The circular issued by manufacturing units & other authorized  agencies  are included here.

TECHNICAL CIRCULARS

 LMW TURBINES - 210 MW

SR.NO

DESCRIPTION

DATE OF ISSUE

1

Pitting of the Journals of the Turbine rotors.

11.9.78

2 Mal-functioning of governing system 10.1.79
3 Coupling for Starting oil pump motor 29.3.79
4 Provision of diesel generating sets. at power stations           31.3.79
5 Mounting of eccentricity pick up.           24.4.79
6

Rolling of turbine through lPT during generator dry out (units having HP-LP Bypass).         

11.8.80
7

Increase in flange dia for steam supply of LPC sealing housing.

12.10.79
8

Protection of steam distribution elements during spray insulation.  

13.10.79
9 Seal steam temperature requirement           3.11.79
10

Assembly. of the pipe lines inside front bearing pedestals.      

 20.11.79
11

Proper fixing of elements which may enter into flow path

25.1.80
12 Babbit temperature of the bearings. 28.1.80
13 Supply of lubrication oil to bearings. 22.2.80
14 Checking of the float rotor in thrust bearing. 6.3.80
15

Adjustment of Cam and roller clearances of HP and IP control valves

6.3.80
16 IPC control valves 17.3.80
17 Fasteners in the high temperature zone 22.3.80
18 Suggested scheme for vapour extraction 8.6.80
19 Moisture in the turbine oil system. 24.6.80
20 Stiffening of barring gear pedestal. 26.5.80
21 Trip for high HPT exhaust temperature. 26.6.80
22

Change in location of 25 mm continuous drain of HPH-7 to HPH-6

26.7.80
23 Lubricating oil Temperature 28.7.80
24 Sticking of extraction NRV Servomotor. 30.7.80
25 NRV at MOP discharge 30.7.80
26 Turbine trip with boiler trip. 5.11.80
27 Control of negative differential expansions. 6.3.81
28 Seal welding of LPC vertical joints. 16.3.81
29

Generator front bearing Modification in jacking oil pipeline layout.

27-3.81
30

Low oil pressure in lub. oil header when D.C.pump is in operation.

18.4-81
31 Additional CRT for turbine bearings 8.5-81
32

Guideline for fixing RTDs in bearings for babbit  metal temp.measurement

5.6-81
33 Control valve servomotor. 10.6.81
34 Modification in gear coupling of MOP. 25-6.81
35

Modification for arresting loosening of cap nut of stud of IPC side control valves steam chest.

26-6.81
36 Cleaning of main oil Tank filters. 21.8-81
37 Seal welding of 2" plug in LPC exhaust parts. 25.8.81
38 Drain connection to flash tank 1.9.81
39

Oil leakage along worm of barring gear from hand wheel side.

29.6 81
40

Leakage of oil from end cover of Barring gear along the worm shaft.

25-6.81
41 Strainer of control valves 26 9.81
42 Fitting/thermal clearances of ESVs & IVs strainers 28-9.81
43

Clearance between double row roller radial spherical bearing & cam roller.

11.10-81
44

Slope on the face of M. O.P. Thrust Bearing (spare) (Drg. No. 32514002)-210 MW S. T.

30.1.81
45 Sticking of control valve (C.V.) No. 3 of H.P.T. 23.11.81
46 Clearances of Strainer of HPT CV No. 1 & 2 of H.P.T. 9.12.81
47

Mounting Accessories of HP, IP & LP Differential Expansion          Transmitter (Drg.  No. 3242800OC1 & 3141300OC-1).

6.2.82
48

Log sheet for fitting/Thermal clearances of steam strainers of ESV, IV & control valve,

11.2.82
49

Main oil tank (Drg.  No. 3241 OOOOC1/32430000-     Cl/3243800OC-l)-oil pumps suction.

20.2.82
50 Speed Governor (32523000) spare. 23.2.82
51

Plugging of 0 8 mm hole near front sealing in bottom half of HPT-21 0 MW ST.

