Turbine cold startup
Checks before start-up
1.
If Turbine is tripped for more than 72
Hrs & flange temperature Less than 40°C then cold rolling to be done
depending upon the criteria’s as mentioned this SOP
2.
Ensure no permit to work is
pending
3.
No man is working on any equipment.
4. Ensure that the main power supply
and control power supply of all motorized valve is healthy.
5.
Ensure that all HT motors megger value is normal.
6.
Ensure the Turbine Generator is
ready to put into Service.
7.
Take clearance from
Respective Departments.
8.
Ensure that anyone Boiler is
in Service & Steam is charged up to MS-04.
9.
Ensure Lube oil Tank level
>60%
10.
Ensure that the TG is in
barring & rotating at 80 to 85 RPM.
11.
Ensure Control oil Tank level
>60%
12.
Ensure One CEP is in service
13.
Ensure that MS-04 before the drain is open.
14.
Ensure CCW & ACW pumps
are in service.
Permissive for start-up
1.
All Fan Start permissive
coming from MCC.
2.
Any Bearing temp. Not very
high (< 90oc).
3.
Motor winding temp. Not very
high (< 125oc).
4.
Hot well Level normal (>275 mm).
5.
Deaerator level normal
(>1250 mm).
6.
Emergency local push button
to be released in T.G Desk.
Operating Procedure.
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§ Release condition for the Start SFG oil system.
§ Ensure
Lube oil tank level >min. (60%).
§ Ensure
DCEOP no MCC failure.
§ Ensure
Control oil tank level >min. (60%).
§ Ensure oil heater in an auto.
§ After checking the Release SFG oil system gives
ON command to it.
§ Preselected
oil vapor extraction fan is on.
§ When
oil temperature >10°C DCEOP on.
§ When
lube oil pressure >0.9bar DCEOP off.
§ Preselected
Auxiliary oil pumps on.
§ Preselected
control oil pump on.
§ Preselected
control oil recirculation pump on.
Start Turning gear.
§ Release
condition for Start FG Turning Gear.
· Ensure Lube oil pressure >
1bar.
§ Turbine axial shift < ± 0.6mm.
§ Ensure
DC EOP/AOP is a running condition.
§ Ensure
AC JOP not in local.
§ After checking the Release SFG Turning gear
gives ON command to it.
§ DC JOP on
§ Turning
gear auto on.
§ AC
JOP on & DC JOP off.
Start CEP
§ Release
condition for Start SFG Condensate Unit.
§ Ensure
Hot well level >75mm.
§ Ensure
CEP 1 & 2 suction strainer drain & vent closed.
§ Ensure
CEP 1 & 2 canister vent to condenser manual valve open.
§ After checking the Release SFG Condensate unit
gives ON command to it.
·
Ensure the SJAE vent valve opens.
§ Ensure
Hot well level control valve in an auto.
§ Ensure
SJAE valve 1 or 2 open.
§ Ensure
CEP 1 & 2 suction valve open.
§ Ensure
CEP 1 & 2 solenoid valve to discharge header drain open.
§ Preselected
CEP is on.
§ CEP
discharge valve open.
·
Ensure the SJAE vent valve close.
Turbine Rolling Procedure Manual
Steam Charging to Auxiliary Steam & Gland Sealing:
- Ensure that Both Auxiliary Lines after
control valve manual valves are open.
- Ensure that preselected Auxiliary drains
are open.
- Ensure that Both Auxiliary Lines spray
control valve after & before manual valves are open.
- Auxiliary Steam Controller get ON at
Main Steam Pressure > 70 Kg/cm2 & Temperature >470°C
- After checking the Release is SFG
Auxiliary Steam gives ON command to it.
- Gradually Increase the Pressure of
Auxiliary header to 11 to 13 kg/cm2 & control the temperature 250°C.
- Auxiliary Steam pressure &
temperature controller kept in auto mode at pressure set point 11Kg/cm²
& temperature set point 250°C.
- Throttle the drains if required
temperature is achieved.
- Manual isolation before & after
Gland sealing control valve open.
- Drain valve before & after Gland
sealing control valve open.
- Bypass MOV of Gland sealing supply
control valve close.
- Ensure Sealing Steam TG LP side drain
open.
- Ensure GSC drain open to atmosphere
& close to condenser.
- Ensure SFG Drains is ON & Turbine
speed ≥ 4 rpm
- Sealing Steam Controller gets ON at
Temp>295°C & Pressure>7 Kg/cm2
- Ensure Difference of Inner casing Temp
& Sealing supply Temp ≤ 80°C.
- After Checking the release of SFG Gland
sealing give ON command to it.
- Gradually Increase the Pressure of gland
sealing to 50gm/cm2 & control the temperature 230°C
- Throttle the drains if required
temperature is achieved.
