SIST EN 253:2009
(Main)District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
This European Standard specifies requirements and test methods for straight lengths of prefabricated thermally insulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel service pipe from DN 20 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene. The pipe assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers. This standard applies only to insulated pipe assemblies, for continuous operation with hot water at various
temperatures up to 120 °C and occasionally with a peak temperature up to 140 °C. The estimation of expected thermal life with continuous operation at various temperatures is outlined in annex B.
Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt erdverlegte Fernwärmenetze - Verbund-Rohrsystem bestehend aus Stahl-Mediumrohr, Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen
Diese Europäische Norm legt Anforderungen und Prüfverfahren für vorgefertigte, gerade wärmegedämmte
Rohr-in-Rohr-Systeme für direkt erdverlegte Fernwärmenetze fest, die aus einem Stahl-Mediumrohr von
DN 15 bis DN 1200 mit Wärmedämmung aus Polyurethan-Hartschaumstoff und einer Ummantelung aus
Polyethylen bestehen. Das Verbund-Rohrsystem darf darüber hinaus folgende Bauteile umfassen: Messdrähte,
Abstandshalter und Diffusionsbarrieren.
Diese Norm gilt nur für wärmegedämmte Verbund-Rohrsysteme für den Dauerbetrieb mit Warmwasser bei
unterschiedlichen Betriebstemperaturen von bis zu 120 °C und gelegentlich auftretenden Spitzentemperaturen
von bis zu 140 °C.
Die Abschätzung der erwarteten thermischen Lebensdauer bei Dauerbetrieb mit unterschiedlichen Betriebstemperaturen
ist in Anhang B erläutert.
Tuyaux de chauffage urbain - Systèmes bloqués de tuyaux préisolés pour les réseaux d'eau chaude enterrés directement - Tube de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthylène
La présente Norme européenne définit les prescriptions et les méthodes d’essai applicables aux longueurs
droites de systèmes préfabriqués de tuyaux isolés thermiquement pour réseaux d’eau chaude enterrés
directement comprenant un tube de service en acier de DN 15 à DN 1200, une isolation en mousse rigide de
polyuréthane et un tube de protection en polyéthylène. Le tuyau préisolé peut également comprendre les
éléments supplémentaires suivants : les câbles de mesure, les entretoises et les barrières anti diffusion.
La présente Norme s’applique uniquement aux systèmes isolés par mousse de polyuréthane utilisés pour
l’eau chaude à différentes températures pouvant aller en service continu jusqu'à 120 °C et, parfois, à une
température de pointe pouvant atteindre 140 °C.
L’estimation de la durée de vie thermique escomptée de systèmes opérant à différentes températures en
service continu est donnée à l’Annexe B.
Cevi za daljinsko ogrevanje - Izolirani vezani cevni sistemi za podzemeljska toplovodna omrežja - Cevni sestav iz jeklene cevi, poliuretanske toplotne izolacije in zunanjega polietilenskega plašča
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.RG]HPHOMVNDFernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt erdverlegte Fernwärmenetze - Verbund-Rohrsystem bestehend aus Stahl-Mediumrohr, Polyurethan-Wärmedämmung und Außenmantel aus PolyethylenTuyaux de chauffage urbain - Systèmes bloqués de tuyaux préisolés pour les réseaux d'eau chaude enterrés directement - Tube de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthylèneDistrict heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene91.140.65Oprema za ogrevanje vodeWater heating equipment23.040.10Železne in jeklene ceviIron and steel pipesICS:Ta slovenski standard je istoveten z:EN 253:2009SIST EN 253:2009en,fr01-april-2009SIST EN 253:2009SLOVENSKI
STANDARDSIST EN 253:2004/A2:2007SIST EN 253:2004/A1:2006SIST EN 253:20041DGRPHãþD
SIST EN 253:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 253January 2009ICS 23.040.10Supersedes EN 253:2003
