Doc. No.

: GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

Gujarat State Petroleum Corporation Ltd

Deen Dayal Field Development Project

Standard Operating Procedure

Onshore Gas Terminal(OGT)

Mallavaram

Title : Gas Turbine

BHEL Make Model : PG5371PA

Document Number : GSPC-OGT-CPP-SOP-001

Document Preparation and Approval Details:

Revision Date Prepared by Reviewed By Approved By

RB Singh
Vice President
Ramakrishna Maintenance
Asst.Manager -Inst
N. Bose Babu
( Shiftincharge )
0 20.01.2015 Asset in Charge, Kakinada
Vimal Gupta
Asst.Manager- Inst.Maint Nitin Bartakke

Assoc. Vice President

CPP In charge

Document Amendment Details:

Revision Date Section Page No’s Modification / Comments
0 N/A N/A N/A New Issue

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

INDEX
INDEX

Section no. Content Page no.

Index 2
1 Purpose / Scope 3
2 HSE Considerations / Requirements 3
3 Abbreviations & Definition 3
4 Key Responsibility 4
5 Procedure 5
6 References 19
7 Records 19

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

1. Purpose / Scope :

A Standard Operating Procedure (SOP) is a written set of guidelines to perform the Operation activity of
Equipment or System in effective manner to ensure safety and reliability of equipment or system.

This document is to gives precise information about the Operating procedure to be followed for Operation
of the Gas Turbines of OGT in an effective and safe manner and to meet the optimum standards of
operational reliability and continuity.

In OGT Facility 2 No’s of Gas turbines of BHEL make installed at CPP.

General design data :

Model series : MS5001.

Model no. : PG5371PA.
Machine no. : GT226 & GT227.
Cycle : Cogeneration.
Shaft rotation : Counter clockwise.
Turbine shaft speed : 5100 RPM.
Compressor Pressure ratio : 10
Output : 21.6 MW ( Base ).
Design (site ) conditions : 38 ° C ambient @ 74% RH at a altitude 5m above MSL.
Fuel : Natural gas.

2. HSE Considerations:

1. Material Safety Data Sheet (MSDS) is to be displayed in the operational area.

2. PPE (Personal Protective Equipment) are mandatory for operation and maintenance team.
3. Permit to work system to be strictly followed for any jobs to be carried out.
4. Ensuring healthiness of fire suppression systems provided at various locations.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

3. Abbreviations & Definitions :

i. PPE : Personal Protective Equipment.

ii. GT. : Gas Turbine
iii. HRSG : Heat Recovery steam Generator
iv. MCR : Maximum continuous rating operation
v. BDV : Blow Down Valve
vi. FSNL : Full speed No load
vii. SRV/GCV : Stop Ratio Valve/Gas Control Valve
viii. LVDT : Linear Variable Differential Transducer
ix. IGV : Inlet Guide Vane
x. LEL : Lower Explosive Limit
xi. MSDS : Material Safety and Data Sheet.

4. Key Responsibility :

A) Shift In-charge of CPP operation:

 Shift In-charge of CPP operation is responsible for effective and safe Operational activities of
the plant.
 To monitor the activities of team and to ensure effective utilization of shift man power.
 To ensure timely issuance and closure of permits as per job requirement.
 To ensure compliance of all safety norms and guidelines.
 To maintain and record equipment parameters, preparation of shift reports, incident
reports ( if any ) etc.,
 To assist and guide panel operators.
B) Shift Electrical engineer of CPP Operation:
 Shift Electrical Engineer of CPP operation is responsible for readiness of electrical system,
synchronization .
 To manage safe and effective switch gear operations .
 To ensure the healthiness of battery chargers, UPS, Batteries, Field drives and all other
electrical systems with the support of contractual O&M team.
 To assist CPP Shift In-charge in day to day activities.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

C) Control room & field operators of O&M Contract:

 Control Room & Field Operators of O&M Contract are responsible for identifying field
observations
 To monitor and control the field parameters including the electrical equipments in switch
gear room and also to check all the parameters within the operational limits.If any abnormal
found the same to be inform to the respective Shift-In charge
 To closely monitor the parameters during startup of any equipments.
 To visit gas skid and all the compartments in gas turbine in shift for monitoring any gas leak
using LEL detectors and inform the same to the respective Shift-In charge immediately.
 To ensure compliance of all safety norms and guidelines.
 To ensure the usage of appropriate tools and tackles.
5. Procedure :

Startup Checks:

The following check sheets are to be duly filled after thorough checks before startup by the shift team
and signed by respective Shift In-charge and maintenance in charge for ensuring the equipment
availability for safe and effective operation of the plant.

a) Checksheet for Lineup & ensuring healthiness of following systems.

