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4.2
Piping installation Schematic
4.3
Piping Schematic Component Index
1.
Sample Isolation Valve - This is a recommended item as it allows access to the sample
system without interrupting the main process line.
2.
Sample Tube – This should be stainless steel for dry air or gas applications but copper
or carbon steel can be used where wetter gases are to be measured. If any section of the
sample tube must be flexible then PTFE should be used. In most cases, 3mm OD
(1/8”) is sufficient as it provides good system response time with minimum flow. 6mm
OD (1/4”) tube can be used where pressure drops across the 3mm tube are too high
1
2
3
4
5
6
7
8
Main
Process
Line
Notes
a.
The sample point should be on the upper surface of the horizontal pipe, or from a
vertical section of pipe, wherever possible.
b.
The sample tube should run upwards from the sample point. If this is not possible,
then an inspection port or drain tap should be installed at the lowest point in the
sample system.
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