CHART Orca MicroBulk CO2 Series - Operations - Pressure and Delivery; Pressure Build and Delivery Methods

13
OperationsProduct 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 dierential can cause pump
cavitation.
c. Too much pressure dierential creates a low ow 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lling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 ll 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 ll volume varies with the saturation
pressure of the liquid. DOT ll levels are based on the
weight of the liquid. Dierential 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 reect 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specic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.