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TECHNICAL OPERATIONPROCEDURE
Procedure No. LEPCL-KPS-O-MAW-M-ZM-030-R Revision No. 0
Title Operation Procedure for Gland Steam System
Section Position Name Sign / Date
Prepared UC Mr. M Danial Malick
Reviewed HOD
Approved PM
1x660MW Thermal Power Plant, Bin Qasim Town, Karachi, Sindh, Pakistan
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Procedure Revision/Validation Review History
Procedure Number: LEPCL-KPS-O-MAW-M-ZM-030-R
Procedure Name: Operation Procedure for Gland Steam System
Revision Number Date Revised Contents Approved by
0 Issue for use
-End-
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Table of Contents
1 Purpose ..................................................................................................................................................... 4
2 Scope ......................................................................................................................................................... 4
3 References ................................................................................................................................................. 4
4 Definitions................................................................................................................................................. 4
5 Procedure.................................................................................................................................................. 5
6 Interlock and Protection ......................................................................................................................... 7
7 Attachments .............................................................................................................................................. 7
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1 Purpose
o To show the sequential flow of instructions and procedures for Gland steam system operation
procedure.
o To guide operation personnel regarding Gland steam system start-up and stop procedures.
o Understand the permissive and protection trip for the gland steam system operation.
2 Scope
This procedure will be effective monitoring &Operating of Gland steam system.
3 References
3.1 LEPCL-10-MA_-BDC-200001-GO1 Turbine O_M Manual-A
3.2 LEPCL-10-MAW-MDB-300001-P01-B Steam Turbine-Gland Steam System-System Description
3.3 LEPCL-10-MAL-MFB-300001-P01 Steam Turbine-Steam and Drain System-P&ID
4 Definitions
4.1 Check Sheet
Check and measurement results for each component are recorded in this sheet.
4.2 Level of use
4.2.1 Continuous Use
This is for complex or infrequent works which could cause an immediate, possibly irreversible adverse
impact on safety, production, or reliability, due to improper action.
4.2.2 Reference Use
This is allowed for activities which do not bring immediate or irreversible impact on safety productivity
or reliability even when they are improperly done.
4.2.3 Information Use
This is for administrative works in nature as usual. They are neither directly connected with plant
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equipment nor affected by human error, and controllable within experienced individuals’ knowledge
and skills.
4.2.4 Gland steam system
The tasks of the gland steam system are to prevent.
o That air will draw into the parts of the turbine with a vacuum.
o That steam can escape from the shaft seals on the turbine sections and the spindle seals on the valves
in the machine room.
5 Procedure
5.1. Filling and preparing for running up
5.1.1. The gland steam condenser must be ready.
5.1.2. The condensate pumps must be ready.
5.1.3. Auxiliary steam line must be ready.
5.1.4. Auxiliary steam line is free of condensate.
5.1.5. Electric heater must also be ready.
5.1.6. The instrument air supply system must be ready.
5.1.7. The lubricating oil system must be in operation.
5.1.8. The turbine must be in turning gear operation.
5.1.9. All drain valves inside the turbine area are opened.
5.1.10. Condensate system must be in operation.
5.1.11. Auxiliary steam system parameters needed
Temperature >250°C
Pressure >600 kPa
Superheating >20K
Δ Temp Avg HP SHIFT- Aux St < 230K
OR
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5.1.12. Cold reheat steam system parameters needed
Temperature >300°C
Pressure >1.0 MPa
Superheating >20K
Δ Temp Avg HP SHIFT- Aux St < 230K
5.1.13. Gland steam admission valve must be closed.
5.1.14. Steam parameters needed for gland steam admission valve
Temperature >300°C
Pressure >1.0 MPa
Superheating >20K
5.1.15. Condensate system must be in operation.
5.2. Start procedure for gland steam system
5.2.1. Start gland steam condenser exhaust fan.
5.2.2. Open auxiliary steam isolation valve (10LBG30AA002).
5.2.3. Open gland steam admission valve (10MAW10AA111).
5.2.4. As soon as cold reheat steam parameters obtained, switch gland steam from auxiliary to cold reheat.
5.2.5. Warm pipe by opening the drain valve (10LBC50AA402).
5.2.6. Open cold reheat steam isolation (10LBG30AA002).
5.2.7. Close auxiliary steam isolation valve (10LBG30AA002).
5.2.8. Turbine speed must be < 150 revs/min.
5.2.9. Evacuation system must be switched off.
5.2.10. Vacuum breaker must be open.
5.3. Shutdown procedure for gland steam system
5.3.1. Reset operation mode memory of gland steam heater.
5.3.2. Set admission gland steam valve (10MAW10AA111) as well as gland steam dumping valve
(10MAW15AA112) control to manual and close.
