SIST EN 1594:2009

Gas supply systems - Pipelines for maximum operating pressure over 16 bar - Functional requirements

This European Standard is applicable to pipelines with a maximum operating pressure (MOP) over 16 bar for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 in onland gas supply systems, where:
   the pipeline elements are made of unalloyed or low-alloyed carbon steel;
   the pipeline elements are joined by welds, flanges or mechanical couplings;
   the pipeline 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;
   the design temperature of the system is between -40 ˚C and 120 ˚C inclusive;
The standard apply to onshore pipeline systems from the point where the pipeline first crosses what is normally accepted as battery limit between on and offshore, e.g.:
   first isolation valve;
   the base of steep sea shelf;
   above the high water/low water mark onto mainland;
   an island.
The pipeline standard also applies to a pipeline system with a starting point onshore, also when parts of the pipeline system on the mainland subsequently cross fjords, lakes etc.
This European Standard does not apply to existing pipelines, in use prior to the publication of this European Standard, nor to modifications to existing pipelines.
Gas supply systems covered by this European Standard begin after the gas producer's metering station. The functional demarcation of the pipeline system within a plant area will be determined from case to case. Generally speaking, this will be directly after the first isolating valve of the installation.
This standard also describes the mechanical requirements for pipework in stations with a maximum operating pressure greater than 16 bar. Welding requirements are described in a special application standard on welding for gas supply systems EN 12732. Functional requirements for stations are given in:
EN 1776, Gas supply systems - Natural gas measuring stations - Functional re

Gasversorgungssysteme - Rohrleitungen für einen maximal zulässigen Betriebsdruck über 16 bar - Funktionale Anforderungen

Diese Europäische Norm gilt für Leitungen mit einem maximal zulässigen Betriebsdruck (MOP) im Bereich von über 16 bar, die für den Transport von aufbereitetem, nicht giftigem und nicht korrosivem Erdgas nachentsprechend
EN ISO 13686 auf dem Festland bestimmt sind und bei denen:
   die Leitungsbauteile aus nicht legiertem oder niedrig legiertem Kohlenstoffstahl bestehen;
   die Leitungsbauteile durch Schweißnähte, Flansche oder mechanische Rohrverbindungen miteinander verbunden sind;
   alle Leitungen und Anlagen, die sich auf Gewerbe- oder Werksgelände befinden, ausschließlich der Versorgung solcher Grundstücke dienen und kein wesentlicher Bestandteil der Anlagen für Betriebsabläufe auf diesem Gelände sind, und
   die Auslegungstemperatur zwischen –-40 C und +120 C liegt.
Diese Norm gilt des Weiteren für Leitungssysteme auf dem Festland, und zwar ab der Stelle, an der die Rohrleitung zuerst die üblichernormalerweise als Anlagengrenze (Battery-Limit) zwischen Festland und Meer anerkannte Stelle kreuzt, z. B.:
   der ersten Absperrarmatur;
   dem Grund eines steilen Festlandsockels;
   über der Flut-/Ebbemarke auf dem Festland;
   an einer Insel.
Diese Norm gilt auch für auf dem Festland ihren Ausgang nehmende Leitungssysteme sowie für Teile von Leitungssystemen auf dem Festland, die nachfolgend durch Fjorde, Seen usw. verlaufen.
Diese Europäische Norm gilt nicht für Leitungssysteme und deren Änderungen, die vor Veröffentlichung dieser Norm in Betrieb genommen wurden.
Das Gasversorgungssystem, für das diese Norm gilt, beginnt am Ausgang der Messstation des Gasproduzenten. Die Abgrenzung zwischen dem Leitungssystem für den Gastransport und den Stationsleitungen ergibt sich jeweils aus dem Einzelfall. Im Allgemeinen sind die Station und das Leitungssystem durch die Armaturen am Eingang und am Ausgang der Station voneinander abgegrenzt.