- Sealing Steam Pressure & temperature
controller kept in auto mode at pressure set point 50 g/cm² &
temperature set point 250°C.
VACCUM PULLING & HPBP Charging:
a.
Ejector line second stage
drain is through to condenser.
b.
Ejector second stage drains
to the atmosphere for both ejectors are closed.
c. The main ejector & starting
ejector steam valve is closed.
d. The air valve of all the ejectors is
closed.
e.
Vacuum breaker & its
manual isolation valve are opened.
f.
Ensure Condensate Inlet &
outlet valve of both ejectors is opened & the bypass valve is closed.
g.
Release condition for SFG
Evacuation is Auxiliary steam Press>10 Kg/cm2, SFG Ejector 1&2 Off &
SFG Sealing steam ON.
h.
Select the Ejector group in
FG.
i.
Give ON command to SFG
Evacuation.
j.
Starting Ejector motorized
valve will open at the meantime Auxiliary steam CV to be increased to maintain
the Aux. Steam header pressure to 12 Kg/cm2
k.
Then the Starting Ejector air
valve will open & vacuum will start developing.
l.
Close the Vacuum breaker with
proper water sealing into it.
m.
Ensure HPBP Tank level
>95%.
n.
Ensure HPBP spray line After
& Before the manual valve in open condition.
o.
Ensure BFP pressure >90
kg/cm2.
p.
Ensure to select one of HPBP
oil pump.
q.
Release condition for SFG
Bypass is condenser vacuum<-700 g/cm2, FG condensate ON & HPBP station
NO trip.
r.
To Start SFG Bypass click
Button in TCC after opening the bypass manual drain valve.
s. The preselected HPBP oil pump
will start & if oil pressure <100 bar both pumps will start after
achieving the 180 bar pressure unselected pump will stop.
t.
HPBP pressure main valve open
& temperature controller ON.
u.
At Vacuum <-700g/cm2 open
the HPBP to 15% for taking the Running Ejector in service.
v.
Preselected Ejector steam
valve will open at the meantime Auxiliary steam CV to be increased to maintain
the Aux. Steam header pressure to 12 Kg/cm2.
w. The preselected Ejector air valve
will open.
x.
Starting the Ejector air valve
will close & then it's steam line motorized valve will close.
y.
Ensure SFG Drains is ON &
check all drains valves opened.
Turbine Rolling:
i.
Reset the 86G, 86U & 86T.
ii.
Ensure all alarms were reset.
iii. The generator is ready for
rolling.
iv.
All bearing Temperatures
& Vibration are normal.
v.
Lube oil Pressure>2.0
kg/cm2 & Temp<46 deg C.
vi.
Preselected COP is in Service
with control oil pressure > 120 kg/cm2 & stand by the pump is ready to start the solenoid of safety block is OFF.
vii.
Ensure MS-04 before &
after the drain was open.
viii.
Release for Turbo set ON is
turbine speed >4rpm, SFG sealing steam ON, SFG evacuation ON, Condensate
pump-1 or 2 ON.
ix.
When giving ON Command to FG Turbo set, SFG Live Steam & SFG Turbine gets ON.
x.
Ensure MS pressure>70
kg/cm2 & Temp>470 deg C.
xi.
Ensure all Drains turbine
drain 1 & 2, ESV Drains, CV drains & extraction drains are open.
xii.
Live steam Prewarming gets ON
(SLD).
xiii.
On prewarming MS-04 bypass, The valve will open.
xiv.
Check for Release in SFG
Turbine.
xv.
Ensure Live Steam pressure
before ESV is in between 8 to 12 kg/cm2.
xvi.
ESV will open after
prewarming finish.
xvii.
MS-04 main valve will open
slowly & TG Control valves will open, then barring gear disengaged & TG
RPM starts increasing. Observe the TG ramp up speed carefully.
xviii.
After MS-04 fully opened
MS-04 Bypass will get close.
xix.
JOP will Auto-stop at TG RPM
300.
xx.
All TG parameter to be
observed carefully during the TG RMP ramp up.
xxi.
According to SLD TG RPM will get
hold on 1470-1490rpm for 25 mins (1500 Sec) for Soaking and note the Inner
& Outer casing Temp. On SLD.
xxii.
After completing the first
Soaking time CV opening slightly increases to ramp up the TG RPM to next
Soaking point i.e 2880 RPM for 25 Min (1500 Sec) and note the Inner & Outer
casing Temp. On SLD.
xxiii.
At 2700 RPM (45 Hz) Gen.
Excitation Field Breaker gets close.
xxiv.
After completing the second
soaking time check for SLD release for Gen Synchronization.
Checks during running
2.
Check Lube oil system,
bearing metal temperature etc.
3.
Check control oil system,
control valves reference & feedback position.
5.
Check generator parameters
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