EN 253:2003
(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.
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
Tuyaux de chauffage urbain - Systèmes bloqués de tuyaux pré-isolés 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 spécifications et les méthodes d'essais applicables aux longueurs droites de systèmes préfabriqués de tubes isolés thermiquement pour réseaux d'eau chaude enterrés directement comprenant un tube de service en acier de DN 20 à DN 1200, une isolation en mousse rigide de polyuréthane et un tube de protection en polyéthylène.
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
Relations
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 - Systemes bloqués de tuyaux pré-isolés pour les réseaux d'eau chaude enterrés directement - Tube de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthyleneDistrict 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 pipes23.040.07Cevovodi za daljinsko ogrevanje in njihovi deliPipeline and its parts for district heatICS:Ta slovenski standard je istoveten z:EN 253:2003SIST EN 253:2004en01-oktober-2004SIST EN 253:2004SLOVENSKI
STANDARDSIST EN 253:20001DGRPHãþD
SIST EN 253:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 253February 2003ICS 23.040.99Supersedes EN 253:2003English 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 tuyauxpré-isolés 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 28 November 2002.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland andUnited Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 253:2003 ESIST EN 253:2004
EN 253:2003 (E)2ContentspageForeword.5Introduction.61Scope.82Normative references.83Terms and definitions.94Requirements.104.1General.104.2Steel service pipe.114.2.1Quality.114.2.2Diameter.114.2.3Wall thickness.114.2.4Surface condition.134.3Casing.134.3.1Material properties.134.3.2Casing properties.144.4Polyurethane rigid foam insulation (PUR).164.4.1Composition.164.4.2Cell structure.174.4.3Foam density.174.4.4Compressive strength.174.4.5Water absorption at elevated temperature.174.5Pipe assembly.174.5.1Pipe ends.174.5.2Increase in diameter of the casing pipe.174.5.3Centre line deviation.174.5.4Expected thermal life and long term temperature resistance.184.5.5Thermal conductivity in unaged condition.184.5.6Impact resistance.184.5.7Creep behaviour.184.5.8Surface conditions at delivery.195Test methods.195.1General.195.1.1Test specimens.195.2Casing.195.2.1Material density.195.2.2Dimensions.195.2.3Appearance and surface finish.205.2.4Heat reversion.205.2.5Long-term mechanical properties.205.2.6Constant load tensile test (CLT).205.2.7Elongation at break.205.2.8Carbon black dispersion, homogeneity.215.2.9Notched constant load test.215.3Polyurethane rigid foam insulation (PUR).225.3.1Composition.225.3.2Cell structure.225.3.3Foam density.225.3.4Compressive strength.235.3.5Water absorption.23SIST EN 253:2004
EN 253:2003 (E)35.4Pipe assembly.235.4.1Increase in diameter of the casing pipe.235.4.2Axial shear strength.235.4.3Tangential shear strength.255.4.4Shear strength of the pipe assembly after ageing.265.4.5Thermal conductivity.265.4.6Impact resistance.275.4.7Creep behaviour at 140 °C.276Marking.306.1General.306.2Steel service pipe.306.3Casing.306.4Pipe assembly.30Annex A (informative)
Relation between actual continuous operating conditions and acceleratedageing test conditions.31Annex B (informative)
Calculation of the minimum expected thermal life with operation at varioustemperatures 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.1Manufacturer's type test.37D.2Manufacturer’s quality surveillance.37D.3External inspection.37D.4Manufacturer's responsibility.37Annex E (informative)
Change of blowing agent and influence on thermochemical andthermomechanical properties of polyurethane rigid foam (PUR).40Annex F (normative)
Radial creep behaviour of the polyurethane foam (PUR).41Annex G (normative)
Thermal conductivity of pre-insulated pipes - Test procedure.43G.1Scope.43G.2Requirements (EN ISO 8497:1994, Clause 5).43G.2.1Test specimen (EN ISO 8497:1994, 5.1).43G.2.2Operating temperature (EN ISO 8497:1994, 5.2).43G.2.3Types of apparatus (EN ISO 8497:1994, 5.5).43G.3Apparatus (EN ISO 8497:1994, Clause 7).43G.3.1Guarded end apparatus.43G.3.2Calibrated end apparatus.44G.3.3Dimensions (EN ISO 8497:1994, 7.2).44G.3.4Heater pipe surface temperature.44G.4Test specimens (EN ISO 8497:1994, Clause 8).44G.4.1Conditioning (EN ISO 8497:1994, 8.4).44G.4.2Dimension measurement (EN ISO 8497:1994, 8.5).44G.4.3Surface temperature measurement.44G.5Procedure (EN ISO 8497:1994, Clause 9).44G.5.1Test length (EN ISO 8497:1994, 9.1.1).44G.5.2Diameter (EN ISO 8497:1994, 8.5).45G.5.3Thickness of casing.45G.5.4Ambient requirements (EN ISO 8497:1994, 9.2).45G.5.5Test pipe temperature (EN ISO 8497:1994, 9.3).45G.5.6Power supply (EN ISO 8497:1994, 7.9).45G.5.7Axial heat loss (EN ISO 8497:1994, 5.7).45SIST EN 253:2004