Systèmes d'alimentation en gaz - Canalisations pour pression maximale de service supérieure à 16 bar - Prescriptions fonctionnelles

La présente norme s'applique aux canalisations utilisées sous une pression maximale de service (MOP) supérieure à 16 bar pour le transport de gaz naturel traité non toxique et non corrosif conformément à l'ISO 13686 dans des systèmes d'alimentation en gaz terrestres dont :
   les éléments de canalisations sont en acier non ou faiblement allié ;
   les éléments de canalisations sont réunis par des soudures, des brides ou des assemblages mécaniques ;
   les canalisations ne sont pas situées sur des sites industriels, ou commerciaux en tant que partie intégrante du procédé industriel, exception faite des canalisations et dispositifs alimentant de tels sites ;
   la température de conception du réseau est comprise entre - 40 °C et 120 °C inclus.
La présente norme s’applique aux canalisations terrestres depuis le point où la canalisation traverse d’abord ce qui est normalement accepté comme périmètre des installations entre on shore et offshore :
-   première vanne de sectionnement ;
-   la base de la partie abrupte du plateau continental
-   au dessus de la marque marée haute/marée basse sur le continent ;
-   une ile.
La présente norme s’applique aussi à un système de canalisations avec un point de départ terrestre, même quand des parties du système de canalisations sur le continent traverse postérieurement des fjords, des lacs, etc.
La présente norme européenne ne s’applique pas aux canalisations existantes mises en service avant la publication de la présente norme, ni aux modifications de ces canalisations existantes.
Les systèmes d’alimentation en gaz couverts par la présente norme commencent après le poste de comptage du producteur de gaz. La limite fonctionnelle d'un tel système à l'intérieur de la station sera définie cas par cas. D'une manière générale, elle se situe juste après le premier robinet d’isolement de l'installation.

Sistemi oskrbe s plinom - Cevovodni sistemi za najvišji delovni tlak nad 16 bar - Funkcionalne zahteve

General Information

• Status: Withdrawn
• Public Enquiry End Date: 31-Oct-2008
• Publication Date: 09-Jun-2009
• Withdrawal Date: 17-Nov-2013
• ICS: 91.140.40 - Gas supply systems
• Technical Committee: DPL - Gas supply
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 15-Nov-2013
• Due Date: 08-Dec-2013
• Completion Date: 18-Nov-2013
• Mandate: M/017 - Standardization mandate to CEN in the field of equipment and installation for the transmission and distribution of gas
• Ref Project: EN 1594:2009 - Gas supply systems - Pipelines for maximum operating pressure over 16 bar - Functional requirements

Relations

• Replaces: SIST EN 1594:2000 - Gas supply systems - Pipelines for maximum operating pressure over 16 bar - Functional requirements
• Effective Date: 01-Jul-2009
• Replaced By: SIST EN 1594:2013 - Gas infrastructure - Pipelines for maximum operating pressure over 16 bar - Functional requirements
• Effective Date: 01-Dec-2013

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sistemi oskrbe s plinom - Cevovodni sistemi za najvišji delovni tlak nad 16 bar - Funkcionalne zahteveGasversorgungssysteme - Rohrleitungen für einen maximal zulässigen Betriebsdruck über 16 bar - Funktionale AnforderungenSystèmes d'alimentation en gaz - Canalisations pour pression maximale de service supérieure à 16 bar - Prescriptions fonctionnellesGas supply systems - Pipelines for maximum operating pressure over 16 bar - Functional requirements91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 1594:2009SIST EN 1594:2009en,fr,de01-julij-2009SIST EN 1594:2009SLOVENSKI
STANDARDSIST EN 1594:20001DGRPHãþD



SIST EN 1594:2009



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1594January 2009ICS 23.040.01; 75.200Supersedes EN 1594:2000
English VersionGas supply systems - Pipelines for maximum operating pressureover 16 bar - Functional requirementsSystèmes d'alimentation en gaz - Canalisations pourpression maximale de service supérieure à 16 bar -Prescriptions fonctionnellesGasversorgungssysteme - Rohrleitungen für einen maximalzulässigen Betriebsdruck über 16 bar - FunktionaleAnforderungenThis European Standard was approved by CEN on 8 December 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1594:2009: ESIST EN 1594:2009



