12. Once equilibrated, open the purifier outlet valve, the manifold outlet
valve, and then the downstream isolation valve. This will initiate purge
gas flow through the unit. Ensure the gas flow path in the outlet gas
line is open to vent or scrubber.
13. If purge gas flow is not detected from the outlet end of the unit,
increase gas pressure or flow rate until gas is detected.
14. Continue the flow of inert gas for 5 – 10 minutes.
15. Unit is now ready for helium leak testing.
4. HELIUM LEAK TESTING
Shut off system isolation valve downstream of the purifier (part of the
process gas delivery line leading to the equipment), and then shut off
purge gas source (via upstream isolation valve).
Testing in-line purifiers (PG550 and PG2400):
1. Supply purified helium gas to the installation zone.
2. Open upstream isolation valve at purifier.
3. Pressurize purifier with helium up to maximum rated pressure (MAWP)
of unit.
4. Perform an outboard helium leak test on the purifier at the inlet and
outlet gasket seal connections using a sniffer probe.
5. Should leakage be detected, contact Pall Corporation SLS for technical
assistance. Do not attempt to repair purifier or valves in assembly.
6. Close upstream isolation valve at purifier.
Testing manifolded purifiers (PG550-MAN, PG2400-MAN, PG11000,
and PG11000-MAN):
1. Shut off upstream and downstream isolation valves on the purifier
manifold.