EN 253:2003 (E)4G.5.8Test period and stability (EN ISO 8497:1994, 9.5.3).45G.6Calculations (EN ISO 8497:1994, Clause 11).45G.6.1Thermal conductivity (EN ISO 8497:1994, 3.5).45G.7Symbols and units (EN ISO 8497:1994 Clause 4).46Annex H
(informative)
National A-deviations.48H.1 Swedish national legislative deviations on steel service pipes.48Bibliography.50SIST EN 253:2004
EN 253:2003 (E)5ForewordThis document (EN 253:2003) has been prepared by Technical Committee CEN/TC 107 "Prefabricated districtheating 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 orby endorsement, at the latest by August 2003, and conflicting national standards shall be withdrawn at the latest byAugust 2003.This document supersedes EN 253:1994.Annexes A, B, D, E and H are informative.Annexes C, F and G are normative.This document includes a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 253:2004
EN 253:2003 (E)6IntroductionThe first edition of EN 253 was approved in 1990. The first edition was replaced by the second edition in 1994.The main areas of the first revision were:¾ the requirements for the PE quality have been updated;¾ any reference to CFC has been deleted and alternative blowing agents have been taken into consideration.For further information see annex E.The main areas of this second revision are:¾ the title has been amended by ”District heating pipes”;¾ the term ”underground” in the title has been changed to ”directly buried”;¾ the mentioning in the foreword of the production method ”injected (poured)” has been deleted;¾ the references to other standards have been changed to be in line with the latest versions of the standards;¾ definitions have been added for terms ”batch”, ”calculated continuous operating temperature (CCOT)”, ”creep”,"foam density”, "lot" and ”thermal life”;¾ the definitions for the terms "overall density", "core density", "density of PE-raw material", "high densitypolyethylene (PE-HD)", "injected (poured) pipe assembly", "melt flow rate, MFR 190/5" have been deleted;¾ the term "casing pipe" has been changed to "casing" to allow the use of PE casing continously extrudeddirectly onto the insulation and the requirements and tests have been amended accordingly;¾ the requirements for the steel quality and dimensions of the steel service pipe have been changed as much aspossible to be in line with European Standards. This includes references to the new European StandardsEN 10216-2, EN 10217-2 and EN 10217-5;¾ requirements on tolerances on the outside diameter, Ds, of the steel service pipe at the pipe ends have beenintroduced;¾ requirements on tolerances on the actual wall thickness, T, of the steel service pipe have been introduced;¾ service pipes with nominal diameters from DN 700 up to and including DN 1200 have been added and therequirements have been amended accordingly;¾ requirements on 3.1.B certificates for the steel service pipe have been included;¾ requirements and test methods for the dispersion of carbon black in the casing material have been introduced;¾ the reference temperature for testing the induction time of the casing has been changed to 210 °C;¾ casings with nominal outside diameters from 900 mm up to and including 1 400 mm have been added and therequirements have been amended accordingly;¾ the requirement on the minimum time to failure of the casing when tested for long-term mechanical propertieshave been extended to 2 000 h;SIST EN 253:2004
