ML20072J916

Rev 0 to Large Electric Motors - Disassembly & Assembly

ML20072J916
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	10/20/1977
From:	GOULD, INC.
To:
Shared Package
ML20072J835	List: ML20072J833 ML20072J850 ML20072J877 ML20072J888 ML20072J895 ML20072J903 ML20072J910 ML20072J916 ML20072J922
References
35.054.01, NUDOCS 8303300260
Download: ML20072J916 (11)

Text

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SP Number 35.054.01 Revision 9 Date Eff. 10/20/77 TPC TPC TPC LARGE ELECTRIC MOTORS - DISASSDIT.LY & ASSD*DLY .

D O .

1.0 PURPOSE To provide general instructions to station personnal for the disasse:bly and assembly of large (4,160 volt) electric :.otors.

2.0 RESPONSIBILITY The Maintenance Engineer shall b'e responsible for ensuring the proper implementation of this procedure.

rPric21.303-6.421

O CONTROL (V COPY _ $ .

HOV 171977 8303300260 830317 PDR ADOCK 05000322 A PDR

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3.1 L;rg2 G1cetric motors hr.va to b2 discsss= bled..frca time to time to rap 1oca worn bacrings, to cloan dirty windings cad /or. to dry the insulatien.

i 3.2 This procedure provides generic procedures .for the disassembly,' assembly and cleaning of 4160V motors. However, the (pecific' vendor instruction

'(nl manual should be checked before doing any naintenance work on the motors.

{d Appendix 12.1 lists all large noto,rs and gives the reference to the proper instruction manuals.

3.3 The following topics are contained in this procedure:

8.1 Horizontal Motor Disassembly  ?*K' 3

8.2 Horizontal Motor Reassembly 4 . .

8.3 Cleaning and Drying Instructions 5 8.4 Vertical Motor Disassembly 8 8.5 Vertical Motor Reassembly 9 Appendix 12.1 List of Large Electrical Mo: ors

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4.0 PRECAUTIONS 4.1 If the rotor fan blades are changed, rebalancing the notor may be -

necessary. -

4.2 If drying insulation, carefully control the temperature, avoid hot spots.

4.3

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Replacement bearings may be from a different canufacturer. Verify that s

) they are equal to the originals used in the notor.

4.4 Whenever a bearing is replaced, rigid cleanliness shall be observed through every step of the operation.

4.5 When pulling a ball bearing, exert the force of the bearing puller only on the inner race to remove the bearing frc:t the shaft. -

4.6 If the motor shaft has been seriously scored, it should be put between centers and reground.

4.7 Before starting to disassemble or assemble a notor, check the respective ~

vendor manual for specific precautions.

4.8 When using a bearing puller, protect the shaft end.

4.9 Before cleaning a rotor, except when cleaning the outer surface, verify that all power to the motor and control power is disco.nected and the breakers are tagged out.

i SP35.054.01 Rev. 0 in 10/20/77 Page 2 1 l

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4.10 Whsn drying ctctcr windings inculatica resistence eheuld b2 msasursd bafore

. hect is cppliad, cnd evary six to oight. heurs.2herecf ter until.resistanca a

readings tre steady. .

,- 4.11 Maintain a uniform temperature in the nachine to.obtain ' constant resistance

, readings. ,- -

( 4.12 When using a lif ting rig, verify that the rig is installed correctly and that its capacity is big enough to' lif t the motor safely.

• 5.0 PREREQUISITES 5.1 Station Equipment Clearance Permit. .

5.2 Radiation Work Permit (if applicable). . ,

5.3 Horizontal or Vertical Motor Equipment History Fora, as applicable.

6.0 LIMITATIONS AND ACTIONS .

6.1 When drying insulation, do not exceed 2000F unless otherwise specified in the instructions for the respective motor. -

7.0 MATERIAL AND TEST EQUIPMENT .

7.1 Dial Indicator to align the motor and drive shafts. -

• 7.2 Rigging to remove end shield and rotor. -

8.0 _ PROCEDURE I,,

t/"'s 8.1 Horizontal Motor Disassecbly - -

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8.1.1 Encure that the prerequisites of Section 5.0 have been met.

8.1.2 Remove the electrical leads and tag for identification. Hegger the motor in accordance with Reference 11.13.

8.1.3 Disconnect, if necessary, the notor from the drive. Mark the position of both coupling halves before disconnecting if not already done.

8.1.4 Heasure and record the coupling alignment on the Equip 2ent History Fo rm.

• 8.1.5 Remove air inlet louvers and dust covers if any.

8.1.6 Remove 1 cads of stator RTD's and/or bearing thermocouples if any.

8.1.7 Drain oil from bearings.

8.1.8 Clean end shicids and/or bearing caps before renoval.

SP35.054.01 Rev. O Os 10/20/77 Page 3 h

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8.1.9 Remova upp2r sud this1ds cad /cr biaring caps. .