English VersionDistrict heating pipes - Preinsulated bonded pipe systems fordirectly buried hot water networks - Pipe assembly of steelservice pipe, polyurethane thermal insulation and outer casing ofpolyethyleneTuyaux de chauffage urbain - Systèmes bloqués de tuyauxpréisolés pour les réseaux d'eau chaude enterrésdirectement - Tube de service en acier, isolation thermiqueen polyuréthane et tube de protection en polyéthylèneFernwärmerohre - Werkmäßig gedämmteVerbundmantelrohrsysteme für direkt erdverlegteFernwärmenetze - Verbund-Rohrsystem bestehend ausStahl-Mediumrohr, Polyurethan-Wärmedämmung undAußenmantel aus PolyethylenThis European Standard was approved by CEN on 5 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 253:2009: ESIST EN 253:2009
EN 253:2009 (E) 2 Contents page Foreword . 4Introduction . 51Scope . 62Normative references . 63Terms and definitions . 74Requirements . 94.1General . 94.2Steel service pipe. 94.2.1Specification . 94.2.2Diameter . 104.2.3Wall thickness . 104.2.4Surface condition. 124.3Casing . 124.3.1Material properties . 124.3.2Casing properties . 134.4Polyurethane rigid foam insulation (PUR) . 154.4.1Composition . 154.4.2Voids and bubbles . 154.4.3Compressive strength . 154.5Pipe assembly . 154.5.1General . 154.5.2Pipe ends . 154.5.3Diameter and wall thickness of the casing . 154.5.4Centre line deviation . 164.5.5Expected thermal life and long term temperature resistance . 174.5.6Thermal conductivity in unaged condition . 174.5.7Thermal conductivity at artificially aged condition . 174.5.8Impact resistance. 174.5.9Long term creep resistance and modulus . 174.5.10Surface conditions at delivery . 184.5.11Measuring wires for surveillance systems . 185Test methods . 185.1General conditions and test specimens . 185.1.1General conditions . 185.1.2Test specimens . 185.2Casing . 195.2.1Appearance and surface finish . 195.2.2Elongation at break. 195.2.3Carbon black dispersion, homogeneity . 205.2.4Stress crack resistance test . 205.3Polyurethane rigid foam insulation (PUR) . 215.3.1Composition . 215.3.2Voids and bubbles . 215.3.3Compressive strength . 215.4Pipe assembly . 215.4.1Axial shear strength . 215.4.2Tangential shear strength . 235.4.3Shear strength of the pipe assembly after ageing . 255.4.4Thermal conductivity in unaged condition . 265.4.5Thermal conductivity at artificially aged condition . 265.4.6Impact resistance. 265.4.7Long term creep resistance and modulus at 140 °°°°C . 266Marking . 30SIST EN 253:2009
EN 253:2009 (E) 3 6.1General. 306.2Steel service pipe . 306.3Casing . 306.4Pipe assembly . 30Annex A (informative)
Relation between actual continuous operating conditions and accelerated ageing test conditions . 31Annex B (informative)
Calculation of the minimum expected thermal life with operation at various temperatures with respect to PUR foam performance . 33Annex C (normative)
Calculated continuous operating temperature (CCOT) . 34C.1General. 34C.2Symbols . 34C.3Ageing and shear strength determinations . 34C.4Calculations . 35C.4.1Determination of the thermal life at different ageing temperatures . 35C.4.2Adoption to the Arrhenius relation . 35C.4.3Calculated continuous operating temperature, CCOT . 35Annex D (informative)
Guidelines for inspection and testing . 37D.1General. 37D.2Manufacturer's type test . 37D.3Manufacturer’s quality control . 37D.4External inspection . 37D.5Manufacturer's responsibility . 37Annex E (informative)
Radial creep behaviour of the polyurethane foam (PUR) . 40Annex F (normative)
Thermal conductivity of pre-insulated pipes - Test procedure . 41F.1Scope . 41F.2Requirements (EN ISO 8497:1996, Clause 5) . 41F.2.1Test specimen (EN ISO 8497:1996, 5.1) . 41F.2.2Operating temperature (EN ISO 8497:1996, 5.2) . 41F.2.3Types of apparatus (EN ISO 8497:1996, 5.5) . 41F.3Apparatus (EN ISO 8497:1996, Clause 7) . 41F.3.1Guarded end apparatus . 41F.3.2Calibrated end apparatus. 41F.3.3Dimensions (EN ISO 8497:1996, 7.2) . 42F.3.4Heater pipe surface temperature . 42F.4Test specimens (EN ISO 8497:1996, Clause 8) . 42F.4.1Conditioning (EN ISO 8497:1996, 8.4) . 42F.4.2Dimension measurement (EN ISO 8497:1996, 8.5) . 42F.4.3Surface temperature measurement . 42F.5Procedure (EN ISO 8497:1996, Clause 9) . 42F.5.1Test length (EN ISO 8497:1996, 9.1.1) . 42F.5.2Diameter (EN ISO 8497:1996, 8.5) . 42F.5.3Thickness of casing . 43F.5.4Ambient requirements (EN ISO 8497:1996, 9.2) . 43F.5.5Test pipe temperature (EN ISO 8497:1996, 9.3) . 43F.5.6Power supply (EN ISO 8497:1996, 7.9) . 43F.5.7Axial heat loss (EN ISO 8497:1996, 5.7) . 43F.5.8Test period and stability (EN ISO 8497:1996, 9.5.3) . 43F.6Calculations (EN ISO 8497:1996, Clause 11) . 43F.6.1Thermal conductivity (EN ISO 8497:1996, 3.5) . 43F.7Symbols and units (EN ISO 8497:1996 Clause 4) . 44Annex G (informative)
