Gas infrastructure - Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations - Part 2: Detailed functional requirements for commissioning, operation and maintenance

This European Standard specifies detailed functional requirements for the commissioning, operation and maintenance of
•   industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of
•   non-industrial installations (residential and commercial) with an operating pressure greater than 5 bar,
starting from the outlet of the network operator’s point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This European Standard also covers the inlet connection to the gas appliance comprising of the pipework that does not fall within the scope of the appliance standard.
This standard applies to gas installations operating at ambient temperatures between –20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should additionally be made to EN 13480 for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non-industrial (residential and commercial) gas installations up to and including 5 bar EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European Standards, this European Standard applies.
In this European Standard, the term “gas“ refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure. These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases (see table 1 of EN 437:2003).
LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure (e.g. between the storage vessel and its pressure regulator).
In this European Standard, all pressures are gauge pressures unless otherwise stated.
For gas installations within the scope of this standard, national legisl

Gasinfrastruktur - Gas-Leitungsanlagen mit einem Betriebsdruck größer 0,5 bar für industrielle Installationen und größer 5 bar für industrielle und nicht-industrielle Installationen - Teil 2: Detaillierte funktionale Anforderungen an Inbetriebnahme, Betrieb und Instandhaltung

Diese Europäische Norm legt detailliert die funktionalen Anforderungen hinsichtlich Inbetriebnahme, Betrieb und Instandhaltung von
   industriellen Gasleitungsanlagen und Baugruppen mit einem Betriebsdruck größer 0,5 bar und
   nicht industriellen Gasleitungsanlagen in Gebäuden (Haushalte und Gewerbebetriebe) mit einem Betriebsdruck größer 5 bar,
beginnend am Ausgangsanschluss der Übergabestelle des Netzbetreibers bis zum Eingang der Gasgeräte; d. h. in der Regel der Absperreinrichtung vor dem Gerät, fest. Diese Europäische Norm gilt auch für die Anschlussleitungen von Gasgeräten, die nicht in den Anwendungsbereich der Gasgeräte-Norm fallen.
Diese Europäische Norm gilt für den Betrieb von Gasleitungsanlagen bei Umgebungstemperaturen zwischen 20 °C und 40 °C mit Betriebsdrücken bis einschließlich 60 bar. Bei Betriebszuständen außerhalb dieser Bereiche wird zusätzlich auf die EN 13480 für metallische Leitungsanlagen verwiesen.
Für Gasleitungsanlagen mit Betriebsdrücken bis einschließlich 0,5 bar und für nicht industrielle Gasleitungs-anlagen (in Haushalten und Gewerbebetrieben) mit Betriebsdrücken bis einschließlich 5 bar gilt EN 1775.
Die vorliegende Europäische Norm gilt für Gasleitungsanlagen, die nicht in den Anwendungsbereich der EN 1775 oder einer anderen Europäischen Norm fallen.
In der vorliegenden Europäischen Norm bezeichnet der Begriff Gas brennbare Gase, die bei einer Temperatur von 15 °C und einem absoluten atmosphärischen Druck von 1 013 mbar in gasförmigem Zustand vorliegen. Diese Gase werden im Allgemeinen als erzeugtes Gas, Erdgas oder Flüssiggas (LPG) oder als Gase der ersten, zweiten oder dritten Gasfamilie bezeichnet (siehe Tabelle 1 in EN 437:2003).

Systèmes d'alimentation en gaz - Canalisations d'installation de gaz avec une pression de service supérieure à 0,5 bar pour les installations industrielles et supérieure à 5 bar pour les installations industrielles et non industrielles - Partie 2: Exigences fonctionnelles détaillées pour la mise en service, l'exploitation et la maintenance

