ID FD PA Logic System

April 19, 2023 PMI Revision 00 1

ID/FD FAN LOGIC SYSTEM


P&I OF BOILER AUXILLARIES A. FD FAN START PERMISSIVES

• Blade pitch position minimum.

• Discharge damper fully closed.

• Lube oil pressure adequate.

• Control oil pressure adequate.

• Oil tank level normal.

• Bearing temperature not high.

• One ID Fan running AND other FD fan not running.

OR Both ID Fan running


TRIPS

• Fan bearing temperature very high

• Post purge furnace pressure very high/ very low

• Outlet damper fail to open in set time (3 min)

• No ID fan running or one ID fan and one FD fan

already in service.


PA FAN START PERMISSIVES

• Blade pitch minimum• Lube oil pressure adequate• Control oil pressure adequate• Bearing temp. not high• Discharge damper closed. • Lube oil tank level adequate • No MFT & Cold air damper closed• At least one FD fan is running and • PAPH A/B in service & respective air inlet/ outlet

dampers are open


TRIPS

• Fan bearing temperature very high.

• Trip from FSSS (MFT).

• Discharge damper fails to open.


ID FAN START PERMISSIVES

• Hyd. coupling Scoop position minimum.

• Inlet guide vane position minimum.

• Bearing temperature not high.

• Oil temp. and oil level in Hyd. coupling OK.

• Lube oil pressure adequate.

• Both inlet and outlet dampers closed.

• Other ID fan not running or Any FD fan running.


TRIP CONDITION

• Fan/Motor bearing temperature very high.

• Lube oil pressure very low.

• Post purge furnace pressure Hi/Low from FSSS.

• Discharge dampers/ suction damper fail to open

within specified time (3 min.)

• Hydraulic coupling bearing temp. very high

• Hydraulic coupling oil temp. very high.


SGWC PUMPS: (CC Pumps)

PERMISSIVES

• Discharge valve 1 open.

• Discharge valve 2 open.

• Motor cavity temp. not high.

• Pump cavity – suction manifold differential

temp. not high.

• Motor cooling water flow adequate.


TRIPS

• Any of the discharge valves not fully open.

• Motor cavity temp. high (60 deg. C) for more

than 5 Sec.

• Electrical protection trip/ EPB pressed.


Run back operation• Tripping of PA Fan or FD Fan• PA header pressure low/very low• Sequential tripping of Mills/Feeders

ID FD PA Logic System

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