G 408 Technical Information - Guideline 08/2022 -PDF file-

Conversion of Gas Pipelines made of Plastic Pipes for the Distribution of Hydrogen-containing High-Methane Gases and Hydrogen up to16 bar Operating Pressure

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  • DVGW
  • 15 pages
  • only as PDF available
  • 1st edition 2022
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  • 512321

This guideline G 408 shall apply to the conversion of pipelines made from plastic to hydrogen-containing, methane-rich gases (2nd gas family) or hydrogen (5th gas family) in accordance with DVGW Code of Practice G 260 up to an operating pressure of 16 bar and ends with the main shut-off valve, the thematic threshold to DVGW Guideline G 655. This guideline G 408 can also be applied to the conversion of plastic gas pipeline operated with gases that do not conform to the specifications of DVGW Code of Practice G 260 if the gases’ specific characteristics and, if applicable, other existing regulations are taken into account. The respective guidelines on pipeline conversion shall be consulted for networks using different pipeline materials (e.g., plastic and steel).


1 Scope of Application

2 Normative References

3 Terms, Symbols, Units and Abbreviations

3.1 Conversion

4 Grading of Networks and Recommended Actions for the Conversion of Networks

4.1 General

4.2 Grading Networks with Consideration Towards Hydrogen Concentration and Maximum Allowable Operating Pressure (MOP)

4.3 Recommended Actions for Grading and Evaluating Gas Pipelines Made from Plastic for the Operation with Hydrogen-containing, Methane-rich Gases or Hydrogen up to 16 Bar

5 Documentation Concerning Construction, Operation, and Maintenance

5.1 General

5.2 Construction, Operation, and Maintenance Documents

6 Construction Elements and Components

6.1 General

6.2 Declaration of Conformity / Manufacturer Certificate6.3 Permeation / Permeability to Gas of Plastic Pipelines

6.4 Flow Controllers in Service Lines

7 Hydrogen Compatibility of the Gas Pipeline

7.1 General

7.2 Pressure Testing of Buried Pipelines

7.3 Odorization

 7.4 Commissioning

7.5 Test Certificate

 7.6 Operation

Annex A (informative) –Specific Gas Values of Methane-Hydrogen Mixtures