EN 13941:2003
(Main)Design and installation of preinsulated bonded pipe systems for district heating
Design and installation of preinsulated bonded pipe systems for district heating
This European Standard specifies rules for design, calculation and installation for preinsulated bonded pipe systems for buried hot water distribution and transmission networks, see. Figure 2, with pipe assemblies in accordance with prEN 253, for continuous operation with hot water at various temperatures up to 120 °C and occasionally with peak temperatures up to 140 °C and maximum internal pressure 25 bar (overpressure).
Application rule:
For larger pipe dimensions and pressures below 25 bar wall thickness bigger than specified in prEN 253 can be required for straight pipes, bends and tees.
The principles of the standard can be applied to preinsulated pipe systems with pressures higher than 25 bar, provided that special attention is paid to the effects of pressure. Adjacent pipes belonging to the network (e.g. pipes in ducts, valve chambers, road crossings above ground etc.) can be designed and installed according to this standard.
The standard assumes use of treated water, which by softening, demineralisation, deaeration, adding of chemicals, or otherwise has been treated to prevent internal corrosion and deposits in the pipes.
This standard is not applicable for such units as
- pumps,
- exchangers,
- boiler installations, tank installations,
- consumer installations.
However, the full functional ability and durability of such units should be ensured in consideration of the impacts from the district heating system and other impacts occurring from the conditions under which they have been installed.
Guidelines for product quality inspection and in situ tests of joints are given in annex A of prEN 448:2002, annex D of prEN 253:2002, annex A of prEN 488:2002 and annex B of prEN 489:2002.
Guidelines for welding of polyethylene casing are given in annex B of prEN 448:2002.
The estimation of expected life with continuous operation at various temperatures is outlined in annex B of prEN 253:2002
Berechnung und Verlegung von werkmäßig gedämmten Verbundmantelrohren für die Fernwärme
Diese Europäische Norm legt Regeln für den Entwurf, die Berechnung und die Verlegung von werkmäßig gedämmten Verbundrohrsystemen für erdverlegte Heißwasserverteilungs und Transportnetze (siehe Bild 2) fest, mit Verbundrohren nach EN 253, für einen kontinuierlichen Betrieb mit Heißwasser bei schwankenden Temperaturen bis 120 °C, zeitweise Spitzentemperaturen bis 140 °C und mit einem maximalen Betriebsdruck von 25 bar (Überdruck).
Anwendungsregel:
Für größere Rohrdurchmesser und Betriebsdrücke unter 25 bar kann für gerade Rohre, Bögen und T Stücke eine höhere Wanddicke als die in EN 253 festgelegte erforderlich sein.
Die Grundsätze der vorliegenden Norm können auch auf werkmäßig gedämmte Rohrsysteme mit Betriebsdrücken über 25 bar angewandt werden, vorausgesetzt, die Auswirkungen der höheren Drücke werden besonders beachtet. Angrenzende Rohre, die dem Netz angehören (z. B. Rohre in Kanälen, Armaturenschächten, oberirdische Straßenüberquerungen usw.), können entsprechend dieser Norm ausgelegt und verlegt werden.
Die Norm setzt die Benutzung von aufbereitetem Wasser voraus, das durch Enthärtung, Entsalzung, Entlüftung, Zusatz von Chemikalien oder auf andere Art und Weise so behandelt worden ist, dass innere Korrosion und Ablagerungen in den Leitungen vermieden werden.
Diese Norm gilt nicht für Geräte bzw. Anlagen, wie z. B.
Pumpen;
Wärmetauscher;
Kesselanlagen, Behälteranlagen;
Einrichtungen der angeschlossenen Kundenanlagen.
Diese Norm setzt voraus, dass die betreffenden Geräte bzw. Anlagen hinsichtlich der Einwirkungen, die vom Fernwärmenetz verursacht werden, und anderen von den baulichen Verhältnissen ausgehenden Belastungen voll funktionsfähig und dauerhaft sind.
Für Produktqualitätskontrolle und Vor Ort Prüfungen von Verbindungen gilt Anhang A von EN 448:2003, Anhang D von EN 253:2003, Anhang A von EN 488:2003 und Anhang B von EN 489:2003.
Für das Schweißen des Polyethylenmantelrohres gilt Anhang B von EN 448:2003.
