CHART Orca MicroBulk CO2 Series, Product Manual

15

Operations

Product Manual - Orca

™

 CO

2

 Series MicroBulk Delivery System

ii  The lower the liquid level, the lower the rate of  

    pressure build 

iii  At low liquid levels (less than 1/4 full), the  

     pressure build rate will be diminished and stop  

     at some point, depending on truck pitch  Items to  

     assist include:

1  Park with the truck front high   

2  Dump the truck air bags 

3  Use Pump Force Feed (V-16), item ‘b’  

    below 

b  Open the Pressure Build Force Feed (V-16) valve to  

    build pressure while the Pump (P-1) is running 

i  This is needed when the liquid level in Orca CO

2

   drops below 1/4 full during a pump delivery 

ii  This can be opened before starting the Pump (P-1);  

    it will also assist in catching prime 

4   Pressure building is dependent on many factors: liquid 

level, vessel pressure, liquid temperature, truck angle, 

etc  This system was designed to pressure build via 

gravity flow (PB Liquid (V-28) valve) at low-liquid 

levels  The standard heater was selected for many 

factors and will perform well in most situations  Since 

the Pressure Build Coil (PBC-1) is sized larger than the 

heater can output, the pressure build rate will diminish 

from when either of the pressure build valves (V-28 

or V-16) are open and eventually overrun in these two 

conditions:

a  High liquid level with the PB Liquid (V-28) valve  

    fully open 

i  Small deliveries through the hose reel are not an  

   issue and will not be noticed 

ii  Large-pressure transfers through bulk hose will  

    eventually cause loss of subcool  If subcool drops  

    under 5 psig meter accuracy will be compromised   

    It is recommended that large bulk transfers utilize  

    pump delivery and vapor balance 

iii  The Pressure Build Coil (PBC-1) will continue  

     to build pressure even when over-run 

iv  Throttling the PB Liquid (V-28) valve at high  

     liquid levels will delay the time the coil takes to  

     over-run. Throttling may have effects on PB rate  

     and should be analyzed in each delivery scenario  

     where needed 

b  Pump (P-1) delivery situations with the PB Force  

    Feed (V-16) valve fully open 

i  Use the PB Force Feed (V-16) valve with low  

   liquid levels when the PB Liquid (V-28) valve  

   cannot build pressure and throttle as necessary 

ii  Pump recirculation through the Bypass (V-7)  

    valve reduces tank pressure  Start delivery as  

    soon as the pump catches prime to minimize this 

iii  High pump delivery rates will reduce the   

     pressure in the Orca CO

2

. This will not affect  

     metering due to subcool added by the pump 

c  These situations are normal operation 

5   Close the Pressure Build Liquid (V-28) and/or the 

Pressure Build Force Feed (V-16) valve to stop pressure 

building 

VI. Pressure Delivery: Hose Reel

1   Start Pressure Build Heater with adequate time before 

delivery 

a  See 

“IV . and V . Pressure Build” 

instructions 

2   Turn truck key to ACC position  Flowcom has no power 

in key OFF position 

3   Open cabinet doors 

4   Note the Orca CO

2

 vessel starting pressure  Open 

Pressure Build Liquid (V-28) valve. Build sufficient 

pressure for delivery 

a  Minimum 5 psi subcool needed for meter accuracy  

    when pressure dispensing  

b  Higher pressure = faster delivery, but more heat input  

    into the vessel 

c  Cycle PB Liquid (V-28) valve as needed to not exceed  

    the tank MAWP  Exceeding the tank 350 psig MAWP  

    will cause the main reliefs to vent 

5   Power on Flowcom and select DELIVERY mode  This 

also powers on the printer 

6   Two methods to pressure dispense through hose reel 

— Purge Needed

: Hose Reel Delivery Flex Hose (DC-

3) is not connected to Dispense (DC-2) connection from 

previous delivery and delivery flex hose purge is needed. 

a  Connect Hose Reel Delivery Flex Hose (DC-3) to  

    Dispense (DC-2) 

b  Open Pressure Dispense (V-4) and Delivery Flex  

    Hose (V-47) valves