 Electrical System Readiness.

 Auxiliary Cooling Water System Charging
 Ratcheting
 Gas Skids Lineup
 GT Pre start Checks
 Co2 Flooding System
 HC Gas Detector System
 Accessory Compartment
 Turbine Compartment
 Load Gear & Exciter Compartment
b) Startup Permissives

c) Startup Sequence

Check sheet for Electrical System Readiness :

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

Please tick( √ ) on the status and ensure the selection mode of feeders in “Auto” position.

GT- 01 / 02 ELECTRICAL FEEDER STATUS

S FEEDER FEEDER Auto/ ON
TAG DESCRIPTION REMARKS
NO LOC NO Manual Status
125VDC
1 4FA 88DS-1 Diesel Engine Starting Motor      
2 2FB 88QE-1 Emergency Lube Oil pump (EOP)      
125VDC
3 DB 1FA 88HR-1 Hydraulic Ratchet Pump      
Mark VI e 125VDC supply to Mark VI e Control
4 1FB Panel Panel      
415V GT MCC
4 4FE 88QA-1 Auxiliary Oil Pump (AOP)      
5 2FD 88HQ-1 Auxiliary hydraulic Oil Pump (AHOP)      
6 9FD 88QV-1 Lube oil mist eliminator-1      
7 9FE 88QV-2 Lube oil mist eliminator-2      
8 4RC 88BA-1 Accessory Compt Cooling Air fan Mtr-1      
9 7RF 88BA-2 Accessory Compt Cooling Air fan Mtr-2      
10 6RA 88BT-1 Cooling Air fan Turbine Compt-1      
11 6RE 88BT-2 Cooling Air fan Turbine Compt-2      
12 5RC 88VG-1 Load Compt Cooling Air Fan Mtr-1      
13 5RD 88VG-2 Load Compt Cooling Air Fan Mtr-2      
14 8RB NA Generator Space Heater      
15 6FC 23 QT-1 Lube Oil Tank Heater      
16 7FF 23 TW-1 Water Wash Heater-1      
17 GT MCC-1 5RA 23 TW-2 Water wash Heater-2      
/
18 6FA 23 TW-3 Water Wash Heater-3      
88 QFD-
GT MCC-2 Diverter Damper Seal Air Fan Mtr-1
19 3FB SAF-1      
88GFD-
Diverter Damper Seal Air Fan Mtr-2
20 4FC SAF-2      
21 4FA 88 WN-1 Water Injection System      
88 GD-
Guillotine Damper Seal Air fan Mtr-1
22 5FB SAF-1      
88 GD-
Guillotine Damper Seal Air fan Mtr-2
23 5FC SAF-2      
88 GD-
Guillotine Damper Gate Valve Motor
24 7FB GV-1      
25 7FC 88GD-BFV Guillotine Damper BFV Motor      
88GFD- Diverter Damper Gate Valve for
26 8FB GV-1 sealing towards bypass stack.      
27 8FD 88 GFD- Diverter Damper Common BFV for      