EN 1594:2009 (E) 2 Contents Page Foreword . 5 Introduction . 6 1 Scope . 7 2 Normative references . 9 3 Definitions, symbols and abbreviations . 10 4 Quality and management systems . 14 5 Safety and the environment . 15 5.1 Introduction. 15 5.2 Appropriate safety measures . 15 5.3 Routing considerations . 15 5.4 Line valve spacing . 17 6 Pressure safety . 17 6.1 Pressure levels . 17 6.2 Normal operation . 17 6.3 Requirements for installation of pressure safety devices . 17 6.4 Pipeline with DP equal to or less than 40 bar and hoop stress equal to or less than 0,45 Rt 0,5 . 18 6.5 Pipeline with DP equal to or less than 24 bar and hoop stress equal to or less than 0,30 Rt 0,5 . 18 7 Design . 19 7.1 General . 19 7.2 Wall thickness determination. 20 7.3 Additional design requirements . 21 7.4 Analysis of stress and strain . 22 7.5 Design report . 24 7.6 Land management and geotechnical studies . 25 7.7 Depth of cover . 25 7.8 Casing pipes . 26 7.9 Station design . 26 7.10 Pipeline components . 28 7.11 Pigging suitability . 28 7.12 Arrangements for venting . 28 7.13 Corrosion protection . 29 8 Materials and components . 31 8.1 General requirements . 31 8.2 Pipes . 34 8.3 Fittings . 34 8.4 Flanged connections . 34 8.5 Insulating connections . 35 8.6 Valves . 35 8.7 External and internal coatings . 35 8.8 End preparation . 35 9 Construction . 35 9.1 General . 35 9.2 Execution of work . 36 9.3 Special crossings . 42 9.4 Cleaning . 46 SIST EN 1594:2009



EN 1594:2009 (E) 3 9.5 Testing . 46 9.6 Acceptance . 48 10 Operation and maintenance . 49 10.1 General . 49 10.2 Organisation . 49 10.3 Operating and maintenance instructions . 50 10.4 Emergency plan . 50 10.5 Records and documentation . 51 10.6 Commissioning . 51 10.7 Decommissioning . 51 10.8 Recommissioning . 51 10.9 Maintenance, modification and repair . 51 10.10 Abandonment . 54 Annex A (informative)
Settlement areas . 55 A.1 General . 55 A.2 Procedure . 55 A.3 Construction settlement . 55 A.4 Strength calculation . 56 A.5 Monitoring . 60 A.6 Action in the event of the allowable/limit values being exceeded . 60 A.7 Literature . 60 Annex B (informative)
Mining subsidence . 61 B.1 General . 61 B.2 Procedure . 61 B.3 Strength calculation . 61 B.4 Action in the event of the allowable/limit values being exceeded . 61 B.5 Monitoring . 62 B.6 Literature . 62 Annex C (informative)
Frost heave . 63 C.1 General . 63 C.2 Procedure . 63 C.3 Strength calculation . 63 C.4 Other possible measures. 63 C.5 Literature . 64 Annex D (informative)
Landslide areas . 65 D.1 General . 65 D.2 Procedure . 65 D.3 Strength calculation . 66 D.4 Possible action to prevent the allowable/limit values being exceeded . 66 D.5 Monitoring . 67 D.6 Literature . 67 Annex E (informative)
Areas with high seismic risk . 68 E.1 General . 68 E.2 Procedure . 68 E.3 Strength calculation . 69 E.4 Literature . 70 Annex F (informative)
Soil mechanics parameters. 72 F.1 Parameters . 72 F.2 Soil engineering study . 73 F.3 Literature . 73 Annex G (informative)
Bored/jacked crossings . 75 G.1 General . 75 G.2 Strength calculation . 75 G.3 Literature . 78 Annex H (informative)
Allowable pulsation and vibration levels . 79 SIST EN 1594:2009



