Chapter - 3
MNL000442.doc
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09/19/2016
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
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3.4
Venturi Line
Versum Materials, Inc. strongly recommends separate venturi supply source
rather than a houseline source.
Most process cylinder pressures are significantly higher than houseline operating
pressures. In the event of multiple failures of certain process panel components,
there is a remote possibility of back contamination of the houseline source
connected to the vacuum venturi.
Contact your Versum Materials, Inc. representative for design details.
The venturi line requires 75-95 psig (5.2-6.6 barg) of nitrogen to adequately
produce the vacuum needed during purge cycles. The supply is usually taken from
a bulk liquid source, but it can also originate from a cylinder manifold system. The
vacuum generator will demand a flow of 50-60 LPM (106-127 CFH) of nitrogen
during purge cycles.
3.5
Purge Line
A purge line may be provided when the nitrogen purge cylinder is not included in
the source system. This purge line must be connected to a designated purge source
for the source system. The pressure required during cylinder purging is 80-90 psig
(5.5-6.2 barg). If an external purge source is used, sufficient over pressure