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 Technical rule [WITHDRAWN] Article is not orderable.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.

The pipeline is to be tested over its entire length or, if necessary, in sections.

The test sections must be defined so that: For this reason it is advisable to carry out the pressure test over a period of at least 24 hours. Carry out as specified by the planner Main test: Determines the amount 649 air still in the pipeline.

The pressure loss may amount to:. Before starting the test, the pipeline must be slowly and evenly filled with water at a rate of about 0.

The water loss method see DVGW Worksheet W can be used as an equivalent alternative to the pressure loss method described above.

The pressure loss may amount to: To stabilize the pipeline section when the soil has finally settled and the cement-mortar lining has absorbed sufficient water.

This applies in particular to pipelines with mechanical socket connections. The pressure test is carried out in a maximum of three steps.

The pressure must be brought back to the test level at regular intervals and in any case after a drop of 0. 4469 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.

Pressure test ǀ Mannesmann Line Pipe

Drucken Teilen Xing Twitter. Water absorption in the cement-mortar pores may initially cause a drop in pressure even if the pipeline is completely watertight.

The joints need not be covered by backfill. There are two basic test methods: Each pipeline must be subjected to a pressure test after it has been laid.

Hydrostatic testing

The main test is a test of the entire system, and in particular of the watertightness and proper execution and installation of the pipes, fittings, etc. The pressure test must be carried out in compliance with the requirements laid down in the relevant rules and regulations, e. The test sections must be defined so that:. It is carried out over a period of 3 4699 for pipes up to DN Pressure tests h 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.