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

BFV seal air fan

Offline Water Wash Solenoid Valve
28 2RC 20 TW-1 MCB:54-1      
Online Water Wash Solenoid Valve
29 2RC 20 TW-3 MCB:54-5      
Water Injection Stop Solenoid Valve
30 2RC 20 WN-1 MCB:54-6      
31 4RB 88 TW Water Wash Pump Motor      
32 6RC 88 DM Detergent Pump Motor      
33 7RB 88 GD-1 Guillotine Damper ACT Motor      
34 8RD   Guillotine Damper LCS MCB:54-2      
35 8RD   Diverter Damper LCS MCB:54-3      
36 8RD   Co2 Panel MCB:54-8      
37 9RB 88GFD-1 Diverter Damper ACT Motor      
88GFD- Diverter Damper GATE VALVE for
38 9RC GV-2 sealing towards HRSG.      
39 9RD 125VDC GT Battery Charger Fdr-02      
BOP MCC
81-FM-08-
40 13FE FRP Cooling Tower fan
50
PMCC-2
41   8FA   Cooling water Pump For Black Start      
UPS SUPPLY FOR IGNITOR
42   5R3/F58   110VAC Ignitor supply for GT-1      
43   6R1/F59   110VAC Ignitor supply for GT-2      

Check sheet for Auxillary Cooling Water System Charging :

Please tick( √ ) on the status.

Activity Status Remarks

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

During initial startup with Black start cooling system, Black start cooling
water line up valves in open.
Lube Oil Cooler Cooling water inlet valve is Open
Lube Oil Cooler Cooling water Outlet valve is Open
Diesel Engine Cooling Water inlet valve is open
Diesel Engine Cooling Water outlet valve is open
Generator Cooling Water inlet valve is open
Generator Cooling Water outlet valve is open
Flame Detector Cooling Water inlet valve is open
Flame Detector Cooling Water outlet valve is open
Check for water leaks in accessory compartment (L.O Cooler & Starting DE),
Turbine Compartment ( Flame scanner ), Generator Air Cooling Area.
During Ratcheting :

Activity Status Remarks

GT Lube oil ( L.O) tank Dip level should be 480 mm ( Low :390mm, High :
566mm )
Mist Eliminator Filter inlet valve is open
Mist Eliminator Filter outlet valve is open
One Mist Eliminator Fan inlet valve is open (Ensure the standby fan inlet
valve is closed.)
One Mist Eliminator Fan outlet valve is open (Ensure the standby fan outlet
valve is closed.)
Oil Mist Eliminator oil Drain Line isolation to Lube oil Tank is in open
condition(Location: Accessory Compartment)
GT AOP is Running
L.O Leakages status in Bearing1, Accessory Gear Box, L.O Filter , L.O Cooler ,
Coupling Oil Filter, Trip Oil Filter , Gauge Cabinet
( Location : Accessory Compartment )
L.O Leakages status in Bearing2, Load Gear Box, Coupling
Guard,GeneratorBearing1.( Location :Load Gear Compartment )
L.O Leakages status in Generator Bearing2, ( Location :Exciter Compartment
)
AOP is healthy(Ensure that there is no abnormal Noise, vibration )
Jaw Clutch Status should be engaged
Ensure physical ratcheting is being done in accessory compartment.
Oil mist Eliminator fan is running
Oil Mist eliminator fan is healthy(Ensure that there is no abnormal Noise,
vibration )
Check AOP discharge pressure is 4.5 Kg/Cm2
Check L.O Header pressure is 1.8 Kg/Cm2
Check L.O Filter DP is less than 1 Kg/Cm2.
Check Coupling Filter DP is less than 1 Kg/Cm2.
Check sheet for Gas Skids Lineup :
Please tick( √ ) on the status.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

Activity Status Remarks

Ensure DCS is working.
Ensure spectacle blinds for Nitrogen are oriented in open position to
charge Nitrogen.
Ensure the BDV’s of all skids are in closed position
Ensure the upstream isolation valves of all BDV’s are in closed position.
Ensure the drain control valves of all skids are in closed position
Ensure the upstream isolation valves drain control valves of all skids
are in closed position.
Open the upstream & downstream isolation valves of spectacle blinds
in Nitrogen lines in the respective skids & charge till 5 Bar.
This activity is to be
Close the upstream & downstream isolation valves of spectacle blinds
done during skid
in Nitrogen lines in the respective skids.
maintenance job &
Ensure spectacle blinds for Nitrogen are oriented in closed position.
which requires
Charge the gas by opening the isolation valves of respective skids.
Nitrogen purging.
Open the upstream isolation valve of BDV, downstream isolation valve
of BDV, BDV (Location of downstream of ESD for respective
GT).Nitrogen is vented to the flare.
When the upstream pressure of ESD is around 7 Bar, close the
upstream isolation valve of BDV, BDV. ( Ensure downstream valve of
BDV is in open condition )
Open the battery limit isolation valve further to increase the pressure
to 10 bar.
Check for Gas leaks using Portable Gas Detector (LEL Meter).

