They ensure that gas can be used safely at all times. The DVGW Code of Practice is compulsory reading for gas suppliers, tradesmen, plumbers, engineers and anyone who deals professionally with the subject of natural gas.
Content of DVGW Code of Practice G 1010
This document DVGW Code of Practice G 1010 contains requirements for the qualification and organisation of operators of gas systems on factory premises, that are connected to the public gas supply (customer systems for internal company supply in accordance with Section 3 No. 24b EnWG). They include gas systems in the area of industrial gas use up to the last shut-off device before the gas is used.
Up to and including the last shut-off device upstream of the consumption system, these systems fall within the scope of the Energy Industry Act (§ 3, No. 15 EnWG). The DVGW Set of Rules therefore apply to these systems.
This worksheet applies to gas systems, that are operated with gases of the 2nd and 5th gas family in accordance with DVGW Code of Practice G 260.
If the gas systems are operated with natural gas-hydrogen mixtures of the 2nd gas family or with hydrogen of the 5th gas family, the guidelines for H2 readiness infrastructure, DVGW Guideline G 221, and gas application, DVGW Guideline G 655, must be observed in addition to the worksheets listed above. Annex A contains an informative overview.
For gases that do not comply with the provisions of DVGW Code of Practice G 260, this technical rule may be applied mutatis mutandis, considering the specific properties of the gases (e.g. metallurgical gases, landfill gases) and any other existing provisions.
For gases of the 3rd gas family according to DVGW Code of Practice G 260 (liquified petroleum gas), reference is made to DVGW G Code of Practice 1040 or TRF / DGUV Rule 110-010 and BetrSichV for the collective supply of liquid petroleum gas.
For biogas plants, reference is made to DVGW Code of Practice G 1030.
The aim of this Code of Practice G 1010 is to create a basis for safe supply - this includes the construction and safe operation of the gas pipeline system in accordance with the Energy Industry Act. By complying with the requirements of the DVGW regulations in this area, the points to be observed in the BetrSichV and DGUV Information 203-092 are also considerd.
If it is a closed distribution network in accordance with § 110 EnWG (supply to third parties), DVGW Code of Practice G 1000 shall be considered.
Industrial gas applications and directly associated system components are subject to the safety requirements of the relevant EG regulations and EG directives, which are described in the law on technical work equipment and consumer products (Product Safety Act - ProdSG and its subordinate regulations, e.g. Gas Appliances Regulation, 9th ProdSV and 14th ProdSV or subsequently harmonised DIN EN standards) and in particular in the Ordinance on Industrial Safety and Health (BetrSichV).
Table of contents
Foreword.
1 Scope
2 Normative references
3 Terms, symbols, units and abbreviations
3.1 Gas systems / energy systems (on factory premises)
3.1.1 Customer systems for operational self-supply
3.1.2 Closed distribution grids
3.2 Operation of gas systems on factory premises
3.3 Gas applications
3.4 Gas
3.4.1 Natural gas and hydrogen-rich methane gases
3.4.2 Hydrogen
3.5 Skilled employee
3.5.1 Operators of gas systems on factory premises
3.5.2 Technically responsible person
3.5.3 Technically skilled employee
3.5.4 Instructed person
3.6 Contractual partner
3.6.1 Operations manager
3.6.2 Service provider
4 Basic requirements
5 Tasks and fields of activity
6 Organisation
6.1 General information
6.2 Organisational structure
6.3 Process organisation
6.4 Documentation
7 Personal
7.1 Personnel qualification (own personnel)
7.2 Technically responsible person
7.2.1 Responsibilities
7.2.2 Qualification
7.2.3 Further education and training
7.3 Technically skilled employee
7.3.1 Responsibilities
7.3.2 Qualification
7.3.3 Further education and training
7.4 Instruction of the competent person
7.5 Appointed / authorised persons or designated persons
7.6 Contractual partner
7.6.1 Selection of contractual partners (external companies)
7.6.2 Monitoring of contractual partners (external companies)
7.6.3 Employees of the contractual partners
8 Technical equipment
Annex A (informative)
Annex B (informative
Important normative references
DVGW Code of Practice G 1030
DVGW Code of Pracitce G 260
DVGW Code of Practice G 492
DVGW Information Gas No. 10
DVGW Code of Practice G 497
DVGW Code of Practice G 213
German Version
DVGW-Arbeitsblatt G 1010
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Content of DVGW Information No. 10
This DVGW information No. 10 provides the operator of gas systems on plant premises with brief information on the essential tasks arising from the applicable DVGW Set of Rules for the planning, construction, alteration, operation and maintenance of gas systems and gas utilisation (e.g. gas appliances and industrial furnances). It also draws attention to other special features that shall be observed in addition to the DVGW Set of Rules for the operational use of gas. Legal provisions and official regulations and orders remain unaffected.
