NZS 5258:2003
Gas distribution networks
This Standard has two key objectives. The first is to create performance-based requirements that could be made mandatory through regulation, and a means of compliance in support of the mandatory requirements. The second objective is to take advantage of existing New Zealand and Australian Standards to articulate minimum requirements for all aspects of distribution networks covered by this Standard tailored for the New Zealand legislative and environment conditions. The Standard takes a risk assessment approach requiring hazards to be identified and either eliminated or reduced to As Low As Reasonably Practicable (ALARP) throughout the life cycle of the network system.
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
© COPYRIGHT
AMENDMENTS
CONTENTS
REFERENCED DOCUMENTS
REVIEW OF STANDARDS
FOREWORD
Road Map
PART 1 GAS DISTRIBUTION NETWORKS MANAGEMENT
1.1 Scope and general information
1.1.1 Scope and application
1.1.2 Interpretation
1.1.3 Definitions
1.1.4 Pressure classifications
1.2 Network planning
1.2.1 Basis of design
1.2.3 Network overview
1.2.4 Network safety and reliability
1.3 Network management
1.3.1 General
1.3.2 Design
1.3.3 Materials and components
1.3.4 Construction, commissioning and decommissioning
1.3.5 Network operations and maintenance
1.3.6 Training and competency
1.3.7 Accidents, emergencies, failure and near-miss investigations
1.3.8 Network performance monitoring
1.3.9 Audits
1.4 Risk assessment
1.4.1 General
1.4.2 Hazard identification
1.4.3 Risk assessment
1.4.4 Monitoring and review of hazards
PART 2 DESIGN AND INSTALLATION
2.1 Scope and general requirements
2.1.1 Scope and application
2.1.2 General safety
2.1.3 Definitions
2.1.4 Interpretation
2.1.5 Standards and specifications
2.2 Materials and components
2.2.1 General
2.2.2 Materials and components identification
2.3 Gas distribution network design
2.3.1 General
2.3.2 General network design requirements
2.3.3 Services
2.3.4 Piping for sampling
2.3.5 Isolation valves
2.3.6 Pressure control
2.3.7 Pits, vaults and above-ground enclosures
2.3.8 Corrosion protection
2.4 Construction and installation
2.4.1 General and documentation
2.4.2 Handling, transporting, storing and stringing
2.4.3 Separation from other underground structures
2.4.4 Coating for buried metal pipe
2.4.5 Pipe installation methods
2.5 Inspection, testing and commissioning
2.5.1 General
2.5.2 Inspection and test plan and procedures
2.5.3 Personnel
2.5.4 Pressure testing
2.5.5 Pneumatic pressure testing
2.5.6 Hydrostatic pressure testing
2.5.7 Commissioning
2.6 Liquefied petroleum gas distribution networks
2.6.1 Scope
2.6.2 General requirements
2.6.3 Additional requirements for liquefied petroleum gas (LPG) networks
PART 3 OPERATIONS AND MAINTENANCE
3.1 Scope and general requirements
3.1.1 Scope and application
3.1.2 General safety
3.1.3 Definitions
3.1.4 Interpretation
3.1.5 Standards and specifications
3.2 Operations and monitoring
3.2.1 Plans and procedures
3.3 Reviews, reports and analysis
3.2.2 Responsible personnel
3.2.3 Records
3.2.4 Maximum allowable operating pressure
3.2.5 Damaged pipe or component
3.2.6 Emergency response plan
3.2.7 Odorization
3.2.8 Leakage reports, response and surveys
3.2.9 Network pressure and flow control monitoring
3.2.10 Inspection of structures housing gas equipment
3.2.11 Pressure monitoring
3.2.12 Route monitoring
3.2.13 Locality monitoring and asset location information
3.2.14 Valve operability monitoring
3.2.15 Monitoring of network condition and performance, growth, pressures and flows, fringe points
3.2.16 Special inspections
3.2.17 Prevention of accidental ignition
3.3 Reviews, reports and analysis
3.3.1 Leakage reports, review and analysis
3.3.2 Corrosion control review
3.3.3 Incident reporting, review and analysis
3.3.4 Risk review
3.4 Maintenance and repair
3.4.1 General
3.4.2 Repair of coating of buried metal pipe
3.4.3 Repair of coating on above-ground pipework
3.4.4 Steel-cased crossings
