Two Typical Applications A-1
September 2007
Blanketing Gases in
Hydrocarbon Liquid
Storage Tanks
The XMO2 transmitter and its associated sample system is often used
to measure the concentration of oxygen (O
2
) in the nitrogen (N
2
) or
carbon dioxide (CO
2
) gases used to blanket hydrocarbon liquids
during storage.
The Problem Air can leak into the vapor space above hydrocarbon liquids stored in
tanks or process vessels, forming a potentially explosive gas mixture.
To solve this problem, inert gases such as N
2
or CO
2
are often used to
purge the vapor space above the stored liquid and dispel any O
2
that
may have leaked into that space. In such a system, one must
constantly monitor the level of O
2
in the vapor space to make sure
that an explosive gas mixture does not form.
Equipment Used A typical instrumentation package for this application includes an
XMO2 transmitter configured for a range of 0-21% O
2
in N
2
or CO
2
and operating conditions of ambient temperature and atmospheric
pressure. The XMO2 is mounted in a sample system similar to the
one shown in Figure A-1 below (dwg. #731-559).
Figure A-1: Blanketing Gas Sample System
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