EN 1594:2009 (E) 4 H.1 Introduction. 79 H.2 Pulsations . 79 H.3 Pipe vibrations . 79 H.4 Induced effects . 80 H.5 Literature . 80 Annex I (informative)
Allowable vibration levels from construction work - blasting . 81 I.1 General . 81 I.2 Procedure . 81 I.3 Strength calculation . 81 I.4 Literature . 82 Bibliography . 83
SIST EN 1594:2009



EN 1594:2009 (E) 5 Foreword This document (EN 1594:2009) has been prepared by Technical Committee CEN/TC 234 “Gas infrastructures”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1594:2000. There is a complete suite of functional standards prepared by CEN/TC 234 "Gas Supply" to cover all parts of the gas supply system from the input of gas to the transmission system up to the inlet connection of the gas appliances, whether for domestic, commercial or industrial purposes.
A list of the relevant functional standards prepared by CEN/TC 234 is included in Clause 2 and the Bibliography of this document.
CEN/TC 234 will continue its work updating this European Standard to the latest developments at regular intervals. In preparing this European Standard a basic understanding of gas supply by the user has been assumed. Gas supply systems are complex and the importance on safety of their construction and use has led to the development of very detailed codes of practice and operating manuals in member countries. These detailed statements embrace recognised standards of gas engineering and specific requirements imposed by legal structures of these member countries. This European Standard has been prepared under mandate M/017 given to CEN by the Commission of the European Communities and the European Free Trade Association. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 1594:2009



EN 1594:2009 (E) 6
Introduction This European Standard describes the general functional requirements for gas supply through pipe systems and covers the pressure range greater than 16 bar maximum operating pressure (MOP) for steel systems. It gives normative and informative references for safe and secure gas supply systems. It applies to their design, construction, operation and the related aspects of safety, environment and public health, all in order to provide a safe and secure supply of gas. The requirements of this European Standard are based on safe gas engineering practice under conditions normally encountered in the gas industry. Requirements for all unusual conditions cannot be specifically provided for, nor are all engineering and construction details prescribed. Existing industrial safety regulations applying to work areas, safety devices and safe work practices are not intended to be supplanted by this European Standard. Managers with responsibilities for the design, construction and operation of gas supply systems should have regard to the guidance given in this European Standard and to other relevant standards. It is the responsibility of these managers and engineers to apply these functional requirements, supplemented with other proven good practice to the particular circumstances of each gas supply system. The designer, constructor or operator of pipeline systems is cautioned that this European Standard is not a design handbook or code of practice. Additional national or company standards describing the details are needed. These detailed standards should be in line with the basic principles of this European Standard. In preparing this European Standard it was recognized that the suite of relevant European Standards is incomplete. Reference may be made where appropriate to international, national or other standards until relevant European Standards are available. SIST EN 1594:2009



EN 1594:2009 (E) 7
1 Scope This European Standard is applicable to pipelines with a maximum operating pressure (MOP) over 16 bar for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 in onland gas supply systems, where:  pipeline elements are made of unalloyed or low-alloyed carbon steel;  pipeline elements are joined by welds, flanges or mechanical couplings;  the pipeline 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;  the design temperature of the system is between -40 ûC and 120 ûC inclusive. The standard applies to onshore pipeline systems from the point where the pipeline first crosses what is normally accepted as battery limit between on and offshore, e.g.:  first isolation valve;  the base of steep sea shelf;  above the high water/low water mark onto mainland;  an island.
The pipeline standard also applies to a pipeline system with a starting point onshore, also when parts of the pipeline system on the mainland subsequently cross fjords, lakes etc. This European Standard does not apply to existing pipelines, in use prior to the publication of this European Standard, nor to modifications to existing pipelines. Gas supply systems covered by this European Standard begin after the gas producer's metering station. The functional demarcation of the pipeline system within a plant area will be determined from case to case. Generally speaking, this will be directly after the first isolating valve of the installation. This standard also describes the mechanical requirements for pipework in stations with a maximum operating pressure greater than 16 bar. Welding requirements are described in a special application standard on welding for gas supply systems EN 12732. Functional requirements for stations are given in: EN 1776, Gas supply systems - Natural gas measuring stations - Functional requirements EN 1918-5, Gas supply systems - Underground gas storage - Part 5: Functional recommendations for surface facilities EN 12186, Gas supply systems - Gas pressure regulating stations for transmission and distribution - Functional requirements EN 12583, Gas supply systems - Compressor stations - Functional requirements This European Standard specifies common basic principles for gas supply systems. Users of this European Standard should be aware that there may exist more detailed national standards and codes of practice in the CEN member countries. This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned principles. In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation shall take precedence.
Reference is made in this European Standard to relevant European and other recognized standards for products used to construct and operate gas supply systems. A schematic representation of pipelines for gas transmission is given in Figure 1.SIST EN 1594:2009



