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BS EN 1594:2024

BS EN 1594:2024

$215.11

Gas infrastructure. Pipelines for maximum operating pressure over 16 bar. Functional requirements

Published By Publication Date Number of Pages
BSI 2024 72
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This document describes the functional requirements for pipelines for maximum operating pressure over 16 bar. This document also describes the mechanical requirements for pipework in stations with a maximum operating pressure greater than 16 bar. NOTE 1 Welding requirements are described in EN 12732. Functional requirements for stations are given in EN 1776, EN 1918-5, EN 12186, and EN 12583. This document is applicable for transporting gas via onshore high-pressure steel pipeline infrastructures, where the following applies: – onshore: – from the point where the pipeline first crosses what is normally accepted as battery limit between onshore and offshore, and that is not located within commercial or industrial premises as an integral part of the industrial process on these premises except for any pipelines and facilities supplying such premises; – pipeline system with a starting point onshore, also when parts of the pipeline system on the mainland subsequently cross fjords, lakes, etc. – high pressure: gas with a maximum operating pressure over 16 bar and a design temperature between −40 °C and 120 °C. – steel pipeline infrastructure: infrastructure consisting of pipeline components, such as pipes, valves, couplings and other equipment, restricted to components made of unalloyed or low alloyed carbon steel and joined by welds, flanges or mechanical couplings. – gas: non-corrosive natural gas, biomethane gas, hydrogen gas and mixtures of these gases where technical evaluation has ensured that operating conditions or constituents or properties of the gas do not affect the safe operation of the pipeline. Gas infrastructures covered by this document begin after the gas producer’s metering station. NOTE 2 The functional demarcation of the pipeline system is usually directly after an isolating valve of the installation, but can differ in particular situations. The functional demarcation of the pipeline system is usually located on an isolating valve of the installation, but can differ in particular situations. A schematic representation of pipelines for gas infrastructure is given in Figure 1. This document can also be applied to the repurposing of existing pipelines. [Figure 1 – Schematic representation of pipelines for gas supply over 16 bar] This document specifies common basic principles for gas infrastructure. Users of this standard are expected to be aware that more detailed national standards and/or code of practice can exist in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles. In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737. CEN/TR 13737 gives: – clarification of all legislations/regulations applicable in a member state; – if appropriate, more restrictive national requirements; – a national contact point for the latest information.

