EN 15698-2-2015 en District heating pipes - Preinsulated bonded twin pipe systems for directly buried hot water networks - Part 2 Fitting and valve assembly of steel service pipes .pdf

1、BSI Standards PublicationBS EN 15698-2:2015District heating pipes Preinsulated bonded twin pipesystems for directly buried hotwater networksPart 2: Fitting and valve assembly ofsteel service pipes, polyurethane thermalinsulation and outer casing of polyethyleneBS EN 15698-2:2015 BRITISH STANDARDNati

2、onal forewordThis British Standard is the UK implementation of EN 15698-2:2015.The UK participation in its preparation was entrusted to TechnicalCommittee RHE/9, Insulated underground pipelines.A list of organizations represented on this committee can beobtained on request to its secretary.This publ

3、ication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 84513 0ICS 23.040.10Compliance with a British Standard cannot confer immunity

4、fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS EN 15698-2:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15698-2 August 2015 ICS 23.040.10

5、English Version District heating pipes - Preinsulated bonded twin pipe systems for directly buried hot water networks - Part 2: Fitting and valve assembly of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene Tuyaux de chauffage urbain - Systmes bloqus de bitubes p

6、risols pour les rseaux deau chaude enterrs directement - Partie 2 : Assemblages de raccords et dappareils de robinetterie pour tubes de service en acier, isolation thermique en polyurthane et protection extrieure unique en polythylne Fernwrmerohre - Werkmig gedmmte Verbundmanteldoppelrohre fr direkt

7、 erdverlegte Fernwrmenetze - Teil 2: Verbundformstck und vorgedmmte Absperrarmatur, bestehend aus Stahl-Mediumrohr, Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was approved by CEN on 3 July 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulatio

8、ns 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. T

9、his 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 me

10、mbers 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, Port

11、ugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any f

12、orm and by any means reserved worldwide for CEN national Members. Ref. No. EN 15698-2:2015 EBS EN 15698-2:2015EN 15698-2:2015 (E) 2 Contents Page European foreword .3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Requirements .8 4.1 General 8 4.2 Steel parts .9 4.3

13、Welding of steel parts .9 4.3.1 Welding of steel pipes and elements .9 4.3.2 Welding of fixing bars .9 4.3.3 Placing of the fixing bars 9 4.4 Casing .9 4.5 Polyurethane rigid foam insulation (PUR) 9 4.6 Fitting and valve assemblies 9 4.7 Requirements for effective operation and maintenance 10 4.8 Su

14、rveillance system . 10 5 Test methods . 10 6 Marking 10 6.1 General . 10 6.2 Steel service pipe 11 6.3 Casing 11 6.4 Fitting assembly 11 6.5 Steel valves and valve assembly 11 Annex A (normative) Waste treatment and recycling . 12 Annex B (informative) Examples of twin pipe fitting assemblies 13 BS

15、EN 15698-2:2015EN 15698-2:2015 (E) 3 European foreword This document (EN 15698-2:2015) has been prepared by Technical Committee CEN/TC 107 “Prefabricated district heating and district cooling pipe system”, the secretariat of which is held by DS. This European Standard shall be given the status of a

16、national standard, either by publication of an identical text or by endorsement, at the latest by February 2016 and conflicting national standards shall be withdrawn at the latest by February 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of

17、 patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. 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

18、, 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

19、 and the United Kingdom. BS EN 15698-2:2015EN 15698-2:2015 (E) 4 Introduction EN 15698-1:2009 was published with the following title: District heating pipes - Preinsulated bonded twin pipe systems for directly buried hot water networks - Part 1: Twin pipe assembly of steel service pipe, polyurethane

20、 thermal insulation and outer casing of polyethylene. EN 15698-2 is a complement to the following existing European Standards for district heating bonded single and twin pipe systems: EN 448, District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Fitting a

21、ssemblies 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 casin

22、g of polyethylene. EN 15698-2 gives additional requirements for fitting and valve assemblies used in bonded twin pipe systems. Waste management and recycling of materials is dealt with in Annex A. Other standards from CEN/TC 107 are: EN 253, District heating pipes - Preinsulated bonded pipe systems

23、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, polyureth

24、ane 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 15632 (all parts)

25、, District heating pipes - Pre-insulated flexible pipe systems. BS EN 15698-2:2015EN 15698-2:2015 (E) 5 1 Scope This European Standard specifies requirements and test methods for fittings of prefabricated thermally insulated twin pipe assemblies comprising steel service fittings and/or valves from D

26、N 15 to DN 250, rigid polyurethane foam insulation and an outer casing of polyethylene for use in directly buried hot water networks with preinsulated twin pipe assemblies in accordance with EN 15698-1:2009. This European Standard covers the following: fitting assemblies, such as T-pieces, reducers

27、and anchors; valve assemblies. This European Standard applies only to insulated fitting assemblies for continuous operation with hot water at various temperatures in accordance with the scope EN 15698-1:2009. This European Standard applies to fitting and valve assemblies with a minimum design pressu

28、re of 16 bar (overpressure) complying with EN 13941. Guidelines for quality inspection and testing of fitting assemblies are given in EN 448:2015, Annex A and EN 15698-1:2009, Annex A. Guidelines for quality inspection and testing of valve assemblies are given in EN 488:2015, Annex A and EN 15698 -1