19.3.82
52

Alignment between HP rotor and Main oil pump210 MW Steam Turbine (Refer Log sheet No. 0482-225)

29.5.82
53

Modification for arresting loosening of cap nut & stud item 6 & 8 drg. 321 7200OC- 1 ) at IPC side control valve steam chest amendment.

31.5.82
54 Change in brand name of turbine oil. 18.6.82
55

Interlock for jacking oil pump-210 MW ST. (USSR-Design)

27.6.82
56 Oil leakage through oil guard rings. 5.7.82
57 Check list to find out causes of frequent failure of cam rollers/bearings and/or Jamming of HPT C.V. No. 3 16.7.82
58

Check list jamming of H PT CV No-2) frequent failure of cam-roller/ beatings

59

Oil leakage through oil guard rings 200/210 MW. ST. (LMW)

20.7.82
60

Corrigendum to O&M instructions Vol-II (Maintenance Manual). (Ref. page 34)

20.7.82
61

Gear coupling between HP rotor & Main oil pump of 200/210 MW.  Steam Turbines

3.9.82
62

Regulating stage liner of 210 MW.  S.T. Drg No.3212000OC-1

22.12.82
63

Checking of strainers of top control valves of HPC 200/210 MW.  Steam Turbines

16.2.83
64

Modification in the “Toothed housing” (Drg.  No.3251 5002 Rev.  C) of Gear Coupling.

18.2.83
65

Drain holes to avoid accumulation of condensed steam in the bottom halves of gland sealing chambers of LPT (Drg No. 32207020) : 200/210 MW.  ST. (LMW. design)

21.3.83
66

Locking of nuts of the HPR-Emergency Governor coupling 200/210 MW.  S.T. (LMW Design)

21.3.83
67

Proposed common header scheme for rotor heating of 200/210 MW.  ST. (LMW design) for arresting diff Exp. of HP&IP rotors.

21.3.83
68

Proposed common header scheme for rotor heating of 200/210 MW steam turbine

18.3.83
69

Provision of chamfer in regulating stage liner (drg No. 32130000) : 200/21OMW Steam-Turbine (LMW design)

70 Sticking of Electro magnet of Turbine shut down switch 26.4.83
71

Locking of “Slotted” round nut (M42X3) with the help of stop washer provided for locking of semi coupling (item 1 of  drg. 3251500OC-1) on torsion shaft of M.0.P. rotor.

14.5.83
72 Proper mounting of carbon brushes. 14.5.83
73

Listening the rattling sound of strainers of control valve No 1 or 2 of H PT. of 200/21 0 MW.  ST. (LMW design)

30.5.83
74

Proper fitting of special nut or castle nut at the top portion of control valves (C.V.) of H PT & I PT  200/210 MW. ST (LMW design)

20.6.83
75 Dowelling of IP nozzle segment with cylinder. 15.9.83
76 Operation Instructions for 200/210 MW.  ST. (LMW Design)       21.9.83
77 Installation of orifices : Flange & stud heating chamber 28.9.83
78

Periodic Testing of healthiness of “Turbine shut-down switch” (T.S.D.) : 200/210 MW Design)

28.12.83
79

High Negative Differential Expansion of IPT  200/210 MW. ST. (I-MW Design)

26.12.83
80 H.P. Control valve No 2 of 21OMW ST. 29.12.83
81

High Negative differential Expansion (D.E.) of  IPT 200/21 0 MW (ST) (LMW) Design

31.12.83
82

Heating of steam admission Pipelines from  (IV) to C V of IPT 200/210 MW. ST.

12.1.84
83

Interceptor valve Steam Chest Cover : 200/210  MW Steam Turbines (LMW Design)

29.3.84
84

Failure of main oil pump (MOP thrust bearing  200/21 0 MW Steam Turbines (LMW Design)

20.4.84
85 Check List of Mop Bearing Failure
86

Procedure for assembly of strainers in top control valves of HPC (Drg No. 3211700OC-1)

8.5.84

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