Gas supply - Gas pipework for buildings - Maximum operating pressure less than or equal to 5 bar - Functional recommendations

1.1   This standard specifies general recommendations for the design, construction, testing, commissioning, operation and maintenance of installation pipework; pipework between the delivery point of the gas and the inlet connection to the gas appliance.
This standard specifies common basic principles for gas installation pipework.
Users of this European standard need to be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.
This standard 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, national legislation/regulation takes precedence as illustrated in CEN /TR 13737.
NOTE 1   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.
This standard applies to:
?   gas installations in residential, commercial and public access building having a maximum operating pressure (MOP) less than or equal to 5 bar;
?   industrial gas installations having a maximum operating pressure (MOP) less than or equal to 0,5 bar.
NOTE 2   For industrial gas installations having a MOP above 0,5 bar, or installations having a MOP above 5 bar, see prEN 15001-1.
This standard is applicable to new installation pipework as well as to replacements of, or extensions to, existing installation pipework.
This standard does not contain detailed recommendations relating to the laying of buried pipework.
NOTE 3     For more information on buried pipework, see EN 12007-1, EN 12007-2 and EN 12007-3.
NOTE 4     For more information on gas pressure regulating installations, see EN 12279.
(continued)

Gasversorgung - Gasleitungsanlagen für Gebäude - Maximal zulässiger Betriebsdruck kleiner oder gleich 5 bar - Funktionale Empfehlungen

1.1   Diese Norm legt die allgemeinen Empfehlungen für Planung, Errichtung, Prüfung, Inbetriebnahme, Betrieb und Instandhaltung von Installationsleitungen fest; dies sind die Leitungsanlagen zwischen der Gasübergabestelle und der Gasgeräteeingangsverbindung.
Diese Norm legtdie allgemeinen Grundsätze für Gasinstallationsleitungen fest. Die Anwender dieser Europäischen Norm sollten sich bewusst sein, dass detailliertere nationale Normen und/oder Technische Regeln in den CEN-Mitgliedsstaaten existieren können.
Diese Norm soll in Verbindung mit diesen nationalen Normen und/oder Technische Regeln, die die oben genannten Grundsätze darlegen, angewendet werden.
Beim Auftreten von Widersprüchen aufgrund restriktiverer Anforderungen in nationalen Gesetzen/Regelungen als in dieser Norm gefordert, haben nationale Gesetze/Regelungen Vorrang wie im CEN Bericht
CR 13737:2001 erläutert.
ANMERKUNG      Der CEN Bericht CR 13737:2001 enthält:
         - eine Klärung aller zutreffenden Gesetzte/Regelungen, die in einem Land anwendbar sind;
         - falls zutreffend, restriktivere nationale Anforderungen;
         - eine nationale Kontaktstelle für neueste Informationen.
Diese Norm gilt für
-   häusliche, gewerbliche Gasinstallationen (nicht-industrielle Gasinstallationen) mit einem maximalen Betriebsdruck (MOP) kleiner oder gleich 5 bar.
-   industrielle Gasinstallationen mit einem maximalen Betriebsdruck (MOP) kleiner oder gleich 0,5 bar.
ANMERKUNG   Für industrielle Standorte mit einem MOP über 0,5 bar oder Gasinstallationen mit einem MOP über
5 bar siehe prEN 15001-1.
Diese Norm gilt sowohl für neu installierte Leitungsanlagen als auch für den Austausch oder die Erweiterung bestehender Leitungsanlagen.
Diese Norm beinhaltet keine Empfehlungen für das Verlegen von erdverlegten Leitungsanlagen. Für weitere Informationen hierzu wird auf EN 12007-1, EN 12007-2 und EN 12007-3 verwiesen.
Für weitere Informationen über Gasdruckregeleinrichtungen wird auf EN 12279 verwiesen.
Für weitere Informatio

Alimentation en gaz - Tuyauteries de gaz pour les bâtiments - Pression maximale de service inférieure ou égale a 5 bar - Recommandations fonctionnelles