Table of contents
Foreword
1 Scope and general information
1.1 Scope
1.2 Gas systems and gas applications in industrial and commercial enterprises
1.3 Legal categorisation
1.4 Requirements for components
1.5 European functional standardisation and national implementation
2 Organisational and qualification requirements
2.1 Requirements for the operational organis
2.2 General requirements for the qualification of service providers and in-house personnel
3 Requirements for gas systems
3.1 General information
3.2 Pressure control station and measuring systems and gas pressure regulating systems
3.3 Pressure vessels, preheating systems and gas expansion systems
3.4 Plants for the preparation of combustible gas mixtures
3.5 Compressor stations and pressure boosting systems
3.6 Odorisation systems
3.7 Buried pipelines and above-ground pipework and its components
4 Requirements for commercial and industrial gas application
4.1 General information
4.2 Industrial furnances
4.3 Gas appliances, heating boiler systems
4.4 Gas application in power plants
4.5 Chemical applications
4.6 Energy efficiency
5 Documentation
6 Additional requirements for the use of hydrogen, natural gas-hydrogen mixtures or biogas
6.1 Hydrogen production plants and injection stations for hydrogen
6.2 Gas quality
6.3 H2 Guides for gas infrastructure and gas utilisation
6.4 Biogas installations and biogas upgrading and injection stations
7 Selection of DVGW Set of Rules at a glance
8 Occupational health and safety
9 Information, contact persons, training courses
German Version
DVGW-Information Gas Nr. 10
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Content of DVGW Guideline G 409
DVGW Guideline G 409 applies to steel gas pipelines with a design pressure greater than 16 bar with welded joints.It describes the procedure for converting a high pressure gas pipeline.G 409 applies to the high pressure gas pipeline as the whole including pipe bends, reducers, tees, caps, welding stubs.
The existing gas infrastructure has a large potential for the transport of hydrogen. Hydrogen can either betransported in its pure form or mixed with the natural gas stream.
The basic prerequisite for the use of hydrogen in the existing gas infrastructure is the technical suitabilityof the system. Here, it is particularly important to consider the possible changes in requirements causedby hydrogen. In particular, the influence on the pipework material requires precise assessment and evaluation.
For this reason, DVGW Guideline G 409 has developed specifications for a systematic procedure for the assessmentand conversion of existing high pressure gas pipelines for the operation with hydrogen. In particular, thetechnical aspects and the procedure for determining the suitability of a high pressure gas pipeline aredescribed.
Table of contents
Foreword
1 Scope
2 Normative references
3 Terms
4 Verification of hydrogen suitability
5 Expert opinion
6 Commissioning
7 Operation
8 Concluding certification Literature
Important normative references
DVGW Code of Practice G 260DVGW Guideline G 407DVGW Guideline G 408DVGW Code of Practice G 463DVGW Guideline G 464
German Version
DVGW-Merkblatt G 409
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Content of DVGW Code of Practice G 100
DVGW Code of Practice G 100 serves as a basis for assessing the competence of technical experts for inspecting the technical safety of energy systems for gas and hydrogen supply.
It specifies qualification requirements for technical experts for energy systems for the pipeline-bound supply of gas and hydrogen to the general public.
In the course of converting the gas infrastructure to hydrogen in accordance with DVGW Code of Practice G 260, technical experts have a special role to play. The qualification requirements described in this DVGW Code of Practice G 100 form the basis for the inspections to be carried out in this context. This includes, in particular,the continuous training of the technical experts in relation to the developing state of the art.
G 100 describes the qualification requirements for technical experts who inspect and assess the technical safety of gas supply energy systems on the basis of the Energy Industry Act (Energiewirtschaftsgesetz - EnWG) in accordance with the requirements of GasHDrLtgV and the DVGW Set of Rules.
The person commissioning the inspection is responsible for selecting a suitable technical expert for the inspection task in question. When commissioning a certified technical expert, the qualification for the relevant technical field can be verified by a valid certificate from a certification body accredited in accordance with GasHDrLtgV or official recognition in accordance with GasHDrLtgV. When commissioning an inspection body, the inspection body is responsible for selecting technical experts qualified for the respective inspection task. The technical expert is also responsible for checking whether his qualifications are sufficient for the inspection task. This Code of Practice G 100 can serve as a basis for this.
DVGW Code of Practice G 100 ensures that
the legal and technical framework conditions are mastered,
only well-trained persons are recognised as technical experts,
the technical experts have a practical connection to their area of specialisation,
have sound knowledge and experience in the respective area of expertise,
the specialised knowledge can be applied to specific issues in the subject area,
the tasks, possibilities and discretionary scope of the technical experts can be recognised, used andfilled.