PDF Catalog

PDF Pages PDF Title
2 undefined
11 1 Scope
13 2 Normative references
15 3 Terms and definitions
20 4 Quality and management systems
21 5 Safety and the environment
5.1 General
5.2 Appropriate safety measures
22 5.3 Routing considerations
5.3.1 General
5.3.2 Surveys
5.3.3 Environmental impact
23 5.3.4 Ground conditions
5.4 Line valve spacing
6 Pressure safety
6.1 Pressure levels
24 6.2 Normal operation
6.3 Requirements for installation of pressure safety devices
25 6.4 Pipeline with DP equal to or less than 40 bar and hoop stress ≤ 0,45 Rt0,5
6.5 Pipeline with DP equal to or less than 24 bar and hoop stress ≤ 0,30 Rt0,5
7 Design
7.1 General
7.1.1 Design principles
7.1.2 Basis of design
7.1.2.1 Pipeline
26 7.1.2.2 Pipeline sections
7.2 Wall thickness determination
7.2.1 Straight pipe
27 7.2.2 Bends and elbows
7.3 Additional design requirements
7.3.1 Forces
28 7.3.2 Soil engineering data required
7.3.3 Structural models for pipeline sections
29 7.4 Analysis of stress and strain
7.4.1 Elastic and extended elastic design
7.4.1.1 General
7.4.1.2 Resultant stress
7.4.1.3 Allowable resultant stress
30 7.4.2 Limit state design
7.4.2.1 General
7.4.2.2 Relevant limit states
31 7.5 Design report
32 7.6 Land management and geotechnical studies
7.7 Depth of cover
7.8 Casing pipes
33 7.9 Station design
7.9.1 Layout
34 7.9.2 Components
7.9.3 Interaction with onshore pipeline section
35 7.9.4 Station pipework
7.10 Pipeline components
7.11 Pigging suitability
7.12 Arrangements for venting, recompression and flaring
36 7.13 Corrosion protection
7.13.1 General
7.13.2 External coating
7.13.2.1 External coating for above-ground pipeline sections
7.13.2.2 External coating for buried pipeline sections
37 7.13.3 Cathodic protection
7.13.3.1 Basic requirement
7.13.3.2 Electrical interference
7.13.3.3 Insulation joints
7.13.3.4 Commissioning
7.14 Grid connections
38 8 Materials and components
8.1 General
8.1.1 Base material
8.1.2 Manufacturing requirements
8.1.3 Manufacturing procedure
8.1.4 Weldability
8.1.4.1 General
8.1.4.2 Pipe
8.1.4.3 Other pipeline components
39 8.1.5 Mechanical properties
8.1.5.1 Impact energy
8.1.5.2 Impact test temperature
8.1.5.3 Tensile properties
40 8.1.5.4 Hardness of welds
8.1.5.5 Properties after forming and heat treatment
8.1.6 Inspection documents
8.1.6.1 Manufacturing under a comprehensive quality system
8.1.6.2 Manufacturing not under a comprehensive quality system
8.1.6.3 Small components
8.1.7 Other steel types or grades
8.1.8 Records
8.2 Pipes
41 8.3 Fittings
8.3.1 General
8.3.2 Manufacturing
8.4 Flanged connections
8.5 Insulating connections
8.5.1 Type test
8.5.2 Strength test
42 8.5.3 Electrical test
8.5.4 External tightness test
8.6 Valves
8.7 External and internal coatings
8.8 Welding end preparation
9 Construction
9.1 General
9.2 Execution of work
9.2.1 General
9.2.2 Marking out the site
43 9.2.3 Initial site inspections
9.2.4 Working strip
9.2.5 Separation of topsoil
9.2.6 Trenches
44 9.2.7 Crossing and proximity of buried structures (cables and pipes)
9.2.8 Handling and stringing
45 9.2.9 Bends
9.2.9.1 Elastic bends
9.2.9.2 Field bends
9.2.10 Welding and weld examination
9.2.11 External coating
9.2.11.1 General
46 9.2.11.2 Surface preparation, application conditions
9.2.11.3 Coating welded joints and uncoated parts of pipes
9.2.11.4 Repairing the coating
9.2.11.5 Coating valves, fittings and cable-to-pipe connections
47 9.2.11.6 Inspections
9.2.11.7 Mechanical protection
9.2.11.8 Rocky ground
48 9.2.11.9 Trenchless
9.2.12 Lowering into the trench
9.2.13 Ballasting and anchoring
9.2.14 Tie-ins
9.2.15 Backfill
49 9.2.16 Reinstatement
9.2.17 Markings
9.2.18 Final site inspection with owners and users
9.3 Special crossings
9.3.1 General
9.3.2 Open-trench road or path crossings
50 9.3.3 Trenchless crossings
53 9.3.4 Requirements for casings
9.3.5 Open trench major water crossings
9.3.6 Horizontal directional drilling
54 9.4 Cleaning
9.5 Testing
9.5.1 General
55 9.5.2 Test preparation
9.5.3 Strength test
9.5.4 Tightness test
56 9.5.5 Pre-testing
9.5.6 Dewatering
9.5.7 Golden welds
9.6 Acceptance
9.6.1 As-built documents
9.6.2 Pre-commissioning
57 9.6.3 Handover and documentation
10 Operation and maintenance
10.1 General
10.1.1 Policy
10.1.2 Safety and environment
10.2 Organization
58 10.3 Operating and maintenance instructions
59 10.4 Emergency plan
10.5 Records and documentation
10.6 Commissioning
60 10.7 Decommissioning
10.8 Recommissioning
10.9 Maintenance, modification, and repair
10.9.1 General
10.9.2 Pipeline surveillance, inspection and monitoring
61 10.9.3 Execution of repairs and modifications
10.9.4 Work involving cutting of the pipeline
10.9.5 Work on in-service pipelines
62 10.9.6 Repairs after emergency
10.9.7 Other and special maintenance activities
63 10.10 Introduction of hydrogen in existing natural gas pipelines
10.11 Abandonment and removal
64 Annex A (normative)Requirements for fracture arrest of line pipe
A.1 General
65 A.2 CVN impact test
67 A.3 Drop weight tear test
A.4 Test pieces, method, and frequency for CVN and DWT tests
68 Annex B (informative)Hydrogen gas pipelines
B.1 General
B.2 New pipelines
B.3 Existing pipelines
69 B.4 Other considerations

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BS EN 1594:2024
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