BS EN 15632 2 2010 ICS 23 040 01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD District heating pipes — Pre insulated flexible pipe systems Part 2 Bonded plas[.]
BRITISH STANDARD District heating pipes — Pre-insulated flexible pipe systems Part 2: Bonded plastic service pipes — Requirements and test methods ICS 23.040.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN BS EN 15632-2:2010 15632-2:2010 +A1:2014 Incorporating Incorporating Corrigendum Corrigendum November November 2011 2011 BS EN 15632-2:2010+A1:2014 National foreword This British Standard is the UK implementation of EN 15632-2:2010+A1:2014 It supersedes BS EN 15632-2:2010, which is withdrawn The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by 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 The 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 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2010 © The British Standards Institution 2015 Published by BSI Standards Limited 2015 ISBN 978 580 83312 Amendments/corrigenda issued since publication Date Comments 30 November 2011 Implementation of CEN Correction Notice October 2011: cross reference deleted in Clause 5.2.1 31 January 2015 Implementation of CEN amendment A1:2014 EUROPEAN STANDARD EN 15632-2:2010+A1 NORME EUROPÉENNE EUROPÄISCHE NORM December 2014 ICS 23.040.01 Supersedes EN 15632-2:2010 English Version District heating pipes - Pre-insulated flexible pipe systems - Part 2: Bonded plastic service pipes - Requirements and test methods Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles préisolés - Partie 2: Système bloqué avec tube de service en plastique - Prescriptions et méthodes d'essai Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 2: Verbundsysteme mit Mediumrohren aus Kunststoff - Anforderungen und Prüfungen This European Standard was approved by CEN on 10 December 2009 and includes Amendment approved by CEN on November 2014 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-CENELEC 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-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 15632-2:2010+A1:2014 E BS EN 15632-2:2010+A1:2014 EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Contents Page Foreword Introduction Scope Normative references Terms and definitions 4.1 4.2 Classification Operating temperatures and service life .6 Operating pressures 5.1 5.2 5.2.1 5.2.2 5.3 5.4 5.5 Requirements General requirements Service pipes and fittings .7 Quality .7 Oxygen tightness Axial shear strength Linear water tightness Water vapour permeation .7 6.1 6.2 6.3 6.4 Test procedures .8 General Temperature cycle test Axial shear stress Linear water tightness Annex A (informative) Application of Miner's Rule 11 Bibliography 12 BS 15632-2:2010+A1:2014 EN EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Foreword This document (EN 15632-2:2010+A1:2014) 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 June 2015, and conflicting national standards shall be withdrawn at the latest by June 2015 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 15632-2:2010 This document includes Amendment approved by CEN on 2014-11-08 The start and finish of text introduced or altered by amendment is indicated in the text by tags !" This document is one of a series of standards which form several parts of EN 15632, District heating pipes — Pre-insulated flexible pipe systems: Part 1: Classification, general requirements and test methods; Part 2: Bonded system with plastic service pipes; requirements and test methods; Part 3: Non bonded system with plastic service pipes; requirements and test methods; Part 4: Bonded system with metal service pipes; requirements and test methods 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 15632-2:2010+A1:2014 EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Introduction Pre-insulated flexible bonded pipe systems with plastic service pipes are used in district and local heating networks This part of the series of standards for the various types of flexible pipe systems is intended to be used in connection with EN 15632-1 which specifies the basic design criteria for flexible district heating pipes BS 15632-2:2010+A1:2014 EN EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Scope This European Standard provides requirements and test methods for flexible, pre-insulated, directly buried heating pipes with plastics service pipes and bonding between the layers of the pipes This European Standard is valid for maximum operating temperatures of 95 °C and maximum operating pressures up to 10 bar for a design lifetime of at least 30 years This European Standard does not cover surveillance systems NOTE For higher temperatures or for the transport of other fluids, for example potable water, additional requirements and testing is needed Such requirements are not specified in this European Standard 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 15632-1:2009+A1:2014", District