Approved Gas Types; Suitability And Safety For Natural Gas Containing H2 - RMG USM GT400 Operating Manual

13 Technical specifications

13.2 Approved gas types

The device must only be operated with the following gas types.
Safe operation is only guaranteed with the gas types specified:
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• gases of class 1
• gases of class 2
• gases of class 3
The components of the gases must be within the concentration limits for test
gases according to EN 437:2009 or similar national standards.
The national standards of other countries demand similar gas type specifications.
Notice
In general, the gas to be measured must not build any condensates in the
operating range of the USM (flow, pressure and temperature range) and
must be free of corrosive and aggressive components, liquids and solids.
In case of deviating conditions a suitable operation has to be agreed with
the RMG service.
13.2.1

Suitability and safety for natural gas containing H2

The USM GT400 can be used in hydrogen-containing natural gas. There are no
safety-related concerns for this use.
Notice
In accordance with the German TR-G19 – the USM GT400 is suitable and
approved for use in custody transfer applications –
in natural gases with a maximum hydrogen content of 10 mol-% without a
loss of the accuracy.
Since there are currently no certified test rigs in Germany to calibrate meters with
higher hydrogen-containing gases, an accuracy above 10 mol-% cannot be tested
or certified.
Not custody transfer measurements are of course possible in natural gases with a
hydrogen content above 10 mol%. However, a reduced measuring range must be
taken into account if applicable. Please contact RMG for further information.
Manual USM GT400 · EN10 · May 2021