La présente norme spécifie les exigences fonctionnelles détaillées relatives à la mise en service, à
l’exploitation et à la maintenance:
⎯ des installations et ensembles de gaz industriels fonctionnant à une pression supérieure à 0,5 bar et
aux
⎯ installations de gaz non industrielles (résidentielles et commerciales) fonctionnant à une pression
supérieure à 5 bar
allant de la sortie du point de livraison de l’opérateur de réseau jusqu’à la connexion d’entrée de l’appareil à
gaz, normalement le robinet de sectionnement d’entrée. Cette norme couvre aussi la connexion d’entrée de
l’appareil à gaz comprenant la tuyauterie qui n’est pas couverte par la norme de l’appareil.
La présente norme s’applique aux installations de gaz fonctionnant à des températures ambiantes comprises
entre –20 °C et 40 °C et des pressions de service inférieures ou égales à 60 bar. Pour des conditions
d’exploitation à l’extérieur de ces limites, il convient qu’il soit fait référence à la norme EN 13480 concernant
les tuyauteries métalliques.
Pour les installations de gaz industrielles inférieures ou égales à 0,5 bar et pour les installations de gaz non
industrielles (résidentielles et commerciales) fonctionnant à une pression inférieure ou égale à 5 bar, c’est
l’EN 1775 qui s’applique.
La présente norme s’applique aux installations de gaz qui n’entrent pas dans le domaine d’application de la
norme EN 1775 ou d’autres normes européennes.
Dans la présente Norme, le terme “gaz“ se rapporte à des gaz combustibles se présentant sous forme
gazeuse à 15 °C et à 1 013 mbar de pression atmosphérique absolue. Ces gaz sont couramment appelés gaz
manufacturés, gaz naturel ou gaz de pétrole liquéfié (GPL). Ils sont aussi dénommés gaz de la 1ère, 2e ou 3e
famille respectivement (voir le Tableau 1 de l’EN 437:2003).
Les réservoirs de stockage de GPL (y compris tous les accessoires fixés directement sur les réservoirs) sont
exclus.

Infrastruktura za plin - Plinske napeljave z delovnim tlakom nad 0,5 bar za industrijsko uporabo in delovnim tlakom nad 5 bar za industrijsko in neindustrijsko uporabo - 2. del: Podrobne funkcionalne zahteve za začetek obratovanja, obratovanje in vzdrževanje

General Information

Status
Published
Publication Date
11-Nov-2008
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
12-Nov-2008
Completion Date
12-Nov-2008

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gasversorgungssysteme - Gas-Leitungsanlagen mit einem Betriebsdruck größer 0.5 bar für industrielle Installationen und größer 5 bar für industrielle und nicht-industrielle Installationen - Teil 2: Detaillierte funktionale Anforderungen an Inbetriebnahme, Betrieb und InstandhaltungAlimentation en gaz - Tuyauteries sous pression de service supérieure à 0,5 bar pour installations

industrielles et supérieures à 5 bar pour les installations industrielles et non industrielles - Partie 2: Exigences fonctionnelles détaillées pour la mise en service, l'exploitation et la maintenanceGas infrastructure - Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations - Part 2: Detailed functional requirements for commissioning, operation and maintenance91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 15001-2:2008SIST EN 15001-2:2009en,fr01-junij-2009SIST EN 15001-2:2009SLOVENSKI

STANDARD
SIST EN 15001-2:2009

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15001-2November 2008ICS 23.040.01; 91.140.40 English VersionGas infrastructure - Gas installation pipework with an operatingpressure greater than 0,5 bar for industrial installations andgreater than 5 bar for industrial and non-industrial installations -Part 2: Detailed functional requirements for commissioning,operation and maintenanceSystèmes d'alimentation en gaz - Canalisationsd'installation de gaz avec une pression de servicesupérieure à 0,5 bar pour les installations

industrielles etsupérieure à 5 bar pour les installations industrielles et nonindustrielles - Partie 2: Exigences fonctionnelles détailléespour la mise en service, l'exploitation et la maintenanceGasversorgungssysteme - Gas-Leitungsanlagen mit einemBetriebsdruck größer 0.5 bar für industrielle Installationenund größer 5 bar für industrielle und nicht-industrielleInstallationen - Teil 2: Detaillierte funktionaleAnforderungen an Inbetriebnahme, Betrieb undInstandhaltungThis European Standard was approved by CEN on 11 October 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© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15001-2:2008: ESIST EN 15001-2:2009

