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1.2.5
Risk assessment and minimization
According to assessment by qualified employees of RMG, the USM GT 400 is
subject to risks during its use. Risks can also arise due to high pressures and oc-
casionally due to pressures that are too low. Work outside of the permissible tem-
perature range can also lead to dangers. Impermissible current and voltage values
can trigger explosions in explosion-prone areas. The risk assessment requires an
emptying and ventilation of the pipeline for connection of a USM GT 400. Then
and only then it is assured that there is not an explosion-prone gas mixture in the
pipeline. Naturally, work must only be carried out by trained personnel (see chap-
ter 5.3 Qualification of the personnel) who are also trained to recognize suitable
tools and use them exclusively. These risks were summarized alongside develop-
ment and measures were taken to minimize these risks.
Measures for risk minimization:
- All pressurized parts are designed in accordance with AD 2000 rules and regu-
lations, Pressure Equipment Directive, Annex 1
- The complete pressure design has been inspected by TÜV Hessen
- All pressurized parts have been manufactured with a material certificate; there
is an uninterrupted change of batch tracing of pressurized components
- The mechanical properties of all relevant pressurized components have been
subjected to tension tests, notch impact bending tests and hardness tests
- Non-destructive testing was also carried out: X-ray and ultrasonic inspection of
the meter housing for defective points in material, surface crack testing with
magnetic powder and a color penetration process
- Strength tests for components were conducted at 1.5 times the nominal pres-
sure for the pressure testing; the leak testing for the assembly was conducted
at 1.1. times the nominal pressure. Certificates were issued for successfully
passed tests.
- The maximum operating pressure and the permissible temperature range are
specified on the type plate of the device. Operation of the device is only permit-
ted within these specified ranges.
1 About this manual
Manual USM GT400 · EN10 · May 2021
11
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