G 402 Code of Practice 07/2011

Grid and damage statistics - ^ maintenance strategies for gas distribution systems ++ PDF file ++

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  • DVGW
  • 38 pages
  • available as PDF only
  • 2nd edition 2011
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  • 508592
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This Code of Practice G 402 has been elaborated by the G 401 project group within the Technical Committee on Gas distribution. It shall serve as a basis for the collection and evaluation of data to devise maintenance strategies for gas distribution systems.

Maintenance comprises inspection as well as service and repair activities. The respective DVGW Codes of Practice define the fundamental principles applying to inspection and service activities. This Code of Practice G 402 focuses on the collection and evaluation of data that form the main basis for repair planning.

The requirement for gas distribution systems to be permanently kept in a condition guaranteeing their technical safety and reliability necessitates timely and ongoing maintenance and service activities. These activities shall be planned in advance.

Maintenance strategies shall be integrated into corporate processes, the collection of major grid data being a prerequisite for introducing such strategies. Beyond this, condition‑based maintenance requires ascertaining and evaluating grid conditions by means of adequate systems. This Code of Practice describes the fundamental procedure for ascertaining, collecting and evaluating maintenance‑relevant data and offers examples illustrating how to prepare and evaluate them.

Foreword

1 Scope

2 Normative references

3 Definition of terms

3.1 As-built data

3.3 Operability

3.4 Gas distribution system

3.5 Inspection

3.6 Maintenance

3.7 Overhauling

3.8 Gas line section

3.9 Line object

3.10 In-service behaviour

3.11 Dot object

3.12 Rehabilitation

3.13 Repair

3.14 Reconstruction

3.15 Damage

3.16 Type of damage

3.17 Damage data

3.18 Damage rate

3.19 Cause of damage

3.20 Weakness

3.21 Service

3.22 Ambient data

3.23 Condition data

4 Gas distribution system maintenance ? Fundamentals

4.1 General

4.2 Maintenance strategies

4.3 Maintenance activities

5 Maintenance relevant data

5.1 General

5.2 As-built data

5.3 Damage data

5.4 Other condition data

5.5 Ambient data

6 Data collection

6.1 General

6.2 Documentation requirements

7 Data preparation and evaluation

7.1 General

7.2 Data preparation

7.2.1 As-built data preparation

7.2.2 Damage and condition data preparation

7.2.3 Ambient data preparation

7.3 Data evaluation

8 Development and control of maintenance strategies

8.1 General

8.2 Development of maintenance strategies

8.3 Control of the efficacy of a maintenance strategy

9 Maintenance planning ? Data processing systems

Annex A (informative) ? Data collection examples

Annex B (informative) ? Pipe-laying times for different pipeline materials and connection types

Annex C (informative) ? Potential criteria for defining groups

Annex D (informative) ? Condition data produced from cathodic protection system

Annex E (informative) ? Cathodic Protection (CP) based maintenance schedule

Annex F (normative) ? Special grey cast iron programme

Annex G (informative) ? Preparation of damage and condition data

Annex H (informative) ? Development of a maintenance strategy - Fundamentals

Annex I (informative) ? Forms for collecting damage, as-built and condition data (examples)