clearances for contamination, damage, and wear. The engine's air and fuel lines and load conditions should also be examined. 3) Periodic cleaning of the turbocharger is recommended to prevent carbon accumulation that can cause surging, with different cleaning intervals recommended for the turbine and blower sides. Specification modifications may also help if surging

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581 views3 pages

Countermeasure For Surging

1) The document provides countermeasures for turbocharger surging in diesel engines. Surging can be caused by nozzle vane deformation, efficiency declines over time, and contamination in exhaust and scavenging passages. 2) When surging occurs, examinations should be conducted of the turbocharger nozzle ring condition, turbine blades, blower vanes, and clearances for contamination, damage, and wear. The engine's air and fuel lines and load conditions should also be examined. 3) Periodic cleaning of the turbocharger is recommended to prevent carbon accumulation that can cause surging, with different cleaning intervals recommended for the turbine and blower sides. Specification modifications may also help if surging

Uploaded by

Parthiban Nagarajan
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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TECHNO NEWS

MES TECHNOSERVICE CO., LTD. TECHNICAL DEPARTMENT / DIESEL PRODUCT GROUP

Countermeasure for turbocharger surging

No.013
SECTION CHIEF ASSIST CHIEF STAFF K. Higasa

H. Miyake 2001/1/28

ENGINE TYPE

All type of turbochargers

DATE

The turbocharger surging is sometimes reported in using the engine comparatively long term. There are some factors which cause this surging such as nozzle vane deformation, efficiency decline with time, resistance increase by contamination in exhaust and scavenging passage. Please carry out the examination of the following items first of all when surging occurred. 1, Examination of the Turbocharger Nozzle-ring condition (1) Contamination. (especially, care must be paid to carbon deposit on gas pressure side at nozzle-ring vanes.) (2) Deformation of nozzle vanes. (3) Chip off / crack of nozzle vanes. Turbine blade condition (1) Contamination. (2) Worn away at the blade tip. (3) Chip off / crack of blades. Blower condition (1) Contamination. (2) Chip off / crack of vanes.

Example of nozzle vane deformation. Vane deformation can not be recognized at first glance, however, actually nozzle area is reduced 12% by deformation. Hence, close inspection is required.

Clearance (1) Clearance between blade and cover-ring (turbine diffuser). (2) Exhaust temperature differences between gas inlet and outlet.

PRIORITY IMMEDIATELY
ADDRESS

EARLIEST CHANCE

DRY DOCK

1-1, Tama 3-Chome, Tamano, Okayama Japan


TEL/FAX

0863-23-2385 / 0863-23-2349
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2, Examination of the Main engine Air line (1) Contamination of air-cooler (pressure difference of the air-cooler). (2) Contamination or clog up of mist catcher, drainage status and clog up of drain line. (3) Function of non-return valve located inside of scavenging manifold. (for auxiliary blower and flap valve ) (4) Scavenging air pressure and temperature. (5) Intake air temperature. Exhaust line (1) Clog up at protecting grid before the turbocharger. (2) Abnormal contamination at exhaust passage. (3) Contamination at exhaust economizer. (4) Back pressure of the turbocharger. Fuel oil line (1) Fuel oil specification. (viscosity at fuel pump inlet) (2) Un-uniform combustion among cylinders. (fuel pump / suction valve / fuel valve condition and camshaft timing) Engine load condition (1) Whether load condition is in torque-rich or not. (contamination of hull or propeller) We can comply main engine performance analysis, therefore, please send us the engine data before and after surging occurrence. 3, Others In low load operation (50-60% load), carbonized deposit can be made easier than normal load operation, therefore, lots of carbon deposit accumulate onto the nozzle-ring vanes. In case of planning the low load operation at less than 75% load for long term, we recommend adopting slow steaming atomizer to improve fuel combustion performance. For low load operation, detail is described on Service Note No.103[Low load operation]. Periodical cleaning for the turbocharger is recommended to avoid surging problem caused by carbon accumulation, and, interval for cleaning is as follows.

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[Turbine side]

Water washing Dry washing

: every 250hrs. : every 25-50hrs.

* CAUTION

--- For MET turbochargers, dry washing is established as standard, however, water washing is not recommendable.

[Blower side]

Water washing : depends on contamination

[if it is equipped] Also,

Never use chipping hammers or needle hammers when cleaning the nozzle-ring. sandblast should be avoided to prevent the deformation of the nozzle vanes.

Concerning clearance for the turbocharger, detail is described on Techno News No.006.

If surging problem could not be eliminated though above mentioned items are attempted, it is possible to improve the condition by increasing surging margin by spec modification. We have experiences that could solve the surging by spec modification. However, please ask our local sales office, since an examination in advance is necessary by engine builder.

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