I 8.1.10 Macsura cnd esecrd th2 cir gep cs ~specified.cn Equipmert History Form.

8.1.11 Remove bearing temperature devices if any.

,I 8.1.12 Ball bearing replacement.

~ 1. Recovebearingusingshbearingpuller,exertforceonlyon inner race. . -

2. Check shaf t diameter for proper size of replacement bearing.

3. Heat the new bearing in an oven to 200 F. While it is hot, 0

slide bearing on shaft, make certain that the inner racc cakes a firm, even contact with shaft shoulder. --

8.1.13 Split sleeve bearing replacement.

- 1. Renove the top half of the bearing.

2. Raise motor shaft a few mils to remove load from bearing.

3. Rotate the lower half of the bearing 180 and remove.

NOTE: k' hen replacing a sleeve bearing, always inspect the bearing journal surfaces. They must be smooth and polished, slight scoring can be removed with crocus .

cloth.

4. Fit the new bearing and adjust end play.

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8.1.14 Measure and record the bearing dimensions specified on the Equipment History Forn. .

8.1.15 Using a jack or chain hoist to support the rotor, renove the lower end bells and slowly lower rotor onto stator.

8.1.16 Protect shaft bearing journals against dirt and scratching.

8.1.17 Using chain hoists" remove the rotor with the help of an appropriate shaft extension. (Check with manufacturers instructions as to which end the rotor has to be removed.)

8.2 Horizontal Motor Reassemb1v -

8.2.1 Clean all motor parts, especially stator and rotor ventilating passages and nachine mating surfaces such as bearing brackets, stator support seats and stator support bars before reassenbling.

8.2.2 Check for wear on bearing parts including journals, bearings, seals, oil rings and guides.

I SP35.054.01 Rev. Q

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. LEIG3 UGpicce rotor in stator, reversing th,e procedure for disasssmbly.

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. Prstset shef t biccing jsurnals. .

8.2.4 Replaca cir baffles cn ctator castably if nicassary.

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8.2.5 Replace inner seals, inner seal gaskets and oil rings on shaf t if notor is so eqdipped. .

8.2.6 Replace lower end bells.

• 8.2.7 Raise notor shaf t a .few mils and roll lower halves of bearing bushings into their seats. Replace any bearing temperature devices.

8.2.8 Measure and record the air gap as specified on the Eq'uipment History Form. *

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8.2.9 Place top bearing bushing halves on shaft with the oil ring in the bearing slots. - Align upper bearing halves carefully with lower halves.

8.2.10 Install bearing caps, oil seals and end cap. .

8.2.11 After reassembly, flush then fill the bearing oil reservoir with the proper grade oil.

(See Lubrication instructions.)

8.2.12 Af ter reassembly of the notor, verify that the bearings are properly lubricated (oil level at the oil level mark or in the ,

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middle of the sight glass, ball bearings packed with the proper grease). Turn totor by hand a few turns to ensure that oil or grease is distributed over the entire bearing surface. -

8.2.13 Reconnect leads for stator RTD's, and/or bearing thernocouples if any. ,

8.2.14 Replace air inlet louvers and dust covers if any. '

8.2.15 Megger motor per Reference 11.13, then makeup the cotor leads.

8.2.16 Verify correct motor rotation using Motor Rotation Tester.

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l 8.2.17 If required, run the cotor without load and check for any oil leaks or excessive vibrations. .

l 8.2.18 Measure and reccrd the coupling alignment as specified on the Equipment History Form.

8.3 Cleaning and Drying Insulation EOTE:

A variety of satisfactory and acceptable nethods are available for keeping equip =ent in a state of cleanliness that will result in longer life and' greater reliability. The choice of nethod will l

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SP35.054.01 Rev. 0 10/20/77 Page 5

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, d:p;nd greatly en tin), cvailebili'ty of squipment, cnd, to soma cxtcnt, cn tha insulction system. ..

8.3.1 Outside . .

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8.3.1.1 Stop the cotor to be cleaned.

Wipe off dust, dirti oil, water, etc., from external 8.3.1.2' surfaces of the inachine. ,-

8.3.1.3 Remove dir^t, dust or other debris from ventilating air inlets.

8.3.2 vacuum Cleaning , .

For removal of loose dust, dirt and particles, the use of suction is preferable to blowing out with compressed air since there is less possibility of damage to the insulation and less chance of getting conducting or other hareful particles into areas that may later, result in damage during operation.

CAUTION: Do not use a cetal suction piece. This will prevent .

damage to the windings.