National A-deviations . 46G.1Swedish national legislative deviations on steel service pipes . 46Annex H (informative)
Main changes from the previous edition of EN 253 . 47Annex I (informative)
Waste treatment and recycling . 49Bibliography . 50SIST EN 253:2009
EN 253:2009 (E) 4 Foreword This document (EN 253:2009) has been prepared by Technical Committee CEN/TC 107 “Prefabricated district heating pipe systems”, the secretariat of which is held by DS. 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 253:2003. Annex H provides details of significant technical changes between this European Standard and the previous editions. 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 253:2009
EN 253:2009 (E) 5 Introduction This specification is part of the standards for bonded systems using polyurethane foam thermal insulation applied to bond to a steel service pipe and a polyethylene casing. The other standards from CEN/TC 107 covering this subject are: EN 448, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; EN 488, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; EN 489, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; EN 13941, Design and installation of preinsulated bonded pipe systems for district heating; EN 14419, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Surveillance systems; EN 15698-1, District heating pipes – Preinsulated bonded twin pipe systems for directly buried hot water networks – Part 1: Twin pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene SIST EN 253:2009
EN 253:2009 (E) 6 1 Scope This European Standard specifies requirements and test methods for straight lengths of prefabricated thermally insulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel service pipe from DN 15 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene. The pipe assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers. This standard applies only to insulated pipe assemblies, for continuous operation with hot water at various temperatures up to 120 °C and occasionally with a peak temperature up to 140 °C. The estimation of expected thermal life with continuous operation at various temperatures is outlined in Annex B. 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 489, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene EN 728, Plastics piping and ducting systems – Polyolefin pipes and fittings – Determination of oxidation induction time EN 10204, Metallic products – Types of inspection documents EN 10216-2, Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties EN 10217-1, Welded steel tubes for pressure purposes – Technical delivery conditions - Part 1: Non-alloy steel tubes with specified room temperature properties EN 10217-2, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties EN 10217-5, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties EN 10220, Seamless and welded steel tubes – Dimensions and masses per unit length EN 13941, Design and installation of preinsulated bonded pipe systems for district heating EN 14419, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Surveillance systems EN ISO 1133:2005, Plastics – Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics (ISO 1133:2005) EN ISO 2505, Thermoplastics pipes – Longitudinal reversion – Test methods and parameters (ISO 2505:2005) EN ISO 3126, Plastics piping systems – Plastics components – Determination of dimensions (ISO 3126:2005) EN ISO 8497:1996, Thermal insulation – Determination of steady-state thermal transmission properties of thermal insulation for circular pipes (ISO 8497:1994) SIST EN 253:2009