3.4.5 Damaged or over-stressed sections of the gas distribution network
3.5 Work on live gas distribution networks
3.5.1 General
3.5.2 Isolation
3.5.3 Depressurization and purging before commencing work
3.5.4 Purging and pressurization after completion of work
3.5.5 Restoration of consumers’ supplies
3.5.6 Precautions during live gas operations
3.5.7 Precautions to avoid ignition of uncontrolled gas releases
3.5.8 Working in tunnels, shafts, pits, and casings
3.6 Modification and changes to operating parameters
3.6.1 General
3.6.2 Design of modifications
3.6.3 Construction, testing and commissioning of modifications
3.7 Uprating
3.7.1 Scope
3.7.2 General
3.7.3 Uprating steel gas distribution networks
3.7.4 Uprating cast iron and ductile iron gas distribution networks
3.7.5 Uprating gas distribution networks that have been operating at low pressure
3.8 Decommissioning
3.8.1 Scope
3.8.2 General
3.8.3 Inactivation of network facilities, mains and services
3.8.4 Redundant network facilities, mains and services
3.9 Corrosion control/cathodic protection
3.9.1 General
3.9.2 Qualification
3.9.3 Control of external corrosion
3.9.4 Inspection for the detection of corrosion
3.9.5 Records
3.10 LIQUEFIED PETROLEUM GAS DISTRIBUTION NETWORKS
3.10.1 General requirements
APPENDIX A RELATED STANDARDS AND SPECIFICATIONS
APPENDIX B SAFE LIFE-CYCLE OF GAS DISTRIBUTION NETWORK
APPENDIX C AS LOW AS REASONABLY PRACTICABLE
APPENDIX D COMPLIANCE CHECKLIST
APPENDIX E RISK MANAGEMENT STRATEGIES
APPENDIX F EXAMPLES OF PERFORMANCE INDICATORS
APPENDIX G WORKER COMPETENCY
APPENDIX H SELECTION OF MATERIALS, COMPONENTS AND DESIGN CONDITIONS
APPENDIX I NON-METALLIC SYSTEMS
APPENDIX J TYPICAL CLEARANCE DISTANCES FOR A SMALL GMS
APPENDIX K ASSESSMENT OF CORROSION ON PIPELINES AND CORROSION CONTROL BY CATHODIC PROTECTION
Table 1 – Pressure classifications
Table 2 – Normal cover requirements
Table 3 – Pipe identification and warning system and contents identification
Table 4 – Pneumatic test pressures and durations
Table 5 – Duration of pneumatic tests – Hours (low and medium pressure)
Table 6 – Hydrostatic test pressures and durations
Table D1 – Compliance checklist
Table E1 – Gas leakage hazards
Table E2 – Supply reliability and safety hazards
Table E3 – Decommissioning hazards
Table F1 – Gas carrying network integrity
Table F2 – Emergency performance
Table I1 – Minimum design factors for gas pipe systems –
Table I2 – Guide to maximum allowable pulling force
Table I3 – Procedure specification for jointing of polyethylene pipes and fittings
Table I4 – Changes to procedure specification for jointing of polyethylene pipes and fittings
Table I5 – Procedure specification for jointing of polyamide pipes and fittings
Table I6 – Changes to procedure specification for jointing of polyamide pipes and fittings
Table I7 – Minimum diameter of the squeeze bars
Figure C1 – The ALARP principle
Figure J1 – Clearance distances for residential GMS J1(d) Eaves Clearance distances for residential GMS
Amendments
Previous versions
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Related Information
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: Schedule 1
Citation context:NZS 5258 is the New Zealand Standard known as NZS 5258:2003 (Gas distribution networks) subject to the variation that references in this standard to AS/NZS 1596:2002 (Storage and handling of LP gas) must be read as references to AS/NZS 1596:2008 (Storage
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: 26(2)
Citation context:26 Owners and operators of distribution systems must ensure continuity of supply and safety (2) Compliance with Part 1 (network management) of AS/NZS 4645, or compliance with Part 3 of NZS 5258, is deemed to be compliance with subclause (1).
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: 25(2)
Citation context:25 Operators of distribution systems must keep records and plans (2) Compliance with either Part 3 of NZS 5258 (to the extent that that Part relates to records or plans of distribution systems), or ...
