Technical Rule – Code of Practice. DVGW G (A) |June Pressure testing methods for gas transmission/gas distribution. DVGW G – DVGW G Polyethylen gas pipelines with an operating pressure up to and including 10 bar (PE 80, PE and PE-Xa) -. Technical rule [WITHDRAWN] Article is not orderable. DVGW G Compression strength test for pipelines and facilities of gas supply.

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The pressure test must be carried out in compliance with the requirements laid down in the relevant rules and regulations, e. Each pipeline must be subjected to a pressure test after it has been laid. Pressure tests must be carried out by qualified personnel with the relevant knowledge of pipeline engineering, the execution of pressure tests, the measurement techniques and the applicable safety regulations.

Before the pressure test can be carried out, the pipeline must be covered with backfill material so as to avoid shifts in position, which could cause leaks. This applies dvw particular to pipelines with mechanical socket connections.


Hydrostatic testing

The joints need not be covered by backfill. The pipeline is to be tested over its entire length or, if necessary, in sections.

Dvwg test sections must be defined so that:. Before starting the test, the pipeline must be slowly and evenly filled with water at a rate of about 0.

Hydrostatic testing — CEPS a.s.

The main test is a test of the entire system, and in particular of the watertightness and proper execution and ddvgw of the pipes, fittings, etc. It is carried out over a period of 3 hours for pipes up to DN The pressure loss may amount to:. The water loss method see DVGW Worksheet W can be used as an equivalent alternative to the pressure loss method described above.

The test sections must be defined so that: The pressure test is carried out in a maximum of three steps. To stabilize the pipeline section when the soil has finally settled and the cement-mortar lining has absorbed sufficient water.


Water absorption in the cement-mortar pores dvggw initially cause a drop in pressure even if the pipeline is completely watertight.

For this reason it is advisable to carry out the pressure test over a period of at least 24 hours. The pressure must be brought back to the test level at regular intervals and in any case after a drop of 0.

Determines the 4469 of air still in the pipeline. Carry out as specified by the planner Main test: There are two basic test methods: The pressure loss may amount to: Drucken Teilen Xing Twitter.