Refrigeration 101

[Memo275]

Refrigeration System

1/Refrigeration system overview
*Propane Chiller: 57% Level
*LPG OH Condenser: 80% Level, LPG T°: -36°C
*Propane Economizer: 40% Level, PCV: 6 Bar, T° Gas: 9.5°C
*02Propane Compressor:
-PRO “A” -PRO”B”
.Capacity Control:
Set point (Bar) O.5 0.5
PID Out: 100% 100%
.High Stage Capacity Control:
Set point: 3.5 3.5 Bar
PID Out: 100% 100%
.Moy Amperes (Amp) 60.2 58.5
.Suction Pressure (Bar): 0.82 O.91
.Suction Temp (°C) : -41.3 -41.2
.Suction SH (°C): 5.0 3.3
.Intermediate Pressure (Bar): 4.0 4.4
.Intermediate Temp (°C) : 50.8 49.2
.Intermediate SH (°C): 55.5 51.6
.Discharge Pressure (BAR) : 13.5 13.8
.Discharge Temp (°C) : 74.0 72.1
.Discharge SH (°C) : 34.7 31.8
→Bypass Propane Condenser used in manual 0%
*Propane surge drum:
.Pressure: 14.5 Bar
.Level: 52%
*Gas Propane Exchanger:
.Propane T°: 34.75°C
.Gas T°: 29.25 °C
2/ Refrigeration Skid:
*Inlet Cold Separator: 26.4c°C
*Outlet Cold Separator: -28 °C
*Level Cold Separator: 40%
*Set point TCV: -45 °C (Bypass Cold Separator)
*Gas / Liquid Exchanger :
. Gas T°: 36.75 °C
.LPG T° : 8.85 °C
*Gas / Gas Cooler :
.Gas T° to sweet / sales gas Exchanger : 4 °c
.Gas T° to propane chiller: -16 °C
→*we can’t attend the cold Temperature -45°C
*Same times we have carryover of liquid on Propane Receiver
Please help me to identify the problem and correct them.