SIST EN 15632-1:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Cevi za daljinsko ogrevanje - Izolirani gibki cevni sistemi - 1. del: Klasifikacija, splošne zahteve in preskusne metodeFernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation, allgemeine Anforderungen und PrüfungenTuyaux de chauffage urbain - Systèmes de tuyaux flexibles préisolés - Partie 1: Classification, prescriptions générales et méthodes d'essaiDistrict heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification, general requirements and test method91.140.10Sistemi centralnega ogrevanjaCentral heating systems23.040.01Deli cevovodov in cevovodi na splošnoPipeline components and pipelines in generalICS:Ta slovenski standard je istoveten z:EN 15632-1:2009SIST EN 15632-1:2009en,fr01-marec-2009SIST EN 15632-1:2009SLOVENSKI
STANDARD



SIST EN 15632-1:2009



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15632-1January 2009ICS 23.040.01 English VersionDistrict heating pipes - Pre-insulated flexible pipe systems - Part1: Classification, general requirements and test methodsTuyaux de chauffage urbain - Systèmes de tuyaux flexiblespréisolés - Partie 1: Classification, prescriptions généraleset méthodes d'essaiFernwärmerohre - Werkmäßig gedämmte flexibleRohrsysteme - Teil 1: Klassifikation, allgemeineAnforderungen und PrüfungenThis 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:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15632-1:2009: ESIST EN 15632-1:2009



EN 15632-1:2009 (E) 2 Contents Page Foreword .4 Introduction .5 1 Scope .6 2 Normative references .6 3 Terms and definitions .7 4 Classification . 12 5 Requirements . 12 5.1 Thermal insulation properties . 12 5.2 Flexibility . 12 5.3 Resistance to external actions . 12 5.4 Insulation Layer . 13 5.4.1 Compressive creep . 13 5.4.2 Water absorption at elevated temperatures . 13 5.5 Casing . 13 5.5.1 UV stability . 13 5.5.2 Thermal stability . 13 5.5.3 Stress crack resistance . 13 5.5.4 Use of rework material . 13 5.6 Surveillance systems . 13 6 Test methods . 14 6.1 Flexibility . 14 6.2 Compressive creep . 15 6.2.1 General . 15 6.2.2 Principles of testing . 15 6.2.3 Test apparatus . 15 6.2.4 Test sample . 16 6.2.5 Test procedure . 17 6.2.6 Calculation and expression of results . 17 7 Marking . 19 7.1 General marking aspects . 19 7.2 Minimum marking information . 19 8 Manufacturer's information . 19 Annex A (normative) Measurement of linear thermal resistance and conductivity of the pipe . 20 A.1 General . 20 A.2 Apparatus . 20 A.3 Test sample . 20 A.4 Test conditions and procedures . 20 A.5 Measurement . 21 A.5.1 Linear thermal resistance of the pipe system . 21 A.5.2 Thermal conductivity of the pipe system . 21 A.6 Declared radial thermal resistance and thermal conductivity . 22 Annex B (normative) Determination of the declared values of the radial thermal resistance of flexible pipe assembly . 23 B.1 Introduction . 23 B.2 Selection of specimen . 23 B.3 Determination of the declared values of the radial thermal resistance . 23 SIST EN 15632-1:2009



EN 15632-1:2009 (E) 3 Annex C (normative) Determination of design values for the radial thermal resistance . 25 Annex D (normative) Calculation of the heat flow from the medium to the ambient (heat loss) . 26 D.1 General . 26 D.2 Calculations . 26 D.2.1 Single pipe system (SPS) . 26 D.2.2 Twin pipe system (TPS) . 27 D.2.3 Radial thermal resistance of the surrounding soil . 27 D.3 Declared values of the radial thermal resistance of buried pipe systems . 27 Bibliography . 28
SIST EN 15632-1:2009



EN 15632-1:2009 (E) 4 Foreword This document (EN 15632-1:2009) 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 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, 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 15632-1:2009



EN 15632-1:2009 (E) 5 Introduction Flexible pipe systems in district heating networks are of common technical usage. In order to assure quality including product-related lifetime, to assure safety in use, economical energy usage and to facilitate comparability in the market, CEN/TC 107 decided to set up standards for these products. SIST EN 15632-1:2009



