CHART Orca MicroBulk CO2 Series, Product Manual

13

Operations

Product Manual - Orca

™

 CO

2

 Series MicroBulk Delivery System

    vapor balance and Orca CO

2

 Vapor Balance  

    (V-44) valves 

— If Orca CO

2

 is higher pressure than supply tank:

a  Open supply tank vapor balance and Orca CO

2

    Vapor Balance (V-44) valves 

b  Open Bottom Fill (V-17) valve  

c  Start pump with Switch (SW-1) 

9   Monitor for pump to catch prime 

a  Pump discharge pressure should be 70 psig higher  

    than tank pressure (bypass valve factory setting) 

b  In recirculation mode, if pump discharge pressure  

    is less than 50 psig higher than Orca CO

2

 tank, pump  

    did not catch prime; stop pump and restart or open the  

    Pressure Dispense (V-4) valve to help catch prime 

10   Open Pressure Dispense (V-4) valve and throttle to 

maintain pump discharge minimum 25 psig higher than 

Orca CO

2

 tank pressure 

a  This keeps the pump on the pump curve, maintaining  

    prime 

b. Too little pressure differential can cause pump   

    cavitation 

c. Too much pressure differential creates a low flow rate.

11   Monitor liquid level and pump pressure 

12   When liquid level is getting close to full (3/4 of net 

capacity), open Vapor Balance Line Drain (V-45) valve 

a  The vapor balance line serves as the 95% full trycock 

Note:  Do not pressure build with Orca CO

2 

after filling has started. If the PB coil 

is overrun, liquid will enter the vapor 

balance/full trycock line, giving a false 

indication that Orca CO

2

 is full. 

13   When liquid exits the Vapor Balance Line Drain (V-45) 

valve stop the pump (SW-1) and close the Bottom Fill 

(V-17) valve 

14   Close the Pressure Dispense (V-4) valve 

15   Close the Vapor Balance Line Drain (V-45), Vapor 

Balance (V-44), supply tank dispense & vapor balance 

valves 

16   Open the Fill Line Drain (V-9) and Vapor Balance Line 

Drain (V-45) valves to drain and release all pressure  

Close Fill Line Drain (V-9) and Vapor Balance Line 

Drain (V-45) valves  

Warning!  Fast depressurization of liquid 

CO

2

 can cause dry ice to form, 

holding in pressure that is 

quickly released when dry ice 

melts. Follow proper safety 

procedures for draining and 

venting liquid CO

2

 from hoses. 

17   Disconnect hoses from Vapor Balance (DC-5) and Line 

(DC-1) connections 

18   Close cabinet doors and stow hoses  Replace all dust 

caps   

19   Disengage engine speed control and disengage PTO 

Filling Levels - MC-338

The DOT regulations limit the fill levels based on the 

tank’s pressure control valve settings  This volume assures 

that when the pressure control valve discharges the tank is 

not liquid full. This fill volume varies with the saturation 

pressure of the liquid. DOT fill levels are based on the 

weight of the liquid. Differential pressure liquid level gauges 

are an approximation of the pounds of liquid in the vessel  

The true full liquid level should be determined by the full 

trycock  Both are dependent on the vessel being level  

Current Saturation of Liquid

Upon arriving at a delivery site, the Orca tank pressure 

indicator (PI-1) will reflect the current saturation pressure. 

During travel the liquid splashes condensing the warmer 

vapor  This is referred to as “splash down ” During pressure 

building operations the tank pressure will rise  This is not 

an increase in the saturation pressure but an increase in the 

subcool  During normal deliveries the saturation pressure 

will remain the same as at arrival 

IV. Pressure Build: Heater

Note:  Instructions are specific to the standard 

heater and programmable controller. 

Other heaters and controllers may be 

used, refer to their respective manuals. 

1   Review heater and heater controller manuals for 

additional operational information