l-06 erection guide line of 500 mw turbine anp-4

7/31/2019 L-06 Erection Guide Line of 500 Mw Turbine Anp-4

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ERECTION GUIDE LINEOF

500MW KWU

DESIGNED MACHINES


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1. Checking of foundation before casting. Pitch and verticality of all the Insert to be ensured

Leveling of the fixed point and their locking. Ensure proper welding in all the inserts wherever applicable. Ensure welding in piping sleeve and plate for centering pin of LP front & rear

girder. Ensure proper locking of all the insert and bottom plates where anchor plates are

to be installed during erection.

2. Checking of foundation after casting and its preparation for commencement

of erection. Install elevation mark on TG deck and preserve it for future reference for next 30

years till machine under operation. Install longitudinal and transverse axis and preserve them till commissioning of the

machine. Check pitch and verticality for all the inserts . Ensure level of all the fixed anchor point of the pedestal. , if required grinding /

leveling may be done. Any cavity observed after casting on TG deck to be recorded along with

photograph.

Sequence of Erection


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Cavity observed in anchor plate area of the pedestal to be corrected / filled by

epoxy only.Ensure elevation of pedestal and base plate so that 70 to 90 mm gap for

secondary grout is available.Any shift in centerline can be done at this stage depending upon the pitch of

various inserts

3. Preparation of pedestal and LP base plate for its placement over

foundation.

Check half bore error of the pedestal and account it during setting of pedestal

level. Carry out color matching in pedestal in the following areas:

Bearing side padKey slots of axial / radial keys.

Spherical / cylindrical support.Bearing cap / yoke. Seating area of casing palms and casing clamps.Feeler tight joints of pedestal covers.Ensure clamping of jacking oil hose pipes.Ensure bearing contact between torus and its support.

Nos. of shims to be limited to less than three no. If required packers may beinserted accordingly.


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4. Alignment and grouting of turbine pedestal and LP base plates

Align and level the pedestal and LP base plate and ensure 70-90mm thickness for

secondary grout. Necessary chipping may be done if the gaps are less than 70-

90mm. In case of higher gap , the gravels are to be mixed up with non shrinkagecement .Level of the pedestal should be set as per the catenery value with correction for half

bore error , if any.During alignment of front pedestal the pedestal seal bore and other reference on

front of the pedestal marked from BHEL Haridwar has to taken as reference.

Individual pedestals are kept in level conditions till date . It is recommended to keepthe slope in the pedestal particularly for the fixed pedestal machines. ( a feedback

requested).During any leveling of pedestal , only water level system to be used.Only gravel of required size are to be filled up in all the inserts. Fresh lot of non

shrinkage cement to be used. Preferably order to be placed on party when actual

erection starts.Curing of grout to be done for minimum of 21 days.Grouting supervision to be done by BHEL and not by supplier.Pouring of metal strictly to be done from one end only , however depending upon the

construction of the pedestal , it may be allowed from two end.Grout metal may be pushed with the help of some plates and tie rods to facilitate the

flow below pedestal.


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Check and record pedestal centering / alignment / catenery value after their

grouting.

Elongation of foundation bolt should not be done earlier than 28 days.Longer time will improve the strength of the grout and then tighten the f

bolts.

All the bearings are aligned in the works with the pedestal and then their

seats are dowelled before their dispatch to site but the thrust bearing is not

dowelled from the works.

Recommended to dowel the spherical seat of the thrust bearing with the

pedestal before its dismantling to facilitate its proper alignment in the

pedestal. Alternatively the axial and radial position of the spherical support

with reference to the pedestal to be measured and recorded for all future

reference.

Seating plates for the anchor bolts are to be ensured for the good contact

with the concrete base. Filling of non-shrinkage cement is not permitted in

cavity near seating plate area.


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5. Preparation and placement of HP module over foundation.