EN 1594:2009 (E) 8
KEY Figure 1 — Schematic representation of pipelines for gas supply over 16 bar
PIPELINES COVERED BY THIS STANDARD STATIONS 1 2 3 P - WELL, PRODUCTION
T - TREATMENT
D – ODORIZATION 4 S 1 -GAS RECEIVING 5 S 2 -VALVE STATION 6 S 3 -DELIVERY STATION 7 S 4 -COMPRESSOR STATION 8 S 5 -OTHER SUPPLY (E.G. FOR BLENDING) 9 S 6 -EXPORT OR IMPORT 10 S 7 -PRESSURE REGULATING 11 S 8 -DOMESTIC DISTRIBUTION 12 S 9 -INDUSTRIAL DISTRIBUTION 13 S10 –STORAGE
PIPELINES NOT COVERED BY THIS STANDARD
PRESSURE REGULATION
PRESSURE SAFETY SYSTEM
METERING SYSTEM
COMPRESSION
VALVE
ISOLATION DEVICE
SIST EN 1594:2009



EN 1594:2009 (E) 9
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1515-3, Flanges and their joints - Bolting - Part 3: Classification of bolt materials for steel flanges, class designated EN 1759-1, Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class designated - Part 1: Steel flanges, NPS 1/2 to 24 EN 10002-1, Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature EN 10204:2004, Metallic products - Types of inspection documents EN 10208-2, Steel pipes for pipelines for combustible fluids - Technical delivery conditions - Part 2: Pipes of requirement class B EN 10288, Steel tubes and fittings for onshore and offshore pipelines - External two layer extruded polyethylene based coatings EN 10289, Steel tubes and fittings for onshore and offshore pipelines - External liquid applied epoxy and epoxy-modified coatings EN 10290, Steel tubes and fittings for onshore and offshore pipelines - External liquid applied polyurethane and polyurethane-modified coatings EN 10301, Steel tubes and fittings for on and offshore pipelines - Internal coating for the reduction of friction for conveyance of non corrosive gas EN 12068, Cathodic protection - External organic coatings for the corrosion protection of buried or immersed steel pipelines used in conjunction with cathodic protection - Tapes and shrinkable materials EN 12186, Gas supply systems - Gas pressure regulating stations for transmission and distribution - Functional requirements EN 12327, Gas supply systems - Pressure testing, commissioning and decommissioning procedures – Functional requirements EN 12560-1, Flanges and their joints - Gaskets for Class-designated flanges - Part 1: Non-metallic flat gaskets with or without inserts EN 12560-2, Flanges and their joints - Gaskets for Class-designated f
...