The following amendments have been made compared to DVGW Code of Practice G 100:2015-10:
The normative references have been adapted to the current status of the DVGW Set of Rules.
The term energy facility was adapted due to the planned expansion of the term “Energy” to includehydrogen in the Energy Industry Act in order to clarify that this Code of Practice also applies to hydrogennetworks.
The designation of Area of Expertise VIb has been adapted to the contents of the 2020 edition ofDVGW Code of Practice G 472.
Notice has been included in the description of the areas of expertise that the technical experts inaccordance with this Code of Practice fulfil the qualification requirements for a person qualified toperform inspections in accordance with the German Industrial Safety and Health Ordinance(Betriebssicherheitsverordnung - BetrSichV) for testing the explosion safety of systems in their respectivearea of expertise. A corresponding explanation has been included in the foreword.
In clauses 6.4.2.2, 6.4.2.3, 6.4.2.5 and 6.4.3.8, the term "explosion protection" has been replaced by"explosion safety" in order to establish the reference to the test object in accordance with IndustrialSafety and Health Ordinance (BetrSichV).
For area of expertise IX, the required level of qualification was compared with the requirements of DINEN ISO 15257, which has replaced DIN EN 15257.
In clause 6.5.1, references to the explosion safety testing for FG II, III, V and VIII have been added asa prerequisite for initial recognition.
In Annex A, the listed Technical Rules have been adapted to the current status of Set of Rules andexpanded to include the technical rules on hydrogen systems.
Table of contents
Foreword
1 Scope
2 Normative references
3 Terms, symbols, units and abbreviations
4 Tasks of experts
5 Areas of Expertise
6 Qualification requirements
Annex A (informative) - Assignment of the regulatory documents to the Areas of Expertise
References
Important normative references
DVGW Code of Practice G 213DVGW Code of Practice G 280DVGW Code of Practice G 414DVGW Code of Practice G 463DVGW Code of Practice G 469DVGW Code of Practice G 472DVGW Code of Practice G 492DVGW Code of Practice G 497
German Version
DVGW-Arbeitsblatt G 100
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Content of DVGW Code of Practice G 1030
DVGW Code of Practice G 1030 sets out the requirements for the operators of stations for the production, transport, upgrading, conditioning or injection of biogas, irrespective of the ownership structure and organisational form, with regard to the structural and process organisation. Sufficient qualification and organisation of the operators is a prerequisite for ensuring the planning, construction, operation and maintenance of the respective biogas stations, also in compliance with safety and environmental regulations.
G 1030 specifies the requirements of the Energy Industry Act (EnWG) for the qualification and organisation of operators of plants for the production, storage, transmission, upgrading, conditioning or injection of biogas or biomethane. According to the EnWG, this also includes hydrogen from renewable sources.
DVGW Code of Practice G 1030 has been extensively revised, restructured and changes have been madein almost every section. Only major new topics are therefore listed below. Compared to DVGW Code ofPractice G 1030:2010-12, the following changes have been made in particular:
Inclusion of hydrogen from renewable sources in the scope of application in accordance with theEnWG
Inclusion of power-to-gas energy systems in the scope of application in accordance with DVGWCode of Practice G 220
Definition of power-to-gas energy plants, hydrogen feed-in plants, biogas and biomethane, contractualpartners (incl. operators, service providers, cooperation partners)
Integration of biogas conditioning system into biogas feed-in plant
Table of contents
Foreword
Authors
1 Scope
2 Normative references
3 Terms, symbols, units and abbreviations
4 Basic requirements
5 Tasks and fields of activity
6 Organisation
7 Personnel
8 Contractual partner
9 Technical equipment
Important normative references
DVGW Code of Practice G 213DVGW Code of Practice G 260DVGW Code of Practice G 415DVGW Code of Practice G 492DVGW Code of Practice G 495
German version
DVGW-Arbeitsblatt G 1030
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Content of DVGW Code of Practice G 496
DVGW Code of Practice G 496 specifies the requirements to be observed in accordance with the regulation on high pressure gas pipelines (GasHDrLtgV) to prevent hazards that may arise for employees or third parties from pipelines in compressor and expansion stations.
G 496 applies to the planning, manufacture, installation and maintenance of pipelines for gases in plants.