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: 27(2)
Citation context:27 Duties of owners and operators of distribution systems in relation to work carried out on systems (2) Compliance with NZS 5258 or AS/NZS 4645 is deemed to be compliance with this regulation.
Gas (Safety And Measurement) Regulations 2010
Ministry: WorkSafe New Zealand: Energy Safety
Section: 33(f)
Citation context:33 Substantive requirements of safety management systems Every safety management system must provide for the following:... ...(f) how the safety management system operator proposes to enhance continuously the safety performance of the gas supply system, including performance measurement through key performance indicators as specified in NZS 5258, internal audits, management reviews, and incident reviews; and...
Gas Regulations 1993 (Revoked)
Ministry: Ministry of Economic Development
Section: 2.2A
Citation context:'NZS 5258' means the New Zealand Standard known as NZS 5258:2003 (Gas distribution networks)
Gas Regulations 1993 (Revoked)
Ministry: Ministry of Economic Development
Section: 6(2)
Citation context:Every operator of a distribution system or of a part of a distribution system is deemed to have complied with subclause (1) in relation to that system or part if the operator has complied with Part 3 of NZS 5258 to the extent that the Part relates to reco
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
© COPYRIGHT
AMENDMENTS
CONTENTS
REFERENCED DOCUMENTS
REVIEW OF STANDARDS
FOREWORD
Road Map
PART 1 GAS DISTRIBUTION NETWORKS MANAGEMENT
1.1 Scope and general information
1.1.1 Scope and application
1.1.2 Interpretation
1.1.3 Definitions
1.1.4 Pressure classifications
1.2 Network planning
1.2.1 Basis of design
1.2.3 Network overview
1.2.4 Network safety and reliability
1.3 Network management
1.3.1 General
1.3.2 Design
1.3.3 Materials and components
1.3.4 Construction, commissioning and decommissioning
1.3.5 Network operations and maintenance
1.3.6 Training and competency
1.3.7 Accidents, emergencies, failure and near-miss investigations
1.3.8 Network performance monitoring
1.3.9 Audits
1.4 Risk assessment
1.4.1 General
1.4.2 Hazard identification
1.4.3 Risk assessment
1.4.4 Monitoring and review of hazards
PART 2 DESIGN AND INSTALLATION
2.1 Scope and general requirements
2.1.1 Scope and application
2.1.2 General safety
2.1.3 Definitions
2.1.4 Interpretation
2.1.5 Standards and specifications
2.2 Materials and components
2.2.1 General
2.2.2 Materials and components identification
2.3 Gas distribution network design
2.3.1 General
2.3.2 General network design requirements
2.3.3 Services
2.3.4 Piping for sampling
2.3.5 Isolation valves
2.3.6 Pressure control
2.3.7 Pits, vaults and above-ground enclosures
2.3.8 Corrosion protection
2.4 Construction and installation
2.4.1 General and documentation
2.4.2 Handling, transporting, storing and stringing
2.4.3 Separation from other underground structures
2.4.4 Coating for buried metal pipe
2.4.5 Pipe installation methods
2.5 Inspection, testing and commissioning
2.5.1 General
2.5.2 Inspection and test plan and procedures
2.5.3 Personnel
2.5.4 Pressure testing
2.5.5 Pneumatic pressure testing
2.5.6 Hydrostatic pressure testing
2.5.7 Commissioning
2.6 Liquefied petroleum gas distribution networks
2.6.1 Scope
2.6.2 General requirements
2.6.3 Additional requirements for liquefied petroleum gas (LPG) networks
PART 3 OPERATIONS AND MAINTENANCE
3.1 Scope and general requirements
3.1.1 Scope and application
3.1.2 General safety
3.1.3 Definitions
3.1.4 Interpretation
3.1.5 Standards and specifications
3.2 Operations and monitoring
3.2.1 Plans and procedures
3.3 Reviews, reports and analysis
3.2.2 Responsible personnel
3.2.3 Records
3.2.4 Maximum allowable operating pressure
3.2.5 Damaged pipe or component
3.2.6 Emergency response plan
3.2.7 Odorization