SLOVENSKI STANDARD
kSIST prEN 1594:2008
01-oktober-2008
Sistemi oskrbe s plinom - Cevovodni sistemi za najvišji delovni tlak nad 16 bar -
Funkcionalne zahteve
Gas supply systems - Pipelines for maximum operating pressure over 16 bar - Functional
requirements
Gasversorgungssysteme - Rohrleitungen für einen maximal zulässigen Betriebsdruck
über 16 bar - Funktionale Anforderungen
Systèmes d'alimentation en gaz - Canalisations pour pression maximale de service
supérieure à 16 bar - Prescriptions fonctionnelles
Ta slovenski standard je istoveten z: prEN 1594
ICS:
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
kSIST prEN 1594:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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kSIST prEN 1594:2008

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kSIST prEN 1594:2008
EUROPEAN STANDARD
FINAL DRAFT
prEN 1594
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 23.040.01; 75.200 Will supersede EN 1594:2000
English Version
Gas supply systems - Pipelines for maximum operating pressure
over 16 bar - Functional requirements
Systèmes d'alimentation en gaz - Canalisations pour Gasversorgungssysteme - Rohrleitungen mit einem
pression maximale de service supérieure à 16 bar - maximal zulässigen Betriebsdruck über 16 bar -
Prescriptions fonctionnelles Funktionale Anforderungen
This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical
Committee CEN/TC 234.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
: This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
Warning
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1594:2008: E
worldwide for CEN national Members.

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kSIST prEN 1594:2008
prEN 1594:2008 (E)
Contents Page
Foreword .5
Introduction.6
1 Scope.7
2 Normative references.9
3 Definitions, symbols and abbreviations .10
4 Quality and management systems .14
5 Safety and the environment .15
5.1 Introduction.15
5.2 Appropriate safety measures.15
5.3 Routing considerations .15
5.4 Line valve spacing .17
6 Pressure safety.17
6.1 Pressure levels .17
6.2 Normal operation.17
6.3 Requirements for installation of pressure safety devices .17
6.4 Pipeline with DP equal to or less than 40 bar and hoop stress equal to or less than
0,45 R .18
t 0,5
6.5 Pipeline with DP equal to or less than 24 bar and hoop stress equal to or less than
0,30 R .18
t 0,5
7 Design.19
7.1 General .19
7.2 Wall thickness determination.20
7.3 Additional design requirements .21
7.4 Analysis of stress and strain .22
7.5 Design report .24
7.6 Land management and geotechnical studies .25
7.7 Depth of cover .25
7.8 Casing pipes .26
7.9 Station design.26
7.10 Pipeline components .28
7.11 Pigging suitability .28
7.12 Arrangements for venting .28
7.13 Corrosion protection.29
8 Materials and components.31
8.1 General requirements .31
8.2 Pipes .34
8.3 Fittings.34
8.4 Flanged connections .34
8.5 Insulating connections .35
8.6 Valves .35
8.7 External and internal coatings.35
8.8 End preparation.35
9 Construction .35
9.1 General .35
9.2 Execution of work .36
9.3 Special crossings.42
9.4 Cleaning .46
2

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kSIST prEN 1594:2008
prEN 1594:2008 (E)
9.5 Testing.46
9.6 Acceptance .48
10 Operation and maintenance .49
10.1 General .49
10.2 Organisation .49
10.3 Operating and maintenance instructions .50
10.4 Emergency plan.50
10.5 Records and documentation.51
10.6 Commissioning.51
10.7 Decommissioning.51
10.8 Recommissioning.51
10.9 Maintenance, modification and repair.51
10.10 Abandonment .54
Annex A (informative) Settlement areas .55
A.1 General .55
A.2 Procedure.55
A.3 Construction settlement .55
A.4 Strength calculation .56
A.5 Monitoring .59
A.6 Action in the event of the allowable/limit values being exceeded .60
A.7 Literature .60
Annex B (informative) Mining subsidence .61
B.1 General .61
B.2 Procedure.61
B.3 Strength calculation .61
B.4 Action in the event of the allowable/limit values being exceeded .61
B.5 Monitoring .62
B.6 Literature .62
Annex C (informative) Frost heave.63
C.1 General .63
C.2 Procedure.63
C.3 Strength calculation .63
C.4 Other possible measures.63
C.5 Literature .64
Annex D (informative) Landslide areas.65
D.1 General .65
D.2 Procedure.65
D.3 Strength calculation .66
D.4 Possible action to prevent the allowable/limit values being exceeded .66
D.5 Monitoring .67
D.6 Literature .67
Annex E (informative) Areas with high seismic risk .68
E.1 General .68
E.2 Procedure.68
E.3 Strength calculation .69
E.4 Literature .70
Annex F (informative) Soil mechanics parameters.72
F.1 Parameters .72
F.2 Soil engineering study.73
F.3 Literature .73
Annex G (informative) Bored/jacked crossings.75
G.1 General .75
G.2 Strength calculation .75
G.3 Literature .78
Annex H (informative) Allowable pulsation and vibration levels .79
3