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5.3.3. Set gland steam injection water control valve to manual and close (10MAW15AA111).
5.3.4. Close reheat steam isolating valve (10LBC50AA001).
5.3.5. Open reheat steam gland steam drain valve (10LBC50AA402).
5.3.6. Close auxiliary steam isolating valve (10LBG30AA002).
5.3.7. After 30 min switch off gland steam condenser fan.
6 Interlock and Protection
Item Condition
Temperature of the auxiliary steam drops below the minimum temperature of
Supply changes to 230°C
cold reheat form Steam supplied is only superheated by less than 20K
auxiliary steam Difference between the average rotor temperature and the gland steam
exceed230K
Gland steam
Gland steam pressure is exceeded 4.0 KPa
admission valve close
Admission valve is totally closed
Dumping valve open
Gland steam pressure is exceeded 8.0 KPa
LP casing cooling Normal temperature 200°C
system Alarm temperature 250°C
7 Attachments
7.1. Check Sheet
7.2. Equipment Technical Parameters
7.3. P&ID for Gland Steam System
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Attachment 7.1 Check Sheet
Check Sheet
Procedure No. LEPCL-KPS-O-MAW-M-ZM-030-R Rev. No. 0
Equipment Measurement Record Date& Time
Name Sheet No. Measured
Step Description Responsibility Check
The maintenance work has been completed, the work permit Field Operator
1. SBO
has been closed, the site is clean and tidy.
SIC
2. The gland steam condenser must be ready Field operator /
CRO
3. Condensate pumps must be ready Field operator /
CRO
4. Auxiliary steam header line must be ready Field operator /
CRO
5. Auxiliary steam line is free of condensate Field Operator
6. Electric heater must also be ready Field Operator
7. Instrument air supply system must be ready Field operator /
CRO
8. The lubricating oil system must be in operation Field operator /
CRO
9. The turbine must be in turning gear operation Field operator /
CRO
10. All drain valves inside the turbine area are opened Field Operator
Field operator /
11. Condensate system must be in operation
CRO
Auxiliary steam system
T >250°C
12. CRO
P>600 kPa
Superheating>20K
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ΔT AVG HP SHFT – Aux St < 230K
Cold reheat steam
T >300°C
13. P >1,0MPa CRO
Superheating>20K
ΔT AVG HP SHFT – CRH St < 230K
Field operator /
14. Gland steam admission valve must be closed
CRO
Steam for gland steam admission valve
T >300°C
15. CRO
P > 1.0/4.0MPa
Superheating>20K
Field operator /
16. Condensate system must be in operation
CRO
Start pre-selected gland steam condenser exhaust fan I = _____A
17. Check that the current of the motor, vibration, noise, outlet CRO Out P= ___ bar
pressure, bearing temperature of the pump set are all normal
18. Open auxiliary steam isolation valve CRO
19. Open gland steam admission valve CRO
As soon as cold reheat steam parameters obtained, switch gland
20. CRO
steam from auxiliary to cold reheat
21. Warm pipe by opening the drain valve CRO
22. Open cold Reheat steam isolation CRO
23. Close auxiliary steam isolation valve CRO
CRO: Shift in Charge:
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Attachment 7.2 Equipment Technical Parameters
SN Equipment Item Specifications
Model 7850.44407E.00
KKS code 10MAW30AC001
Gland steam Manufacturer HUBEI DEFON
1
condenser Flow rate (steam) 0.784 kg/s
Design temperature 350C
Design Pressure 1 bar
Model N/A
Equipment name Gland steam condenser exhaust fan
KKS code 10MAW30AN001/002
Manufacturer NANTONG XINHAI
Gland Steam
Capacity 2 X 100 %
2 Condenser
Rated power 15kW
exhaust fan
Rated Voltage 400V
Rated Frequency 50 Hz
Rated current 25.5 A
RPM 2947rpm
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