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BS EN 3480-6:201 2+A1 :201 In corpora tin g corrigen dum October 201 BSI Standards Publication Metallic industrial piping Part 6: Additional requirements for buried piping BS EN 3480-6:201 2+A1 :201 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 3480-6:201 2+A1 :201 It supersedes BS EN 3480-6:201 2, which is withdrawn The UK participation in its preparation was entrusted to Technical Committee PVE/1 0, Piping systems A list of organizations represented on this committee can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 © The British Standards Institution 201 Published by BSI Standards Limited 201 ISBN 978 580 92281 ICS 23.040.01 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 31 July 201 Amendments/corrigenda issued since publication Date Text affected 31 October 201 Implementation of CEN Correction Notice 27 August 201 4: Foreword amended and Annexes Y and ZA updated 31 August 201 Implementation of CEN amendment A1 :201 6: Subclauses A.3.5.6.4 and A.3.5.7 modi f ed EN 13480-6 3480-6:201 2+A1 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM June 20162 July 201 ICS 23.040.01 Supersedes EN 3480-6:2004 English Version Metallic industrial piping - Part 6: Additional requirements for buried piping Tuyauteries industrielles métalliques - Partie 6: Exigences complémentaires relatives aux tuyauteries enterrées Metallische industrielle Rohrleitungen - Teil 6: Zusätzliche Anforderungen an erdgedeckte Rohrleitungen This European Standard was approved by CEN on May 201 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, 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 C O MITÉ EURO P ÉEN D E NO RMALIS ATIO N E U RO P Ä I S C H E S KO M I T E E F Ü R N O RM U N G Management Centre: Avenue Marnix 7, B-1 000 Brussels © 201 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 3480-6:201 2: E BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) Contents Page Foreword Scope Normative references General 3.1 Safety 3.2 Routes .6 3.3 Depth of installation 3.4 Pipes marking and recording .6 3.5 Internal inspection provisions 3.6 Contents removal 3.7 Trench drainage .7 Materials Design and calculation 5.1 Minimum wall thickness for buried piping 5.2 Design .7 Installation 6.1 Trenches 6.2 Pipe laying 6.3 Back filling Sleeves or casings Corrosion protection 8.1 General 8.2 Coatings 8.3 Cathodic protection .1 Examination and testing .1 Annex A (normative) Calculations for buried piping Annex Y (informative) History of EN 3480-6 .35 Annex ZA (informative) Relationship between this European standard and the essential requirements of EU Directive 97/23/EC .36 Bibliography 37 BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) Foreword This document (EN 3480-6:201 2) has been prepared by Technical Committee CEN/TC 267 “Industrial piping and pipelines”, the secretariat of which is held by AFNOR 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 December 201 2, and conflicting national standards shall be withdrawn at the latest by December 201 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 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s) For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document This European Standard EN 3480 for metallic industrial piping consists of seven interdependent and not dissociable parts which are: Part 1: General; Part 2: Materials; Part 3: Design and calculation; Part 4: Fabrication and installation; Part 5: Inspection and testing; Part 6: Additional requirements for buried piping; CEN/TR 13480-7, Guidance on the use of conformity assessment procedures; Part 8: Additional requirements for aluminium and aluminium alloy piping Although these Parts may be obtained separately, it should be recognised that the Parts are inter-dependant As such the manufacture of metallic industrial piping requires the application of all the relevant Parts in order for the requirements of the Standard to be satisfactorily fulfilled This European Standard will be maintained by a Maintenance MHD working group whose scope of working is limited to corrections and interpretations related to EN 3480 The contact to submit queries can be found at http://www.unm.fr (en1 3480@unm.fr) A form for submitting questions can be downloaded from the link to the MHD website After subject experts have agreed an answer, the answer will be communicated to the questioner Corrected pages will be given specific issue number and issued by CEN according to CEN Rules Interpretation sheets will be posted on the website of the MHD BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) This document supersedes EN 3480-6: 