EN 15001-2:2008 (E) 2 Contents Page Foreword..............................................................................................................................................................3 1 Scope......................................................................................................................................................4 2 Normative references............................................................................................................................4 3 Terms and definitions...........................................................................................................................5 3.1 Definitions relating to pressure............................................................................................................5 3.2 Definitions relating to the gas installation..........................................................................................5 3.3 Definitions relating to means of isolation...........................................................................................6 3.4 Definitions relating to components.....................................................................................................6 3.5 Definitions relating to tests..................................................................................................................7 3.6 Definitions relating to commissioning, operation and maintenance...............................................7 3.7 Definitions relating to pressure regulating and metering.................................................................8 4 General....................................................................................................................................................8 4.1 Technical file..........................................................................................................................................8 4.2 Changes affecting an existing installation..........................................................................................9 4.3 Quality system.......................................................................................................................................9 4.4 Protection against hazards...................................................................................................................9 4.5 Protection against adverse influences..............................................................................................10 5 Commissioning....................................................................................................................................10 5.1 General..................................................................................................................................................10 5.2 Purging.................................................................................................................................................10 6 Operation and maintenance...............................................................................................................11 6.1 Requirements involving operation and maintenance......................................................................11 6.2 Operation..............................................................................................................................................12 6.3 Maintenance.........................................................................................................................................14 Bibliography......................................................................................................................................................21

SIST EN 15001-2:2009

EN 15001-2:2008 (E) 3 Foreword This document (EN 15001-2:2008) has been prepared by Technical Committee CEN/TC 234 “Gas supply”, 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 May 2009, and conflicting national standards shall be withdrawn at the latest by May 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. There is a complete suite of functional standards prepared by CEN/TC 234 “Gas infrastructure” 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. In preparing this standard, a basic understanding of gas supply by the user has been assumed. In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, national legislation/regulation takes precedence as illustrated in CEN /TR 13737. NOTE CEN/TR 13737 contains:

- clarification of relevant legislation/regulations applicable in a country;
- if appropriate, more restrictive national requirements;

- national contact point for the latest information. 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. 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 15001-2:2009

EN 15001-2:2008 (E) 4 1 Scope This European Standard specifies detailed functional requirements for the commissioning, operation and maintenance of

• industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of

• non-industrial gas installations (residential and commercial) with an operating pressure greater than 5 bar,

starting from the outlet of the network operator’s point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This European Standard also covers the inlet connection to the gas appliance comprising of the pipework that does not fall within the scope of the appliance standard. This standard applies to gas installations operating at ambient temperatures between –20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should additionally be made to EN 13480 for metallic pipework. For industrial gas installations up to and including 0,5 bar and for non-industrial (residential and commercial) gas installations up to and including 5 bar EN 1775 applies. For gas installations that do not fall within the scope of EN 1775 or other European Standards, this European Standard applies. In this European Standard, the term “gas“ refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure. These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases (see table 1 of EN 437:2003). LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure (e.g. between the storage vessel and its pressure regulator). In this European Standard, all pressures are gauge pressures unless otherwise stated. For gas installations within the scope of this standard, national legislation and regulations have to be taken into account. Functional requirements for design, selection of materials, construction, inspection and testing of industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of gas installations greater than 5 bar in buildings and areas intended for residential, commercial, public and mixed uses are described in prEN 15001-1. 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 12954, Cathodic protection of buried or immersed metallic structures — General principles and application for pipelines prEN 15001-1, Gas installation pipework with an OP greater than 05 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations — Part 1: Detailed functional requirements for design, materials, construction, inspection and testing SIST EN 15001-2:2009

EN 15001-2:2008 (E) 5 EN 60079-10, Electrical apparatus for explosive gas atmospheres — Part 10: Classification of hazardous areas (IEC 60079-10:2002) EN 60079-14, Electrical apparatus for explosive gas atmospheres — Part 14: Electrical installations in hazardous areas (other than mines) (IEC 60079-14:2002) EN 60079-17, Explosive atmospheres — Part 17: Electrical installations inspection and maintenance (IEC 60079-17:2007) EN 60079-29-1, Explosive atmospheres — Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases (IEC 60079-21-1:2007, modified)

3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Definitions relating to pressure 3.1.1 pressure gauge pressure of the fluid inside the system, measured in static conditions 3.1.2 design pressure (DP) pressure at which the design calculations are based; this is equivalent to the maximum allowable pressure (PS) as given in the PED 3.1.3 operating pressure (OP) pressure which occurs within pipework under normal operating conditions 3.1.4 maximum incidental pressure (MIP) maximum pressure which pipework can experience during a short time, limited by the safety devices 3.2 Definitions relating to the gas installation 3.2.1 pipework assembly of pipes and fittings 3.2.2 components any item from which a gas supply system or installation is constructed. A distinction is drawn between the following groups of components:  ancillaries (for example pressure regulators, valves, safety devices, expansion joints, and insulating joints);  pipes, including bends made from pipe;  instrumentation pipework;  fittings (for example reducers, tees, factory-made elbows, flanges, dome ends, welding stubs, and mechanical joints) SIST EN 15001-2:2009

