Bsi bs en 13480 4 2012 + a3 2016

BS EN 3480-4:201 2+A3:201 BSI Standards Publication Metallic industrial piping Part 4: Fabrication and installation BS EN 3480-4:201 2+A3:201 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 3480-4:201 2+A3:201 It supersedes BS EN 3480-4:201 2+A2:201 which is withdrawn The start and f nish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the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 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 978 580 921 86 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 December 201 Amendments/corrigenda issued since publication Date Text affected 31 October 201 Implementation of CEN amendment A1 :201 31 January 201 Implementation of CEN amendment A2:201 30 November 201 Implementation of CEN amendment A3:201 EN 3480-4:201 2+A3 2+A1 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM November August 201201 ICS 23.040.01 English Version Metallic industrial piping - Part 4: Fabrication and installation Tuyauteries industrielles métalliques - Partie 4: Fabrication et installation Metallische industrielle Rohrleitungen - Teil 4: Fertigung und Verlegung 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 R O 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 3480-4:201 2: E BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) Foreword This document (EN 3480-4:201 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 eight 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 3480-7, 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 interdependent 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 BS EN 1" 3480-4:201 :201 A form for2+A1 submitting contact to submit queries can be found at http://www.unm.fr (en1 3480@unm.fr) ! The 3480-4:201 2+A1an:201 (E) questions can be downloaded from the link to the MHD website After subjectENexperts have agreed 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 This document supersedes EN 3480-4:2002 This new edition incorporates the Amendments/the corrigenda which have been approved previously by CEN members, and the corrected pages up to Issue 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 It is intended to deliver a new Issue of EN 3480:201 each year, consolidating these Amendments and including other identified corrections 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, 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 which have been approved previously by CEN members, and the corrected pages up to Issue without any further technical change Annex Y provides details of significant technical changes between this European Standard and the previous edition BS EN 3480-4:201 2+A3:201 EN immediately 3480-4:201as2+A3:201 6(E) Amendments to this new edition may be issued from time to time and then used alternatives to rules contained herein It is intended to deliver a new Issue of EN 3480:201 each year, consolidating these Amendments and including other identified corrections 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, 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 Foreword to amendment A1 This document (EN 3480-4:201 2/A1 :201 3) has been prepared by Technical Committee CEN/TC 267 “Industrial piping and pipelines”, the secretariat of which is held by AFNOR This Amendment to the European Standard EN 3480-4:201 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by month year of February 201 4, and conflicting national standards shall be withdrawn at the latest by February 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 document includes the text of the amendment itself The amended/corrected pages of EN 3480-4:201 will be published in August 201 as Issue of the European Standard 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 Foreword to amendment A2 This document (EN 3480-4:201 2/A2:201 5) 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 June 201 6, and conflicting national standards shall be withdrawn at the latest by June 201 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 document includes the text of the amendment itself The amended/corrected pages of EN 3480-4:201 will be published as Issue of the European Standard Attention is drawn to the possibility that some of the elements of this document may be the subject of patent5 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 organisations 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 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) Foreword to amendment A3 This document (EN 13480-4:2012/A3:2016) has been prepared by Technical Committee CEN/TC 267 “Metallic industrial piping”, 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 May 2017, and conflicting national standards shall be withdrawn at the latest by May 2017 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 134804:2012 This document includes the text of the amendment itself The amended/corrected pages of EN 134804:2012 will be published in the new Edition 2017 of the European Standard According to the CEN-CENELEC Internal Regulations, the national standards organisations 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 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Contents ! ! Page Foreword 42 Scope Normative references Terms and definitions Symbols General 5.1 Requirements on the manufacturer .8 5.2 Requirements on fabricators and