heating pipes — Pre-insulated flexible pipe systems — Part 1: Classification, general requirements and test methods EN ISO 15875-1, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PEX) — Part 1: General (ISO 15875-1:2003) EN ISO 15875-2:2003, Plastics piping systems for hot and cold water installations —- Crosslinked polyethylene (PE-X) — Part 2: Pipes (ISO 15875-2:2003) EN ISO 15875-3, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PEX) — Part 3: Fittings (ISO 15875-3:2003) EN ISO 15875-5:2003, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PE-X) — Part 5: Fitness for purpose of the system (ISO 15875-5:2003) EN ISO 15876-1, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part 1: General (ISO 15876-1:2003) EN ISO 15876-2, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part 2: Pipes (ISO 15876-2:2003) EN ISO 15876-3, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part 3: Fittings (ISO 15876-3:2003) EN ISO 15876-5, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part 5: Fitness for purpose of the system (ISO 15876-5:2003) EN ISO 21003-2, Multilayer piping systems for hot and cold water installations inside buildings — Part 2: Pipes (ISO 21003-2:2008) ISO 10147, Pipes and fittings made of crosslinked polyethylene (PE-X) — Estimation of the degree of crosslinking by determination of the gel content ISO 17455, Plastics piping systems — Multilayer pipes — Determination of the oxygen permeability of the barrier pipe BS EN 15632-2:2010+A1:2014 EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Terms and definitions For the purposes of this document the terms and definitions given in !EN 15632-1:2009+A1:2014" shall apply 4.1 Classification Operating temperatures and service life Pipe systems according to this European Standard are designed for a service life of at least 30 years when operated with the following temperature profile: 29 years at 80 °C + year at 90 °C + 100 h at 95 °C Other temperature/time profiles can be applied in accordance with ISO 13760 (Miner's Rule) Further information is given in Annex A The maximum operating temperature shall not exceed 95 °C 4.2 Operating pressures Pipe systems according to this European Standard are designed for continuous operating pressures of bar, bar or 10 bar Table defines the maximum SDR ratios of the service pipe required to withstand the operating pressures Table — SDR ratios required for different operating pressures Operating Pressure Service pipe b ar bar 10 bar PE-X S D R 1 SDR SDR 7,4 PB S D R 3, SDR 11 SDR Multilayer pipes Wall thicknesses shall be calculated according to the methods defined in EN ISO 21003-2 The SDR ratios in Table are based on the regression curves of EN ISO 15875-1 and EN ISO 15876-1 Higher SDR ratios may be applied, if they are based on regression curves developed in accordance with EN ISO 9080 BS 15632-2:2010+A1:2014 EN EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Requirements 5.1 General requirements In addition to the general requirements defined in EN 15632-1 the following product specific requirements apply 5.2 Service pipes and fittings 5.2.1 Quality Service pipes and fittings shall comply with: — EN ISO 15875-1, EN ISO 15875-2, EN ISO 15875-3, EN ISO 15875-5, for pipes made of crosslinked polyethylene (PE-X), !additionally the pipes shall not fail when tested for 15 000 h at 110 °C and at a hoop stress of 2,4 N/mm All requirements of the pipe and fitting according to EN ISO 15875-2 and EN ISO 15875-3 especially the degree of cross-linking shall be met before leaving the production site." — EN ISO 15876-1, EN ISO 15876-2, EN ISO 15876-3, EN ISO 15876-5, for pipes made of polybutylene (PB), !additionally the pipes shall not fail when tested for 15 000 h at 110 °C and at a hoop stress of 2,2 N/mm " — EN ISO 21003-2 for multi-layer pipes Deviating from these standards, temperature cycle tests on service pipes and fittings shall be carried out with test cycle numbers specified in 6.2 5.2.2 Oxygen tightness The oxygen diffusion of service pipes shall not exceed !1,8 mg/m²d" at 80 °C when tested according to ISO 17455 !deleted text" 5.3 Axial shear strength The axial shear strength between the service pipe and the insulation shall be at least 0,09 MPa for plastics pipes and 0,12 MPa for multi-layer pipes, when tested in accordance with 6.3 The test result shall be determined as an average of five measurements 5.4 Linear water tightness When tested in accordance with 6.4, the amount of water leaking through any of the pipe ends shall not exceed 100 g after 168 h 5.5 Water vapour permeation The pipe supplier shall give information about the risk of water accumulation in the insulation dependant on the service conditions NOTE PEX and PB pipes are slightly open for diffusion of water from the media to the insulation The rate of diffusion increases with the temperature The casing is likewise open for diffusion from the insulation to the soil The rate of this diffusion