EN 15001-2:2008 (E) 6 3.2.3 point of delivery point where the gas is transferred to the user. NOTE This can be at a means of isolation or at the meter outlet connection and is normally at the point of transfer of ownership. 3.2.4 user(s) person(s) responsible for the safety of the gas installation and associated risks on a site NOTE Normally the user will be the site occupier or owner. It should be assumed that every user has a responsibility for work performed on their site, whether or not the work is performed directly for the user or not. This does not mean that they cannot take advice from an independent specialist. 3.2.5 installation pipework pipework including components and stations downstream of the point of delivery terminating at the appliance inlet connection NOTE This pipework is normally the property of the customer 3.2.6 ventilated space space where the air is continuously changed by natural or mechanical means 3.2.7 duct space specifically designed and constructed for the passage of building services EXAMPLE Building services include gas pipework, water systems, power and telecommunication cables 3.2.8 ventilation duct duct forming part of the structure of the building and intended exclusively for ventilation purposes 3.3 Definitions relating to means of isolation 3.3.1 means of isolation device that is intended to interrupt the gas flow in pipework EXAMPLE a manually operable valve 3.4 Definitions relating to components 3.4.1 regulator

device which reduces the gas pressure to a set value and maintains it within prescribed limits 3.4.2 insulating joint fitting installed to insulate electrically one section of pipework from another 3.4.3 sleeve protective pipe through which a gas pipe passes SIST EN 15001-2:2009

EN 15001-2:2008 (E) 7 3.4.4 vent pipe pipework connected to a safety or control device to release gas at a safe location 3.4.5 creep relief valve device designed to release a limited flow of gas in the event of an unacceptable pressure being detected within the system it protects 3.4.6 instrumentation pipework pipework required for the proper functioning of the ancillaries installed within the pressure regulating installation EXAMPLES Sensing, measuring, auxiliary and sampling lines 3.5 Definitions relating to tests 3.5.1 strength test specific procedure intended to verify that the pipework meets the requirements for mechanical strength 3.5.2 tightness test specific procedure intended to verify that the pipework meets the requirements for tightness 3.5.3 leak detection fluid specially formulated fluid and foaming product that gives a clear indication that a leak exists when applied to an element of pipework 3.6 Definitions relating to commissioning, operation and maintenance 3.6.1 admission of gas operation of replacing the air or inert gas contained in pipework with distributed gas 3.6.2 purging from gas operation of replacing the distributed gas in pipework with air or inert gas 3.6.3 purging process for safety removing air or inert gas from pipework and/or pipeline components and replacing it with gas, or the reverse process. A distinction is made between the following methods:  direct purging: the displacement of air by gas or vice versa;  indirect purging: the displacement of air by inert gas followed by the displacement by gas or vice versa: alternatively by means of a barrier (a slug of inert gas or a pig) between the air and the gas or vice versa 3.6.4 commissioning activities required to fill and to pressurise pipework, stations, equipment and assemblies with gas and to put them into operation SIST EN 15001-2:2009

EN 15001-2:2008 (E) 8 3.6.5 decommissioning activities required to take out of service any pipework, stations, equipment and assemblies filled with gas and to disconnect them from the rest of the system 3.6.6 competent person person who is trained, experienced and approved to perform activities relating to gas pipework NOTE Means of approval are determined within each country 3.6.7 hot tapping procedure involving the safe use of heat, e.g. welding or fusion, to affix an attachment to a section of pipework containing gas at pressure 3.6.8 hot work work that can provide an ignition source. 3.7 Definitions relating to pressure regulating and metering 3.7.1 gas pressure regulating and metering system system comprising all equipment, together with inlet and outlet piping up to and including the isolating valves, which together performs the functions of pressure regulation, pressure safety and/or quantitative gas measurement, whether or not including pressure boosting and/or gas mixing facilities 4 General 4.1 Technical file prEN 15001-1 requires that sufficient written information concerning the system design, construction, examination, operation and maintenance is recorded in a technical file/operating manual. Any changes to the system that affect the information contained in the technical file shall be recorded in the technical file. The technical file can contain the following information, which shall be updated at the completion of commissioning to record any changes made: a) Diagram of the installation pipework and pressure regulation installations; b) Details of design standards used, evidence of testing of materials and components together with any Certificates issued by test bodies/manufacturers; c) Design pressures and temperatures, maximum and minimum; d) Flow rates and discharge capacities; e) Function and duty of protective controls; f) Corrosion allowances; g) Material wall thickness of pipes; h) Materials of construction; i) Welding standards and test procedures; SIST EN 15001-2:2009

