Assessment Of Serviceability According To Trgi G 600 And G 5952; General Information Regarding Leak Rate Measurement Using The Msi P7-Td - Dräger P7-TD Instruction Manual

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9.3 Assessment of serviceability according to TRGI G 600 and G 5952

Operating gas pipeline systems must be treated according to the degree of usability. The

basis for the assessment of usability is the measurement of the existing leak rate in liters

per hour (leak rate measurement). Serviceability is divided into the following criteria:

Unrestricted

Reduced serviceability =

No serviceability

If there is no serviceability, the system must be shut down immediately; if there is reduced

serviceability, the system must be repaired within 4 weeks.

The MSI P7-TD enables determining the serviceability of gas pipelines according to TRGI

G 600 and test basis G 5952 at operating pressure. This method (comparison leak meth-

od) is patented. The measuring device is approved by the DVGW for the serviceability test

under the registrations number DG-4805BS0029.

If all the consumers associated with the gas pipeline to be measured are closed by means

of valves, the user only needs to connect the gas pipeline to be tested to the measuring

device using a pressure measurement hose.

After the stabilization period for temperature equalization, the user is instructed to close

the gas supply (e.g. main shut-off valve directly behind the gas meter). Then, the pressure

in the gas pipeline is measured and after a time calculated by the measuring device, a

comparison leak is opened.

The leak rate and the volume of the tested gas pipeline are calculated and shown from the

measured pressure changes, with and without comparison leak.

The applied comparison leak method works independent of volume, temperature and

absolute pressure.

A possible effect on the measurement accuracy through pressure regulators, which remain

in the measuring section after closing the valve, can be prevented by selecting "leak

measurement with regulator". For this, the pipeline pressure is automatically reduced un-

der the nominal operating pressure set after closing the gas supply and measurement has

started, so that the pressure regulator fully opens and no gas can continue to flow during

the measurement. This does not affect the result of leak rate measurement.

!Observe the general requirements for handling combustible gases!

gas leak rate < 1 l/h

gas leak rate

gas leak rate > 5 l/h

Instruction Manual Dräger P7-TD

1 l/h to < 5 l/h

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