Gases are used in many areas of our everyday life - whether in private households or in industry. The DVGW regulations and standards in this section provide information on the properties of natural gas, liquefied petroleum gas and biogas. They also deal with the characteristic features of gases and the areas in which they are used.
Content of DVGW Information GAS No. 29
This DVGW Information GAS No. 29 provides an overview of the requirements that must be met for the use of hydrogen in systems for the pipeline-bound supply of the general public and the connected gas applications so that these can be labelled "H2-ready".
In this DVGW Information GAS No. 29, a model is proposed to visualise the different levels of assessment in order to classify statements on the readiness of infrastructures for the grid-based supply of hydrogen. The term "H2-ready" is used to describe this readiness for hydrogen use, which is explained in the respective context in this DVGW Information GAS No. 29.
The proposed model can also be applied analogously to new or existing plants for operational self-supply in which hydrogen is to be used, taking into account the specific legal requirements.
Safe operation with the hazardous substance natural gas is already guaranteed for gas supply networks and gas applications. If a natural gas network is converted into a hydrogen network, the same level of safety can be guaranteed if the DVGW Codes of Practice applicable to hydrogen are taken into account - without prejudice to other legal requirements.
Table of contents
Foreword
1 Scope
2 DVGW Codes of Practice
3 Terms and definitions
4 Model for the application of the term "H2-ready"
5 Assessment of the gas infrastructure and gas applications
Anhang A - Overview of important DVGW Set of Rules and the supporting H2 guidelines
Bibliography
German version
DVGW-Information GAS Nr. 29
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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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Content of DVGW Guideline G 269
G 269 provides recommendations for the quantification of gas components that can be relevant for purpose of monitoring compliance with standards.
DVGW G 269 provides recommendations for measuring the quality of gases of the 2nd and 5th gas family in accordance with DVGW Code of Practice G 260 for feeding into gas networks. This document also considers minor components of gases that are used for conditioning (biogas) gases for the purpose of feeding them into the grid.
The following changes have been made compared to DVGW Guideline G 269:2016-09
Expansion of the scope of application by including the 5th gas family
Editorial adaptation of standards, test procedures and determination methods
Inclusion of a parameter table for calculating the combustion characteristics
Consideration of additional feed-in/supply points
Table of contents
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, symbols, units and abbreviations
4 Test parameters and limit values
5 Condition determination
6 Logging/verification
Important normative references
DVGW Code of Practice G 260DVGW Code of Practice G 264DVGW Code of Practice G 488
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This Draft of Code of Practice C 260 helps to ensure the safety and health protection of persons as well as the technical integrity of pipelines, systems and system components for transporting CO₂ in pipelines made of steel pipes.
C 260 Draft Code of Practice specifies requirements for the composition of CO₂ and CO₂ streams. It establishes the framework conditions for the supply, transportation, distribution, storage and operation of systems and appliances and for commercial and industrial applications that are planned, built and operated in accordancewith the DVGW regulations (C series). It forms the basis for development, standardization and testing.
This Draft of Code of Practice C 260 describes the characteristics and requirements for the properties of a carbon dioxide stream for transportation in steel pipelines and also contains recommendations and information on the effects of CO₂ streams on the design and operation of CO₂ pipeline transportation systems.
CO₂ streams within the meaning of this regulation originate from capture processes and are transported to storage sites or for further utilization.
The capture processes are either upstream or downstream of the actual power plant or industrial process.
The following sources and emitters may be considered, for example:
Power plant processes:
Gas-fired power plants
Thermal waste treatment
Biomass power plants
Power plants with integrated gasification
Industrial processes:
Steel production
Biomethane production
Cement production
Building material production
Lime production
Chemical industry
Glass production
Foundries
The different sources of CO₂ streams result in different compositions, which in turn have a major influence on the design and operation of CO₂ transport pipelines. In the following, the possible influences and consequences of accompanying substances for transportation in steel pipelines are described in more detail.
The behaviour and transport of impurities within CO₂ streams described in this document has, where it is available, been based on experimental or operational experience. Where this experience is not currently available, a conservative figure has been used, based, for instance, on theoretical modelling. Once appropriate experience has been gained it is expected to raise some permissible levels so that unnecessary processing expense can be avoided.
This Technical Rule G 260 specifies the
requirements for the quality of fuel gases used
in the supply of the general public with gas and
sets the parameters for gas delivery, gas
transportation, gas distribution, gas storage,
operation of gas plants/systems and gas
appliances for commercial and industrial gas
applications as well as for development,
standardization, and testing.
Gases transported in separate pipelines which are
not used in the supply of the general public, or
are used as energy carrier or resource, and/or
are used in special gas appliances are not
subject to the scope of this Technical Rule.
This Technical Rule G 280 applies to all gases
covered in DVGW Codes of Practice G 260 and G 262
respectively Standards DIN EN 16723-1 and -2 as
well as DIN EN 16726 and all gases used for the
supply
via pipeline system of the general public and
other consumers with a comparable level of
safety.
When using sulfur-containing odorants, the fact
shall be taken into account that the entailed
increase of
the sulfur content in the gas is undesirable for
some applications, such as its use as basic
material in the
chemical industry.
Industrial companies using natural gas
exclusively on company premises can forego
odorization if the
operator utilizes other measures to maintain the
industrial gas plant or system’s safety.
When switching from one odorant to another,
special attention shall be paid to Section 9.
The calibration of measuring devices for odorant
control requires test gases which are detailed in
Section
10.
This document DIN CEN TR 17797 is written in preparation of
future standardization and provides guidance on how injection of H2 into the
gas infrastructure can impact processes from the input of gas into the on-shore
transmission network up to the inlet connection of gas appliances.
This Standard shall also apply, mutatis mutandis, to gas mixing plants that supply process gas to trade and industry and to industrial gas mixing plants for in‑house mixed‑gas supply.Gas mixing plants are frequently integrated into gas measurement and pressure reduction stations, which latter shall meet the specifications of DVGW Standards G 491 and G 492. In other words, most of the requirements specified in these Standards will also apply to gas mixing plants. All other requirements that go beyond the scope of G 491 and G 492 are described in this Technical Rule at hand, which first and foremost complements DVGW Standard G 491.
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