5. With purge gas flowing from the inlet line, remove the protective caps
from the inlet and outlet valves on the purifier manifold and immediately
install the inlet supply gas line on the unit using a new gasket (supplied
with the purifier). Then, install the outlet of the unit to the process gas
delivery line leading to the equipment using a new gasket (supplied
with the purifier). Tighten the nuts until finger tight.
6. Gasket seating begins when there is sudden resistance to nut rotation.
Using an appropriate open-end wrench on the purifier and on the
connection nut (Ref. Table 3, last column), tighten per connection
make up instructions provided by the gasket seal supplier.
Note:
Gasket suppliers typically recommend that the connection nut
be rotated an additional 45 degrees (
⅛
turn) from the finger tight
position for nickel, silver-plated nickel, or stainless steel gaskets.
7. Open the isolation valve downstream of installation zone. Ensure the
gas flow path in the outlet gas line is open to vent or scrubber.
8. Open bypass valve and flow gas through bypass line.
9. Close bypass valve, wait for 2 seconds, and then open bypass valve
again. Repeat this procedure at least 10 times. These alternate
pressurization and venting cycles will reduce impurities (atmospheric
air and moisture) at the purifier inlet valve connection. This process
works best if there is a flow check valve downstream of the purifier.
10. Close downstream isolation valve, then close bypass valve.
11. Open the manifold inlet valve then slowly open the purifier inlet valve.
Allow purifier to come to equilibrium with upstream gas supply pressure
by introducing purge gas into the unit (Pall recommends setting the
purge gas supply pressure between 30 – 60 psig, 0.21 – 0.41 MPa).
Do not exceed pressure rating, MAWP, for purifier. Equilibration
process may take up to 10 minutes.