3.2.8 Leakage reports, response and surveys
3.2.9 Network pressure and flow control monitoring
3.2.10 Inspection of structures housing gas equipment
3.2.11 Pressure monitoring
3.2.12 Route monitoring
3.2.13 Locality monitoring and asset location information
3.2.14 Valve operability monitoring
3.2.15 Monitoring of network condition and performance, growth, pressures and flows, fringe points
3.2.16 Special inspections
3.2.17 Prevention of accidental ignition
3.3 Reviews, reports and analysis
3.3.1 Leakage reports, review and analysis
3.3.2 Corrosion control review
3.3.3 Incident reporting, review and analysis
3.3.4 Risk review
3.4 Maintenance and repair
3.4.1 General
3.4.2 Repair of coating of buried metal pipe
3.4.3 Repair of coating on above-ground pipework
3.4.4 Steel-cased crossings
3.4.5 Damaged or over-stressed sections of the gas distribution network
3.5 Work on live gas distribution networks
3.5.1 General
3.5.2 Isolation
3.5.3 Depressurization and purging before commencing work
3.5.4 Purging and pressurization after completion of work
3.5.5 Restoration of consumers’ supplies
3.5.6 Precautions during live gas operations
3.5.7 Precautions to avoid ignition of uncontrolled gas releases
3.5.8 Working in tunnels, shafts, pits, and casings
3.6 Modification and changes to operating parameters
3.6.1 General
3.6.2 Design of modifications
3.6.3 Construction, testing and commissioning of modifications
3.7 Uprating
3.7.1 Scope
3.7.2 General
3.7.3 Uprating steel gas distribution networks
3.7.4 Uprating cast iron and ductile iron gas distribution networks
3.7.5 Uprating gas distribution networks that have been operating at low pressure
3.8 Decommissioning
3.8.1 Scope
3.8.2 General
3.8.3 Inactivation of network facilities, mains and services
3.8.4 Redundant network facilities, mains and services
3.9 Corrosion control/cathodic protection
3.9.1 General
3.9.2 Qualification
3.9.3 Control of external corrosion
3.9.4 Inspection for the detection of corrosion
3.9.5 Records
3.10 LIQUEFIED PETROLEUM GAS DISTRIBUTION NETWORKS
3.10.1 General requirements
APPENDIX A RELATED STANDARDS AND SPECIFICATIONS
APPENDIX B SAFE LIFE-CYCLE OF GAS DISTRIBUTION NETWORK
APPENDIX C AS LOW AS REASONABLY PRACTICABLE
APPENDIX D COMPLIANCE CHECKLIST
APPENDIX E RISK MANAGEMENT STRATEGIES
APPENDIX F EXAMPLES OF PERFORMANCE INDICATORS
APPENDIX G WORKER COMPETENCY
APPENDIX H SELECTION OF MATERIALS, COMPONENTS AND DESIGN CONDITIONS
APPENDIX I NON-METALLIC SYSTEMS
APPENDIX J TYPICAL CLEARANCE DISTANCES FOR A SMALL GMS
APPENDIX K ASSESSMENT OF CORROSION ON PIPELINES AND CORROSION CONTROL BY CATHODIC PROTECTION
Table 1 – Pressure classifications
Table 2 – Normal cover requirements
Table 3 – Pipe identification and warning system and contents identification
Table 4 – Pneumatic test pressures and durations
Table 5 – Duration of pneumatic tests – Hours (low and medium pressure)
Table 6 – Hydrostatic test pressures and durations
Table D1 – Compliance checklist
Table E1 – Gas leakage hazards
Table E2 – Supply reliability and safety hazards
Table E3 – Decommissioning hazards
Table F1 – Gas carrying network integrity
Table F2 – Emergency performance
Table I1 – Minimum design factors for gas pipe systems –
Table I2 – Guide to maximum allowable pulling force
Table I3 – Procedure specification for jointing of polyethylene pipes and fittings
Table I4 – Changes to procedure specification for jointing of polyethylene pipes and fittings
Table I5 – Procedure specification for jointing of polyamide pipes and fittings
Table I6 – Changes to procedure specification for jointing of polyamide pipes and fittings
Table I7 – Minimum diameter of the squeeze bars
Figure C1 – The ALARP principle
Figure J1 – Clearance distances for residential GMS J1(d) Eaves Clearance distances for residential GMS
Amendments
Previous versions
NZS 5258:2003
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.