2004+A1 : 2005 This new edition incorporates the Amendments/the corrigenda which have been approved previously by CEN members, and the corrected pages up to I ssue without any further technical change Annex Y provides details of significant technical changes between this European Standard and the previous edition Amendments to this new edition may be issued from time to time and then used immediately as alternatives to rules contained herein I t is intended to deliver a new I ssue of EN 3480: 201 each year, consolidating these Amendments and including other identified corrections I ssue (201 4-08) includes the corrected pages listed in Annex Y According to the CEN /CEN ELEC 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, I celand, I reland, I taly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom Foreword to amendment A1 This document (EN 3480-6: 201 2/A1 : 201 6) has been prepared by Technical Committee CEN /TC 267 “Metallic industrial piping”, the secretariat of which is held by AFN OR 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 January 201 7, and conflicting national standards shall be withdrawn at the latest by January 201 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 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s) For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of EN 3480-6: 201 This document includes the text of the amendment itself The amended/corrected pages of EN 3480-6: 201 will be published in the new Edition 201 of the European Standard According to the CEN/CENELEC I nternal 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, I celand, I reland, I taly, Latvia, Lithuania, Luxembourg, Malta, N etherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) Scope This document specifies requirements for industrial piping either totally buried or partly buried and partly run in sleeves or similar protection It is used in conjunction with the other six parts of EN 3480 Where buried piping subject to this standard connects to piping installed under other jurisdiction such as pipelines, the transition should be made at a closing element e.g an isolating or regulating valve separating the two sections This should be close to the boundary of the industrial site, but may be inside or outside the boundary Operating temperature up to 75 °C NOTE For higher temperatures reference should be made to EN 3941 +A1 :201 0, but it should be kept in mind, that CEN/TC 07 only deals with pre-insulated piping with temperatures up to 40 °C and diameters up to 800 mm, which is state of the art for these products Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable 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 3480-1 :201 2, Metallic industrial piping — Part 1: General EN 3480-2:201 2, Metallic industrial piping — Part 2: Materials EN 3480-3:201 2, Metallic industrial piping — Part 3: Design and calculation EN 3480-5:201 2, Metallic industrial piping — Part 5: Inspection and testing General 3.1 Safety a) Buried piping within an industrial site presents a potential hazard to site personal, equipment and environment The sections set out in this document provide guidance as to how the hazard presented by the piping may be assessed, and the integrity of the piping system maintained NOTE b) Attention is drawn to appropriate National or Local regulations The main factors to be considered are: Design including Routing, Layout, Interaction with connecting systems; Materials and Construction Specification and Quality Control; Operating Procedures and Control; Corrosion protection; External Impact Protection and Mitigation BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) All of these factors interact NOTE It is recommended that all buried piping be subjected to a formal hazard analysis procedure NOTE Attention is drawn to appropriate National or Local regulations c) Additional safety requirements may be specified for group fluids according to EN 3480-1 :201 2, including automated means of isolating buried sections of piping 3.2 Routes All routes for buried piping shall be agreed with the owner and operator of the site The site owner shall be required to furnish details of all other actual or planned buried services (including cables) and all roadways or other surface loads within the construction working width or zone of the proposed pipe Piping in category III according to EN 3480-1 :201 shall be separated from any other pipe or service by a minimum distance of 0,25 m unless it can be demonstrated that a smaller distance is acceptable 3.3 Depth of installation In the absence of special protection (e.g concrete slabs) buried piping shall be provided with