EN 15632-1:2009 (E) 6
1 Scope This European Standard provides classification, general requirements and test methods for flexible, pre-insulated, directly buried district heating pipe systems. It is intended to be used in conjunction with parts 2, 3, 4, and 5.
Depending on the pipe assembly (see Table 4), this European Standard is valid for maximum operating temperatures of 95 °C to 140 °C and operating pressures of 6 bar to 25 bar. The pipe systems are designed for a lifetime of 30 years. For pipe systems with plastic service pipes, the respective temperature profiles are defined in EN 15632-2 and EN 15632-3. NOTE For the transport of other liquids, for example potable water, additional requirements may be applicable. 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 253:2008, 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 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 744, Plastics piping and ducting systems — Thermoplastics pipes — Test method for resistance to external blows by the round-the-clock-method EN 1605, Thermal insulating products for building applications — Determination of deformation under specified compressive load and temperature conditions EN 1606, Thermal insulating products for building applications — Determination of compressive creep EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens EN 12667, Thermal performance of building materials and products — Determination of thermal resistance by means of guarded hot plate and heat flow meter methods — Products of high and medium thermal resistance EN 13941, Design and installation of preinsulated bonded pipe systems for district heating EN 14419:2003, District heating pipes — Pre-insulated bonded pipe systems for directly buried hot water networks — Surveillance systems EN 60811-4-1:2004, Insulating and sheathing of electric and optical cables — Common test methods — Part 4-1: Methods specific to polyethylene and polypropylene compounds - Resistance to environmental stress cracking - Measurement of the
melt flow index - Carbon black and/or mineral filler content measurement in SIST EN 15632-1:2009



EN 15632-1:2009 (E) 7 polyethylene by direct combustion - Measurement of carbon black content by thermogravimetric analysis (TGA) – Assessment of carbon black dispersion in polyethylene using a microscope (IEC 60811-4-1:2004) EN ISO 8497, Thermal insulation — Determination of steady-state thermal transmission properties of thermal insulation for circular pipes (ISO 8497:1994) EN ISO 9967, Thermoplastics pipes — Determination of creep ratio (ISO 9967:2007) EN ISO 9969, Thermoplastics pipes — Determination of ring stiffness (ISO 9969:2007) EN ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to direct (natural) weathering (ISO 16871:2003) EN ISO 23993, Thermal insulation products for building equipment and industrial installations — Determination of design thermal conductivity (ISO 23993:2008) ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and pyrolysis — Test method and basic specification 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 EN 253:2008, EN 14419:2003 and the following apply. 3.1 lifetime time during which the flexible pipe system operates without failure at the designated operating temperature 3.2 continuous operating temperature
temperature of the heat medium for which the system has been designed to operate continuously NOTE See Table 4 3.3 maximum operating temperature
exceptionally high operating temperature occurring for short periods only 3.4 operating pressure
pressure at which the hot water network is designed to operate continuously 3.5 service pipe medium carrying pipe which is in contact with warm water 3.6 outer casing separately applied outer layer of the pipe assembly, protecting the construction during installation and protecting the construction against external influences (after installation) 3.7 insulation layer layer which provides the designated thermal characteristics of the pipe assembly SIST EN 15632-1:2009



EN 15632-1:2009 (E) 8 3.8 pipe assembly
assembled product, consisting of at least one service pipe, insulating material and casing 3.9 pipe system
pipe assembly, plus service pipe fittings, casing joints, and other components like surveillance elements 3.10 single pipe system SPS pipe system with one service pipe 3.11 twin pipe system TPS pipe system with two service pipes
3.12 bonded system service pipe, insulating material and casing which are bonded by the insulating material 3.13 non bonded system service pipe, insulating material and casing which are not bonded by the insulating material 3.14 casing joint assembly casing joint assembled product, consisting of at least insulating material and casing, designed to protect and thermally insulate a service pipe joint 3.15 ageing factor
fa factor without a dimension which expresses the ageing of the insulating layer in relation to the expected lifetime 3.16 moisture factor fm factor without a dimension for the influence of moisture on the insulating layer in relation to the expected lifetime NOTE The term 'moisture' as it is used here is not identical with the term 'moisture' as it is used in EN 14419. 3.17 ovality difference between the maximum and minimum diameter at a cross section expressed as a percentage of the minimum diameter SIST EN 15632-1:2009



