module 7 - bleed air system.pdf
TRANSCRIPT
-
Barinas Power Plant
Bleed Air System
-
2
El Furrial Power PlantBarinas Power Plant
Learning ObjectivesUpon completion of this training, participants will beable to: Describe the purpose and location of the bleed valves.
Describe basic valve operation.
-
3
El Furrial Power PlantBarinas Power Plant
Bleed Air SystemPURPOSEPrevents compressor surge and/or stalls duringacceleration and deceleration.
DESCRIPTION One bleed valve and actuator assembly mounted
around the Compressor Rear Case (IntermediateSection).
Located at three oclock on intermediate case. Each assembly consists of a separate actuator and
valve. The two are coupled by a splined shaftarrangement.
-
4
El Furrial Power PlantBarinas Power Plant
Bleed Air System
-
5
El Furrial Power PlantBarinas Power Plant
Bleed Air SystemOPERATION
The valve operates on a pressure differentialestablished by the springs acting on the servo controlvalve and the piston.
During start up, PS4 is low and the spring pressurecloses the valve.
As the compressor rpm increases, PS4 pressure risesand acts on the piston, causing it to open the actuatingvalve.
-
6
El Furrial Power PlantBarinas Power Plant
Bleed Air System Air in the opposing chamber of the piston vents
through the fitting on the end of bleed valve actuator. When PS4 gets high enough, the servo moves and
ports PS4 to the opposing chamber, causing the valveto close.
An internal lever is moved by the piston to convertlinear motion to rotational force to open and close thevalve.
The pressure differential established by the springswill cause the valve to open and close with PS4 dropsthat occur during deceleration.
-
7
El Furrial Power PlantBarinas Power Plant
Bleed Air System
-
8
El Furrial Power PlantBarinas Power Plant
Bleed Air System
-
9
El Furrial Power PlantBarinas Power Plant
Are there any questions?
Review the sections learning objectives.
Bleed Air SystemLearning ObjectivesBleed Air SystemBleed Air SystemBleed Air SystemBleed Air SystemBleed Air SystemBleed Air SystemSlide Number 9