6 Installation
6.1 Requirements and recommendations
Risk of injury from explosion!
Unprofessional planning and mounting can lead to explosion hazards:
• Escaping flammable gas in case of system leaks
• Bursting of the system due to the applied gas pressure in case of insufficient strength of components or incorrect
assembly
Therefore, please note:
• All work on the gas supply system must be carried out by trained personnel only, see also section 2.2 “Personnel”,
page 4
• Observe DVGW rules and regulations. Observe national regulations.
• Carefully observe these operating instructions.
The following instructions are intended to support smooth installation of the MQMe Quantometer in the measuring system
in order to prevent damage.
1. Remove the protective film from the inlet and outlet of the meter.
2. Check the completeness of the meter (e.g. cover plugs, volume of oil supplied) and for any possible transport damage.
3. Check that the turbine wheel rotates easily and stops smoothly, e.g. by blowing into the measuring cartridge of the
MQMe Quantometer.
4. Ensure that there are no impurities, condensation, deposits or welding and drilling residues in the pipeline. It is
especially important to clean any elbow pipes in vertical installations to prevent any damage if this dirt passes through
the meter. A cone-shaped startup filter can be installed to protect the meter during its initial operation. This filter and the
collected dirt should then be removed after 4–6 weeks at the latest to prevent any disruption to the flow profile and thus
a reduction in the measuring accuracy
5. In order to achieve a high level of accuracy, it is recommended that a straight inlet pipe with a nominal size of ≥ 3 DN
and an outlet pipe with a nominal size of ≥ 2 DN are used.
6. Vibrations and pulsations should be avoided at the measurement location. The installation of a suitable compensator
can effectively dampen this kind of interference.
7. Abrupt changes in the flow rate and strong pulsating flows of gas will increase measurement errors. These issues can
arise due to e.g. frequently switching on and off the gas flow with solenoid valves. Pressure surges due to the quick
opening of valves can damage the ball bearings in the turbine wheel and cause the meter to fail.
8. Filters (with a small mesh size) should be installed upstream of the meter to protect it, in particular, against dirt particles
>50 µm both during startup and in continuous operation.
9. The gas must be dry. If condensation can occur, it is recommended that a condensate separator is installed upstream of
the meter (a separator is already integrated into some types of filter). In this case, it is recommended that the meter be
installed:
‒
with a flow direction from the top to the bottom, and
‒
not at the lowest point of the pipeline.
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