Carry out color matching in various key slots and palm packers area of the casing.Check/ correct rotor coupling faces for concavity / convexity Any correction , if

required, to be done before installation of module in position.Place and provisionally align HP module without removing the transport device.

Ensure parallity of radial and axial key slot of the casing with pedestal. Incase of

variation , the module may be removed and slots are to be corrected for its

parallality.Place / install HP module first .

Check / Record run out of journal & coupling faces .Check and compare roll check and bump check value of the HP module with MU

value.

6. Place /install IP module after completing checks for HP module..

Carry out similar checks as mentioned for HP module. IP rotor face run out to be checked with one side on lifting tackle.The bump test vale may be checked at a later stage during coupling with HP rotor.


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7. Alignment of HP / IP / LP rotors.

Align the rotors maintaining pedestal seal bore and its catenery. To facilitate it is

recommended to maintain initially the catenery on journal 3 & 4. Any variation / error

in seal bore reading for various rotors are to be distributed . Measurement ofcatenery are to be done with height measuring blocks and water level jar.During alignment of rotors bearing side pads are to be kept loose or side pads may

not be fitted.Always install upper half of the bearing in position to avoid entry of dust and foreign

material. For any oiling on journal , the upper half bearing may be removed and put

back immediately after pouring of oil. Preferably use oil better than grade 180.

The oil can also be given in the bearing through jacking oil hose pipe with the help of

a hydraulic pump used for hydraulic jack. This will avoid removal of bearing every

time for pouring of oil.The alignment of bearing with respect to rotor is to be ensured before rotation of the

rotorEnsure SOC of the bearing when rotor is just loaded on the bearing . Any correction

in alignment of the bearing for achieving the SOC is possible till rotor is not rotated

on the bearing. The correction is to be done by rotating/tilting the cylindrical support

of the bearing.Slip gauge to be used for alignment of the rotor in place of feeler gauge.

HP-IP , LP-IP rotors to be aligned without coupling of any of the rotor together.


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Align and position HP/IP/LP rotor as per their face measurement .Do not rotate rotor with barring gear teeth.

Always use periphery hole for rotation of the rotor.Adjustment between torus and bearing body is permitted to a value of 0.35 mm

in the Left/ Right and un/down side during lifetime of the bearing. This adjustment

preferably Should be left for subsequent overhauling of the machine.Any adjustment in left/right direction for more than +/- 0.1mm may be done by

shifting the cylindrical support of the bearing. The height adjustment can be done

By adjusting shims below the cylindrical support.Please note that FIXED PEDESTAL machines requires more accuracy during

erection process compared to SLIDING PEDESTAL machines.


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9. Fixing of axial position of complete rotor system and assembly/ fitting of axial

keys of thrust bearing.

The axial position of the rotor is decided considering following points:

a) Thrust bearing axial key , front and rear , sizes should be as near as possible

b) Axial keys of HP/IP casing , front and rear , sizes should be as near as possible

c) Turning gear nozzle axial gap as per design value .

d) Axial keys of LP inner outer casing should be as near as possible.

e) Gap between MOP shaft and HP rotor as per the design value .

f) Thrust pad sizes of front and rear should be within +/- 0.1mm.

The thrust pad need not to be fitted during fitting of axial keys for the thrust bearing.Ensure alignment of thrust bearing with respect to thrust collar of the HP rotor.No axial movement in thrust bearing is permitted after fitting of axial keys of the

bearing.

Verticality of the thrust bearing to be ensured before fitting of the axial keys of thebearing.Parallelity should be maintained in all the pads of turbine or Generator ends. Sizes of

the thrust pads should be within 0.05 mm .Thrust pads are to be colour matched with the thrust collar of the HP rotor.

Ensure thrust float of the HP rotor along with the proper blue contact on the pads.