EN 15632-1:2009 (E) 9
Table 1 — Symbols, definitions and dimensions Symbol DescriptionUnitA projected area of the service pipe m2 d1 inner diameter of the service pipe m d1,c inner diameter of the service pipe at the crest of a corrugation m d1,t inner diameter of the service pipe at the trough of a corrugation m d2 outer diameter of the service pipe m d2,c outer diameter of the service pipe at the crest of a corrugation m d2,t outer diameter of the service pipe at the trough of a corrugation m d3 inner diameter of the casing m d3,c inner diameter of the casing at the crest of a corrugation m d3,t inner diameter of the casing at the trough of a corrugation m d4 outer diameter of the casing m d4,c outer diameter of the casing at the crest of a corrugation m d4,t outer diameter of the casing at the trough of a corrugation m F force N fa ageing factor / fcor corrective factor for differences between calculated and measured thermal conductivities / Fexp force resulting from heat expansion N fm moisture factor / Fweight weight force N g acceleration due to gravity m/s2 H earth covering m L length of the
test m M mass of the pipe inclusively the water inside kg Pexp area related load on the insulation resulting from heat expansion of the service pipe Pa Ptest test load Pa Pweight area related load on the cross section of the test specimen of the insulation material Pa q heat flow rate W/m qf radial heat flow rate for buried single pipe system in the flow pipe W/m qf+r radial heat flow rate for buried single pipe system in the flow and return pipe W/m qr radial heat flow rate for buried single pipe system in the return pipe W/m qTPS radial heat flow rate for buried twin pipe system W/m r bending radius in the axis of the pipe m R radial thermal resistance mK/W R,ϑav radial thermal resistance of a twin pipe system at any average temperature mK/W R0 thermal transmittance factor from earth surface to ambient air m2K/W Rdecl declared value of radial thermal resistance mK/W Rdecl,ϑav declared value of thermal resistance at average temperature mK/W Rdesign design value for the radial resistance mK/W Rf radial thermal resistance of the flow pipe mK/W Rr radial thermal resistance of the return pipe mK/W Rs radial thermal resistance of the soil mK/W RTPS radial thermal resistance of a twin pipe system mK/W RTPS,ϑav radial thermal resistance of a twin pipe system at any average temperature mK/W s thickness mm SDR ratio of nominal outer diameter and nominal wall thickness /
SIST EN 15632-1:2009



EN 15632-1:2009 (E) 10
Table 2 — Symbols, definitions and dimensions (continued)
smin minimum wall thickness mm sSTB thickness of test piece after load testing and temperature testing mm τax shear stress N/m2 U coefficient of heat loss W/(mK) Uf coefficient of heat loss for buried single pipe system W/(mK) Ur coefficient of heat loss for buried single pipe system in the return pipe W/(mK) UTPS coefficient of heat loss in a twin pipe system W/(mK) Z depth of laying distance from the center line of the pipe to the surface m Zcor corrected minimum value for thermal transmittance on the surface of the earth m λϑav thermal conductivity of a pipe system at any average
temperature W/(mK) C thermal conductivity of the casing W/(mK) decl declared thermal conductivity of a pipe system W/(mK) λdecl,ϑav declared value of thermal conductivity at average temperature W/(mK) design calculation value of the thermal conductivity of the insulation material W/(mK) I thermal conductivity of the insulation W/(mK) s thermal conductivity of the soil W/(mK) S
thermal conductivity of the service pipe W/(mK) λTPS,ϑav thermal conductivity of a twin pipe system at any average temperature W/(mK) ϑ1 temperature at the inner diameter of the service pipe K ϑ1,f temperature at the inner diameter of the service flow pipe
K ϑ1,r temperature at the inner diameter of the service return pipe K ϑ2 temperature at the outer diameter of the service pipe K ϑ4 temperature at the outer diameter of the casing K ϑamb ambient temperature K ϑav average temperature K ϑfflow temperature K ϑr return temperature K ϑs temperature of the soil K
compression mm
SIST EN 15632-1:2009



EN 15632-1:2009 (E) 11 Table 3 — Indices Symbol Definition 0
thermal transmittance (from earth surface to ambient air) 1 position at the inner diameter of the service pipe 2 position at the outer diameter of the service pipe 3 position at the inner diameter of the casing 4 position at the outer diameter of the casing a ageing amb ambient av average ax axial c crest of a corrugation C casing bzw. casing pipe cor corrective decl declared design design exp expansion f flow I insulation m moisture min minimal r return S service pipe s soil STB stability t trough of a corrugation test test TPS twin Pipe System weight weight x placeholder for 1,2,3 or 4 ϑav average temperature
Table 4 — Abbreviations Abbreviation Name PB polybutylene PE-HD high density polyethylene PE-LD low density polyethylene PE-X cross linked polyethylene PE-Xb silane cross linked polyethylene SIST EN 15632-1:2009