Die Einschätzung der
Conception et installation des systèmes bloqués de tuyaux pré-isolés pour les réseaux enterrés d'eau chaude
Načrtovanje in vgradnja izoliranih vezanih cevnih sistemov za daljinsko ogrevanje
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Berechnung und Verlegung von werkmäßig gedämmten Verbundmantelrohren für die FernwärmeConception et installation des systemes bloqués de tuyaux pré-isolés pour les réseaux enterrés d'eau chaudeDesign and installation of preinsulated bonded pipe systems for district heating91.140.10Sistemi centralnega ogrevanjaCentral heating systemsICS:Ta slovenski standard je istoveten z:EN 13941:2003SIST EN 13941:2004en01-oktober-2004SIST EN 13941:2004SLOVENSKI
STANDARD
SIST EN 13941:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13941March 2003ICS 91.140.10English versionDesign and installation of preinsulated bonded pipe systems fordistrict heatingConception et installation des systèmes bloqués de tuyauxpré-isolés pour les réseaux enterrés d'eau chaudeBerechnung und Verlegung von werkmäßig gedämmtenVerbundmantelrohren für die FernwärmeThis European Standard was approved by CEN on 27 December 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, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.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 13941:2003 ESIST EN 13941:2004
EN 13941:2003 (E)2ContentspageForeword.6Introduction.71Scope.92Normative references.93Units and symbols.123.1Units.123.2Symbol.124Terms and definitions.135General considerations for system design.175.1General requirements.175.2Service life.185.3Preliminary investigations.185.4Determination of project class.185.4.1Risk assessment.185.4.2Project classes.195.5Design documentation.215.5.1General.215.5.2Operational data.215.5.3Data related to the pipeline.215.5.4Specifications for quality control.236Components and materials.236.1Basic requirements.236.1.1General.236.1.2Non standardised components.246.2Steel pipe components.246.2.1General.246.2.2Documentation.246.2.3Characteristic values for steel.246.2.4Specific requirements for bends and tees.256.2.5Specific requirements for reducers and extensions.266.2.6Specific requirements for other components.266.3Polyurethane foam insulation.266.4PE casing.266.5Expansion cushions.266.6Valves and accessories.276.6.1General requirements.276.6.2Marking and documentation.277Actions and limit states.277.1General.277.2Simplified analysis procedure.297.3Actions.297.3.1General.297.3.2Classification of actions.297.4Limit states.317.4.1General.317.4.2Limit states for service pipes of steel.31SIST EN 13941:2004
EN 13941:2003 (E)37.4.3Composite stress conditions.397.4.4Limit states for PUR and PE.398Installation.408.1General.408.2Transportation and storage.408.3Excavation of pipe trench.408.4Installation of pipes and components.418.4.1General.418.4.2Steel pipes.418.4.3PUR-PE Joints.418.4.4Accessories.418.4.5Expansion zones.418.5Welding of the steel pipe and testing of the steel welds.418.5.1General.418.5.2Quality system for the different project classes.428.5.3Qualification of the welding procedures.448.5.4Welding consumables.448.5.5Place and position of the weld.448.5.6Performance of welding work.448.5.7Special procedures.478.5.8Inspection of the weld joint.478.5.9Documentation.498.6Strength pressure test and leak tightness test.498.7Assembly of casing pipes, joint installation and site insulation.508.8Backfilling of trench.508.9Pipe bends and other components.518.9.1Pipe bends.518.9.2Branches.518.9.3Valves and accessories.528.10Setting into operation.538.10.1General.538.10.2Filling with water for initial operation.538.10.3Surveillance system.538.11Special constructions.538.11.1Special components.538.11.2Above-ground pipelines with preinsulated pipes.538.11.3Insertion into casing pipe.548.12Construction work during the operation stage.54Annex A
(normative)
Design of piping components under internal pressure.55A.1General.55A.2Symbols.55A.3Straight pipe and bends.56A.3.1Straight pipes.56A.3.2Bends.56A.4Tees and branch connections.56A.4.1General aspects and limitations.56A.4.2Reinforcement.56A.5Reducers and extensions.59A.5.1Minimum wall thickness of the cone.59A.5.2Offset reducers.60A.6Dished ends.60Annex B
(informative)
Geotechnics and pipe-soil interaction.61SIST EN 13941:2004
