
Pre-Installation Guidelines & Checklist
8
Liquid CO2Supply System
Cold Jet recommends the supply line for the liquid CO2from the storage tank to the pelletizer
to be direct (with limited bends) and well insulated. This will help prevent the formation of
gas and maintain the temperature of the liquid CO2thus improving the performance of the
pelletizer.
It is the responsibility of the installer of the liquid CO2 supply system to determine the best
supply line route and the insulation needed. Use the data guidelines below to design and
install the liquid CO2supply system:
Liquid CO2Supply System PR120H PR350H PR750H
Supply Pressure (Min-Max) 16-22 bar (232-319 psi) - Optimum performance range 16-17 bar (230-250 psi)
Supply Pressure Range +/- 1.0 bar (14.5 psi)
Supply Pressure (Recommended PBU Setting) 16.5 bar (240 psi)
Flow Rate - Minimum 900 kg/hr (1984 lb/hr) 2200 kg/hr (4850 lb/hr) 2200 kg/hr (4850 lb/hr)
Max volume withdrawal (PBU-Dimensioning) 264 kg/hr (582 lb/hr) 770 kg/hr (1698 lb/hr) 1650 kg/hr (3638 lb/hr)
Pelletizer Design Pressure / PRV setting 27.6 bar (400 psi)
Liquid CO2Line Size Recommended ID 20 mm (0.75 in) 25 mm (1.0 in) 25 mm (1.0 in)
Liquid CO2Connection at Pelletizer EU: 3/4-inch BSP / US: 3/4-inch NPT
Liquid CO2Line Insulation Min. 75mm (3.0 in) Industrial Insulation - (Urethane Foam - PVC/Alu jacket)
NOTE: If the liquid CO2supply line is serving more than one pelletizer, other CO2consuming
machinery, or is longer than 30 m (100 ft) the owner should consult with the CO2piping
contractor for an optimal design for a stable and gas-free liquid CO2supply to the pelletizer.
NOTE: For CO2tank installation and the liquid CO2 supplier the recommended supply pressure
settings are 16-17 bar (230-250 psi) for optimized output performance and quality. The liquid
CO2 quality in use must meet general purity requirement of commercial industrial/food grade
specications and must be free of oil and have a purity of minimum 99.9%. For optimum
performance and high density pellets quality the water (H2O) content should not exceed 35
ppmv and not be less than 5 ppmv - or equivalent to a dew point temperature of -66°C to
-51°C (-86.8°F to -59.8°F). If only very dry CO2is present please contact Cold Jet for optimal
special extrusion process design and settings.
Liquid CO2Degasser System
In order to achieve a consistent, high-quality supply of liquid CO2to the pelletizer (especially
the low-capacity pelletizer PR120H), Cold Jet recommends the installation of an automatic
gas venting system, such as the Armstrong Kit (refer to "Figure 3: Degasser (Armstrong) Kit.
Installing an automatic gas venting system will improve the performance of the pelletizer and
increase dry ice production.
The installation of the Armstrong Kit, or similar system, is optional and is the responsibility of
the installer of the liquid CO2 supply system and piping up to the pelletizer connection.