Page 205 - Compression Machinery for Oil and Gas

194 SECTION II Types of Equipment

150
Suction
Valve position (%) 50
Discharge
100

–50 0
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
Time (s)
0.08
Suction
Discharge
0.06
Mass flow (kg/s) 0.04

0.02
0
–0.02
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
Time (s)
FIG. 5.12 Valve position and mass flow vs. time. (Courtesy of SwRI.)

4
3.5
3
P/P s 2.5
2
1.5
1
0.5
0 45 90 135 180 225 270 315 360
Crank angle (degrees)
Mass flow: 4.47 e–03 kg/s, Power: 69.6 kW, PV Eff: 91.3%
4
3.5
3
P /P s 2.5
2
1.5
1
0.5
1 1.5 2 2.5 3 3.5 4 4.5 5
V / V 0
FIG. 5.13 Normalized pressure vs. crank angle and normalized volume. (Courtesy of SwRI.)