installers of piping and supports .88 5.3 Requirements for fabrication and installation 5.4 Classification of piping 5.5 Material grouping 5.6 Tolerances 99 Cutting and bevelling 6.1 General 6.2 Identification of pressure parts Bending and other forming 7.1 General 7.2 Heat treatment after cold forming 7.2.1 Flat products 7.2.2 Pipes .1 7.3 Heat treatment after hot forming 7.3.1 Material groups , 3, 4, and 7.3.2 Material groups 8.1 and 8.2 7.3.3 Heat treatment after hot forming for material group 7.3.4 Heat treatment after hot forming for clad materials 7.4 Tolerances 7.4.1 Out-of-roundness of bends under internal pressure equal to, or greater than, the external pressure 7.4.2 Out-of-roundness of bends under external pressure and vacuum 7.4.3 Waves at bends 7.4.4 Start-up bulge of induction bends 20 7.5 Surface finish .20 Installation of piping 20 8.1 Fixing and alignment 20 8.2 Field run piping 21 8.3 Flanged or similar mechanical connections .22 8.3.1 Flange connections .22 8.3.2 Threaded connections 23 8.3.3 Couplings and compression fittings 23 8.4 Protection of ends of piping components 23 Welding 23 9.1 Welding personnel .23 9.2 Welding procedure specifications .23 9.3 24 Welding procedures 9.3.1 Verification of suitability .24 9.3.2 Application 24 9.4 Filler metals and auxiliary materials 25 9.5 Climatic conditions 25 9.6 Cleaning before and after welding .25 9.7 Weld joint preparation 25 9.8 Edge protection 26 9.9 Assembly for welding 26 " " BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) ! 9.19.19.1110.1 9.1 ! 9.11 9.1 " ! " ! BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) " Earthing 26 Performance of welding 26 Preheating 26 Striking marks 27 External welds 27 Dissimilar joints 27 9.1 Backing rings 27 9.1 Attachments 27 9.1 3.1 General 27 9.1 3.2 Temporary attachments 27 9.1 3.3 Permanent attachments 28 9.1 Post-weld heat treatment 28 9.1 4.1 General 28 9.1 4.2 Equipment 9.1 4.3 Temperature measurements 32 9.1 4.4 Controlling thickness 32 9.1 4.5 Rate of heating 34 9.1 4.6 Local heat treatment 34 9.1 4.7 Insulation 35 9.1 Weld identification 35 10 Adjustment and repair 35 General 35 0.1 0.2 Adjustment 35 35 0.2.1 Cold hammering 0.2.2 Adjustments by means of heat 35 0.2.3 Adjustment by welding 36 0.2.4 Adjustment by local forging 36 0.3 Weld repair 36 11 Marking and documentation 36 1 Marking of spools and components for installation 36 1 Marking of installed piping 36 1 2.1 General 36 11 2.2 CE Marking of installed piping 37 11 2.3 Technical identification of installed piping 37 12 Additional requirements 2.1 Cleaning 38 2.2 Temporary preservation 38 2.3 External corrosion protection 38 2.4 Thermal and acoustic insulation 38 2.5 Connections for static electricity 39 Annex A Contamination and surface quality of stainless steel 40 Annex B Dimensional tolerances for fabricated spools 43 Annex Y History of EN 3480-4 45 " ( i n fo rm a ti ve ) ( n o rm a ti ve ) ! Annex ZAof EURelationship between this European Standard and the Essential Requirements Directive 97/23/EC " 46 ( i n fo rm a ti ve ) Bibliography 47 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Scope This Part of this European Standard specifies the requirements for fabrication and installation of piping 1systems, Scope including supports, designed in accordance with EN 3480-3:201 systems, including references supports, designed in Normative ! The following documents, in whole or in part, are normatively referenced in this document and are Normative references 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 ISO 9606-1 : 201 3, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1:2012, including Cor 1:2012) —— — Part 1: Steels ISO 4732:201 testing of welding operators and weld setters for , Welding test personnel EN 287-1 :201 , Qualification of welders Qualification Fusion welding mechanized and automatic welding of metallic materials (ISO 14732:2013) : & Welding Metallicpersonnel products ——Types of inspection documents weld setters for fully mechanized and automatic welding ofmetallic materials EN 2952-5:2011 , Water-tube boilers and auxiliary installations — Part 5: Workmanship and construction of  EN pressure parts ofMetallic the boilerproducts  — Types of inspection documents 0204:2004,  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 EN 0204:2004, 41 8:1 997, % EN ISO 3834-2: 2005 Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive quality requirements (ISO 3834-2:2005)& , EN ISO 3834-3:2005, Quality requirements for fusion welding of metallic materials — Part 3: Standard quality requirements (ISO 3834-3:2005) EN ISO 4063:201 0, Welding and allied processes — Nomenclature of processes and reference numbers (ISO 4063:2009, Corrected version 2010-03-01) EN ISO 581 7:2007, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006) EN ISO 3920, Welding — General tolerances for welded constructions — Dimensions for lengths and angles — Shape and position (ISO 13920) EN ISO 5609 (all parts), Specification and qualification of welding procedures for metallic materials — Welding procedure specification EN ISO 561 0:2003, Specification and qualification of welding procedures for metallic materials — Qualification based on tested welding consumables (ISO 15610:2003) EN ISO 561 :2003, Specification and qualification of welding procedures for metallic materials — Qualification based on previous welding experience (ISO 15611:2003) EN ISO 561 2:2004, Specification and qualification of welding procedures for metallic materials — Qualification by adoption of a standard welding procedure (ISO 15612:2004)" BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) EN ISO 561 3:2004, Specification and qualification of welding procedures for metallic materials — ! Qualification based on pre-production welding test (ISO 15613:2004) Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1:2004) EN ISO 7663:2009, Welding — Quality requirements for heat treatment in connection with welding and allied processes (ISO 17663:2009) CEN ISO/TR 5608:2005, Welding — Guidelines for a metallic materials grouping system (ISO/TR 15608:2005) " EN ISO 561 4-1 :2004, Terms and definitions ! For the purposes of this document, the terms and definitions given in EN 3480-1 :201 together with the following apply 3.1 field run piping piping installed without preplanning by drawings of the piping routing and the support points Note to entry: Typical dimensions are DN 50 or smaller 3.2 spool (with or without overlength) prefabricated assembly of components which forms part of a piping system 3.3 cold forming forming at ambient temperature, but not below + °C 3.4 hot forming " for ferritic steels, forming at temperatures at or above the maximum permissible temperature for post-weld heat treatment; for austenitic and austenitic-ferritic steels at temperatures above 300 °C Symbols For the purposes of this Part of this European Standard, the symbols given in EN 3480-1 :201 apply Additional symbols are defined in appropriate clauses of this Part General BS 3480-4:201 2+A1 :201manufacturer 5.1 ENRequirements on the EN 3480-4:201 2+A1 :201 (E) ! " The manufacturer shall be responsible for the fabrication and the installation, even if this work will be sub-contracted to other fabricators and/or installers ! 5.2 Requirements on fabricators and installers of piping and supports " The fabricators and/or installers shall ensure the correct transport, handling, storage, fabrication, installation and testing of all piping components including supports 5.2.1 ! 5.2.3 The fabricators and/or installers shall employ their own responsible supervisors and competent personnel If sub-contractors are employed, the fabricator and/or installer remain responsible for their competence BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) 0.2.3 Adjustment by welding Adjustment by welding, with or without filler metal may be used on welded joints Details such as parameters of the welding procedure (capping pass) shall be specified 0.2.4 Adjustment by local forging Local forging shall only be performed by uniform circumferential heating of the part to be adjusted During the local forging operation, the temperature and the rate of heating and cooling shall be carried out in accordance with a written procedure The requirements of 7.3 shall apply to local forging ! The material characteristics should be taken into account before forging " 0.3 Weld repair !or allImperfections which require repair shall be removed by grinding, gouging, flame, plasma or machining part of the weld When using thermal processes, the pipe and weld material shall not be adversely affected Repair welds shall be made using qualified procedures by qualified welding personnel Prior to repair welding, the surface of all joints shall be examined by NDT to ensure freedom from cracks and other defects The original assessment that led to the repair shall appear in the documentation All weld repairs shall be documented All repaired welds shall be non-destructively tested in accordance with EN 3480-5 ! 11 " Marking and documentation 1 Marking of spools and components for installation All spools and components shall be marked for identification The markings shall be by means of paint, stamping, or tags For materials working in the creep range or under cyclic load, only low-stress stamps shall be used This marking shall remain visible throughout the installation process 1 Marking and identification of installed piping 1 2.1 General To provide clear identification of piping or a piping section, the piping as installed shall be marked by painting, lettering, tagging etc From the markings, it shall be possible to determine the system to which the piping belongs " Marking in accordance with 1 2.2 shall be required if piping of Categories I, II and III is placed at a market in a country where the PED applies 36 35 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) ! 