depends on the casing temperature and the water vapour partial pressure difference over the casing wall For BS EN 15632-2:2010+A1:2014 EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) pipes installed under the ground water table there will always be a certain build up of water directly under the casing Experience shows that this build up is limited and not detrimental to the function although a certain loss of insulation capacity may be expected 6.1 Test procedures General Unless stated otherwise, all tests are to be carried out: — no sooner than 72 h after production; — at room temperature; — on samples taken from coiled pipes !Guidelines for testing frequencies and responsibilities are given in EN 15632-1:2009+A1:2014, Annex D." 6.2 Temperature cycle test The test procedure for the thermal cycle test for each material is defined in the standards listed in 5.2.1 The minimum number of test cycles and the cycle times for service pipe system tests are given in Table Table — Test cycles for service pipe system tests 6.3 service pipe outer diameter d2 Test cycles cycle times d2 ≤ 32 mm 000 30 40 mm ≤ d2 ≤ 110 mm 000 30 d2 > 110 mm 50 60 Axial shear stress The axial shear strength between the service pipe and the insulation shall be tested as shown in figure 1, where (1) is the test specimen, (2) is a cylindrical piston pressing onto the service pipe and a support (3) with a cylindrical opening The test specimen (1) shall have a length which equals the outer diameter of the casing ± %, the ends shall be cut at a right angle The piston (2) shall be made from metal and shall have an outer diameter which equals the outer diameter of the service pipe with a tolerance of up to −01 mm The support (3) shall be made of metal, the diameter of the circular central opening shall equal the mean of the inner and outer diameter of the insulation BS 15632-2:2010+A1:2014 EN EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Key test specimen piston for force F support Figure — Shear stress test apparatus The piston (2) and the support (3) are to be moved towards each other with a tensile testing machine at a constant speed of mm per minute and the movement and the force is to be recorded The shear stress τax is to be calculated as follows: τax = F/(L·d2 ·π) in N/m where F is the recorded force in N L is the length of the test in m d2 is the outer diameter of the service pipe in m 6.4 Linear water tightness On a m long sample of the pipe, taken from a pipe in the delivery condition the casing shall be removed 0,1 m at 2,0 m distance from one pipe end BS EN 15632-2:2010+A1:2014 EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) A suitable water container shall be sealed to the casing at both sides of the exposed insulation and be filled with water with a pressure of 0,05 bar at room temperature The sample shall be placed horizontally In both ends of the sample a suitable container shall be mounted to collect water leaking from the pipe end After 168 h, the water collected from the pipe ends shall be weighed 10 BS 15632-2:2010+A1:2014 EN EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Annex A (informative) Application of Miner's Rule For plastic service pipes the lifetime is influenced by the temperature profile For this European Standard a calculated temperature profile has been used The lifetime is calculated by applying Miner's Rule For other temperature profiles a new calculation has to be made District Heating systems are usually operated at various flow temperatures according to the necessary heat load When the actual temperature profile deviates from the standard profile, the system supplier should provide calculations applying Miner's Rule based on the information given in Table A.1: Table A.1 — Examples for applying Miner's Rule Operating Temperature Example Example Example Operating time per year Operating time per year Operating time per year °C h h h 95 3,3 0 90 292 50 50 85 100 000 80 468 200 450 75 000 000 70 410 65 000 60 0 total 763,3 760 500 The total operation time should comply with the annual operation time (max 760 h) For systems operating only for the heating period, the annual operation time might be below 760 h Example is taken from the temperature profile in part which means a total lifetime of 30 years and 100 h When calculated in accordance with Miner's rule example gives an estimated life time of more than 50 years for a service pipe and example an estimated life time of more than 40 years 11 BS EN 15632-2:2010+A1:2014 EN 15632-2:2010+A1:2014 (E) EN 15632-2:2010+A1:2014 (E) Bibliography [1] EN ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation (ISO 9080:2003) [2] ISO 13760, Plastics pipes for the conveyance of fluids under pressure — Miner's rule — Calculation method for cumulative damage 12 blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Revisions We bring together business, industry, 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