CHART Orca MicroBulk CO2 Series - Pressure Delivery: Hose Reel

15
OperationsProduct 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 ow (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 eects 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 aect
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 sucient
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 ex 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.