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Secondary > Service Air > Flashcards

Service Air Flashcards

1
Q

What kind of compressor is used in the service air system?

A

Rotary screw with intake silencer, intercooler, aftercooler and moisture separator

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2
Q

What pressure is maintained by the service air system?

A

115-125psig

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3
Q

What pressure will trip off the service air compressor?

A

135psig

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4
Q

What powers the Service air compressor motors?

A

NG

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5
Q

What powers the service air compressor space heaters?

A

NH

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6
Q

What is the limitation of using domestic water in place of turbine cooling water?

A

limited to 1 IA compressor and the 1 service compressor

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7
Q

What components of the service air system are cooled by TC?

A

Intercooler, aftercooler, lube oil cooler

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8
Q

What does the service air compressor do for condensate demineralizers?

A

air for resin fluffling during regen

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9
Q

What part does service air play in containment hydrogen purge (HP)?

A

Reduces hydrogen concentration and maintains the pressure in containment to provide motive force to hydrogen purge unit

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10
Q

What FP valves use service air?

A

pre-action valves

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11
Q

How is the service air compressor controlled?

A

by an on/off unloading system operated by an air pressure switch, which senses variations in the service air header

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12
Q

What is the purpose of the service air receivers?

A

Act as a pressure surge chamber

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13
Q

What is the purpose of the service air dryer?

What kind of dryer is it?

A

Removes moisture to dew point 35-45F at 125psig

Refrigeration type

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14
Q

What happens if the service air compressor runs unloaded for 20 mins?

A

It will auto stop

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15
Q

What is the evolution with the greatest high rate usage of service air?

A

Fluffing the resin beds

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16
Q

What actions are to be taken in the event I lose service air?

A

Use of service air is to be minimized.

If available a backup maybe used.

Secondary (26 decks)

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