Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual

Page: 71 / 196

Section 3: Tubing Connections
Revision – February 2005 Page 3 - 5
3.3 Vent Line
The vent line must be piped directly to an acceptable pollution abatement system
designed for the specific gas being vented. For systems equipped with the Auto
Purge feature, process gas will be introduced into the vent line during the "Pre-
Purge" purging cycle, when the process gas panel is being purged prior to process
gas cylinder removal. At this time, 50-60 LPM (106-127 CFH) of nitrogen is also
being sent into the line through the vacuum venturi loop. The purging sequences
run approximately 30-45 minutes.
Process gas can be introduced to the vent
system at any time in the event of certain
multiple component failures, therefore the vent
line and pollution abatement system should be
capable of handling a full process gas cylinder
release in the event of catastrophic failure.
When multiple gases are to be vented, ensure compatibility before plumbing vents
together. Contact your Air Products Representative for this information. A
nitrogen trickle purge is constantly bled into the vent line to maintain an inert
atmosphere when hazardous gases are being used. For this reason, the Venturi
Supply Valve (V7/MV7 or V13/MV13) is furnished with a trickle purge orifice.
The flow rate of this trickle purge is approximately 2-5 LPM (4-10 CFH). Figure
3.4 depicts a typical trickle purge assembly.
Figure 3.4: Typical Trickle Purge Assembly