G 404 Guideline 07/2023

Content of DVGW Guideline G 404

DVGW Guideline G 404 introduces provisions for the technical reduction of emissions in the Gas Infrastructure.

Many of the measures listed in this DVGW-Guideline G 404 have already been used in the gas infrastructure for years for safety reasons, but if applied promptly, they also lead to a reduction in emissions and thus make an important contribution to environmental relief. 
The main measures used in practice are listed in G 404. According to the current state of knowledge, these can also be used in networks for hydrogen-containing methane-rich gases (2nd gas family) and for hydrogen (5th gas family) in accordance with DVGW Code of Practice G 260.

The German gas network consists of different materials and nominal diameters and already has very low methane emissions. 
In particular, the constantly updated requirements from the DVGW regulations regarding maintenance have led to a continuous reduction in methane losses in the German gas industry in recent years.
Methane emissions have various natural and man-made sources. They account for a total of 6 % of all green-house gases in Germany, which are mainly produced in agriculture and waste management, but also partly in the energy industry using coal, oil and natural gas. According to the current status, the German gas infrastructure accounts for methane emissions, which correspond to 0.08 % of the total anthropogenic greenhouse gas emissions in Germany of 760 million tonnes of CO2 equivalent in 2021. These arise from the transport and distribution of methane-rich gas and are to be further reduced through technical measures.

Table of contents

• Foreword
• 1 Scope
• 2 Normative references
• 3 Terms, symbols, units and abbreviations
• 4 Types of gas emissions
• 5 Localisation of gas emission sources in the gas infrastructure
• 6 Measures to reduce gas emissions in the gas infrastructure
• References

Important normative references

DVGW Code of Practice G 260

DVGW Code of Practice G 265-2

DVGW Code of Practice G 441

DVGW Guideline G 452-1

DVGW Code of Practice G 465-2

DVGW Code of Practice G 491

DVGW Code of Practice G 600

DVGW Code of Practice GW 10

DVGW Guideline GW 18

DVGW Code of Practice GW 27

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