Oskrba s plinom - Plinovod za stavbe - Najvišji delovni tlak do vključno 5 bar - Funkcionalna priporočila

General Information

Status
Published
Publication Date
02-Dec-2007
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Oct-2007
Due Date
03-Jan-2008
Completion Date
03-Dec-2007

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gas supply - Gas pipework for buildings - Maximum operating pressure less than or equal to 5 bar - Functional recommendationsAlimentation en gaz - Tuyauteries de gaz pour les bâtiments - Pression maximale de service inférieure ou égale a 5 bar - Recommandations fonctionnellesGasversorgung - Gasleitungsanlagen für Gebäude - Maximal zulässiger Betriebsdruck kleiner oder gleich 5 bar - Funktionale EmpfehlungenTa slovenski standard je istoveten z:EN 1775:2007SIST EN 1775:2008en,de91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:SIST EN 1775:1998/A2:2000SIST EN 1775:1998/A1:2003SIST EN 1775:19981DGRPHãþDSLOVENSKI

STANDARDSIST EN 1775:200801-januar-2008

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1775August 2007ICS 91.140.40Supersedes EN 1775:1998

English VersionGas supply - Gas pipework for buildings - Maximum operatingpressure less than or equal to 5 bar - FunctionalrecommendationsAlimentation en gaz - Tuyauteries de gaz pour lesbâtiments - Pression maximale de service inférieure ouégale à 5 bar - Recommandations fonctionnellesGasversorgung - Gasleitungsanlagen für Gebäude -Maximal zulässiger Betriebsdruck kleiner oder gleich 5 bar -Funktionale EmpfehlungenThis European Standard was approved by CEN on 30 June 2007.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© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1775:2007: E

EN 1775:2007 (E) 2 Contents Foreword..............................................................................................................................................................4 1 Scope......................................................................................................................................................6 2 Normative references............................................................................................................................7 3 Terms and definitions...........................................................................................................................7 3.1 Definitions relating to pressures..........................................................................................................7 3.2 Definitions relating to the gas installation..........................................................................................8 3.3 Definitions relating to means of isolation...........................................................................................9 3.4 Definitions relating to jointing methods..............................................................................................9 3.5 Definitions relating to fittings.............................................................................................................10 3.6 Definitions relating to tests................................................................................................................11 3.7 Definitions relating to commissioning, operation and maintenance.............................................11 3.8 Definitions relating to assembling processes..................................................................................12 3.8.1 Definitions for welding........................................................................................................................12 3.8.2 Definitions for soldering and brazing................................................................................................12 4 Design...................................................................................................................................................12 4.1 General..................................................................................................................................................12 4.2 Selection of components....................................................................................................................13 4.3 Location................................................................................................................................................13 4.4 Protection in case of fire.....................................................................................................................14 4.5 Sizing....................................................................................................................................................14 4.6 Safety devices......................................................................................................................................15 5 Construction.........................................................................................................................................16 5.1 Installation............................................................................................................................................16 5.2 Pipework jointing methods.................................................................................................................16 5.2.1 Threaded joints....................................................................................................................................16 5.2.2 Welded, brazed, soldered and fusion joints.....................................................................................17 5.2.3 Mechanical joints.................................................................................................................................17 5.2.4 Pressed joints......................................................................................................................................17 5.2.5 Stainless steel pliable corrugated tubing system jointing..............................................................18 5.3 Entries through walls and floors........................................................................................................18 5.4 Corrosion..............................................................................................................................................18 5.5 Means of isolation................................................................................................................................18 5.6 Regulators and meters........................................................................................................................19 5.7 Flexible appliance connectors...........................................................................................................19 6 Testing..................................................................................................................................................20 6.1 General recommendations.................................................................................................................20 6.2 Recommendations relating to the safety of persons and property during testing......................20 6.3 Test fluids.............................................................................................................................................20 6.3.1 Fluids used...........................................................................................................................................20 6.3.2 Use of inert gas....................................................................................................................................21 6.3.3 Utilisation of the gas to be distributed..............................................................................................21 6.4 Test conditions....................................................................................................................................21 6.5 Strength testing...................................................................................................................................21 6.6 Tightness testing.................................................................................................................................21 6.7 Additional tests....................................................................................................................................22 7 Commissioning....................................................................................................................................22 7.1 General..................................................................................................................................................22 7.2 Admission of gas.................................................................................................................................23 8 Operation and maintenance...............................................................................................................23 8.1 General..................................................................................................................................................23 8.2 Maintenance.........................................................................................................................................24 8.3 Abnormal situations............................................................................................................................24