EN 253:2009 (E) 7 EN ISO 8501-1:2007, Preparation of steel substrates before application of paints and related products – Visual assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings (ISO 8501-1:2007) EN ISO 9080, Plastics piping and ducting systems – Determination of the long-term hydrostatic strength of thermoplastic materials in pipe form by extrapolation (ISO 9080:2003) EN ISO 9692-1, Welding and allied processes – Recommendations for joint preparation – Part 1: Manual metal-arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-1:2003) EN ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications – Classification and designation – Overall service (design) coefficient (ISO 12162:1995) ISO 844, Rigid cellular plastics – Determination of compression properties ISO 3127:1994, Thermoplastics pipes – Determination of resistance to external blows – Round-the-clock method ISO 6964, Polyolefin pipes and fittings – Determination of carbon black content by calcination and pyrolysis – Test method and basic specification ISO 11414:1996, Plastics pipes and fittings -- Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece assemblies by butt fusion ISO 13953, Polyethylene (PE) pipes and fittings – Determination of the tensile strength and failure mode of test pieces from a butt-fused joint ISO 16770, Plastics – Determination of environmental stress cracking (ESC) of polyethylene – Full notch creep test (FNCT) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1133:2005 and the following apply. 3.1 ageing keeping the service pipe at a certain, elevated temperature for a certain time while the casing is exposed to a temperature of (23 ± 2) °C 3.2 artificial ageing keeping the complete pipe assembly at a certain, elevated temperature for a certain time 3.3 batch specified quantity of raw material made under the same uniform production conditions in one production run by one manufacturer 3.4 bonded system service pipe, insulating material and casing which are bonded by the insulating material 3.5 calculated continuous operating temperature CCOT temperature for which the thermal life of 30 years can be calculated assuming an Arrhenius relationship between temperature and thermal life SIST EN 253:2009
EN 253:2009 (E) 8 3.6 casing outer layer made of polyethylene to protect the insulation and the service pipe from ground water, moisture and mechanical damage 3.7 centre line deviation deviation between the centre line of the service pipe and the centre line of the casing 3.8 continuous temperature temperature at which the hot water network is designed to operate continuously 3.9 creep slow progressive strain under the influence of stresses 3.10 density mass of a body of a material divided by the volume of the body 3.11 diffusion barrier layer in the pipe assembly of another material than PE, installed between the thermal insulation and the PE casing, with the aim to restrict the diffusion of gases through the casing 3.12 foam density apparent density of the foam of the insulating layer at any position 3.13 fusion compatibility ability of two PE materials to be fused together to form a joint which conforms to the performance requirements of this European Standard 3.14 insulation material material which reduces the heat loss 3.15 Polymeric Methylendiphenyl Diisocyanate-Index MDI-index quotient of the actual amount of isocyanate used and the stoichiometrically required amount, multiplied by 100 3.16 peak temperature highest temperature at which a system is designed to operate occasionally, see Annex B 3.17 physical blowing agent additive in the mixture of isocyanate and polyole which evaporate without reacting during the polymerisations 3.18 pipe assembly assembled product, consisting of a service pipe, insulating material and a casing SIST EN 253:2009
EN 253:2009 (E) 9 3.19 polyurethane rigid foam PUR material resulting from the chemical reaction of polyisocyanates with hydroxyl containing compounds in the presence of catalysts having mainly closed cell structure NOTE: The foaming can be assisted by a physical blowing agent 3.20 service pipe steel pipe that contains the water 3.21 shear strength ability of the pipe assembly to withstand a shear force acting between the casing and the service pipe 3.22 thermal life time elapsed before the tangential shear stress at 140 °C falls below 0,13 MPa when exposing the pipe continu-ously to the ageing temperature NOTE The limit value f
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