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Instruction Manual Dräger P7-TDX
10. Testing LPG pipelines
10.1 Tech. Regulations Liquid Gas (German Technische Regeln Flüssiggas -
TRF)
10.1.1 General information
The flawless condition of liquid gas systems must be checked by authorized experts, tech-
nical experts and/or specialized service centers:
- before initial commissioning,
- after modifications,
- after an interruption of operations of more than one year,
- periodically.
Filling a stationary liquid gas tank with liquid gas is presumed to be commissioning.
The following are required tests: Strength test and tightness test.
10.1.2 Strength test
Apply 1.1 times the value of the permissible positive operating pressure however, at least
0.1 MPa (1 bar) to the pipeline by means of air or nitrogen.
Wait at least 10 minutes; in the case of partially underground pipelines, 30 minutes.
Read the pressure on the test pressure gauge (measurement accuracy 1 % from measur-
ing range end value).
At the earliest, check pressure on the test pressure gauge for pressure drop after an addi-
tional 10 minutes.
10.1.3 Tightness test
Immediately before commissioning, all pipelines up to the adjustment elements of the de-
vices must be checked for tightness with a positive pressure of 150 hPa (mbar) using air.
The pipelines are considered tight if the test pressure does not drop during the subsequent
test time of 10 minutes after temperature equalization.
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