EN 1775:2007 (E) 3 8.4 Leak detection......................................................................................................................................25 8.5 Work on operating pipework..............................................................................................................25 8.6 Purging from gas.................................................................................................................................25 Annex A (informative)

Resistance to high temperatures............................................................................27 A.1 General..................................................................................................................................................27 A.2 Procedure A.........................................................................................................................................27 A.2.1 Test criteria..........................................................................................................................................27 A.2.2 Test method.........................................................................................................................................27 A.3 Procedure B.........................................................................................................................................28 A.3.1 Test criteria..........................................................................................................................................28 A.3.2 Test method.........................................................................................................................................29 Annex B (informative)

General guidelines for the construction of joints..................................................30 B.1 General..................................................................................................................................................30 B.2 Installation operatives.........................................................................................................................30 B.3 Quality Control.....................................................................................................................................31 B.4 Documentation.....................................................................................................................................31 Annex C (informative)

Guidelines for the construction of welded, brazed, soldered joints, and polyethylene fusion joints..................................................................................................................32 C.1 Welding of steel...................................................................................................................................32 C.1.1 Materials...............................................................................................................................................32 C.1.2 Approval of the welding procedure...................................................................................................32 C.1.3 Pipework with a maximum operating pressure (MOP) up to and including 0,1 bar and a wall thickness less than 4mm....................................................................................................................32 C.1.4 Pipework with a maximum operating pressure (MOP) over 0,1 bar or wall thickness including and above 4 mm...................................................................................................................................33 C.2 Brazing and soldering of copper and copper alloys........................................................................34 C.2.1 Materials...............................................................................................................................................34 C.2.2 Brazing and soldering procedure......................................................................................................34 C.2.3 Pipework with a maximum operating pressure (MOP) up to and including 0,1 bar.....................34 C.2.4 Pipework with a maximum operating pressure (MOP) over 0,1 bar...............................................35 C.3 Fusion jointing of polyethylene.........................................................................................................35 C.3.1 Materials...............................................................................................................................................35 C.3.2 Polyethylene fusion jointing procedure............................................................................................36 C.3.3 Qualification of personnel..................................................................................................................36 C.3.4 Quality control.....................................................................................................................................36 Annex D (informative)

Guidelines for the construction of pressed joints.................................................39 D.1 Jointing procedure with press fittings on copper pipes.................................................................39 D.1.1 General..................................................................................................................................................39 D.1.2 Installation

process............................................................................................................................39 D.2 Jointing procedure with press fittings on multi-layer and PEX......................................................40 D.2.1 General..................................................................................................................................................40 D.2.2 Installation

process............................................................................................................................40 Annex E (informative)

Guidelines for the construction of stainless steel pliable corrugated tubing systems................................................................................................................................................41 E.1 General..................................................................................................................................................41 E.2 Components of the system................................................................................................................41 E.3 Stainless steel pliable corrugated tubing systems jointing procedure.........................................41 E.3.1 General..................................................................................................................................................41 E.3.2 Training of personnel..........................................................................................................................41 E.3.3 Quality control.....................................................................................................................................42 Bibliography......................................................................................................................................................43

EN 1775:2007 (E) 4 Foreword This document (EN 1775:2007) 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 February 2008, and conflicting national standards shall be withdrawn at the latest by February 2008. This document supersedes EN 1775:1998. The CEN/TC 234 functional standards specify the common appropriate principles and the recognised practices concerning design, construction, operation and maintenance, all for the safety and integrity of gas supply systems, taking the form of general recommendations and/or requirements. 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 United Kingdom.