a minimum cover of 0,8 m The designer shall consider increasing the extent of cover above the minimum where penetrating cold or frost heave of the ground is likely, or where damage from excavation activities is a possibility 3.4 Pipes marking and recording Buried pipes shall be marked by a continuous tape or other agreed means placed directly above the pipe and no closer than 0,3 m All buried pipes shall be identified on as-installed drawings which accurately locate the route relative to structures or other permanent features The site owner may require the route to be physically marked by the use of identification posts or cover slabs at appropriate intervals 3.5 Internal inspection provisions Where periodic internal inspection of buried piping is anticipated, and the specification identifies the method proposed, the designer shall incorporate appropriate means of introducing and removing the inspection devices Such closures, and openings for inspection shall be designed in accordance with EN 3480-3:201 3.6 Contents removal The design of the piping system shall make allowance for the safe filling and removal of the contents This shall include vent and drain points or falls as required, and the selection of appropriate bends and fittings BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) 3.7 Trench drainage The designer shall recognize that pipe trenches for buried piping can act as channels for ground water Appropriate means shall be employed to ensure that the bottom of the trench has sufficient slope to soakaways or sumps to prevent accumulation of water around the piping Where such measures are not possible, the designer shall include the possibility of flotation in the design calculations In addition, the drainage arrangements shall dispose of the hydrostatic test water Care shall be exercised during this operation to ensure that washout of bedding material does not occur Materials Materials shall conform to the requirements of EN 3480-2:201 except that the value for the specified minimum elongation after fracture for the longitudinal direction (see EN 3480-2:201 2, 4.1 4.) shall be 20 % Materials with elongation values less than 20 % shall be avoided, and shall only be used subject to agreement between the purchaser and the designer Design and calculation 5.1 Minimum wall thickness for buried piping Unless the pressure design calculations lead to a greater thickness, the wall thickness of the pipe shall not be lower than the value given in Table Table — Minimum wall thickness for buried piping Nominal size (DN) Minimum thickness mm DN 80 3,2 80 < DN 50 4,7 50 < DN 450 6,35 450 < DN 600 7,9 600 < DN 950 9,5 950 < DN % DN 5.2 Design 5.2.1 A simple single dimensional model linking buried pipes and the surrounding ground may be sufficient for piping designed in accordance with EN 3480-3:201 More complex analysis of pipe to soil interaction may be used where sufficient accurate geo-mechanical data is available, or where the conditions of this annex cannot be met NOTE It is assumed that the loads imposed by the piping on the soil not exceed its load bearing capacity BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) 5.2.2 The designer shall include in the calculations the weight of soil or backfill above the pipe and the maximum predicted value of traffic or other static and dynamic loads imposed on the ground above the pipe With a minimum immediate (first) cover to the pipe of 50 mm of sand, or similar free-flowing material, the forces may be considered as acting over the entire 80° of the upper pipe surface 5.2.3 In addition to calculations at the design pressure, the loadings on the unpressurized system shall be calculated 5.2.4 Pipe movement will be significantly restrained by the frictional force at the interface with the surrounding soil, and may be effectively prevented at buried bends and large branches Unless specific measures are incorporated to permit relative movement, buried pipes shall be considered as fully restrained axially for calculation purposes The axial stress due to combined pressure and temperature change effects shall be calculated as follows: S L S p E ( T ) (1 ) where SL is the longitudinal stress 0,90 x yield strength at design temperature; Sp is the circumferential stress due to pressure alone; T is the maximum temperature range; is Poisson’s ratio 5.2.5 Where no detailed analysis is undertaken, the maximum temperature range (including the installation temperature) shall not exceed 35 °C, and restraining features such as buried bends and tees shall have a separation of not less than DN Where detailed analysis is undertaken, it shall be in accordance