EN 15001-2:2008 (E) 9 j) Commissioning procedure; k) Testing and re-testing procedures; l) Purging procedures or methodology; m) Setting of pressure regulators and safety devices; n) Operating manual including decommissioning and maintenance procedures including in-service inspections; o) Changes made during the commissioning procedure. 4.2 Changes affecting an existing installation Alterations or modifications to the installation including electrical equipment that changes its original characteristics, purpose and/or type, shall be carried out in accordance with prEN 15001-1. 4.3 Quality system The life of a gas installation can be divided into three phases:  Design (see prEN 15001-1);  Construction and testing (see prEN 15001-1);  Operation and maintenance. A quality system shall be applied to the operation and maintenance activities in accordance with this European Standard. Reference may be made to EN ISO 9000 or to equivalent quality systems. After the gas installation has been commissioned, a precisely defined programme of operation, maintenance and condition monitoring should maintain the integrity of the pipework. 4.4 Protection against hazards 4.4.1 Electrical installation in hazardous area When an area has been classified as hazardous (see EN 60079-10) subsequent electrical installations shall comply with the EN 60079-14. NOTE See Directive 1999/92/EC of the European Parliament and of the council of 16. December 1999 on minimum requirements for improving the safety and health protection of workers potentially at risk from explosive atmospheres (15th) individual Directive within the meaning of Article 16(1) of Directive 89/391/EEC). All mechanical and electrical equipment will need to conform with 94/9/EC ATEX when within the scope of this directive. 4.4.2 Gas detection systems Pipework designed and constructed to prEN 15001-1 and maintained to this standard is presumed to be tight. . As such, the fitting of gas detection is not generally necessary. However, where gas detection systems are installed,  they shall not be considered as an alternative to ventilation, SIST EN 15001-2:2009

EN 15001-2:2008 (E) 10  they shall be maintained regularly and  they shall comply with the requirements of EN 60079-29-1. The fitting of gas detection has no effect on the hazardous zone classification (see EN 60079-10). The fitting of gas detection does not imply that an area is classified as a hazardous area. 4.5 Protection against adverse influences Maintenance on gas pressure regulating and metering systems, gas pressure boosters/compressors or gas mixing systems of pipework shall ensure continued protection, where necessary, against adverse influences from any source due to changes in the levels of corrosion, heat and vibration. 5 Commissioning 5.1 General The commissioning shall comprise at least the following items:  verification that the technical file is complete including all test results;  verification that all corrosion protection measures have been applied correctly and any cathodic protection system is operational in accordance with the manufacturers instructions;  verification that strength test has been completed;  verification that tightness test has been completed, when verification is not available the test shall be performed in accordance with prEN 15001-1;  purging to gas;  checking the function of regulators, safety devices and valves. Where purging does not immediately follow the strength and tightness test as required in prEN 15001-1, then prior to purging, an additional tightness test shall be performed. Coatings on buried pipework shall be inspected and tested prior to backfilling of the trench, see prEN 15001-1. The results of the inspections and associated operations shall be recorded in the technical file. 5.2 Purging The purge process can use inert gas as an intermediate stage before the admission of gas (indirect purging), or can be directly from air to gas (direct purging). It is important to ensure that the purge flow rate is not less than the ideal purge velocity, and additionally it should not be excessively greater than the ideal purge velocity as given in Table 1. Excessive venting of fuel gas shall be minimised. Table 1 — Ideal purge velocity for direct purging

DN Up to 50 80 100 150 200 250 300 450 600 900 1 200 Actual Velocity m/s 0,6 0,6 0,6 0,6 0,7 0,8 0,9 1,0 1,2 1,5 1,7 SIST EN 15001-2:2009

EN 15001-2:2008 (E) 11 Corresponding Flow Ratem3/min ≤ 0,08 0,19 0,33 0,7 1,4 2,4 3,9 9,6 20,4 60,0 120,0

