ABB Power2 850-M16 - Page 63

Operation Manual / Power2 800-M / 4 Product description
6
Periodic maintenance
Page 31 /
59
© Copyright 2016 ABB. All rights reserved.
HZTL4061_EN
Revision A
September 2016
6.3.3 Wet cleaning of turbine blades and nozzle ring
Cleaning procedure
The individual phases of the turbine cleaning procedure are shown in the following illustration.
Figure 12: Load/time chart
1. Cool down phase
 Reduction of the engine load to the operating point for turbine cleaning and subsequent
maintenance of the holding time according to the specifications in the following table.
Power2
Gas pulse at
the inlet in the
HP stage
[N/m
2
]
Gas pulse at
the inlet in the
LP stage
[N/m
2
]
Engine load
[%]
Max. gas inlet
temperature
when starting
cleaning
[°C]
Holding time at
reduced load
[min]
850
9500 ±2500
3200 ±800
25
430
≥10
Table 10: Operating point for turbine cleaning
NOTICE
Algorithm for the gas pulse
For an optimum cleaning result, the gas pulse adopted when designing the
cleaning process should be set via the control system on the engine side.
The algorithm for the gas pulse is specified in the section Calculation of the
gas pulse [➙ 34]. If this is not possible, the specified engine load point is to
be set as an approximation.
NOTICE
Thermomechanical stress
Due to the thermomechanical stress of the turbine casing, the gas inlet tem-
perature should not exceed the specified maximum temperature before start-
ing cleaning. If this is the case, the engine load is to be lowered until the
permissible temperature is reached.