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Operation Manual / Power2 550-M / High-pressure stage
7 Periodic maintenance / 7.3 Cleaning the high-pressure stage bellows
(if present)
© Copyright 2022 ABB. All rights reserved.
HZTL4058_EN
Rev.F
March 2022
7.3
Cleaning the high-pressure stage bellows (if
present)
The disassembly and assembly of the bellows (82300) is described in chapter "Disassembly
and assembly".
Fig. 26: Bellows
The following maintenance work must be carried out on the bellows (82300):
u
Remove insulation (if present).
u
Perform a visual inspection for cracks, deposits and corrosion damage.
u
Always replace cracked bellows with a new bellows.
u
If deposits and water residue are present, clean the bellows with water.
u
Perform a visual inspection of the sealing points (flange connection to the compressor
casing and air suction branch).
u
Always replace bellows with a damaged sealing point with a new bellows.
7.4
Cleaning turbines and nozzle rings during
operation
7.4.1
Introduction
The combustion of fuels such as marine diesel oil (MDO) and heavy fuel oil (HFO) in diesel
engines causes contamination of the turbine components of the low and high-pressure
stages. Poor quality fuel in conjunction with a high exhaust gas temperature can lead to very
hard deposits on the nozzle ring, the turbine blades and particularly on the casing walls sur-
rounding the impellers (cover ring Power2 LP or gas outlet flange Power2 HP).
The formation of deposits on the turbine components stems from the following combustion
products:
¡
Soot
¡
Molten ash
¡
Cinders
¡
Incompletely burnt fuel
¡
Sodium vanadyl vanadate
It is advantageous to use fuels with low ash, sulphur, sodium and vanadium contents. The
fuel must also be correctly stored, prepared and handled.
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