G 265-3 Code of Practice 12/2022

Content of DVGW G 265-3 Code of Practice

This DVGW G 265-3 Code of Practice serves as a basis for the planning, manufacture, construction, test, commissioning and operation of systems for the injection of hydrogen into networks for the pipeline-bound supply of gas and
hydrogen to the general public.

DVGW G 265-3 Code of Practice can also be applied to injection stations that inject hydrogen into hydrogen networks. It shall also apply to systems for feeding back hydrogen into upstream hydrogen networks.

Injection stations, to which this DVGW Code of Practice refers, are required as the link between the production plant for hydrogen and the gas infrastructure. The hydrogen can be supplied from various forms of production. The injection of hydrogen can take place both in hydrogen networks and as an injection into networks with methane-rich gases.

Compared to DVGW Guideline G 265-3:2014-05, the following amendments in particular have been made:

1. Extension of the scope to include injection as substitute gas into the 5th family of gases in accordance with DVGW G 260:2021-09; general specification of the requirements for injection into the 2nd or 5th family of gases
   DVGW G 265-3 Code of Practice 07
2. Further amendments to the scope: DVGW Code of Practice G 265-3 as a supplement to DVGW Code of Practice G 491 and G 492 with regard to hydrogen-specific requirements, connecting lines, description of the interface to DVGW Code of Practice G 220
3. Updating the normative references
4. Definition of gas mixing plants, risk assessment, hazard assessment, protection goals
5. New sub-clauses on general requirements: Use of several technical regulations within one safety concept, quality of the hydrogen at the inlet to the hydrogen injection system, risk reduction through risk assessment, risk assessment/occupational safety, water-polluting substances/environmental protection
6. New clause: Quality of the hydrogen at the inlet to the hydrogen injection system
7. New clause: Requirements for measuring technology, in particular in accordance with PTB TRG 19
8. New clause: Requirements for systems, construction elements and sub-assemblies: new requirements for material selection/materials, compressors, pipelines (including flexible pipelines and hose assemblies)
9. New clause: Functional requirements: Gas mixing, odorisation, measuring technology requirements
10. New clause: Protection against inadmissible operating conditions
11. New clause: Requirements for construction and equipment: New requirements for ventilation, exhaust and pressure relief lines, Gas Detection Systems, inertisation, hazardous areas and safety distances, fire protection
12. New clause: Requirements for test and commissioning, in particular description of a multi-stage tightness test
13. The former Annex A on gas measurement has been deleted, as this issue is already well described by PTB TRG 19.
14. New Annex A: Ex zone classification in consultation with the Ex Directive Committee
15. New Annex B: Model inspection certificate
16. New Annex C: Determination of the required mixing distance by numerical flow simulation; description of a simplified procedure for determining the minimum mixing distance under certain boundary conditions.

Table of content

• Foreword
• 1 Scope
• 2 Normative references
• 3 Terms, symbols, units and abbreviations
• 4 General requirements
• 5 Asset demarcation
• 6 Requirements for products (sub-assemblies, construction elements and components)
• 7 Functional requirements for injection station for hydrogen
• 8 Protection against inadmissible operating conditions
• 9 Requirements for plants, construction elements and sub-assemblies
• 10 Construction and equipment
• 11 Test and commissioning
• 12 Operation
• Annex A (informative) - Ex-zoning of installations for the injection of hydrogen into gas supply networks
• Annex B (informative) - Inspection certificate
• Annex C (informative) - Determination of the required mixing distance by numerical flow simulation
• References

Important normative references

DVGW Code of Practice G 100
DVGW Code of Practice G 213
DVGW Code of Practice G 260
DVGW Code of Practice G 415
DVGW Code of Practice G 463
DVGW Code of Practice G 469
DVGW Code of Practice G 472
DVGW Code of Practice G 492
DVGW Code of Practice G 493-2
DVGW Code of Practice G 495
DVGW Code of Practice G 497
DVGW Code of Practice G 2000

German version

DVGW-Arbeitsblatt G 265-3

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