Prestart checks and starting of lube oil system:
1 Check the lube tank level is normal (>50% in upper gauge glass, Two gauge glasses are
provided).
2 Check the lub oil system is properly lined up (one cooler & one filter).
3 Check all the instruments are fixed and the root valves are open.
4 Check the lub oil coolers are charged from SGECW side.
5 EPB’s of LOP are released.
6 Check recirculation valve is crack open.
7 Give clearance to UCB to start one lub oil pump.
8 After the LOP is started from UCB, feel the oil flow in recirculation line and close recirculation
valve after two minutes of pump starting.
9 Check the return oil flow from bearings and check the oil pressures. The Normal control oil
pressure after the cooler & filter is > 10.00 Ksc & Lub Oil pressure is 2ksc.
10 Check for any oil leakage from inside the fan casing.
11 If control oil pressure is < 9.5 ksc, BMD to be informed to adjust relief valve setting.
12 Check for any abnormal sound from the pump.
Prestart checks and starting of PA fan1 Ensure that there is no pending PTW against the fan / lube oil system, ducting, dampers and
motor.
2 Check and release EPB at local.
3 Ensure that there is no reverse rotation of the fan.
4 Ensure that the lube oil system is in service.
5 Check air path is available. At least one PAPH is ON and air path of the APH available (APH air
I/L & O/L dampers are open), for second PA fan both PAPH must be on.
6 Check that the SCAPH inlet / outlet damper are open bypass damper is closed incase of cold
start up and SCAPH line isolated and bypass damper are open in case of hot start up.
7 Remote / local selector switch of blade pitch mounted on the actuator is selected in remote and
the blade pitch is in minimum position.
8 Check that the outlet (discharge) damper is in closed position and in remote.
9 Check the PA fan discharge duct drain valve is in closed position .After shut down with air preheater water washing this duct drain should be opened first to check any water accumulation inside fan casing, before taking PA fan into service.
10 Locally check all manholes are closed at 0 mtr.
11 Keep cold air gate damper of at least two mills open so that minimum air flow is assured.
12 Check the fan bearing oil temperatures and oil flow through the bearing outlet lines.
13 Check all permissive satisfied in the start permissive window.14 Start the fan with blade pitch minimum position and ensure opening of discharge damper fully.
Then gradually increase the blade pitch position to load the fan.
15 Check for any abnormal sound, vibration of fan / motor.
16 Check for any oil / air leakage.
STARING OF SECOND PA FAN:
1 Both PAPH must be ON and its inlet and outlet damper open.
2 At least three mills be in service.
3 Put blade pitch of 1st PA fan in CAS and PA header pr. In auto with set point 850 mmwcl – 900
mmwcl.4 Start 2nd PA fan and put blade pitch of 2nd PA fan a command of 10-15% as the discharge
damper starts opening and close feed back disappears.
1 Check the lube tank level is normal (>50% in upper gauge glass, Two gauge glasses are
provided).
2 Check the lub oil system is properly lined up (one cooler & one filter).
3 Check all the instruments are fixed and the root valves are open.
4 Check the lub oil coolers are charged from SGECW side.
5 EPB’s of LOP are released.
6 Check recirculation valve is crack open.
7 Give clearance to UCB to start one lub oil pump.
8 After the LOP is started from UCB, feel the oil flow in recirculation line and close recirculation
valve after two minutes of pump starting.
9 Check the return oil flow from bearings and check the oil pressures. The Normal control oil
pressure after the cooler & filter is > 10.00 Ksc & Lub Oil pressure is 2ksc.
10 Check for any oil leakage from inside the fan casing.
11 If control oil pressure is < 9.5 ksc, BMD to be informed to adjust relief valve setting.
12 Check for any abnormal sound from the pump.
Prestart checks and starting of PA fan1 Ensure that there is no pending PTW against the fan / lube oil system, ducting, dampers and
motor.
2 Check and release EPB at local.
3 Ensure that there is no reverse rotation of the fan.
4 Ensure that the lube oil system is in service.
5 Check air path is available. At least one PAPH is ON and air path of the APH available (APH air
I/L & O/L dampers are open), for second PA fan both PAPH must be on.
6 Check that the SCAPH inlet / outlet damper are open bypass damper is closed incase of cold
start up and SCAPH line isolated and bypass damper are open in case of hot start up.
7 Remote / local selector switch of blade pitch mounted on the actuator is selected in remote and
the blade pitch is in minimum position.
8 Check that the outlet (discharge) damper is in closed position and in remote.
9 Check the PA fan discharge duct drain valve is in closed position .After shut down with air preheater water washing this duct drain should be opened first to check any water accumulation inside fan casing, before taking PA fan into service.
10 Locally check all manholes are closed at 0 mtr.
11 Keep cold air gate damper of at least two mills open so that minimum air flow is assured.
12 Check the fan bearing oil temperatures and oil flow through the bearing outlet lines.
13 Check all permissive satisfied in the start permissive window.14 Start the fan with blade pitch minimum position and ensure opening of discharge damper fully.
Then gradually increase the blade pitch position to load the fan.
15 Check for any abnormal sound, vibration of fan / motor.
16 Check for any oil / air leakage.
STARING OF SECOND PA FAN:
1 Both PAPH must be ON and its inlet and outlet damper open.
2 At least three mills be in service.
3 Put blade pitch of 1st PA fan in CAS and PA header pr. In auto with set point 850 mmwcl – 900
mmwcl.4 Start 2nd PA fan and put blade pitch of 2nd PA fan a command of 10-15% as the discharge
damper starts opening and close feed back disappears.
Plz share working of Blade pitch servo driven by control oil.How it works & adjusted by BMD team. Ur blog is really useful..Keep doing it
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