Air Products GASGUARD TE10, Инструкция по установке, эксплуатации и обслуживанию, Страница: 122 / 196

GASGUARD
®
TE10 Distribution System Manual
Air Products and Chemicals, Inc. 7 - 14
This option starts the Line purge sequence for the selected Branch. This operation
is used to reduce the amount of hazardous process gas in the Line to safe levels
prior to maintenance or other activities.
The purge sequence tests for adequate purge pressure and vacuum, then initiates a
series of purge cycles of the Line process piping to reduce process gas
concentration to safe levels.
The number of purge cycles depends on the type of process gas. Minimum values
are built into the sequence. Cycles may be increased (See System Configuration in
Section 8.8 of this manual), but not reduced below the minimum.
Flow Purge (Optional Process Line Purge)
This purge sequence consists of flowing purge gas continuously through the Line
and downstream process line. The gas is vented through a vent valve at the tool or
through the tool itself. This purge process is used to reduce the concentration of
hazardous gas to safe levels to allow maintenance to be performed on the process
line.
The customer must establish a purge time to reach a safe level that is based on the
flow rate, line length and type of gas. The vented gas should be monitored for
residual hazardous gas concentration before maintenance is performed.
Line purging can also be performed using Manual Mode.
Rough Line Evacuation (Optional Process Line Purge)
This option starts a purge and evacuation sequence for both the selected Branch
and the process line to the tool isolation valves. The purpose of this sequence is to
remove the major portion of the hazardous process gas from the Distribution
System Branch and downstream process line through the vent system of the
Distribution System. It does not reduce the concentration of hazardous gas to safe
levels for maintenance activities.