Fig. 15 —500P EEV Operation Driver
Initial EEV opening
Is Pe 14.5psi?
Keep the EEV
open for five minutes
NO
YES
Pump down order
NO
EEV Superheated
degree control
EEV open to 200P
for 3min
7~12K: EEV open to 350P,
15~30K: EEV open to 300P,
36~54K: EEV open to 250P.
Is DSH 27F?
YES
NO
NO
Is Pe 44psi?
YES
Is Startup time
30min
?
Pe 17psi,
or Tdsh 45,
or Pc 464psi
Is Pe 22psi?
YES
NO
EEV Superheated
degree control until initial
EEV opening three minutes
YES
EEV -16P until close
YES
NO
YES
NO
EEV open to 200P for one
minute, if Pe 14.5psi, the
next time EEV opening
+80P until 480P