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NOWPAK LINER-BASED CANISTER SYSTEM
User Manual | Entegris, Inc.
Tools Required (see Required Tools on page 28):
O-ring removal tool part number NA-27.
Items Needed: O-rings and compression ring for the
closure being serviced. See closure component table,
page 23, for ordering information.
1. Remove the cap from the closure base.
2. Unless the cap has been exposed to chemical, there
is no need for additional cleaning or O-ring removal.
Inspect the cap O-ring and replace if necessary.
a. Slide the worn O-ring from the cap using an
O-ring pick or similar tool.
b. Install the replacement O-ring. Ensure that it is
seated uniformly in the O-ring groove.
3. Remove the compression ring and O-ring from the
bottom of the closure base, using an O-ring removal
tool. The compression ring and FEP-encapsulated
silicone O-ring can be cleaned and reused several
times. The EPDM (or EPDM with PTFE coating)
O-ring must be replaced with each closure use.
4. Clean the closure base, compression ring, and
FEP-encapsulated silicone O-ring by using an
appropriate solvent for the application.
5. Install closure seal O-ring and compression ring.
Place the O-ring carefully in the O-ring gland,
taking care to avoid twisting.
6. Install the compression ring by pressing it firmly into
the closure base.
7. Blow off the closure assembly using filtered
nitrogen to remove any surface contamination.
4- to 40-liter closures
Closure cap O-ring
Compression ring
Closure seal O-ring
200-liter closures
Closure cap O-ring
Compression ring
Closure seal O-ring
Figure 40. Two-piece closure components.
NOTE: Installing the O-ring first assists in the installation of
the compression ring.
IMPORTANT: The closure seal O-ring provides a critical seal
that enables the pressure dispense function of the dispense
connector. EDPM material begins to deteriorate after its
initial use. Therefore, to ensure seal performance during
pressure dispense application, this O-ring must be replaced
with each use of the closure.
DISPENSE CONNECTOR MAINTENANCE
Dispense connector maintenance includes cleaning
and O-ring replacement. O-ring replacement is the
major maintenance activity, Figure 41. On some
dispense connectors the user may also replace the
probe, liquid dispense fitting, and the gas inlet fitting.
Figure 41. Removing dispense connector O-rings (ND-CD shown).
NOTE: For maintenance procedures to be performed on
the dispense connector, including O-ring replacement,
refer to the Entegris user guide for the type of dispense
connector being used (ND-CD, ND-LD, or MaxMT).
