Page 464 - Compression Machinery for Oil and Gas

444 SECTION III Applications

Steady state pipeline Characteristic 85% 82% 78% 74% 100% Load 60% Load Inlet volume flow 100% Load 60% Load

5%
87% Steady state pipeline Characteristic 78% 74% Flow control
82% 85% 82% Inlet volume flow

5%
87%
Surge limit
82%
Isentropic head
Flow control Surge limit

Isentropic head
Steady state pipeline Characteristic 85% 82% 78% 74% 100% Load 60% Load control. Steady state pipeline Characteristic 74% 100% Load Pressure control 60% Load control.

5%
87% Inlet volume flow flow (right) 85% 82% 78% Inlet volume flow flow
82% 5% (right)
control 82% 87% control

pressure pressure
Surge limit

Isentropic head (left) Surge limit (left)

Recycle valve partially open control Pressure control reduction Load Isentropic head Increase Load

11.10 11.11

FIG. FIG.