l-05 critical activities anp-2

7/31/2019 L-05 Critical Activities Anp-2

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2/11

1. CATENARY AND ALIGNMENTS

Aim - to achieve proper alignment ofvarious rotors, Loading of rotor on Brg.

Deviation lead to problem high shaftvibration, high brg. Vibration, high babbittmetal temperature of bearing.

Stages of maintaining catenary- before &after pedestal grouting, during rotoralignment with brg on position.


3/11

2. ASSEMBLY OF BEARING AT SITE

Measurement of bore dia of brg, journaldia of shaft,

Measurement of contact surfaces- toruswith pedustal, brg bottom with torus,bearing with shaft journal. (0.03 mmtightness)

Check for oil openings, cleaning ofpedustal,


4/11

3. COUPLINGS AND ALIGNMENTS OFROTORS

Function- to connect two or more shafttogether to form a shaft assembly.

Coupling- measurement of axial run out

of coupling face, geometry of entirecoupling face i.e. concavity/convexity.

Rotor align. follow continuous deflection

curve as per drg of particular machine.Axial & Radial position of two coup. flange

Casing alignment wrt rotor alignmnt.


5/11

3. COUPLINGS AND ALIGNMENTSOF ROTORS (cont)

Measure before coupling- coup hole dia,coup bolt dia, spigot / recess of coupling,

shaft journal diameter. - axial run out of coupling face.

- radial run out of rotor.

- Axial clearance (slip gauge), radialclearance (dial gauge) 0f two coupling.


6/11

4. SWING CHECK

- Swing check is a measurement of radialthrow at the free end of the compltd rotor.

Swing caused due to non parallelity ofcoup face.

High swing value causes- high shaftvibration, high brg shell temperature.

Swing depends upon axial run out ofcoup face, Dia of coup, length of rotor.


7/11

5. AXIAL CLEARANCE TEST (BUMPTEST)

Movement of shaft in +ve or ve dirctionwhile casing is fixed and radially align.

Based on bump test rading, axial positionof shaft wrt casing is to be fixed and NOTTO BE ALTERED. (i.e. Rotor Zero Position)


8/11

6. ROLL CHECK

Measurement of minimum radial clearanceof HP, IP & LP casing by moving the

casing radially while rotor is rotated byhand.

Positioning of casing depends on top &

bottom radial clearances.


9/11

7. HORN DROP TEST

To determine the loading of the casing on eachcorner.

Stages of horn drop test- without connecting the

piping, without connection of breach nut ofHPCV, after completion of all piping connectionto turbine casing.

This test indicat the quality of work during

assembly / welding of pipe lines with casings. Problem may cause- high vibration, failure ofbarring gear in hot / cold condition, obstructionduring expansion of machine.


10/11

WELDING OF STEAM INLET ANDEXHAUST PIPE LINES WITH H P

AND I P CASING

Floating of piping.

Adjustment of piping hangers.

Making free joint at turbine connection.


11/11

THANKS

THANKS

l-05 critical activities anp-2

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