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kSIST prEN 1594:2008
prEN 1594:2008 (E)
H.1 Introduction.79
H.2 Pulsations .79
H.3 Pipe vibrations.79
H.4 Induced effects .80
H.5 Literature.80
Annex I (informative) Allowable vibration levels from construction work - blasting.81
I.1 General .81
I.2 Procedure.81
I.3 Strength calculation.81
I.4 Literature.82
Bibliography.84

4

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kSIST prEN 1594:2008
prEN 1594:2008 (E)
Foreword
This document (prEN 1594:2008) has been prepared by Technical Committee CEN/TC 234 “Gas
infrastructure”, the secretariat of which is held by DIN.
This document is currently submitted to the Unique Acceptance Procedure.
This document will supersede EN 1594:2000.
There is a complete suite of functional standards prepared by CEN/TC 234 "Gas Supply" to cover all parts of
the gas supply system from the input of gas to the transmission system up to the inlet connection of the gas
appliances, whether for domestic, commercial or industrial purposes.
A list of the relevant functional standards prepared by CEN/TC 234 is included in Clause 2 and Annex A of this
document.
CEN/TC 234 will continue its work updating this European Standard to the latest developments at regular
intervals.
In preparing this European Standard a basic understanding of gas supply by the user has been assumed.
Gas supply systems are complex and the importance on safety of their construction and use has led to the
development of very detailed codes of practice and operating manuals in the member countries. These
detailed statements embrace recognised standards of gas engineering and the specific requirements imposed
by the legal structures of the member countries.
This European Standard has been prepared under mandate M/017 given to CEN by the Commission of the
European Communities and the European Free Trade Association.
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Introduction
This European Standard describes the general functional requirements for gas supply through pipe systems
and covers the pressure range greater than 16 bar maximum operating pressure (MOP) for steel systems. It
gives normative and informative references for safe and secure gas supply systems. It applies to their design,
construction, operation and the related aspects of safety, environment and public health, all in order to provide
a safe and secure supply of gas.
The requirements of this European Standard are based on safe gas engineering practice under conditions
normally encountered in the gas industry. Requirements for all unusual conditions cannot be specifically
provided for, nor are all engineering and construction details prescribed.
Existing industrial safety regulations applying to work areas, safety devices and safe work practices are not
intended to be supplanted by this European Standard.
Managers with responsibilities for the design, construction and operation of gas supply systems should have
regard to the guidance given in this European Standard and to other relevant standards. It is the responsibility
of these managers and engineers to apply these functional requirements, supplemented with other proven
good practice to the particular circumstances of each gas supply system.
The designer, constructor or operator of pipeline systems is cautioned that this European Standard is not a
design handbook or code of practice. Additional national or company standards describing the details are
needed. These detailed standards should be in line with the basic principles of this European Standard.
In preparing this European Standard it was recognized that the suite of relevant European Standards is
incomplete. Reference may be made where appropriate to international, national or other standards until
relevant European Standards are available.
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1 Scope
This European Standard is applicable to pipelines with a maximum operating pressure (MOP) over 16 bar for
the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 in onland gas
supply systems, where:
 the pipeline elements are made of unalloyed or low-alloyed carbon steel;
 the pipeline elements are joined by welds, flanges or mechanical couplings;
 the pipeline 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;
 the design temperature of the system is between -40 ˚C and 120 ˚C inclusive;
The standard apply to onshore pipeline systems from the point where the pipeline first crosses what is
normally accepted as battery limit between on and offshore, e.g.:
 first isolation valve;
 the base of steep sea shelf;
 above the high water/low water mark onto mainland;
 an island.
The pipeline standard also applies to a pipeline system with a starting point onshore, also when parts of the
pipeline system on the mainland subsequently cross fjords, lakes etc.
This European Standard does not apply to existing pipelines, in use prior to the publication of this European
Standard, nor to modifications to existing pipelines.
Gas supply systems covered by this European Standard begin after the gas producer's metering station. The
functional demarcation of the pipeline system within a plant area will be determined from case to case.
Generally speaking, this will be directly after the first isolating valve of the installation.
This standard also describes the mechanical requirements for pipework in stations with a maximum operating
pressure greater than 16 bar. Welding requirements are described in a special application standard on welding
for gas supply systems EN 12732. Functional requirements for stations are given in:
EN 1776, Gas supply systems - Natural gas measuring stations - Functional requirements
EN 1918-5, Gas supply systems - Underground gas storage - Part 5: Functional recommendations for surface
facilities
EN 12186, Gas supply systems - Gas pressure regulating stations for transmission and distribution -
Functional requirements
EN 12583, Gas supply systems - Compressor stations - Functional requirements
This European Standard specifies common basic principles for gas supply systems. Users of this European
Standard should be aware that there may exist more detailed national standards and codes of practice in the
CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of
practice setting out the above mentioned principles.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the
requirements of this European Standard, the national legislation/regulation shall take precedence.
Reference is made in this European Standard to relevant European and other recognized standards for
products used to construct and operate gas supply systems.
A schematic representation of pipelines for gas transmission is given in Figure 1.
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LEGEND STATIONS
PIPELINES COVERED BY THIS STANDARD 3 D - ODORIZATION