EN 1775:2007 (E) 5 Introduction This functional standard is to be used as a reference standard in codes of practice in CEN member countries. These codes of practice also need to take account of regulations made by the municipal, regional or national authorities in each country to design and construct gas installations for buildings. At the time this standard was prepared, new pipe materials and jointing techniques were being developed or are already authorized for use in some member countries. Any requirements additional to the requirements of this standard put in place in member countries shall be identified in CEN/TR 13737. It is important to ensure that designers and installation operatives are trained in the correct methods of application for each system as prepared by its supplier/manufacturer.

This standard contains general recommendations for the safety of persons, animals and property and the protection of their environment. The recommendations in this standard are intended to be applied by competent persons who have suitable knowledge and experience. This standard does not consider contractual agreements, qualifications or authorizations imposed by gas distribution system operators, LPG suppliers or public authorities upon companies who design, construct or work on gas installations.

EN 1775:2007 (E) 6

1 Scope 1.1 This standard specifies general recommendations for the design, construction, testing, commissioning, operation and maintenance of installation pipework; pipework between the delivery point of the gas and the inlet connection to the gas appliance. This standard specifies common basic principles for gas installation pipework.

Users of this European standard need to be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries. This standard 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, national legislation/regulation takes precedence as illustrated in CEN /TR 13737. NOTE 1 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. This standard applies to:

 gas installations in residential, commercial and public access building having a maximum operating pressure (MOP) less than or equal to 5 bar;  industrial gas installations having a maximum operating pressure (MOP) less than or equal to 0,5 bar.

NOTE 2 For industrial gas installations having a MOP above 0,5 bar, or installations having a MOP above 5 bar, see prEN 15001-1. This standard is applicable to new installation pipework as well as to replacements of, or extensions to, existing installation pipework. This standard does not contain detailed recommendations relating to the laying of buried pipework.

NOTE 3

For more information on buried pipework, see EN 12007-1, EN 12007-2 and EN 12007-3. NOTE 4

For more information on gas pressure regulating installations, see EN 12279. NOTE 5

For more information on gas metering systems, see EN 1776. 1.2 This standard is applicable to installation pipework supplied from gas distribution systems and from liquefied petroleum gases (LPG) storage vessels.

Excluded are:  single appliance LPG installations without fixed pipework, achieved by a flexible appliance connector from an adjacent LPG storage cylinder.  LPG storage vessels. 1.3 In this standard the term 'gas' refers to combustible gases, which are gaseous at 15 °C and 1 013,25 mbar. These gases, odorized for safety reasons, are commonly referred to as manufactured gas, natural gas or liquefied petroleum gases (LPG). They are also referred to as first, second or third family gases (see EN 437). In this standard, all pressures are gauge pressures, unless otherwise stated.

EN 1775:2007 (E) 7 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 331, Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings EN 437, Test gases — Test pressures — Appliance categories EN 751-1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water — Part 1: Anaerobic jointing compounds EN 751-2, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water —- Part 2: Non-hardening jointing compounds EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water — Part 3: Unsintered PFTE tapes EN 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and heating applications EN 1254-4, Copper and copper alloys — Plumbing fittings — Part 4: Fittings combining other end connections with capillary or compression ends EN 1762, Rubber hoses and hose assemblies for liquefied petroleum gas LPG (liquid or gaseous phase) and natural gas up to 25 bar (2,5 Mpa) — Specification prEN 1763, Flexible rubber and plastics hoses, tubing, coupling tails and assemblies for use with propane and butane in the vapour phase — Requirements EN 10226-1, Pipe threads where pressure tight joints are made on the threads — Part 1: Taper external threads and parallel internal threads — Dimensions, tolerances and designation EN 10226-2, Pipe threads where pressure tight joints are made on the threads — Part 2: Taper external threads and taper internal threads — Dimensions, tolerances and designation EN 10242, Threaded pipe fitting in malleable cast iron EN 14291, Foam producing solutions for leak detection on gas installations EN 14800, Corrugated safety metal hose assemblies for the connection of domestic appliances using gaseous fuels 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Definitions relating to pressures 3.1.1 design pressure pressure on which design calculations are based 3.1.2 operating pressure (OP) pressure which occurs within the pipework under normal operating conditions

