Term
Turb Aux
Describe turbine steam seal system. |
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Definition
-Above 50% leak off from HP turbine seals and steam admission valves provides pressure at 4 psig.
-Less than 50% 4 psig maintained by regulator at 4 psig (off bypass line).
-Less than 150psig bypass valve used.
-Exhauster maintains 10"Hg.
-Exhauster condenser cooled by feedwater from cond pump. |
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Term
Turb Aux
Describe the power supplies for the exhaust blowers. |
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Definition
-11 from MCC-131.
-12 from MCC-121. |
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Term
Turb Aux
Describe the power supply to the Aux oil pump. |
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Definition
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Term
Turb Aux
Describe the power supply to DC emergency bearing oil pump. |
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Definition
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Term
Turb Aux
Describe the power supply to the turning gear oil pump. |
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Definition
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Term
Turb Aux
Describe the lift pumps. |
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Definition
-6 pumps supply oil at 500# to bearings 3-8 to lift shaft.
-Auto start at 5psig supply pressure.
-Manually secure at >900rpm (oil wedge created).
-Low pressure alarm at 440psig. |
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Term
Turb Aux
Describe normal lube oil temps. |
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Definition
-Normally 110-112F.
-On turning gear 80-90F.
-Rise across bearings should not exceed 50F. |
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Term
Turb Aux
Describe cooling to lube oil cooler. |
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Definition
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Term
Turb Aux
Describe the Aux oil pump. |
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Definition
-Primarily used during startup and shutdown.
-Supplies oil at 180psig.
-Will auto start if pressure drops below 201#. |
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Term
Turb Aux
Describe the main shaft oil pump. |
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Definition
-Driven by turbine by helix gears.
-Operates sufficiently at 1600rpm. |
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Term
Turb Aux
Describe the booster oil pump. |
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Definition
-Oil driven pump.
-Supplies NPSH to main shaft oil pump.
-Operates at >1600 turbine rpm. |
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Term
Turb Aux
Describe the turning gear oil pump. |
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Definition
| -Auto starts when mail oil pressure drops below 136psig. |
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Term
Turb Aux
Describe the emergency bearing oil pump. |
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Definition
| Auto starts when header pressure falls to 21psig. |
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Term
Turb Aux
Describe the turning gear. |
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Definition
-Once engaged can only be disengaged by driving turbine with steam.
-Motor must be moving to engage for meshing. |
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Term
Turb Aux
Describe when the turning gear motor starts. |
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Definition
-Oil bressure to bearings is > than 15psi.
-Turbine speed is less than .6rpm.
-Main transfer output breakers 8N7 and 8N8 are open.
-Turning gear is not already engaged.
-Turning gear handswitch in AUTO. |
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Term
Turb Aux
Describe when the turning gear will auto engage. |
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Definition
-Turbine speed is less than .6rpm.
-All 3 ligt pump motors are running.
-Turning gear motor is running. |
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