EN 253:2003 (E)7¾ the requirements for the cell structure of the PUR foam insulation have been extended and a test method hasbeen introduced;¾ the requirements for ”core density” and ”overall density” have been deleted and substituted by requirementsfor ”foam density” and the method for testing the ”overall density” has been omitted;¾ the ”calculated continuous operating temperature (CCOT)” has been introduced. This includes the addition ofthe normative annex C;¾ the requirements for ”creep resistance” have been substituted by requirements for ”creep behaviour” and a testmethod for creep behaviour at 140 °C has been introduced. This includes the addition of the normativeannex F;¾ requirements on "stress crack resistance" and a "notched constant load test" for the casing have been added;¾ requirements for surface conditions at delivery have been added;¾ requirements on marking of steel service pipes have been added;¾ the former annexes C, D and E have been redesignated D, E and H respectively;¾ a new test procedure for testing of thermal conductivity of preinsulated pipes has been introduced andincluded as annex G. The relevant requirements have been included in 4.5.5 and 5.4.5.This specification is part of the standards for bonded systems using polyurethane foam thermal insulation appliedto bond to a steel service pipe and a polyethylene casing.The other standards from CEN/TC 107 are:EN 448:2003, 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 488:2003, 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 489:2003, 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 13941:2003, Design and installation of preinsulated bonded pipe systems for district heating.NOTEThe following draft in connection with the above mentioned standards is under development:prEN 14419, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Surveillancesystems.SIST EN 253:2004
EN 253:2003 (E)81 ScopeThis European Standard specifies requirements and test methods for straight lengths of prefabricated thermallyinsulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel service pipe from DN 20to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene.This standard applies only to insulated pipe assemblies, for continuous operation with hot water at varioustemperatures 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 referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 728, Plastics piping and ducting systems – Polyolefin pipes and fittings – Determination of oxidation inductiontime.EN 743, Plastics piping and ducting systems – Thermoplastics pipes – Determination of the longitudinal reversion.EN 921, Plastics piping systems – Thermoplastics pipes – Determination of resistance to internal pressure atconstant temperature.EN 10204, Metallic products – Types of inspection documents.EN 10216-2, Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 2: Non-alloy andalloy steel tubes with specified elevated temperature properties.EN 10217-2, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 2: Electric weldednon-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 arcwelded non-alloy and alloy steel tubes with specified elevated temperature properties.EN ISO 1133:1999, Plastics – Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate(MVR) of thermoplastics (ISO 1133:1997).EN ISO 1872-2, Plastics – Polyethylene (PE) moulding and extrusion materials – Part 2: Preparation of testspecimens and determination of properties (ISO 1872-2:1997).EN ISO 8497:1996, Thermal insulation – Determination of steady-state thermal transmission properties of thermalinsulation for circular pipes (ISO 8497:1994).ENV 10220, Seamless and welded steel tubes – Dimensions and masses per unit length.ISO 844, Rigid cellular plastics – Determination of compression properties.ISO 845, Cellular plastics and rubbers – Determination of apparent (bulk) density.ISO 1183:1987, Plastics – Methods for determining the density and relative density of non-cellular plastics.ISO 3126, Plastics pipes – Measurement of dimensions.SIST EN 253:2004
EN 253:2003 (E)9ISO 3127:1994, Thermoplastics pipes – Determination of resistance to external blows – Round-the-clock method.ISO 4590:2002, Rigid cellular plastics – Determination of the volume percentage of open cells and of closed cells.ISO 6761, Steel tubes – Preparation of ends of tubes and fittings for welding.ISO 8501-1:1988, Preparation of steel substrates before application of paints and related products – Visualassessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates andof steel substrates after overall removal of previous coatings.ISO/DIS 16770, Plastics – Determination of environmental stress cracking (ESC) of polyethylene (PE) – Full notchcreep test (FNCT).3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1ageingkeeping the service pipe at a certain, elevated temperature for a certain time while
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.