8.3.3 Compressed-air Cleaning -

Compressed air is effective and convenient for removing loose dust and particles in otherwise inaccessible areas such as airducts and between coils at the end turns.

J CAUTION: Care must be taken to make sure that the air supply is dry and that excessive ~ air pressure is not used.

See the vendor instruction canual for recome. coded air pressure; if not stated, limit to 30 psig.

8.3.4 Cleaning with Uater and Detergent 8.3.4.1 Disassemble the motor per procedure 8.1 or 8.2 as applicable.

CAUTION: To minimize possible damage to varnish and insulation, a fairly neutral nonconducting type of detergent should be used. See vendor instruction manual for recommanded detergent's and concentrations.

8.3.4.2 Use the portable Ebear Electro-Jet Steam Cleaner to clean the stator windings. (See Reference 11.11 for operating instruction for the Ebcor Electro-Jet Steam Cleaner.)

8.3.4.3 Af ter cleaning, rinse the windings with lo's pressure steam.

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SP35.054.91 Rev. 0 10/20/77 Page 6

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8.3.4.4 Dry th2 windings par proesdure 8.3.5.

8.3.5 Dryinz Stator Windings .

.e NOTE:

Insulation resistance will decrease as the motor varms up; but will begin to increase shortly as the dryout continues.

8.3.5.1' Electric Heater Drying '

.1 Remove the rotor per procedure 8.1.1 or 8.4 as l applic'able. .

.2 Install the heaters if possible under the motor and t' allow for even distribution of the heat along the length of the motor. .

.3 Attach temperature indicators to windings.

.4 Direct a fan on stator to carry away the moisture.

.5 Erect an enclosure making it as air-tight as practicable ar.d leaving a hole in the top to allow moisture to escape.

.6 Apply heat as specified in the vendor's instruction manual.

.7 Discontinue the heating when the megger readings

• remain constant. .

( 8.3.5.2 Circulating Current Drying '

.1 Recove bearing housings.

.2 Center the rotor in the stator core.

.3 Wedge fiber strips into the lower part of the air gap, so rotor does not touch stator core.

.4 Direct fan on unit to blow ausy excessive moisture.

l NOTE: If an enclosure is used, ensure that a hole is made in the top to allow moisture to escape.

.5 Attach temperature indicators to windings.

.6 Apply a controlled current of the same number of phases, cnd the same, or less than rated frequency to l

the windin2s. The voltage used should not be core than 10% of normal, nor should it cause core than 60%

of normal full load current to pass through the windings.

SP35.054.01 Rev. 0 10/20/77 Page 7

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"- . .1/ Maintcin hect cs specifisd in the vandors instr'sc.tica

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.8 Discsntinua ths haating witan the megger recdings remain c'onstant.

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8.4 Vertical Motor Disassembly .

8.4.1 Ensure the prerequisices of Section 5.0 have been met. .

8.4.2 Disassemble the coupling and check the alignment. Record the I coupling alignment as specified on the Equipment History Form. I 8.4.3 If necessary, disconnect the motor from the pump, and match = ark

, both coupling halves before disconnecting, if not already done.

8.4.4 Remove the electrical leads and tag for identification. Megger the motor in accordance with Reference 11.13.

8.4.5 Drain upper and lower bearing reservoirs. ,

8.4.6 Remove lower, drain pipe ar.d gauge if provided.

8.4.7 Remove end shield cover.

8.4.8 Measure and record the shaf t height, if necessary, as specified on the Equipeent History Form.

8.4.9 Remove coupling (if hollow shaft) and ratchet, if provided. *

/ NOTE: Da not remove water coils in water cooled bearings unless f]N) coils need repairs.

8.4.10 Jack up the shaft or support by chain fall.

8.4.11 Remove lock nut and washer, thrust rings or pucp shaf t adjusting nut.

8.4.12 Remove thrust bearing and upper guide bearing (Journal sleeve) if provided.

8.4.13 If rotor has to be recoved, remove end shield. .

8.4.14 Remove motor half coupling. .

8.4.15 Remove the rotor out of the stator.

B.4.16 Remove lower guide bearing.

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r . . U.9 WarticaW Motor Ranssambly .  ;

8.5.1 Clocn c11 encor parts, cspecially seccor end rotor vantilating i

l pnssagas end acchina mating surfecas such as baaring brackats, stator support seats and stator bar,s before reassembling.

[ ~g 8.5.2 Check for wear.on bearing ' parts including journals. , bearings, and tQ seals.

• 8.5.3 Install lower guide bearing. .

8.5.4 Replace rotor in stator. Protect' shaft bearing journals.

8.5.5 Install end shield. , .

8.5.6 Install thereocouples if provided.

• 8.5.7 Install upper guide bearing, if provid'ed, and thrust bearing _

according to vendors instructions.

