B-2 & I-123 5 of 5 Steam Turbine

MHI BUSINESSCONFIDENTIAL

Turbine and AuxiliariesTurbine and Auxiliaries


CUTAWAY VIEW OF TURNING OIL PUMP




TURNING OIL PUMP




CUTAWAY VIEW OF EMERGENCY OIL PUMP




EMERGENCY OIL PUMP




1 CASING COVER2 CASING BASE

HP-IP EXTENSION STUB SHAFT7VENT PLUG14ROTOR POSITION DISC17

21 MOST DEVICE

OVERVIEW OF TURBINE MAIN OIL PUMP




Realign extension shaft to HP-IP rotor shaft

Deterioration in concentricity between HP-IP rotor shaft and extension shaftMaximum 0.05 mm

Measure-ment

Misalignment to HP-IP rotor shaft

No crackNo crack

VisualNDE (if impeller removed)

Crack

Replace extension shaft

No visible wear

VisualWearExtension shaft

4

RemarksAction to be Taken

(if beyond acceptable limit)

Check Reference

Check Method

Major Check Item

DescriptionNo.

TABLE 3-2 MAJOR OVERHAUL MAINTENANCE CHECKLIST




Replace the keyNo visible wear/erosionNo crack

Visual NDE (dye penetrant)

Wear, cracksImpeller key

3

Replace the impellerNo visible wear/erosionNo crack

Visual NDE (dye penetrant)

Wear, cracksImpeller2

Carried out by specialist contractors

Remove using carborundum stoneRemachine slot

No visible ridges

VisualCasing seal ring slot wear

Carried out by specialists.

Standard mechanical casting recovery methods

No visible wear or cracks

VisualWear, cracksCasing1



Check Reference

Check Method

Major Check Item

DescriptionNo.





CUTAWAY VIEW OF TURBINE MAIN OIL PUMP

11

10 8

9

1

14

3

13

12

4

2

5

6

21 17

15

16




CUTAWAY VIEW OF TURBINE MAIN OIL PUMP

14

10

30

31

1

586

2

12

14

1

SECTION A-A

12 4714

20 18

19

1721

9




EXPLODED VIEW OF TURBINE MAIN OIL PUMP

1 CASING COVER2 CASING BASE3

IMPELLER KEY5

IMPELLER4

SPACER RING6

IMPELLER NUT

HP-IP EXTENSION STUB SHAFT7IMPELLER WEAR RING8GRUB SCREW9IMPELLER SEAL RING10SHAFT PENETRATION SEAL RING11STRAIGHT PIN12PLUG13VENT PLUG14

1516

ROTOR POSITION DISC17HOLDING DISC18SPRING19

20 HEX. SOCKET BOLT21 MOST DEVICE22 SPACER RING23 SPACER RING24 'O' RING25 'O' RING2627

PINBUSH

28 STUD29 NUT30 PIN31 BUSH32 STUD33 NUT

CASING STUDNUT

34 TAPER PIN35 HEX. SOCKET HEAD BOLT36 SEAL RING JOINT PIN

11

6

10

98

1 CASING COVER2 CASING BASE3

IMPELLER KEY5

IMPELLER4

SPACER RING6

IMPELLER NUT

HP-IP EXTENSIO7IMPELLER WEA8GRUB SCREW9IMPELLER SEAL10SHAFT PENETR11STRAIGHT PIN12PLUG13VENT PLUG14

1516

ROTOR POSITIO17HOLDING DISC18SPRING19

20 HEX. SOCKET B21 MOST DEVICE22 SPACER RING23 SPACER RING24 'O' RING25 'O' RING2627

PINBUSH

28 STUD29 NUT30 PIN31 BUSH32 STUD33 NUT

CASING STUDNUT

34 TAPER PIN35 HEX. SOCKET H

3

13

10

17

20

19

18

36

11

36 SEAL RING JOIN

36

36

36

15

2

26




Change seal ring when clearance exceeds 0.30 mm

No excessive wearClearance to impeller wear ring0.14 mm 0.22 mm

Measure-ment

Bore wear

Change seal ring when clearance exceeds 0.24 mm

No excessive wearClearance to casing slotDesign 0.06 mm 0.12 mm

Measure-ment

Side face wear

Remove using fine file and repolish or change seal ring

No galling or ridging

VisualGalling/ridging to side faces

Impeller seal ring

5



Check Reference

Check Method

Major Check Item

Description

No.





3

0

1

4

0

2

2

TURBINE MAIN OIL PUMP-CLEARANCE DRAWING

CLEARANCE ON DIAMETER0.14 0.22mm(MAX. ALLOWABLE 0.30mm)

CLEARANCE0.06 0.12mm(MAX. ALLOWABLE 0.24mm)

CLEARANCE0.06 0.12mm(MAX. ALLOWABLE 0.24mm)

CLEARANCE ON DIAMETER0.14 0.22mm(MAX. ALLOWABLE 0.30mm)

B-2 & I-123 5 of 5 Steam Turbine

Documents

extension shaftmaximum

hpip rotor shaftdeterioration

socket bolt21

cracksimpeller key3replace

specialist contractorsremove