2007-10-22
Observations Temporary stop of surging: Check of engine performance: Investigations of surging T/C: Corrective actions:
See Chapter 706 (See notes below) (See Chapter 706)
START Clean the turbine, 706 Check that the exh.
T/C
Y
Record: speed receiver is free from loose parts, that the
A), B)
protecting grating to the turbine is free for
- Engine load
passage and that the compensators are OK.
N
- Engine speed
- Open one exhaust by-pass valve
- T/C speed
(if installed), or
Y
- reduce engine load, or - P
max
surging Y
t - t
bic aic
- open the relief valve on the scav. air
at constant - P
comp C)
receiver, until surgigng just stops *)
load?
- P (if possible)
i
N
Clean the air cooler, 706
N - t
exhv
- t
btc
Y
Dą
pc
- Open one exhaust by-pass valve (if
- t Check for:
atc
C)
installed), or
- Fuel pump / valve failure
- p
atc
- open the relief valve on the scav. air
Y
N
surging
- Low fuel oil pressures, 701
receiver, or
- Dą
pc
while run-
- Low fuel oil temp., 701
- start the aux. blowers, if possible, to 'help'
ning up?
- Dą - Back press, valve failure in return pipe
pt P
max
Y
the charger pass the critical point until
P P - Exhaust valve failure
comp 1
- t
coolout
N surgigng just stops *)
t
exhv
- Liner/ ring failure
- t D)
scav
Repair if possible
N
- p
scav
- p
If possible: exhrec
Y
surging
Y
P
Check that the gas passage from turbine to
- Stabilise the engine load exhrec
at fluctuating
- Adjust the load funnel is free
C)
load?
- Switch over to index regulation
N
N
Check the water supply to the cooler(s)
NOTES:
Y
Dąt
water
C)
A)Deviating from normal
Y
surging Clean or renew the filter
N
B)Deviating from the other T/C's
while running Reduce the engine load more slowly
C)Higher than normal
down?
D)Abnormal or deviating from the
Y
t
other cyl. scav
Check that the scav. ports are free from
Has
C) coke, that silencer conditions is OK and that
Y
surging
the air passage in the air duct is free, if the
END
N
stopped?
vessel has direct air intake
N Y
*) Note: The exhaust temperatures must Dą
pl
not be allowed to exceed the
C)
If surging has not stopped: Inspect the
limiting values, see Chapter 701
N
turbocharger turbine, cover ring, nozzle ring,
compressor and diffusor, as described in the
T/C manual
Drawing
Turbocharger Surging
6655-0225-0001.0
MAN Diesel
Doc-ID: 6655-0225-0001.0
6655-0225-0001.0
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