Compressed Air

Question 1

Describe air compressors 01-04

05-06

07

Answer 1

Reciprocating air compressors, SCW cooled, broken

Rotary air compressors, SCW cooled, requires SCW booster pumps

Rotary air compressors, air cooled

Question 2

What is preferred air dryer 01 or 02, why?

Answer 2

01- uses electric heaters to regen the desiccant , 02 uses just air(heat of compression) so it wastes lots of air

Question 3

What in general is supplied by instrument air vs service air?

Answer 3

Instrument- plant valves and equipment

Service- grinders, pneumatic tools

Question 4

If 07 compressor is in “lead”, what is order of compressors loading?

In “normal”

05/06 in “dual”

Answer 4

Lead- 07(104#), 05/06(103#), 05/06(101#)

Normal- 05/06(103#), 05/06(101#), 07(99#)

Dual- 05 and 06(103#)

Question 5

What does Auto Start “enable” switch do?

What compressors does this apply to?

Answer 5

If compressor loses power and recovers, it will restart (if no trip conditions exist)

05 and 06

Question 6

Air dryer 01 and 02 regeneration schemes?

Answer 6

Timed

• 01 , swaps every 4 hours
• 02, swaps every 4 min

Dew point

• 01, swaps @ -30 deg
• 02, swaps @ -14 deg

Question 7

Flow path of air from PAC-05 to valves?

Answer 7

Aft cooler
Mois sep
Pre filt
Dryer
Receiver
Filter