Flushing The Cylinder; Gas Solvent Changeover; Liquid Solvent Changeover And Flushing - Teledyne SyriXus 65x Installation And Operation Manual

SyriXus Series Pumps Installation and Operation Guide
Section 9 Pump Maintenance, Troubleshooting, and Servicing
9.12 Flushing the
Cylinder
9.12.1 Gas Solvent
Changeover
9.12.2 Liquid Solvent
Changeover and
Flushing
EAR99 Technology Subject to Restrictions Contained on the Cover Page
9-16
After cylinder/seal maintenance or during modifier (liquid solvent)
change, the pump cylinder should be flushed to remove possible
residue.
The way in which the cylinder is flushed will depend on your pumping
system and whether you are pumping a liquefied gas such as CO
(refer to Section 9.12.1 "Gas Solvent Changeover") or a liquid modifier
such as methanol (refer to Section 9.12.2 "Liquid Solvent Changeover
and Flushing").
When changing from one working fluid to another, ensure that
the two working fluids are not chemically reactive with each
other which could create a potentially hazardous situation.
This procedure is used when changing from one gaseous solvent to
another.
1. Close the valve on the fluid supply tank so that no solvent is sup-
plied to the system.
2. Turn the controller ON.
3. Run the pump until the cylinder is empty. It may be necessary to
turn OFF auto-refill (Section 3.4.3 "Refill") so that the pump
stops when the cylinder is empty. If there was any pressure in
the system, wait until all the pressure bleeds off.
4. Change the solvent tank.
5. Close the pump outlet valve.
6. Open the valve on the tank to repressurize the system.
7. Cycle the pump between REFILL and RUN a few times, opening
and closing the appropriate valves at the proper time to purge
any remaining gas from the pump. Use about 10 - 20 mL per
stroke to purge.
This procedure is typically used for modifier systems when changing
from one liquid solvent to another.
If high ionic strength aqueous reagent solutions are allowed to
remain in the pump, solid residues may be formed, which will
scratch the seals and the polished inner surface of the cylinder of
the pump. These scratches allow leakage, which compromises per-
formance.
WARNING
NOTE
2