EN 1775:2007 (E) 8 3.1.3 maximum operating pressure (MOP) maximum pressure at that pipework can be operated under normal operating conditions 3.1.4 maximum incidental pressure (MIP) maximum pressure that pipework can experience during a short time, limited by the safety devices 3.1.5 tightness test pressure (TTP) pressure applied to pipework during tightness testing 3.1.6 strength test pressure (STP) pressure applied to pipework during strength testing 3.2 Definitions relating to the gas installation 3.2.1 pipework assembly of pipes and fittings NOTE Fittings include, for example, means of isolation, valves, regulators, meters. 3.2.2 point of delivery point of a gas network where the gas is transferred to the user NOTE 1 This can be at a means of isolation (e.g. at the outlet of a LPG storage vessel) or at a meter connection. NOTE 2 For this standard, the point of delivery is typically nominated by the distribution system operator and may be defined in National Regulations or Codes of Practice. 3.2.3 installation pipework pipework downstream of the point of delivery, terminating at the appliance inlet connection NOTE This pipework is normally the property of the customer. 3.2.4 pliable corrugated tubing corrugated tubing capable of being easily bent by hand a limited number of times, which can be covered with a tubular outer sheath by the manufacturer at the time of production 3.2.5 service line pipework from the main to the delivery point of the gas into the installation pipework 3.2.6 riser section of vertical installation pipework that is taller than one floor of a building

3.2.7 lateral section of generally horizontal installation pipework 3.2.8 ventilated space space where the air is continuously changed by natural or mechanical means 3.2.9 duct space specifically designed and constructed for the passage of building services

EN 1775:2007 (E) 9 EXAMPLE Building services include gas pipework, water systems, power and telecommunication cables. 3.2.10 equipotential bond means of ensuring that metallic gas pipework and other metallic parts of the building are at the same electrical potential NOTE For safety reasons, this equipotential bonding is connected to the ground. 3.2.11 residential building building which contains one or more dwelling areas but excludes areas principally intended for professional activities and locations accessible to the public 3.2.12 public access building building principally containing areas where the public can be admitted. EXAMPLE Such a building can be a school, hospital, movie theatre, railway station or a shop. NOTE The public may not be given access to all parts of the building (e.g. operating theatres of a hospital, etc.). 3.2.13 commercial building building containing, with the exception of industrial production plants, only areas reserved for professional activities

EXAMPLE Such a building can be an office block or a repair workshop. 3.2.14 high rise building building in which the height from the floor of the highest occupied level to ground level is:  for a residential building greater than 50 m;  other buildings greater than 30 m NOTE The design considerations relate to the use of the building and the vertical height of the sections of pipework. 3.3 Definitions relating to means of isolation 3.3.1 means of isolation device intended to interrupt the gas flow in pipework EXAMPLE This device can be a manually operable valve. 3.3.2 appliance means of isolation means of isolation intended to isolate an appliance 3.4 Definitions relating to jointing methods 3.4.1 joint means of connecting elements of a gas installation 3.4.2 threaded joint joint in which gas tightness is achieved by metal to metal contact within threads with the assistance of a sealant

EN 1775:2007 (E) 10 3.4.3 mechanical joint joint in which gas tightness is achieved by compression with or without a seal and which can be disassembled and reassembled. NOTE

A compression joint is a mechanical joint which is not normally intended to be disassembled and reassembled. 3.4.4 Definitions for pressed joints 3.4.4.1 pressed joint joint in which tightness is achieved by using an appropriate tool for either compressing a fitting to form the joint or expanding a pipe to enable forming the joint

NOTE Such a joint cannot be disassembled and reused. 3.4.4.2 pressed joint for copper pipe pressed joint whose jointing is carried out by a radial deformation of the end of a fitting body onto a tube and whose sealing is carried out by an elastomeric o-ring. NOTE 1 Some designs can incorporate an additi

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