EN 13941:2003 (E)4B.1Scope.61B.1.1General requirements.61B.2Symbols and units.61B.3Soil parameters for global analysis (pipe-soil interaction).61B.3.1Modelling pipe-soil interaction.61B.3.2Pipe to soil friction (axial).63B.3.3Coefficient of horizontal soil reaction (lateral).65B.3.4Combined stiffness of PUR foam, expansion cushions and soil.69B.4Characteristic values for soil loads and soil parameters.72B.4.1General.72B.4.2Soil mechanics study.72B.5Specific requirements for stability.73B.5.1General.73B.5.2Vertical stability.73B.5.3Horizontal stability.75B.6Specific requirements for parallel excavations.75B.6.1General.75B.6.2Reduced friction.75B.7 Requirements for soft soils and settlement areas.75B.7.1General.75B.7.2Differential settlements.76Annex C
(informative)
Global- and cross sectional analysis.77C.1General.77C.2Symbols.77C.3Survey of limit states for steel.79C.4Locations to be assessed.81C.4.1Components to be considered.81C.4.2Areas to be considered.83C.5Actions.83C.5.1General.83C.5.2Action cycles.84C.6Global analysis.85C.6.1General.85C.6.2Flexibility.85C.6.3Boundary conditions.87C.7Calculation of stresses.90C.7.1Simplified procedure.91C.7.2Cross section analyses, steel.91C.7.3Straight pipes.93SIST EN 13941:2004
EN 13941:2003 (E)5C.7.4Bends.95C.7.5Tees.97C.7.6Other components.102C.7.7PUR foam and PE casing.104C.8Fatigue analysis.105C.8.1Fatigue strength data.105C.8.2Fatigue strength data, detailed design.106C.8.3Design fatigue lives.107C.9Further actions.107Annex D
(informative)
Calculation of heat losses.108D.1General.108D.2Heat loss per pipe pair.108D.3Insulance of the soil.109D.4Insulance of the insulation material.109D.5Insulance of the heat exchange between flow and return pipe.109Bibliography.110SIST EN 13941:2004
EN 13941:2003 (E)6ForewordThis document (EN 13941:2003) 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 September 2003, and conflicting national standards shall be withdrawn at thelatest by September 2003.Annex A is normative. Annexes B, C and D are informative.This document includes a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to 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 13941:2004
EN 13941:2003 (E)7IntroductionThis standard has been prepared by JWG1, a joint working group with CEN/TC 267 "Industrial piping and pipelines"According to the scope from CEN/TC 107 The task of CEN/TC107/TC267/JWG1 is to specify rules for design, calculation and installation forpreinsulated bonded pipe systems for underground hot water networks with pipe assemblies co-ordinatedwith EN 253, EN 448, EN 488 and EN 489. CEN/TC107/TC267/JWG1 can also specify rules for functional tests for preinsulated bonded pipe systemsfor underground hot water networks. The basic rules for design, calculation and installation should be based on functional requirements. The purpose of the work is to provide uniform basis for the design, construction and operation of districtheating systems, to ensure that the system is reliable and efficient and safe for the surrounding area, theenvironment and public health. Joint assemblies for pipe systems dealt with should be co-ordinated with EN 489.This standard takes account of experience acquired, of new knowledge available of the behaviour of material and of dis-tribution of stresses and allowable deformations and also evolution in installation techniques.When use is made of the standard, the different sections of which it is made up are interdependent and, because of this,cannot therefore be dissociated.The standard consists of a main part and four annexes.Depending on the character of the individual clauses, distinction is made in this standard between Principles andApplication Rules.The principles comprise:- general statements, definitions and requirements, for which there is no alternative, as well as- requirements and analytical models for which no alternative is permitted unless specifically stated.The principles are printed in normal typeface (10 point font).The application rules are generally recognised rules, which follow the principles and satisfy their requirements.Application rule:The application rules and comments to principles and application rules are printed in a 8 point font. This is an application rule.Alternative design rules can be used instead of the application rules given in this standard, provided that it is shown thatthe alternative rule accords with the relevant principles and it is at least equivalent with regard to the resistance,serviceability and durability achieved by the system.Annex A is part of the standard (principles). Annexes B, C and D have status as application rules.This standard contains a number of requirements aimed at ensuring the sound execution of distribution networks fordistrict heating. To the extent possible, the requirements s
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