Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 41 of 105
VI. System Operational Description and Component Review (continued)
E. Nitrogen Separation Component Review
The separation components will remove nitrogen in solution from the recovered AGENT
as well as control the overall operation of the equipment in terms of recovery and pump
out modes. AGENT from the filtration components will flow past a maintenance access
valve AV-1 and into a plate heat exchanger for pre-cooling. The pre-cooled AGENT will
pass through the process tank inlet solenoid valve SV-1A through the process tank
manual maintenance ball valve MV-5 through the process tank inlet check valve CV-4 and
then enter the process tank. The AGENT will now be held in the process tank for final
cooling and nitrogen separation. The nitrogen will come out of solution as the liquid in the
process tank cools to lower temperature ranges. Cooling in the process tank is
accomplished by an internal coil connected to the cascading refrigeration system.
NOTE: The coolant for the plate heat exchanger and the process tank coil is provided
by the cascading refrigeration section. Details of the cascading system are provided by
the PP Series Temperature Chamber Operation, and Maintenance Manual attached
following this document.
The conditions in the process tank are monitored by the three position liquid level switch
L2, the temperature probe T1 that is connected to the front panel process temperature
controller, pressure switch P3 and pressure transducer P4 that is connected to the front
panel pressure controller. All of these sensors will communicate with the system PLC to
accomplish final nitrogen separation refer to section VI.B: The Nitrogen Vent Cycle, for a
complete description of the separation process.
When conditions are correct the machine will begin a nitrogen venting process. This will
allow nitrogen gas to be released from the process tank reducing the pressure and
solubility of the nitrogen in the AGENT.
The sequence will begin with the opening of the nitrogen vent solenoid valve SV-3 (PLC
output #A4 Activates). The nitrogen will travel past the emergency pressure relief valve
PV-1 (provides process tank over pressure protection at 300 psi) the pressure switch P3,
the pressure transducer P4, through the solenoid valve SV-3, through the nitrogen vent
check valve CV-5, and out of the nitrogen vent port. The nitrogen will continue to flow until
the venting sequence is complete or changes in conditions occur to those not suitable for
venting.
The AGENT remaining in the process tank has now been cleansed of moisture, acids,
particulates, oils and nitrogen and is ready for pump out.
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