PART- VII
PLACEMENT OF HP MODULE IN POSITION
Ensure matching of all the four palms
of the module where it is resting on the pedestals.
Ensure matching and paralleling of
front and rear key block of the HP casing.
Assemble all four jacking screw of
HPC and ensure their free movement.
Clean journals and coupling of the HP
rotor.
Record journal diameter, coupling
hole sizes and spigot diameter of HP rotor.
Lift module in level condition and
place it in position by keeping it 3 to 5 mm toward front pedestal side.
During placement of module use
temporary packers similar to permanent and additionally support it by four
jacking screws.
Ensure load on all four packers with
the help of some additional shims if required.
Install temporary radial and axial
keys of the casing.
Prepare HP rotor for alignment
PLACEMENT OF IP MODULE IN POSITION
Ensure matching of all the four palms
of the module where it is resting on the pedestals.
Ensure matching and paralleling of
front and rear key block of IP casing.
Assemble all four jacking screws of
IP casing and ensure their free movement. If these jacking screw holes are provided
with the bolts from factory then same are to be removed before placement of
module.
Clean IP rotor on both sides
including coupling and journal.
Record spigot /recess, journal diameter,
and coupling hole sizes.
Lift the module in level condition and
place the module in position by moving about 7 to 8 mm towards generator end.
Use temporary packers for placement of module in position and additionally
support the module with jacking screws.
Ensure load on all four packers with
the help of some additional shims if required.
Provisionally align the casing on
front and rear pedestal bore. Install temporary radial and axial keys of the
casing with some shims.
Prepare IP rotor for alignment
Following measurements are carried
out during positioning ,alighnment of HP
cylinder module.
Journal diameter and corresponding
Bearing-bore.
Spigot and Recess dimensions of
Couplings.
Out of flatness of coupling Faces
(within 0.02 mm concave) & Coupling hole diameter.
Transverse & Axial alignment of
HP Rotor with Bearings & seal bores during its Placement on the Bearings
Centring and axial position of HP
casing w.r.t. rotor
Check parallelism during tightening
of Breech-nut on HP Inlet Insert.
Assembly of
Hydraulic turning Gear with HP Rotor. Check Clearances . Assembly of Emergency
Governor.
HP rotor float and Roll check.
For measurements we use instruments (
calibrated to national standard) Vernier
Caliper, Micrometer , Dial gauge , Straight Edge , Depth Micrometer , Filler
Gauge etc.
HP module of 660MW turbine is under placement.
660 MW IP module under placement.
Continued for Part-viii
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