Assembly Instructions / Power2 500-M
4 Installing the low-pressure stage / 4.2 Steps for fastening the low-
pressure stage
© Copyright 2020 ABB. All rights reserved. HZTL455311P0009_EN Rev.A July 2020
4.2.3 Two-piece foot
Foot contact surfaces
If the low-pressure stage has a two-piece foot, this consists of the foot at the turbine end
(TE) and the foot at the compressor end (CE).
Fig.6: Contact surfaces of a two-piece foot
TE Foot on turbine end
CE Foot on compressor end
A Foot contact surface
Gas outlet casing with horizontal gas outlet
When the gas outlet casing has horizontal gas outlet NB090 or NB270 (see outline drawings
documentation), it is not possible to fit all eight foot screws to the engine support.
Only three screws can be fitted in each case (see Table9: Pre-tightening torque sequence
→16)and (see Table11: Pre-tightening torque sequence →17).
If the maximum allowable forces and torques on the casing of the low-pressure stage, as
well as the maximum allowable vibrations in the low-pressure stages, are observed, the low-
pressure stages can also operate with a reduced number of foot screws.
u With a reduced number of foot screws, the same steps and tightening procedure shall ap-
ply to secure the low-pressure stage as with the complete number of foot screws. The
tightening sequence for the foot screws with a reduced number of screws can be found in
the appropriate tables.
We recommend contacting ABB Turbocharging for new applications of the low-pressure
stage with horizontally-mounted gas outlet NB090 or NB270.
Step 1:
u Check screws in accordance with the General Information table Power2 500 LP – Fixing
screws →11.
Page 15 / 29
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