Purge gases shall be ventilated to a safe location remote from building openings that can lead to a hazard within the building. A minimum distance of 5 m away from openings should be applied. The purge vent stack should be at least 2,5 m above ground level and should vent vertically upwards to achieve good dispersion. It is not necessary to incorporate a flame trap at the end of the purge stack unless the gas contains more than 5 % hydrogen. In the case of venting heavier than air gases such as LPG or LPG/air mixtures, precautions shall be taken to prevent ignition of any gases dropping to ground level. NOTE 1 Typically by the use of taller stacks or the use of flare burners, flaring of larger volumes is recommended when decommissioning. Vent stacks should always be smaller than the main pipe being purged in order to ensure a high exit velocity. The purge process is complete when a safe and acceptable gas concentration is measured at the vent sample point, the measuring instrument shall be suitable for the commissioning gases. NOTE 2

The purge end point at the vent is typically at least 90% of the flammable content of the gas. On completion of the purge, all open ends of the system shall be sealed, e.g. by blind flanges or caps. All connected appliances shall be commissioned as soon as practicable. Where the commissioning does not follow immediately, all connected appliances shall be locked/sealed off by some appropriate means to prevent their operation and marked accordingly. After purging, a check with leak detection fluid or other means shall be made on all joints used during commissioning or any duct through which the pipework runs to ensure that there is no indication of gas leakage. 5.2.1 Setting and checking regulators and safety devices All regulators, safety devices, control valves, etc., within the pipework, shall be checked to ensure that they function correctly and safely under all flow and fault conditions. Consideration should be given to sealing essential safety devices to prevent unauthorized interference that might lead to danger. 5.2.2 Inspection of gas pressure boosters/compressors During commissioning and operation, start-up and shutdown of any booster/compressor, it shall be verified that it functions correctly and that there is no adverse effect on the operation of downstream appliances and regulator installations or on upstream regulator/meter installations. 6 Operation and maintenance 6.1 Requirements involving operation and maintenance 6.1.1 Identification of buried services Before commencing excavation work the location of all buried services shall be identified through the use of maps or other means. Small trial excavations by hand digging can be carried out to confirm the location. When pipes are exposed it is essential that the gas pipework is correctly identified. When commencing excavation work in the vicinity of buried pipework, the absence of marker tape shall not be taken as an indication that no gas pipework is present. SIST EN 15001-2:2009

EN 15001-2:2008 (E) 12 When excavating within 300 mm of buried pipework, only hand digging is permitted. 6.1.2 Depth of cover Where site works affect the depth of cover refer to prEN 15001-1. 6.1.3 External hazards 6.1.3.1 Mechanical loads Work in the vicinity of existing pipework shall not expose it to mechanical loads, impacts, vibrations, etc. which could affect its safety. 6.1.3.2 Electric currents 6.1.3.2.1 Protective conductor Earthing or bonding connections shall be maintained and shall not subsequently be removed. 6.1.3.2.2 Stray current Where new equipment is installed in the vicinity of existing pipework that can induce stray currents, adequate precautions shall be taken. NOTE For gas pipework guidance is given in EN 12007 series and EN 1594. 6.1.4 Supporting structures Pipes shall not be used as an active part of supporting structures or as reinforcement for such structures. 6.2 Operation 6.2.1 General A person shall be appointed by the user (normally referred to as a “responsible person”) to ensure the pipework is operated and maintained according to the design conditions and the technical file. This person shall also ensure that any work close to the pipework does not give rise to excessive risks. EXAMPLE Reducing safe proximity distances or risk of ingress of gas into buildings Modifications to the pipework shall not be permitted unless they are in accordance with prEN 15001-1. All modifications shall be included in the technical file. Prior to commencement of work, procedures shall be produced to ensure that the section of pipework is correctly and safely isolated, so that decommissioning to a safe state can take place. Any replacement component shall be at least to the same safety level as the original component. At least every five years, the responsible person shall institute a review of:  operation of the pipework,  installed safety components and  design requirements in the technical file SIST EN 15001-2:2009

EN 15001-2:2008 (E) 13 Following the review, the technical file shall be updated, as necessary. 6.2.2 Properties of fuel gas If changing the fuel gas to one that has a significantly different level of toxicity, odorisation, corrosivity or moisture content, the installation shall be re-evaluated to take this into account

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