Operation Manual / TPL65-A32 / -A33 / -A36 + TPL69-A32 / -A33
Maintenance
5
Cleaning turbine blades and nozzle ring
in operation
5.4
Page 63
Sept
em
be
r 2
014
H
ZT
L24
98_
EN
R
ev
is
ion A
To obtain the correct water flow rate, a certain pressure in the water pipe
is necessary. (See table of Cleaning Parameters). If this water pressure is
too low, the water flow rate specified in the table will not be obtained. In
this case, cleaning will not be so good. An improvement can be achieved
by reducing the load to below 10%.
NOTICE
Repeating cleaning cycles immediately after each other must be
avoided as this can lead to high mechanical loading and consequently
to a reduction in the service life of the components.
If cleaning is unsatisfactory, the length of the process can be extended.
If the injection time is extended, it must be ensured that no
unacceptable volume of water collects in the gas outlet casing. To avoid
this, a drainage system for the gas outlet casing must be installed and
open during the cleaning process. If a drainage system is not provided,
the injected volume of water can be controlled by a flow meter in the
water supply. The maximum volume of water allowed in individual
cases must be determined together with an ABB Turbocharging service
station. The influence of the cleaning water on peripheral equipment,
such as a boiler, must be clarified by the operator.
The following must be observed where drainage of the gas outlet casing is
concerned:
The exhaust gas temperature behind the turbocharger drops
significantly when cleaning (by 50 to 150°C).
Depending on the engine load, water might run out of the drain pipe.
This outflow might not start for 2 or 3 minutes, or it might not occur at
all.
If the gas outlet casing is not drained, the turbocharger speed and / or
the gas inlet temperature must be monitored during the cleaning
process. If the load is too low, water can collect in the gas outlet
casing. Signs of this are a sudden significant drop in turbocharger
speed or a very strong increase in the gas inlet temperature. In such
cases, cleaning must be stopped and the cleaning cycle repeated from
the beginning using a lower water pressure or higher engine load.
Wet cleaning parameters for turbine and nozzle ring
Product
Maximum
temperature at
start of cleaning
process
T
TI
[°C]
Injection time
t
i
[min]
Water flow rate per
turbocharger
with p
Water
= 2 bar
M
W
[l/min]
TPL65-A32/33/36
430
10
13
TPL69-A32/33
18
Recommendation for
water pressure
Points to remember when
cleaning
Table of cleaning
parameters
© Copyright 2014 ABB. All rights reserved.