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

If no leaks observed, open further battery limit isolation valve to increase

pressure up to 40 bar & check for leaks.
If no leaks observed, open full open battery limit isolation valve to increase
pressure up to 50 bar & check for leaks.
Maintain 40 bar in the downstream of HP to LP PRS by manually adjusting
the control valve.
Maintain gas pressure of 20 bar in the downstream of LP to fine filter PRS
Line-up HRSG PRS & maintain gas pressure of 5 bar in the downstream of
HRSG PRS to supply gas to Flare.
Open the Manual Isolation valve (6” Ball Valve).
Ensure the Y –Strainer vent line isolation valves are closed Activities considering
Location : Accessory Compartment gas is charged up to the
Ensure Gas condensate Drain Tank level is low. GT.
Line-up Gas Condensate Drain Tank pump to Slop Tank if the level is high.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

Check sheet for GT Pre start :

Please tick( √ ) on the status.

Co2 Flooding System

Activity Status Remarks
Ensure all CO2 Cylinders are in Hanging position (This ensures Zone 1 – Accessory &
cylinders are filled ) Turbine Compt.
Ensure Lock out valve position is in open condition Zone 2 – Generator
Ensure all doors of CO2 Panel are closed. Compt.
Ensure CO2 EPB glass are intact ( Not cracked ) – 7 No’s GT Area
Ensure No alarm persist on CO2 module in control room CO2 Panel and “System Co2 Panel in control
normal” is displaying on module room
HC Gas Detector System
Ensure LEL value of Gas detector for channel-1 is ZERO. Location : SRV/GCV
assembly
Ensure LEL value of Gas detector for channel-2 is ZERO Location : SRV/GCV
assembly
Ensure LEL value of Gas detector for channel-3 is ZERO
Ensure LEL value of Gas detector for channel-4 is ZERO
Also ensure the value of LEL of channel-1 is ZERO after Gas is charged up to
SRV/GCV.
Also ensure the value of LEL of channel-2 is ZERO after Gas is charged up to
SRV/GCV.
Accessory Compartment
Activity Status Remarks
Ensure L.O level of Starting DE is between L & H mark using Dip stick.
Fill the Expansion water Tank till water overflows from the overflow tube.
Ensure Diesel Tank level of Starting DE is between 1/2 & 3/4. Tank Capacity: 380 lts.
Ensure AOP is in Remote Selection in the Local Push Button Station
Ensure AHOP is in Remote Selection in the Local Push Button Station
Ensure Accessory Compt Vent Fan 1 is in Remote Selection in the Local Push Button
Station
Ensure Accessory Compt Vent Fan 2 is in Remote Selection in the Local Push Button
Station
Accessory Compartment Vent fans damper dead weight should be hanging in
position.
Ensure Co2 isolation valve for Damper closing mechanism is open. ( Location : On
top of Accessory Compt at Vent fan )
Ensure L.O flow in the sight glass of return line of turbine bearing 1.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

Turbine Compartment
Activity Status Remarks
Ensure Flame Detector Isolation Valves are in Open Condition
Ensure Compressor Discharge extraction (17 th Stage) air line isolation valve
for Bleed Valve actuation is in open condition.

Ensure Compressor Air extraction (11th Stage) air line isolation valve for
Bearing Sealing is in open condition.