4 S 1 -GAS RECEIVING
PIPELINES NOT COVERED BY THIS STANDARD

5 S 2 -VALVE STATION
PRESSURE REGULATION

6 S 3 -DELIVERY STATION
PRESSURE SAFETY SYSTEM
7 S 4 -COMPRESSOR STATION

METERING SYSTEM
8 S 5 -OTHER SUPPLY (E.G. FOR

BLENDING)
COMPRESSION
9 S 6 -EXPORT OR IMPORT

VALVE
10 S 7 -PRESSURE REGULATING

ISOLATION DEVICE
11 S 8 -DOMESTIC DISTRIBUTION

12 S 9 -INDUSTRIAL DISTRIBUTION
1 P - WELL, PRODUCTION
13 S10 –STORAGE
2 T - TREATMENT
Figure 1 — Schematic representation of pipelines for gas supply over 16 bar

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2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 1515-3, Flanges and their joints - Bolting - Part 3: Classification of bolt materials for steel flanges, class
designated
EN 1759-1, Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class
designated - Part 1: Steel flanges, NPS 1/2 to 24
EN 10002-1, Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature
EN 10204, Metallic products - Types of inspection documents
EN 10208-2, Steel pipes for pipelines for combustible fluids - Technical delivery conditions - Part 2: Pipes of
requirement class B
EN 10288, Steel tubes and fittings for onshore and offshore pipelines - External two layer extruded
polyethylene based coatings
EN 10289, Steel tubes and fittings for onshore and offshore pipelines - External liquid applied epoxy and
epoxy-modified coatings
EN 10290, Steel tubes and fittings for onshore and offshore pipelines - External liquid applied polyurethane
and polyurethane-modified coatings
EN 10301, Steel tubes and fittings for on and offshore pipelines - Internal coating for the reduction of friction
for conveyance of non corrosive gas
EN 12068, Cathodic protection - External organic coatings for the corrosion protection of buried or immersed
steel pipelines used in conjunction with cathodic protection - Tapes and shrinkable materials
EN 12186, Gas supply systems - Gas pressure regulating stations for transmission and distribution -
...