1 2.2 CE Marking of installed piping CE marking shall include a) a single CE marking of each piping or b) for piping installations consisting of more than one piping a single CE mark, provided it is clearly visible and the accompanying documentation supplied by the manufacturer to the user clearly defines the boundary of the installation NOTE See PED guideline 9/8 The marking shall include at least the following information: ) name and address of manufacturer; 2) year of manufacture; 3) identification number of the Notified Body, if applicable The additional information specified in 1 2.3 shall be given either directly at the marking or in a documentation to which the marking clearly refers to, e.g by referencing to the document number 1 2.3 Technical identification of installed piping The following information shall be given either directly at the piping or in documentation accompanying to the piping/piping installation and clearly identifiable to it: a) maximum allowable pressure (PS) in bar; b) maximum allowable temperature (TS max),minimum allowable temperature (TS ) in °C; c) nominal size (DN); d) categories (see EN 3480-1 ); e) fluid group; f) test pressure ( ptest) in bar, and the medium of the pressure test if not water; g) date of pressure test " For practical reasons, the information required by f) and g) may be given in a separate set of documentation like a test pressure map or test pressure circuit map 36 37 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Additional requirements 2.1 Cleaning The condition of the internal and external surfaces of spools, together with the standard of cleanliness shall !be specified Cleaning may be by mechanical means such as wire brushing, by abrasive blasting or by chemical treatment such as pickling in an inhibiting acid NOTE Photographs for comparison of surface cleanliness can be found in EN ISO 8501 -1 After cleaning, spools may be subject to special surface treatments, such as pickling with succeeding passivation of stainless steels " Chemicals involved in cleaning and preparation may be subject to local regulations regarding storage, handling and disposal 2.2 Temporary preservation If the spools are to be stored prior to installation, the cleaned internal surfaces shall be protected from recontamination or rusting by closing the ends with tightly fitting caps or plugs to prevent the ingress of particles and air ! The spools should be further protected by the inclusion of vapour phase inhibiting chemicals in the form of powder in sachets attached to strings, or fine powder in soluble paints spread evenly over the surface Loose pellets are not recommended " All protective caps, plugs and sachets shall be removed immediately prior to installation ! " NOTE Piping can be preserved after installation by purging with dry air and filling with an inert gas such as nitrogen 2.3 External corrosion protection Piping which is subjected to external corrosive influences and is made of materials which are not sufficiently corrosion resistant shall be protected against corrosion Tags and other markings shall be legible after coating 2.4 Thermal and acoustic insulation The installation of the insulation shall, preferably, not start before the inspection of the piping is completed Where installation commences before the inspection of the piping is completed, the areas to be inspected shall be left free until all the required examinations have been carried out The insulation shall in no way impede function and access to devices for safety, operation and measurement 38 37 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) 2.5 Connections for static electricity The piping in an ambient explosive atmosphere shall be installed in such a way that any operation cannot cause any harmful static electricity The resistance measured between piping and earth shall not be more than  ! 38 Special care should be taken in the following cases: — piping completely coated on the inside and outside; — gaskets with metallic core; — valves with insulated internals (cones, balls, needles) " 39 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Annex A (informative) Contamination and surface quality of stainless steel A.1 Introduction !surface The corrosion resistance of stainless steels depends on the presence of a complex oxide coat on the During fabrication, this protective coat can be destroyed by: a) impacts, scratches, sharp edges, etc.; b) coloured oxidation by welding, hot forming, heat treatment, etc.; c) contamination by solvents, various fluids, abrasives, inks, marking, protection materials, grease, etc.; " d) contamination by dust deposits and metallic deposits or incrustations (lead, zinc, copper, aluminium, brass, bronze, iron, galvanised products, zinc paints, etc.) A.2 Protection A.2.1 Handling Lifting and slinging operations should be so conducted as to eliminate the risk of contamination of stainless steel materials ! Metal chains and galvanised wire slings should not be used " Contamination can be avoided by the use of non-metallic (e.g nylon) slings or straps All handling facilities should be kept clean and where necessary segregated for use solely with stainless steel materials A.2.2 During fabrication and installation !installation Control should be exercised to prevent debris or other material entering the piping during fabrication and and the methods of welding and forming should, where practicable, be such as to minimise surface contamination " Where stainless steel surfaces are subject to contact with ferritic or non-ferrous material surfaces, then such possible contamination should be prevented by the use of padding or shims made from material(s) compatible with stainless steel Care should be exercised to avoid contact between stainless steel and the casings of portable power tools, !machines and other tooling/accessories made from materials classed as incompatible in A.1 " Where it is anticipated that there will be contact, the incompatible surface should be covered with approved materials Tools e.g hacksaws, files, grinding stones and discs, stainless steel wire brushes, should be restricted for