Ensure CPD Tx isolation valve on Air Compressor is open

Ensure the spindle position in the bleed valve is inside the spindle housing.
( For Bleed valve Open Condition Status )
Ensure Turbine Compt Vent Fan 1 is in Remote Selection in the Local Push
Button Station
Ensure Turbine Compt Vent Fan 2 is in Remote Selection in the Local Push
Button Station
Turbine Compartment Vent fans damper dead weight should be hanging in
position.
Ensure Co2 isolation valve for Damper closing mechanism is open. ( Location
: On top of Turbine Compt at Vent fan )
Load Gear & Exciter Compartment
Activity Status Remarks
Ensure L.O flow in the sight glass of return line of generator bearing 1
Ensure L.O flow in the sight glass of return line of turbine bearing 2.
Ensure L.O flow in the sight glass of return line of Coupling Oil.
Ensure L.O flow in the sight glass of return line of generator bearing 2.
Ensure Load Gear Compt Vent Fan 1 is in Remote Selection in the Local Push
Button Station
Ensure Load Gear Compt Vent Fan 2 is in Remote Selection in the Local
Push Button Station
Load Gear Compt Compartment Vent fans damper dead weight should be
hanging in position.
Ensure Co2 isolation valve for Damper closing mechanism is open. ( Location
: On top of Load Gear Compt at Vent fan )

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

b) Startup Permissives. :

“READY TO START” status in GT Mark Vie will be available only when all the following start
checks are satisfied.
Note: Signals in the proper start to permit a start are shown in GREEN.
A GREEN signal is required to start the unit.
Signals which are RED inhibits start request.

Sl.No Details of Start Checks Inference

1 Start Checks-0
Condition is generated when difference
A. Compressor Inlet TC Fault - L86TCI between two inlet air T/C ‘s – CTIF1 & CTIF2
is more than 25°F ( -3.88°C)

Provision given by OEM to include customer

B. Customer Permissive to Start-L3CP requirement logics. (Presently kept Forced
as no extra logics are added).

Emergency Push Button on Mark Vie panel

C. E-Stop Push Button State – L5ESTOP1. should not be pressed.

Timer of 1000millisecs which ensures that

D. Master Protective Startup Lockout-L86MP machine cannot be started immediately
after any trip

E. MCC Voltage Normal-L27MC1N GT MCC Bus voltage is Normal. Input taken

from GT MCC Bus.

IGV Fault Alarm is generated under the

following conditions
F. IGV Fault- L3IGVFLT a) IGV LVDT is showing <41°C.
b) IGV Servo current <-30Ma.
c) If difference between IGV Actual &
IGV Reference is more than 7.5°
with a time delay of 5000millisecs.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

G. Multiple Starts Permissive – L2FZ Timer is set at 15 secs for start command.

This permissive is to ensure all controllers

H. Control System Fault- L3SFLTSC
are in controlling state & controller’s
heartbeats should be running.

I. Lube Oil Tank Temp Normal-L26QN L.O tank temperature should be more than
10 °C.

Trip Relays – 86U & 86G in GTG Relay Panel

J. GRP Healthy For GT Startup-L86N
(R-2) should be reset.

Start Checks-1
Mode selection in Main Screen should not
a. Control Mode OFF-L43O be in OFF mode (It should be either
CRANK/FIRE/AUTO).

No flame should be detected in either of

b. Flame Detector Trouble-L28FDSCK
flame detectors. ( Value should be 0 Hz )

In the Diesel SM Screen, STOP should be

c. Diesel test Mode selected-L83DT selected.

Overload protection in Ratchet Pump Motor

should not be picked.
d. Ratchet Pump Motor Overloaded-L49HR1A

Starting DE stop valve should be in open

e. Diesel stop valve Solenoid Open-L20DVX condition. ( L20DVX should be in
deenergised condition)
GT generator Breaker feedback should be in
f. Generator Breaker Tripped-L52GX OPEN condition.

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Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

Start Checks-2 There are 5 groups for vibration monitoring.

Group 1 : BB1 & BB2 – Turbine Bearing 1
Group 2 : BB4 & BB5 – Turbine Bearing 2
Group 3 : BB10 & BB11 – Gen.Bearing 1
a. Vibration start Inhibit-L39VD3 Group 4 : BB12 & BB13 – Gen.Bearing 2
Group 5 : BB7, BB8,BB9 – Load Gear Box
If both probes in any group are unhealthy, it
will inhibit the startup permissive.
If one probe is healthy, it will give
permissive.