29、:2009, Annex A. Procedures for PE-welding are given in EN 448:2015, Annex B. NOTE This European Standard does not include rules for calculation of loads and stresses. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensabl

30、e for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 253:2009+A2:2015, District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks

31、 - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene EN 448:2015, District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Fitting assemblies of steel service pipes, polyurethane thermal insulation and oute

32、r casing of polyethylene EN 488:2015, 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 10204, Metallic products - Types of inspection do

33、cuments 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 15698-1:2009, District heating pipes - Preinsulated bonded twin pipe

34、 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 15698-2:2015EN 15698-2:2015 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in E

35、N 253:2009+A2:2015 and the following apply. 3.1 anchor construction used to transfer the loads from the steel service pipe through the insulation and the casing to a fixed point 3.2 bending angle deviation in direction of the steel pipe centre lines 3.3 butt welding bend bend manufactured either by

36、hot bending of steel pipe or by hot forming of steel plates that are subsequently welded together 3.4 transition assembly preinsulated fitting to connect single and twin pipe 3.5 cap not pre-insulated fitting to be welded on the end of a pipe or pipe element 3.6 cold formed bend bend manufactured by

37、 cold bending of steel pipe 3.7 fitting reducer, tee, factory-made elbow and bend, cap, welding stub, mechanical joint 3.8 fixing bars steel plates used for bonding of flow and return pipes to eliminate various expansions of straight pipe sections on the fittings 3.9 forged T-piece T-piece manufactu

38、red by hot forming of either steel pipes or steel plates that are subsequently welded together 3.10 horizontal bend bend in the horizontal plane 3.11 house entry bend bend assembly with 90 twisted service pipe used for house connections 3.12 hot formed bend bend manufactured by heating pipe during b

39、ending BS EN 15698-2:2015EN 15698-2:2015 (E) 7 3.13 induction bend bend manufactured by induction bending 3.14 induction bending continuous bending process that utilizes induction heating to create a narrow, circumferential, heated band around the material being bent 3.15 joint end end of the assemb

40、ly (300 mm long, measured from end of service pipe) which is prepared for connection to another assembly (service pipe welded together and casing connected with a joint) 3.16 nominal size DN numerical metric designation of size, common to components in piping systems which are used for reference pur

41、poses 3.17 reducer butt welding fitting to be welded between steel pipes or fittings of different diameters 3.18 single pipe assembly technical solution of district heating pipes with one steel service pipe in one casing SOURCE: EN 15698-1:2009, 3.1 3.19 twin pipe assembly technical solution of dist

42、rict heating pipes with two steel service pipes in one casing SOURCE: EN 15698-1:2009, 3.2 3.20 twisting of service pipes tendency of the service pipes of a twin pipe assembly to twist around each other SOURCE: EN 15698-1:2009, 3.3 3.21 vertical bend bend in the vertical plane 3.22 surveillance syst

43、em system that consists of measuring sections and measuring instruments for surveillance of pipe systems according to EN 14419 3.23 welded T-piece butt welding fitting manufactured by welding together pieces of steel pipes with or without the use of a welding saddle or a drawn collar on the main pip

44、e BS EN 15698-2:2015EN 15698-2:2015 (E) 8 3.24 welding saddle butt welding fitting to be welded into the main pipe for the welded connection between the main pipe and the branch pipe in a T-piece Note 1 to entry: For examples of fittings, see Figure 1. Note 2 to entry: For examples of twin pipe fitt

45、ing and valve assemblies, see Annex B. Key a cold or hot formed bends b butt welding bend or elbows c bending angle, d forged T-piece e T-piece with welding saddle f T-piece with drawn collar g directly welded T-piece Figure 1 Examples of fittings SOURCE: EN 448:2015, 3.17, modified Note 2 to entry

46、has been added. 4 Requirements 4.1 General The material of pressurized steel parts shall be certified, with a 3.1 material certificate, in accordance with EN 10204. If traceability on materials is required by the end user, it shall be specified at the time of ordering. Corresponding material certifi

47、cates shall be delivered to the end user if specified at the time of ordering. All components shall be designed in accordance with EN 13941, for the actions and stresses that normally occur during a systems entire service life. BS EN 15698-2:2015EN 15698-2:2015 (E) 9 4.2 Steel parts The requirements

48、 for the quality and the dimensions of the steel parts, such as wall thickness and diameter and components shall be in accordance with EN 448. 4.3 Welding of steel parts 4.3.1 Welding of steel pipes and elements Fusion welding between the steel parts in different fitting and valve assemblies shall b

49、e in accordance with EN 448. The quality of the steel ends of the fittings shall match with the steel service pipes. 4.3.2 Welding of fixing bars The fixing bars shall be welded to the pipes according to the requirements of EN 13941. 4.3.3 Placing of the fixing bars Fixing bars shall be welded to the straight part of the twin pipe fittings at transition assembly at the twin pipe part of fitting assemblies, horizontal and vertical bends from both sides of bended area, reducers at the largest pipe diameter, tees at