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10. Assembly of bearings

Check / ensure SOC / TOC of bearing.No scrapping in babbit metal is permitted for achieving of the bearing clearances.Any deviation (askew) in SOC of bearing to be corrected by aligning the

bearing .and shifting

of its cylindrical support. The SOC for all the bearings should be checked at very

initial stage when the rotor is not rotated even once.Parallelity to be ensured in slot of the side pad of the bearing. If required , the

necessary correction is to be carried out by cutting / scrapping the pedestal slotsafter removing the bearing.Bearing top key slot for various keys are to be ensured for their parallelity. If

required, the bearing cap to be re-positioned and re-dowelled.The bearing caps are dowelled from the works but the problems are faced in

parallelity of the key ways and need correction at site.


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11. Boxing up of pedestal for oil flushing

HP/IP casing insulation to be done after oil flushing. This will avoid spilling of oil

on insulation and any damage due to fire.

All expansion pickups to be installed before oil flushing of the machine. This will

help in proper zero position of the rotor due to its room temperature.

The pedestal work in all respect should be completed before oil flushing of the

machine.

Bearing side pads are to be removed and deflectors for oil flushing to be

installed.

Oil filters supplied for the bearing throttles are meant for ensuring the proper oil

flushing. These filters should not be installed during barring gear operation.The filters , if installed , during the oil flushing or barring gear operation results

in their damages.


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12. Assembly of LP casing

Assembly of guarder and end wall can be done immediately after completion of LP

base plate grouting.

Inner casing to be installed when all major components of the condenser are

positioned.

Carry out color matching in all machined area of the LP guarder and end wall.

Check/ensure parallity of the key slot of the end wall.

Leveling & alignment of LP guarder & the end wall after their assembly. LP casing

level to be maintained as per the catenery of the machine.

Radial alignment of LP casing to be done with piano wire and axial alignment withrespect to bearing centerline i.e. bearing no: 3 & 4.

Assemble final radial / axial keys of the casing.


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After alignment & leveling of LP casing , the final radial and axial keys can be

installed along with the LP outer casing packers.

LP inner casing can be boxed up independent to HP/IP module , if the radial andaxial clearances are found ok. In case radial clearances are not in order, then

casing box up can be done only after roll check of the LP casing.

The LP rotor run out on journal and coupling to be recorded before box up of the

casing. The concavity / convexity of rotor coupling faces is also to b ensured

before placement of rotor.

In case the IP casing is received in boxed up condition at site , then the boxing

up of LP casing should not be done till reaming / honing , final swing check &

CRO of HP/IP/LP rotors is completed.

LP rotor bump check should be recorded in lower half casing before box up of

the casing


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13. HORN DROP check of HP-IP Casing.

Horn drop check of the casing to be made without connection of any pipelines

with the casing.

During making of horn drop the casing radial keys should not be installed androtor should be free inside the casing.Horn drop values should be made within 0.05 / 0.10 mm in left / right direction.

Any variation in horn drop values after connection of pipelines may be left as it is

till positive loading on the casing palm is observed.No correction in horn drop values can be done by adjusting the height of the

packers.Correction of horn drop value can only be done by identifying the defective

pipeline and subsequent cutting/re-welding.


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Spring Loaded Foundation


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SCHEMATIC FOR GERB SPRING

TIE ROD

SHIM

TG DECK

TG COLUMN

NOTE:

1. THESE READINGS ARE IN

ADDITION TO READING

TAKEN BY GERB ON THE

PROTOCOL DOCUMENT.2 TURBINE ENGINEER

ALONG WITH CIVIL

ENGINEER TO ASSOCIATE.

A. STICK MICRO METER READING AT FOUR

LOCATIONS BETWEEN DECK AND

COLUMN. MARK THE LOCATION OF

READING (USE METAL MARKER).

B. STICK MICROMETER READING AT FOUR

LOCATION OF EACH SPRING ASSEMBLY.

C RECORD TOTAL THICKNESS OF SHIMHEIGHT AND NUMBER OF SHIMS.

A AB B

C


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l-06 erection guide line of 500 mw turbine anp-4

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