The status of this permissive should be in

GREEN. If it is RED it indicates Master
b. Loss of Master Protect trip time delay-L4Y Protection Signal –L4 is unhealthy.

Master Protective trip is the master

integrator of the following individual trip
logics :
a. L4PST – Protective Status Trip Logic
c. Master Protective trip-L4T b. L4PRET –Preignition Trip
c. L4POST – Post Ignition Trip
d. L3SMT – Starting Device Trip
e. L4IGVT – IGV Control Trouble Trip
f. GT STOP
Note: If any of the above trips is persisting,
L4T status will be unhealthy.

Both compressor bleed valve position

should be open. ( L33CB1O & L33CB2O)
d. Compressor Bleed valve Trouble-L86CB

Machine should be in Zero speed.

e. HP Turbine zero speed-L14HR
The picked status indicates that trip oil low
pressure switches are in picked condition &
f. Hydraulic Protective trouble-L86HD Loss of Master Protective Signal - L4Y

If two CPD Tx’s out of existing three Tx’s are

Start Checks-3 faulty it will inhibit startup.
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Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

a. Compressor Dish Press Flt-L3TFLT

All pack communication in hardware cards
Start Check Logic L3RS should be healthy.
a. All pack status OK L3COMM_IO
All above Start Checks – 0,1,2,3 should be
healthy.
b. Start Check L3STCK
GCV, SRV, LVDT servo valves should be
healthy.
c. Auxiliary Check Servo’s L3AGS

c) GT Startup Sequence. :

i. Following selection in GT Mark VI e main screen to be done.

a. Mode Select : AUTO & give Execute Command ( Status is changed from
OFF COOLDOWN to READY TO START )
b. Governor Mode : Droop
c. Cycle Selection : Simple
d. Load Select: Not Required.
ii. On giving “START” EXECUTE command the following is initiated :
a. AOP (Auxiliary Oil Pump) is started.
b. Jaw clutch solenoid 20 CS-1 energized.
c. Jaw clutch engages
d. Hydraulic ratchet pump starts.
e. Master protective system circuit is energized (L4).
f. AHOP (Auxiliary Hydraulic Oil Pump) starts.
g. Diesel engine solenoid valve (20DV) is deenergized ( Valve is open ).
h. Diesel engine starting motor (88DS) starts for 5 sec.
i. Diesel engine starts.
j. Diesel engine reaches idle speed 700-900 rpm.
k. Diesel warm up timer T2DW starts (120 sec.)
l. Hydraulic ratchet start continuous ratcheting.
m. Turbine rotates along with engine & an L14HR drop out (Turbine Breakaway from
Zero speed) happens, fuel gas vent valve solenoid 20 VG-1 energized.
n. After completion of DE warm-up timer T2DW of 120 secs, Diesel engine accelerating
solenoid (20DA-2) is energized for 20 secs & diesel engine accelerates up to 1900
RPM .After 3 secs of deenergisation of 20 DA2, 20DA-1 energized and holds diesel
engine RPM speed to 1300 to 1500 rpm.
o. Starting clutch solenoid 20CS-1 is de energized; jaw clutch is engaged by torque of
diesel engine.
p. Hydraulic ratchet pump stops.
q. Turbine accelerates to min. firing speed (Cranking speed L14HM picks up).

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

r. Turbine purge timer T2TV starts for 5 minutes.

