G 265-1 Code of Practice 03/2014

Plants for the Upgrading and Injection of Biogas into Gas Supply Grids; Part 1: Design, Manufacture, Construction, Testing and Commissioning ++ PDF file ++

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  • DVGW
  • 53 pages
  • available as PDF only
  • 2nd edition 2014
  • 1
  • 1
  • 509404
ST
This Code of Practice G 265‑1 serves as a basis for designing, manufacturing, constructing, testing and commissioning plants for upgrading biogas to natural gas quality, plants for injecting these gases into gas transmission and distribution systems, and plants for the refeeding of gas into the upstream gas supply network.

This DVGW Code of Practice provides a summary overview of the minimum requirements on the technical safety of plants and components required for the utilisation of biogas, from upgrading plants through to compressor stations; pressure control here. The injection into the gas supply network as added or substitute gas. At the same time, one focus was on the indispensable coordination between the generally different plant operators.
Foreword

1 Scope of application

2 Normative references

3 Terms, symbols, units and abbreviations

3.1 Plant

3.2 Raw biogas

3.3 Biogas H, biogas L

3.4 Biogas production plant (BPP)

3.5 Biogas upgrading plant (BUP)

3.6 Biogas injection plant (BIP)

3.7 Refeeding plant

3.8 Process measuring and control technology
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3.8.1 Monitoring and control devices

3.8.2 Safety Instrumented System (SIS)

3.8.3 Limiters

3.9 Mechanical safety devices

3.10 Compressor

3.11 Expert

3.12 Technical experts

3.13 Competent persons qualified to conduct tests to verify protection against electrical hazards

3.14 Competent persons qualified to conduct tests on explosion protection

4 General requirements

4.1 Coordination requirements and definition of interfaces

4.2 Requirements on the composition of upgraded biogas

4.3 Qualification requirements for plant design and manufacturing

4.4 On-site plant overview

4.5 Explosion protection 4.6 Hydrogen sulphide

4.7 Substances hazardous to water

5 Plant boundaries

5.1 Connections

5.2 Ancillary facilities

6 Biogas upgrading methods

7 Functional requirements

7.1 General functional requirements

7.2 Backflow and refeeding

7.2.1 General requirements

7.2.2 Unintentional backflow from a biogas upgrading plant

7.2.3 Unintentional backflow from a biogas injection plant

7.2.4 Process-related controlled refeeding 7.3 Functional requirements on biogas upgrading plants (BUP)

7.4 Functional requirements on biogas injection plants (BIP)

7.5 Functional requirements on plants for refeeding gas into upstream gas supply networks

8 Protection against inadmissible operating modes

8.1 Joint requirements

8.1.1 General

8.1.2 SIS and mechanical safety devices

8.1.3 Plant emergency shut-off

8.1.4 Protection against inadmissible overpressure

8.1.5 Protection against inadmissible underpressure

8.1.6 Protection against inadmissible gas temperatures8.1.7 Monitoring of ambient atmosphere 8.2 Special requirements on biogas upgrading plants

8.2.1 Protection against inadmissible underpressure and against the intrusion of outside air

8.3 Special requirements on biogas injection plants

8.3.1 Protection against the injection of gas of inadmissible composition

9 Requirements on plants, components and assemblies

9.1 General 9.2 Joint system requirements

9.2.1 Compressor stations

9.2.1.1 General requirements

9.2.1.2 Process control requirements

9.2.1.3 Sealing system

9.2.1.4 Electrical machines

9.2.1.5 Gas cooling systems

9.2.2 Mechanical safety devices for protection against inadmissible over and underpressure

9.2.3 Shut-off valves

9.2.4 Pipework

9.2.4.1 General requirements

9.2.4.2 Exhaust and depressurising lines

9.2.5 Non-storage pressure vessels

9.2.5.1 Filters, gas dryers and liquid separators

9.2.5.2 Expansion reservoirs

9.2.6 Function test equipment

9.3 Biogas upgrading plants

9.3.1 Pipework

9.3.1.1 Plastic pipework

9.3.1.2 Exhaust pipes

9.4 Biogas injection plants

9.4.1 Pressure regulating stations

9.4.2 Gas composition analysis

9.4.3 Gas measuring stations

9.4.4 Conditioning systems

9.4.5 Odorisation

9.5 Refeeding plants

9.5.1 Deodorisation

10 Construction and equipment

10.1 Structural requirements

10.1.1 Housing

10.1.2 Transport and escape routes

10.1.3 Installation in residential or commercially used buildings

10.1.4 Noise control

10.1.5 Apertures into the installation space

10.1.6 Walls, ceilings, roofs and ducts

10.1.7 Isolation of gas flow outside of the place of installation

10.1.8 Ventilation of the place of installation

10.1.9 Outdoor plant design

10.1.10 Working areas

10.1.11 Protection against harmful external influences

10.1.12 Safety marking

10.1.13 Corrosion protection

10.1.14 Installation of odorisation systems10.2 Electro-technical requirements10.2.1 Electrical equipment 10.2.2 Electrical resistance of floor coverings

10.2.3 Lighting equipment

10.2.4 Cable ducts

10.2.5 Insulating joints

10.2.6 Lightning protection and equipotential bonding

10.2.6.1 Protective equipotential bonding

10.2.6.2 External and internal lightning protection, lightning protective equipotential bonding

11 Testing

11.1 Tests carried out by the manufacturer

11.2 Tests at the place of installation

11.2.1 Compliance with safety-related approval and structural requirements

11.2.2 Connections to the plant

11.2.3 Tightness

11.2.4 Function

11.2.5 Explosion protection

11.2.6 Deviations from this Technical Rule 11.3 Testing of electrical systems and equipment

11.4 Tests for design pressures above 16bar

11.5 Proof of testing

11.5.1 Testing by the manufacturer

11.5.2 Testing at the place of installation

11.5.4 Testing of electrical systems and equipment

11.5.5 Documentation

12 Commissioning

Annex A (informative) ? Potential coordination requirements between plant operators

Annex B (informative) ? Hazardous area zone classification in biogas upgrading and injection plants

Annex C (informative) ? Compressor unit specification data sheet

Annex D (normative) ? Test schedule Annex E (normative) ? Test ratings in accordance with Clause 11

Bibliography