The German Approach on Safety of Natural Gas Distribution Pipelines WORKSHOP ON THE PREVENTION OF...
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Transcript of The German Approach on Safety of Natural Gas Distribution Pipelines WORKSHOP ON THE PREVENTION OF...
The German Approach on Safety of Natural Gas Distribution Pipelines
WORKSHOP ON THE PREVENTIONOF ACCIDENTS OF GAS TRANSMISSION PIPELINES(The Hague, 8 to 9 March 2006)Klaus SöntgerathState Authority for Mining, Energy and Geology
Contents
Introduction Regulations Approval processes Governmental Control Technical Experts Risk Assessment Conclusions
Introduction
Russia; 35%
Norway; 24%
The Netherlands;
19%
Germany; 16%
UK/Denmark; 6%
Gas Pipelines in Germany
Demand of Natural Gas in 2004: 119 * 109 m³ 380.000 km of Pipelines Supplier Countries 2004:
Gas Pipeline Grid
roundabout 240 km
Scope of the paper
Pipelines for transportation and distribution of Natural Gas
Incidental pressure above 16 bars Pipelines that leave the area of a plant Pipeline includes all elements for the
operation of the pipeline
Regulations
Legislation General legislation
Energy Trade ActAct for Safety of Products and Equipment
Special legislationGas Pipeline Ordinance
e. g. safety corridor, protection against third party activities, crossing of pipelines, corrosion protection, safety equipment, pressure measurement, permanent manned station, route inspection, recording, stand-by duty
Risk assessment is not required!!!
Technical Guidelines of DVGW
Detailed rules State of the Art The following of the State of the Art is assumed if the technical
guidelines of the “DVGW - The German Technical and Scientific Association for Gas and Water“ are observed
e. g. G 463 Steel Gas Pipelines with an incidental pressure
higher than 16 bars; Construction –Working Paper- 12/01(G 463 Gasleitungen aus Stahlrohren von mehr als 16 bar Betriebsdruck; Errichtung -Arbeitsblatt- 12/01)
Technical Guidelines of DVGW
Gas Pipeline Ordinance and G 463 Requirements: e. g. materials, safety
factors, corrosion protection Risk assessment is not required!!!e. g. wall thickness
Depends on pressure, material, safety factor Constant over a whole pipeline Depends not on risks e. g. density of population
Approval Processes
1st Step - Land Use Planning Land Use Planning Act
Land Use Planning of the States Regional Land Use Planning
Land Use Planning Ordinance:gas pipelines diameter > 300 mm:Approval process for land use planning
Approval process Including assessment of spatial impacts on the environment and
public hearing Simplified approval process States or regional Land use plans include the pipeline
– no approval process on Land Use Planning necessary Decision on Land Use Planning by Regional Authority
2nd Step - Approval Process
Diameter > 300 mm Art. 43 Energy Trade Act, established: 2001
EIA needed (regulated or decision by authority) Approval process including public hearing and EIA
(Planfeststellung) EIA not needed (regulated or decision by authority)
Formal approval process without public hearing and EIA (Plangenehmigung)
Diameter < or = 300 mm: Art. 5 Gas Pipeline Ordinance;
Notification Process, established: 1974
Demands in Approval Process
Notification Process (Diameter < or = 300 mm, length > 1000 m) or included in the approval processes
The construction of a Gas Pipeline is to notify to the competent authority at least 8 weeks before beginning of the construction including all important documents of pipeline integrity including a statement of a technical expert:
The pipeline meets the requirements of the Gas Pipeline Ordinance
Demands in Approval Process
The competent authority can refuse the plan If it is not proven that the construction and operation
meets the requirements of the Gas Pipeline Ordinance
If further requirements according to the Gas Pipeline Ordinance are necessary
The construction of the pipeline can be started After 8 weeks after the information of the competent
authority In case of refusal of the plan after the elimination of
the fault(s)
Demands before Start of Operation
Before Start of Operation Pre-Certification of a technical expert about Test of tightness and stability Existing of safety equipment No doubts about pipeline integrity
Some time after the Pre-Certification Final assessment of the technical expert whether the
pipeline meets the requirements of the Gas Pipeline Ordinance
Final Certification
Governmental Control
Governmental Control
Operator has to supervise an maintain his pipelines (Operator Responsibility)
The Competent Authority can require data of the supervision can inspect the plants can require supervision measures
In special cases Inspections by technical experts because of supervision data
Announcements to the Competent Authority Setting a pipeline out of operation because of
critical circumstances Accidents that caused dangerous wounded or
killed people Leaks, dangerous for the vicinity Incidents with major material damages Circumstances that people or objects expose to
danger
Technical Experts
Certification of Technical Experts
Technical Expert Organisations Listed in Gas Pipeline Ordinance Personal certification of each Technical
Expert by the States Exchange of lists of Technical Experts
between the States
Technical Experts - Tasks
Statement for Notification Process Pre-Certification Final Certification Assessment of pipelines
e. g. in case of incidents By order of competent authority
Statement before works at pipelines in operation
Risk Assessment
An Example
Risk Assessment – Wind Turbines
To assess – risk of Wind Farms in the vicinity of Gas Pipelines
Assessed risks Loss of a rotor blade Loss of a rotor Break of the tower
Probabilistic assessment: limit 10-6 damages per year
Result: lowest distance between wind turbine and gas pipeline
Conclusions
Germany has established an hierarchic legislative System on gas pipelines (Act – Ordinance – Rules)
Approval processes for land use planning and pipeline projects are in use
Greater projects need EIA and public hearing Supervision of pipelines in operation consists of Operator
Responsibility – Authorities Control – Statements of Technical Experts
Regulations have a deterministic approach – Risk Assessments are only used in single cases