EN 15632-1:2009 (E) 12 4 Classification With Table 4 the field of application for the different designs of pipe assembly are defined. Table 5 — Classification system
Part of this standard Service pipe material
Pipe assembly design Field of application Operating pressure bar Continuous operating temperature °C Maximum operating temperature °C 2 plastics bonded 6, 8 or 10 80 95 3 plastics non bonded 6, 8 or 10 80 95 4 metal bonded 16 or 25 120 140
For operating pressures and temperature/time profiles see part 2, 3 or 4. 5 Requirements 5.1 Thermal insulation properties The manufacturer shall submit values for the heat loss of buried pipe assemblies for all pipe dimensions in accordance with Annex D, rounded to 0,001 W/mK. NOTE Annex A specifies how to measure thermal properties, Annex B specifies how to calculate declared values for thermal properties of all pipe dimensions, and Annex C specifies how to include ageing effects. 5.2 Flexibility
The flexibility of the pipe assembly is verified by testing at the minimum bending radius. The manufacturer of the pipe assembly shall declare the minimum installation bending radii for all dimensions produced, related to the central axis of the pipe assembly. The minimum declared installation bending radius of the pipe assembly according to this European Standard shall not exceed thirty times the outer diameter of the casing. When bending to the minimum radius, the service pipe and the casing of the pipe assembly shall not break, and the ovality of the outer casing shall not exceed 30 % when tested according to 6.1.
Cracks in the insulation material at the casing shall not exceed a width of 5 mm . 5.3 Resistance to external actions When tested according to EN ISO 9969 the ring stiffness of the pipe assembly shall be at least 4 kN/m² and the ring stiffness divided by the creep ratio according to EN ISO 9967 shall be at least 0,8. When tested according to EN 744 the outer casing of pipe assemblies and casing joints shall show no cracks when exposed to an impact of 4 J.
NOTE The deformation of buried pipes with and without traffic load can be calculated according to EN 1295-1. SIST EN 15632-1:2009



EN 15632-1:2009 (E) 13 5.4 Insulation Layer 5.4.1 Compressive creep
When tested according to 6.2, the insulation shall not be compressed by more than 10%. 5.4.2 Water absorption at elevated temperatures When tested in accordance with EN 489, the water absorption shall not exceed the limits of one of the test options defined in Table 5. Table 6 — Test option for water absorption
Test option Test temperature °C Water absorption (by volume) % A 100 10 B 80 1
5.5 Casing 5.5.1 UV stability Casings shall be made of a material containing at least 2 % by mass of carbon black (determined in accordance with ISO 6964). Otherwise the requirements of clauses 5.2 and 5.3 shall still be fulfilled after an exposure to an energy of ≥ 3,5 GJ/m² in accordance with EN ISO 16871. 5.5.2 Thermal stability
The oxidation induction time of the material to be used for the casing shall be at least 20 minutes at 210 °C when tested in accordance with EN 728. 5.5.3 Stress crack resistance The time for the stress crack resistance of PE-HD materials used for the casing shall be at least 100 hours when tested at 4 MPa and 80 °C in accordance to ISO 16770. NOTE The test may be carried out on samples prepared by compression moulding, injection moulding or extrusion from the same raw material as being used for the production of the casing. PE-LD materials used for the casing shall not exceed a failure rate F20 when tested for 1000 hours in accordance with EN 60811-4-1:2004, procedure B. 5.5.4 Use of rework material If rework material is used, only clean, not degraded, rework material generated from the manufacturer's own production of pipes, shall be used. 5.6 Surveillance systems If measuring elements for surveillance systems are being installed in flexible pipe systems, all elements installed and the installation in pipe systems shall comply with the requirements of EN 14419 SIST EN 15632-1:2009



EN 15632-1:2009 (E) 14 6 Test methods 6.1 Flexibility The pipe assembly shall be conditioned for twenty four hours at the minimum temperature according to the manufacturer's installation instructions. Afterwards the pipe assembly shall be fixed onto a bending rig according to Figure 1 within ten minutes. After thirty minutes the ovality shall be measured at the position shown in Figure 1.
Key 1 pipe assembly 2 bending rig 3 straps or clamps 4 measuring points for ovality Figure 1 — Flexibility test After measuring the ovality the outer casing shall be opened in the axial direction and visual inspection of the insulation material of the whole bend section shall be carried out. SIST EN 15632-1:2009



EN 15632-1:2009 (E) 15 6.2 Compressive creep
6.2.1 General The test procedure for the compressive creep at elevated temperatures of the insulation material shall be carried out in a similar way to EN 1606 (respectively EN 1605). In addition to these tests the following changes/additions in testing are standardised in order to reflect the special situation of insulation procedures for flexible pipe systems. NOTE Table 6 and the test are based on the "Findley equation" (see EN 1606). The traceability of the logarithmic coherence and the adequate verification of the test should be shown by calculation (with the squared factor for accuracy of determination larger than 0,9). 6.2.2 Principles of testing The compressive creep of samples under pressure is tested by measuring the increase of deformation of a test sample under a constant pressure load and defined conditions respecti
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