8.5.8 Replace the lock nut and washer, thrust rings or pump shaft adjusting nut according to vendors instructions.

8.5.9 Measure and record the shaft height as specified on tha Equip.ent History Form if necessary.

8.5.10 Install the rachet, if provided, and the coupling (if hollow shaft). .

8.5.11 Install lower drain pipe and gauge if provided. .

(, .

8.5.12 Fill the upper and lower bearing reservoirs with the proper grade oil (See lubrication instructions).

8.5.13 Turn motor by hand a few turns to ensure that oil is distributed over the entire bearing surface.

8.5.14 Reconnect the motor to the load and verify correct motor rotation using. Motor Rotation Tester.

8.5.15 Megger the motor p'er Keference 11.13. .

8.5.16 If required, run the notor without load and check for any oil leaks or excessive vibrations. .

8.5.17 Measure and record the coupling alignment as specified on the Equipment History Form.

9.0 ACCEPTANCE CRITERIA I 9.1 Inculation Resistance tests are above mininun readings per instruction manual.

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- lQ.0 FI.iAL CO::Dgvh0NS

• 10.1 Macter Hold Off returnad to.ths NSO. ,

10.2 Radiation Work Permit terminated (if applicab.le)..

10.3 Equipment History Form forwarded to the Haintenance Er.gineer for revieu and f( s) filing per Reference 11.12. '

11.0 REFERENCES

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11.1 CEH-31CO, G.E., Induction Motors, File 'No. ICll.120.

11.2 CEH-3292B, C.E., Vertical Induction Motors, File No. Ell.120.

N 11.3 CEH-1897B, C.E., Vertical, High-Thrust Polyphase Induction Motors, File No. -

IE21.120 11.4 51X2349-03, Allis Chalcers, Large Frage Horizontal Induction Motors, File No. 1251.120.

11.5 (Later) Electric !!achinery Hfg. Company, Large Vertical Induction Motors 250 HP and Larger, File Code IN21.120. .

11.6 05X2574-02, Allis Chalcers, Versa Pac Squirrel - Cage Inductica Hotnrc, File No. IN21.120 11.7 1400-INS-227A, Electric Machinery Mfg. Company Large Vertical Induction.

Motors 250 HP and Larger, File No. IN71.120.

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11.8 (Later) "

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-11.9 I.L. 3030-DI, k*estinghouse, Instruction for Large AC Hotors, File No.

IP41.110.

11.10 (Later) 11.11 SP 32.007.01, Decentacinstion Ecuierent Operation.

, 11.12 ANSI N45.2.9 Requirecents for the Collection Storage and Haintenance of

! Quality Assurance Records for Nuclear Power Plants.

'11.13 SP 32.039.01, Insulation Resistance Test of Auxillary Electrieel Ecuipment.

11.14 SP 12.023.01, Station Housekeepint i

12.0 APPEMDICES 12.1 List of Large Electrical Motors.

SP35.054.01 Rev. O U j r~' 10/20/77 Page 10 6 -

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LIST CF LARGE ELECTRICAL HOTORS ,

Number Manufacturer

• Type Operating ManuxL_

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J tia=e/Num*er

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2 CE ' custom 8000 Rzference 11.1 ,

- j CRD 1: ster Pump /IC11-

• Horizontal P-017A & B Sefererce 11.2

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RHR Pump /IEll*P-014A-D

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4 -

CE TRI-CLAJ Veritcal 2 GE TR,I-CLAD ikference 11.3 9LCore Spray Puop/IE21*

P-313& & B Vertical i

A-C (LATER) Reference 11.4 Fire Pucp/l:143-P-059 1 Horizontal 2 E-M (LATER) amference 11.5 Condensate Pump /l ;21-

• Vertical P-007A & B Reference 11.6 Condensate Booster Pu=p/ 2 A-C ANW IN21-P-027A & B Horizontal E-M (LATER) Ra'farence 11.7 Circulating Water /1N71-P- 4 ,

Vertical 963A-D Screen Wash Purp/IN~1-P- / 2 E-M (LATER) Raference 11.7 217A 6 3 - Vertical ~~

A-C (LATER) FMference 11.8 Condensate Transfer /IPil- 1 P-011 Horizontal 4 West. Life-Line D F.aierence 11.9

i/ Service 'nater Pump /IP41* Vertical

, [1P-003A-D Ref erence 11.4 TECLC'.! Pucp/IP43-P-034A 2 A-C (LATER)

&B Horizontal Reference 11.10 4

Instrutent & Service Air 3 West. (LATER)

[ ,. Compressor /IP50-C-051A-C Horizontc1 k

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• Manufacturer: G.E. Ceneral Electric j A-C Allis Chalmers l E-M Electric Machinery Mfg. Co.

l West. Westinghouse i

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