with EN 3480-3:201 supplemented by Annex A (normative) 5.2.6 Where seismic events are to be considered, the pipe shall be treated as if rigidly connected to the ground and following the imposed displacements Dynamic amplification may be ignored NOTE The surrounding soil can be considered to effectively dampen all harmonic excitations of the pipe 5.2.7 The designer shall consider the interface between buried and above ground sections of the piping for all design conditions For the static analysis, the buried part shall be considered as clamped for thermal expansion, and it shall be ensured that the flexibility of the above ground part is sufficient in order to limit the loads at the connection of the two parts to acceptable values The designer shall analyse the effects of any anticipated settlement of the buried piping relative to the connected piping overground or in ducts, and shall ensure compliance with the requirements of this document NOTE When gaseous fluids are carried by the piping, the designer should note the likely rise in temperature in the discharge lines of a compressor and corresponding reduction at the outflow from pressure reducing equipment BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) Figure A.3.3.1 -1 26 BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) Figure A.3.3.1 -2 27 BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) A.3.4 Determination of the moments acting upon the piping A.3.4.1 General The equations given hereafter permit the determination of the moments at any point of the piping wall for different loading cases The superposition of these different cases make it possible to account for the behaviour of this piping The stresses equation: ( ) may be derived from the values of the resultant moments M ( ) using the following ( ) M ( ) I/v A.3.4.2 Moments due to backfill and live loads A.3.4.2.1 Load per unit length Figure A.3.4.2.1 M ( ) sin Q Dm π (A.3.4.2.1 -1 ) where Dm is the mean diameter; Q is the total load per unit length with Q F1 F7 (where A.3.3.1 or Q 28 F2 F7 (where A.3.3.1 is applicable) F8 (where A.3.3.2 is applicable), if A.3.2.4 is applicable; is applicable) F8 (where A.3.3.2 is applicable), if A.3.2.5 is applicable BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) A.3.4.2.2 Distributed load In order to take account of backfill and live loads, a less conservative method is given hereafter Figure A.3.4.2.2 0/2 Dm M ( ) q 1 cos sin π π (A.3.4.2.2-1 ) /2 D m 1 sin cos π π M ( ) q (A.3.4.2.2-2) where q Q ; is the load per unit length, related to the mean diameter q Dm Dm is the mean diameter A.3.4.3 Dead load of the pipe M ( ) p cw cos Dm 1 π sin 2 (A.3.4.3-1 ) where pcw is the weight of the pipe per circumferential unit length 29 BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) A.3.4.4 Hydrostatic pressure M ( ) p w Dm cos 1 π sin (A.3.4.4-1 ) where pw is the unit weight A.3.4.5 Taking account of the bedding condition (e.g continuous supporting on sand bed) Figure A.3.4.5 q total Dm 2π q D M ( ) total m 2π M ( ) 2 U K cos π sin cos cos (A.3.4.5-1 ) 2 U K cos (A.3.4.5-2) with U sin ( cos ) (A.3.4.5-3) K sin cos (A.3.4.5-4) where qtotal is the distributed total load (backfill load, dead load and hydrostatic pressure) A.3.5 Global stability of a buried piping system A.3.5.1 General The procedure outlined hereafter allow to check the stability of a buried piping affected by operating pressure and operating temperature changes, for service temperature above 35 °C 30 BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) A.3.5.2 Notations For the purpose of the following paragraphs the notations hereafter shall apply in addition to those in A.3.2.2: S Cross-section of a pipe t Thermal expansion factor t Change in temperature between mounting temperature (backfilling) and operating temperature c Circumferential stress in a pipe caused by internal positive pressure Dm Mean diameter of the pipe Wp Weight per unit length of the pipe I Inertia of the pipe S Cross section of the pipe E Young modulus of the material of the pipe Rultim Allowable deformation factor of the soil A.3.5.3 Load due to pressure and temperature on a straight part of a piping F S ( E t t 0,2 c) (A.3.5.3) a A.3.5.4 Reaction of the soil R t H D t m 2 tan 45 D m (A.3.5.4) A.3.5.5 Determination of the effective length The effective length of a straight part of a piping is given by the following equation: L eff Fa Q Feff (A.3.5.5-1 ) where F '' (2 t Dm Ht Wp) eff (A.3.5.5-2) with ’’ 0,5 Sludge - Clay ’’ 0,4 Sand ’’ 0,3 Gravel 31 BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) A.3.5.6 Restrained pipe For a straight part of a piping, when the sum of