BS-EN-253-2009.pdf

BS EN 253:2009 ICS 23.040.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD 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 British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2009 © BSI 2009 ISBN 978 0 580 59479 3 Amendments/corrigenda issued since publication DateComments BS EN 253:2009 National foreword This British Standard is the UK implementation of EN 253:2009. It supersedes BS EN 253:2003 + A2:2006 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee RHE/9, Insulated underground pipelines. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 253:2009 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 253 January 2009 ICS 23.040.10Supersedes EN 253:2003 English Version 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 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 Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt erdverlegte Fernwärmenetze - Verbund-Rohrsystem bestehend aus Stahl-Mediumrohr, Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen This 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 European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2009 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 253:2009: E BS EN 253:2009 EN 253:2009 (E) 2 Contents page Foreword 4? Introduction . 5? 1?Scope 6? 2?Normative references 6? 3?Terms and definitions . 7? 4?Requirements . 9? 4.1?General 9? 4.2?Steel service pipe. 9? 4.2.1?Specification . 9? 4.2.2?Diameter 10? 4.2.3?Wall thickness 10? 4.2.4?Surface condition. 12? 4.3?Casing . 12? 4.3.1?Material properties . 12? 4.3.2?Casing properties 13? 4.4?Polyurethane rigid foam insulation (PUR) 15? 4.4.1?Composition . 15? 4.4.2?Voids and bubbles . 15? 4.4.3?Compressive strength . 15? 4.5?Pipe assembly 15? 4.5.1?General 15? 4.5.2?Pipe ends 15? 4.5.3?Diameter and wall thickness of the casing . 15? 4.5.4?Centre line deviation . 16? 4.5.5?Expected thermal life and long term temperature resistance . 17? 4.5.6?Thermal conductivity in unaged condition . 17? 4.5.7?Thermal conductivity at artificially aged condition 17? 4.5.8?Impact resistance. 17? 4.5.9?Long term creep resistance and modulus 17? 4.5.10?Surface conditions at delivery 18? 4.5.11?Measuring wires for surveillance systems . 18? 5?Test methods 18? 5.1?General conditions and test specimens 18? 5.1.1?General conditions 18? 5.1.2?Test specimens 18? 5.2?Casing . 19? 5.2.1?Appearance and surface finish 19? 5.2.2?Elongation at break 19? 5.2.3?Carbon black dispersion, homogeneity 20? 5.2.4?Stress crack resistance test . 20? 5.3?Polyurethane rigid foam insulation (PUR) 21? 5.3.1?Composition . 21? 5.3.2?Voids and bubbles . 21? 5.3.3?Compressive strength . 21? 5.4?Pipe assembly 21? 5.4.1?Axial shear strength 21? 5.4.2?Tangential shear strength . 23? 5.4.3?Shear strength of the pipe assembly after ageing . 25? 5.4.4?Thermal conductivity in unaged condition . 26? 5.4.5?Thermal conductivity at artificially aged condition 26? 5.4.6?Impact resistance. 26? 5.4.7?Long term creep resistance and modulus at 140 ° ° ° °C 26? 6?Marking . 30? BS EN 253:2009 EN 253:2009 (E) 3 6.1?General 30? 6.2?Steel service pipe 30? 6.3?Casing . 30? 6.4?Pipe assembly 30? Annex A (informative) Relation between actual continuous operating conditions and accelerated ageing test conditions . 31? Annex B (informative) Calculation of the minimum expected thermal life with operation at various temperatures with respect to PUR foam performance 33? Annex C (normative) Calculated continuous operating temperature (CCOT) . 34? C.1?General 34? C.2?Symbols 34? C.3?Ageing and shear strength determinations 34? C.4?Calculations . 35? C.4.1?Determination of the thermal life at different ageing temperatures . 35? C.4.2?Adoption to the Arrhenius relation 35? C.4.3?Calculated continuous operating temperature, CCOT 35? Annex D (informative) Guidelines for inspection and testing 37? D.1?General 37? D.2?Manufacturer's type test . 37? D.3?Manufacturers quality control . 37? D.4?External inspection 37? D.5?Manufacturer's responsibility . 37? Annex E (informative) Radial creep behaviour of the polyurethane foam (PUR) . 40? Annex F (normative) Thermal conductivity of pre-insulated pipes - Test procedure . 41? F.1?Scope 41? F.2?Requirements (EN ISO 8497:1996, Clause 5) . 41? F.2.1?Test specimen (EN ISO 8497:1996, 5.1) . 41? F.2.2?Operating temperature (EN ISO 8497:1996, 5.2) . 41? F.2.3?Types of apparatus (EN ISO 8497:1996, 5.5) . 41? F.3?Apparatus (EN ISO 8497:1996, Clause 7) . 41? F.3.1?Guarded end apparatus 41? F.3.2?Calibrated end apparatus 41? F.3.3?Dimensions (EN ISO 8497:1996, 7.2) 42? F.3.4?Heater pipe surface temperature . 42? F.4?Test specimens (EN ISO 8497:1996, Clause 8) 42? F.4.1?Conditioning (EN ISO 8497:1996, 8.4) 42? F.4.2?Dimension measurement (EN ISO 8497:1996, 8.5) . 42? F.4.3?Surface temperature measurement . 42? F.5?Procedure (EN ISO 8497:1996, Clause 9) . 42? F.5.1?Test length (EN ISO 8497:1996, 9.1.1) 42? F.5.2?Diameter (EN ISO 8497:1996, 8.5) . 42? F.5.3?Thickness of casing 43? F.5.4?Ambient requirements (EN ISO 8497:1996, 9.2) 43? F.5.5?Test pipe temperature (EN ISO 8497:1996, 9.3) 43? F.5.6?Power supply (EN ISO 8497:1996, 7.9) . 43? F.5.7?Axial heat loss (EN ISO 8497:1996, 5.7) . 43? F.5.8?Test period and stability (EN ISO 8497:1996, 9.5.3) . 43? F.6?Calculations (EN ISO 8497:1996, Clause 11) . 43? F.6.1?Thermal conductivity (EN ISO 8497:1996, 3.5) 43? F.7?Symbols and units (EN ISO 8497:1996 Clause 4) 44? Annex G (informative) National A-deviations 46? G.1?Swedish national legislative deviations on steel service pipes . 46? Annex H (informative) Main changes from the previous edition of EN 253 47? Annex I (informative) Waste treatment and recycling . 49? Bibliography 50? BS 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. BS 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 BS 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) BS 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 poly