Manual Tightness Test; Testing Gas Pipelines; General Information; Selection Of The Gas Pipeline Test - Dräger P7-TD Instruction Manual

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Instruction Manual Dräger P7-TD

8. Manual tightness test

Test pressure, Stable time and measurement period can be

set during the manual tightness test.

Select measuring channel: 150, 1,000 or 25,000 hPa (mbar).

Select test pressure: 10 - 150 hPa (mbar), 100 - 1,000 hPa

(mbar) or 1,000 - 25,000 hPa (mbar).

If a tightness test was selected in the 150 hPa (mbar) meas-

uring channel, the internal or an external pump can be used,

to build up the test pressure. Tests with the 25,000 hPa

(mbar) channel can only be conducted using an external pump.

Select stabilization time: 1 min - 12 h.

Select measurement time: 1 min - 12 h.

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.

The following functions can be selected:

Leak Measurement

Tightness Test

Tightness extern Pump = Selection of the tightness test with external pump

Stress Test 0.1 MPa (1 bar)

Stress Test 0.3 MPa (3 bar)

= selection of the leak rate measurement

= selection of the automatic tightness test

= selection of a stress test at 0.1 MPa (1 bar)

= selection of a stress test at 0.3 MPa (3 bar)

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