the effective lengths determined at each end of this part where relevant is less than the actual length the following checks shall apply A.3.5.6.1 Stability of the restrained part Critical load 11 Fc 4, 09 p q E I S (A.3.5.6.1 -1 ) where p μ" q a q a 0,8 t Dm H t 0,9 Wp q ,9 Wp ,8 t H t Dm tan 45 tan t D m H t and 0,8 and 0,9 are safety coefficients Allowable load Fall Fc ,1 (A.3.5.6.1 -2) The design is acceptable if: Fa Fall (A.3.5.6.1 -3) This verification shall be performed with or without pressure in the pipe and with or without backfilling A.3.5.6.2 Longitudinal compressive stress in the restrained part L E t t 0,3 c (A.3.5.6.2-1 ) where L is the circumferential stress due to pressure The design is acceptable if: L 0,9 R eHt with ReHt as defined in EN 3480-3:201 2, Table 3.2-1 32 (A.3.5.6.2-2) A.3.5.6.3 Stability of the effective length of the pipe Critical load for a radius elbow/bend ,5 D BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) 11 Fc , 25 p q E I S A.3.5.6.3 Stability of the effective length of the pipe Allowable load Critical load for a radius elbow/bend ,5 F Fall c 1 Fc 31, 25 ,1 p q E I S (A.3.5.6.3-1 ) D (A.3.5.6.3-2) (A.3.5.6.3-1 ) The designload shall be acceptable if: Allowable Fa FallFc Fall ,1 A.3.5.6.4 Stress in the effective length of the pipe (A.3.5.6.3-3) (A.3.5.6.3-2) The design shall be acceptable if: Factor K Fa Fall R Din A.3.5.6.4 Stress m the effective length of the pipe K R ultim H Dm (A.3.5.6.3-3) Factor K R Dm K R ultim H Dm (A.3.5.6.4-1 ) Elongation of the effective length taking account of friction (for information) Y1 Factor , c, SE F a R Leff (A.3.5.6.4-2) (A.3.5.6.4-2b) R’ 4 β K 4 E I β S E Feff K (A.3.5.6.4-3a) c Fa (A.3.5.6.4-3b) R ' c c Fa (A.3.5.6.4-3c) Total elongation (for information) Y2 R' β K (A.3.5.6.4-4) 33 33 BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) Bending moment Mf R' β (A.3.5.6.4-5) The design is acceptable if: f Mf 0,9 R eH t I v (A.3.5.6.4-6) A.3.5.7 Unrestrained pipe For a straight part of a piping when the sum of the effective lengths is greater than the actual length the procedure given in A.3.5.6.4 shall apply using Equation (A.3.5.6.4-2) and for L eff the calculated value or L if L eff > L 34 BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) Annex Y (informative) History of EN 3480-6 Y.1 Differences between EN 3480-6:2004 and EN 3480-6:201 The 201 edition of EN 3480-6 contains the 2004 edition of the standard and the Amendment(s) and/or correction(s) issued in the meantime Significant technical changes include: Revision of 5.2 related to the design of the buried piping Addition of the new Annex A related to the calculations for buried piping NOTE The changes referred include the significant technical changes but is not an exhaustive list of all modifications Y.2 List of corrected pages of Issue (201 3-08) Pages 3, and 35 Y.3 List of corrected pages of Issue (201 4-08) Pages 4, 35 and 36 35 BS EN 3480-6:201 2+A1 :201 EN 3480-6:201 2+A1 (E) :201 EN 3480-6:201 (E) (E) Issue (201 4-08) Annex ZA (informative) Relationship between this European standard and the essential requirements of EU Directive 97/23/EC This European Standard has been prepared under a mandate given to CEN by the European Commission to provide a means of conforming to Essential Requirements of the New Approach Directive 97/23/EC of the European Parliament and of the Council of 29 May 997 on the approximation of the laws of the Member States concerning pressure equipment Once this standard is cited in the Official Journal of the European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the clauses of this standard given in Table ZA confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC Clause(s)/subclause(s) of this EN Essential Requirements (ERs) of Directive 97/23/EC, Annex I Qualifying remarks/Notes b) and (a) and (g) Piping as referred to in article 3, section 2.2 Design for adequate strength 2 b) Calculation method 8.1 to 8.3 Corrosion Annex A 2.2 Calculation method WARNING — Other requirements the scope of this standard 36 and other EU Directives may be applicable to the product(s) falling within BS EN 3480-6:201 BS EN 3480-6:201 2+A1 :201 26 EN 3480-6:201 EN 3480-6:201 2+A1 :201262 (E) (E) EN 3480-6:201 Issue (201 4-08) Bibliography [1 ] EN 3941 :2009+A1 :201 0, Design and installation of preinsulated bonded pipe systems for district heating 37 This page deliberately left blank This page deliberately left 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 Reproducing extracts We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions For permission to reproduce 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