s. After completion of purge timer, turbine firing (T2F) starts for 60 secs.
t. Both spark plugs energized as command for ignition transformer goes for 30 secs.
u. FSR is set to firing value. FSKSV-FI (19.5%).
v. IF no flame is detected in both scanners with in firing timer (T2F).Turbine will trip
generating failure to ignite alarm.
w. If both flame scanner detects flame with in firing timer, FSR is set to warm up value
FSKSU-WU (14.5%) & turbine warm up timer (T2W) starts for 60 secs..
x. After completion of warm-up timer, Starting Diesel Engine solenoid 20DA2 is
energized & 20DA1 is deenergized resulting in full speed of 1900 rpm of DE. On
completion of warm up timer, FSR is increased to acceleration limit FSKSU-1A. (This
value is limited by speed & temp. control)
y. Turbine compt vent fan & load gear compt vent fan in lead mode starts.
z. At 51% speed, L14HA pick up indicating Turbine is on acceleration.
aa. Jaw clutch disengages at 65% speed.
bb. Diesel engine solenoid 20DA-2 de energized.
cc. Diesel engine runs at idle speed of 700-900 rpm for 5 minutes
dd. After completion of 5 mts, 20DV is energized & stops Diesel Engine.
ee. At Turbine speed of 80%, IGV opens from 42° to 57°.
ff. At 95% speed L14HS picks up (Operating speed) & both compressor bleed valves get
closed
gg. AOP & AHOP stops.
hh. Full Speed No Load is achieved ( FSNL) and machine is ready for synchronising.
Procedure for synchronization:
1. Ensure excitation is ON . Check the generator terminal voltage (11kV).
2. In 11 kV HT panel GTG Breaker Local/Remote switch should be in Remote Position.
Synch through Mark Vie:
3. Ensure in Mark Vie, Auto/ Remote selection in Auto. Mark Vie will automatically
give the close command to the GTG-2 Breaker.
Synch through SCAP Panel:
4. Ensure that in Mark Vie, Auto/ Remote selection in Remote. In SCAP panel further
there is a control selection switch of SCAP/ECS. It should be in SCAP.
5. Connect the sync trolley in the GTG- Breaker Socket and switch ON the Synch
trolley.
6. Place the Auto/Manual DB switch in Auto and wait for the 12’0 Clock in
Synchroscope and give Synch Command. GTG- breaker will be closed.
Synch through ECS:
7. Ensure that in Mark Vie, Auto/ Remote selection in Remote. In SCAP panel further
there is a control selection switch of SCAP/ECS. It should be in ECS.
8. Double click the breaker icon on HMI and Click the Select button followed by Check
button then start the Auto synchroniser. ECS will automatically give the close
command to the GTG- Breaker.

d) Activities after FSNL. :

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

1. Once the GT breaker is closed on dead bus and GT power is restored, C losure of
incomers of PMCC should be done after synchronizing with Black start DG.
2. On restoration of normal power supply to GT MCC the remaining drives being fed
from GTMCC will be connected and started.
3. The restoration of cooling water system is envisaged manually.After normalization
of cooling water system by process and after getting required pressure (5 Kg/cm2),
Main cooling water valves to be opened. And after ensuring the normalcy of the
system, Emergency cooling water system ( Black start cooling system ) can be shut
down by locally or through DCS and manually closing the black start line up valves.

iii. Control Room Engineer to note down & monitor all following parameters during startup and
normal operation of gas turbine.
 Turbine operating data
 Gas fuel system
 Exhaust temperatures.
 Bearing metal and lube oil drain temperatures.
 Wheel space temperatures.
 Turbine compartment temperatures.
 Vibrations ( Siesmic )
 Vibrations ( Shaft )
 Flame intensity.
 Lube and hydraulic oil pressure
 Auxillary and electrical system in service.
 Water injection system.
 Generator data and winding temperatures.

iv. Field Engineer to check for oil leakages, abnormal sound, flue gas leakages during startup.
v. Field Engineer to check for gas leakages using Portable LEL meter in accessory & Turbine
compartment during startup.
vi. Field Engineer to note down & monitor all following parameters during normal operation of gas
turbine.
 Fuel gas conditioning skid pressure and temperature.
 Cooling water system parameters.
 Diesel tank and Lube oil tank levels.

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 Doc. No. : GSPC-OGT-CPP-SOP-001
Gujarat State Petroleum Corporation Rev. No. : 00
Limited Issued : 20.01.2015
SOP for Gas Turbine Startup

6. References :

BHEL GT operation and maintenance manuals of volume A-1, A-2, A-3,A-7.

Agnice fire system manual.
Logics in MarkVie ToolBox ST.

7. 7. Records :

a. Gas Turbine Log Sheet ( Field )

b. Gas Turbine Log Sheet ( Control Room )

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