Table of contents
Foreword
1 Scope
2 Normative references
3 Terms, symbols, units and abbreviations
4 Planning
5 Production and construction
6 Verification of strength and tightness
7 Maintenance
Literature
Important normative references
DVGW Code of Practice G 260
German Version
DVGW-Arbeitsblatt G 496
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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 DIN CEN/TR 17924
DIN CEN/TR 17924 is written in preparation of future revision of standards dealing with the general safety, design, construction, and performance requirements and testing of safety, control or regulating devices (hereafter referred to as controls) for burners and appliances burning hydrogen (see 3.2) or hydrogen admixtures (see 3.3).
DIN CEN/TR 17924 refers to controls with declared maximum inlet pressure up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
The main target of DIN CEN/TR 17924 is to lay the ground for defining requirements and tests for controls used for safety related functions (e. g., safety valves, automatic burner control systems, gas/air ratio controls) or regulating devices.
Table of contents
European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Common properties
6 General considerations regarding design and construction
7 Performance
8 Marking, instructions
Annex
Important normative references
DIN EN 13611
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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 260
German Version
DVGW-Arbeitsblatt G 269
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This DVGW-Information GAS No. 17 provides information on how to implement the lightning protection requirements in accordance with IEC 62305 for systems of gas and hydrogen transport and distribution systemas well as for systems supplying commercial, industrial or comparable facilities.
Lightning protection measures are used to protect people, structures and technical equipment against the effects of lightning.
This
Guideline G 464 shall apply for the fracture mechanical assessment of steel gas
pipelines that already exist or are projected for construction with a design
pressure of more than 16 bar for the transportation or distribution of gases of
the 5th gas family (hydrogen) as specified by DVGW Code of Practice G 260.
This
present Guideline G 464 addresses the assessment of an assumed defect; for the
assessment of measured defects, the guideline can be applied analogously.
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).
This
guideline G 407 shall apply to the conversion of pipelines made from steel 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 16th and ends with the main shut-off valve, the custody transfer
point to DVGW G 600 (A), respectively to G 614.1 (A) (including the additions
detailed in DVGW Guideline G 655).
This
guideline can also be applied to the conversion of steel gas pipeline operated
with gases that do not conform to the specifications of DVGW Code of Practice G
260 when taking into account the gases’ specific characteristics and, if
applicable, other existing regulations. The respective guidelines on pipeline
conversion shall be consulted for networks using different pipeline materials
(e.g., plastic and steel).
For hydrogen transmission within the German gas grid, it is
imperative to obtain a clearly defined assessment of steel components for hydrogen
suitability and relevant implementation in the DVGW Codes of Practice. Within this context, DVGW
Code of Practice G 409 (for the conversion of pipelines to hydrogen transmission) and
DVGW Code of Practice G 463 (for the construction of new pipelines), for example, have
been specifically aligned to hydrogen as a transmission medium. Both these codes of practice may
require a fracture-mechanical assessment of pipelines and pipeline components, with fracture-mechanical
parameters beingrequired as input variables.
So far, it was only in ASME B 31.12 [3] that these
parameters were specified in an international code of practice. They specifically involve minimum fracture
toughness (KIc) and the description of crack toughness (da/dN) with hydrogen as a
medium. However, the parameters specified in ASME B 31.12 were based on investigations on US
materials which are verysimilar, but not identical, to the materials used in Germany
and elsewhere in Europe. Furthermore, the conversion of existing older natural gas
pipelines (comprising older materials) is of very considerable interest particularly for the scope
of application of the DVGW Code of Practice, although a direct transferability of the US
investigations was considered to be problematic.
Hence, within the context of the DVGW’s extensive SyWeSt H2
research project, fracturemechanical investigations were performed specifically for the pipeline
steel grades used in Germany (and, in some cases, elsewhere in Europe) with
hydrogen as a medium. The objective of this project was to compare the established
fracture-mechanical parameters with the results on which ASME B 31.12 is based for the purpose
of validating their application to steel grades used in Germany and, where applicable, drawing
up a modified correlation for crack growth.
In recent years, the relevant DVGW Codes of Practice and
associated information sheets for carrying out and evaluating the above-ground
inspection of natural gas pipelines have been revised. In addition, measurement
technology and data processing (digitisation) have developed constantly. For
the above-ground inspection of buried pipelines in the distribution network through
inspections and drives, new measurement methods are increasingly being used. In
the EvaNeMeL research project, these new measurement methods were evaluated
both theoretically and through experimental investigations. Five
vehicle-mounted measurement systems and three hand-held remote gas detection
methods were investigated. The results demonstrate the performance of the novel
methods against a benchmark and also to serve as a basis for a subsequent
supplement to the DVGW rules and regulations for above-ground inspection. The
benchmark was an experienced “Gasspuerer” (gas safety personnel) who carried
out a walk-through with a probe-based PortaFID M3K in parallel to the
experimental investigations. This established walk-through of buried pipelines
results in a high level of safety for the public gas supply.
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