Operation Manual / Power2 340-H / High-pressure stage
5 Monitoring during operation / 5.3 Speeds
© Copyright 2022 ABB. All rights reserved. HZTL4054_EN Rev.F March 2022
5.3.3 Differences in speed between the low-pressure or high-
pressure stages
The speeds of the low-pressure stages differ significantly from the speeds of the high-pres-
sure stages.
A Power2 turbocharging system for V-engines, for example, can consist of multiple low-pres-
sure and multiple high-pressure stages. In this case the speeds of the low-pressure stages
only differ a little from each other. The same also applies to the high-pressure stages.
The difference between the highest and the lowest speed must not be more than 3 %, relat-
ive to the speed limit n
Bmax
.
If this permissible range of difference is exceeded, the following steps must be carried out:
u Reduce the engine performance immediately until the maximum speed of all low and
high-pressure stages no longer exceeds 70% of n
Bmax
.
u If the engine cannot be stopped, it can continue to be driven with this reduced engine
performance or at this low-pressure and high-pressure stage speed.
u If a low-pressure or high-pressure stage surges continuously, the engine performance
must be reduced further.
u Measure the temperatures in the air lines and exhaust gas pipes from and to the low-
pressure and high-pressure stages and compare with normal values.
u Check the pressure loss of the alternative air inlet and compare it with normal values.
If the engine can be stopped temporarily:
u Inspect air lines, exhaust gas pipes and the low-pressure and high-pressure stages and
remedy any malfunctions.
u In any case, contacting the nearest Turbo Systems service station is recommended.
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