Instruction Manual Dräger P7-TDX
16
9. Testing gas pipelines
9.1 General information
The following tests must be conducted for the installation and maintenance of gas pipe-
lines according to DVGW process sheet G600. Stress test, tightness test and serviceability
test.
In the case of new installed pipeline systems, the stress and tightness test must be con-
ducted before the pipelines are plastered or covered.
Gas can only be let into new pipeline systems or into existing pipeline systems on which
work is to be conducted if the compulsory tests have been conducted successfully.
9.2 Selection of the gas pipeline test
The following functions can be selected:
Leak Measurement
= selection of the leak rate measurement
Tightness Test
= selection of the automatic tightness test
Tightness extern Pump = Selection of the tightness test with external pump
Stress Test 0.1 MPa (1 bar)
= selection of a stress test at 0.1 MPa (1 bar)
Stress Test 0.3 MPa (3 bar)
= selection of a stress test at 0.3 MPa (3 bar)
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
=
gas leak rate < 1 l/h
Reduced serviceability =
gas leak rate 1 l/h to < 5 l/h
No serviceability
=
gas leak rate > 5 l/h
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.