use on stainless steel materials and should not be used on incompatible materials Saws, drills, cutting tools, chisels etc made from ferritic materials should be cleaned and free of any asperities before use on stainless steel surfaces Cleanliness should be verified before use 40 39 BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) Machining should be carried out using approved lubricants After machining, the machined surface should be cleaned by approved solvents If accidental contamination or damage occurs, particularly impacts, scratches or incrustations, immediate cleaning or grinding should be undertaken, notwithstanding any final chemical treatment or other treatment, generally not designed for such decontamination All sharp edges and scratches should be ground at each stage of fabrication A.3 Controlled cleaning methods Dirt, oil, grease and similar contamination should be removed by the application of an approved solvent For abrasive blasting, the abrasive medium used on stainless steel should be alumina grit (content greater than 98 %) having a water soluble content of less than 50 x -6 The compressed air used for blast cleaning should be clean, dry and oil free High-speed tool steel, tungsten carbide files and rotary burrs should be used for filing and dressing Silicon carbide and aluminium oxide abrasive paper, cloth and preformed stone should be "iron-free" Only stainless steel wire brushes should be used Grinding should be carried out using rubber or resin bonded iron free, aluminium oxide grit grinding wheels Final grinding should be carried out using fine grained wheels (grade 20 minimum) A.4 Chemical treatments A.4.1 Acid pickling When the treatment process requires the surface to be acid cleaned, pre-treatment should be carried out either by the use of a non-caustic alkali paint remover or by the application of white spirit or by immersion in a hot non-ionic detergent solution or pastes specified in the manufacturer’s instructions The acid pickling solution should have a volume fraction of % to % of 50 % concentrated nitric acid, and a volume fraction of % to % of 65 % concentrated hydrofluoric acid in water This solution is mainly for the black welding oxides If necessary, this acid pickling may be preceded by a specific sensitising treatment using a solution with a volume fraction of 65 % Baume sulphuric acid solution for to 50 min, followed by complete washing Acid pickling should be followed by a complete washing 40 41 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) A.4.2 Decontamination, passivation Decontamination and passivation are undertaken by the same treatment Typical solution for bath treatment has a volume fraction of 25 % of 52 % concentrated nitric acid in water Pastes may also be used in accordance with the manufacturer’s instructions !demineralised After acid treatment, components should be thoroughly washed in clean, running water, rinsed with clean water having a minimum temperature of 90 °C, and dried by draining and blowing with clean, dry, oil-free compressed air " A.5 Preparing for shipment When preparing piping for shipment, vapour phase or volatile corrosion inhibitors should not be used on stainless steel Low density polyethylene protection caps should be used and sealed with an approved adhesive tape Where necessary, pipe spools and components should be externally covered with unfilled halogen-free, clear, polyethylene of minimum thickness 00 µm and secured with an approved adhesive tape 42 41 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Annex B (normative) Dimensional tolerances for fabricated spools For the purpose of specifying the dimensional tolerances, fabricated spools shall be classified as follows: Grade A : Spools in very tight piping systems Pipes for which the purchaser specifies exact dimensions Grade B : Spools in piping systems which are flexible enough to accommodate slight discrepancies Grade C : Pipe in a piping system which includes spools with "legs left long" Grade C tolerances shall not be permitted if the spools form part of long vertical legs, since this will affect adjoining horizontal legs being aligned during pipework installation In such cases Grade B shall be used Dimensional tolerances for these grades shall comply with Table B.1 ! Table B.1 — Maximum dimensional tolerances of spools Grade Over DN 50 Dimension number Dimension number 6 A ±1 See 7.4 ±2 ±2 ± 0,5 ± 0,5 ±1 See 7.4 ±2 ±2 ±1 ±1 B ±3 See 7.4 ±3 ±2 ± 0,5 ± 0,5 ±3 See 7.4 ±3 ±3 ±1 ±1 C ±6 See 7.4 ±3 ±2 ± 0,5 ± 0,5 ±6 See 7.4 ±3 ±3 ±1 ±1 NOTE 42 Up to DN 50 See Figure B.1 for dimension numbers " 43 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Key Dimension No : face-to-face dimensions; centre-to-face dimensions ; location of attachments ; centre-to-centre dimensions Dimension No 2: out-of-roundness of bends Dimension No 3: lateral translation of branches or connections Dimension No 4: rotation of flanges, from the indicated position, measured as shown Dimension No 5: bevels on butt weld or plain ends – state diameter to which bevel applies Dimension No 6: out-of-alignment of flanges from the indicated position, measured across the full gasket face diameter Figure B.1 — Dimensional details of spools 44 43 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Annex Y ( i n fo rm a ti ve ) History of EN 3480-4 ! Y.1 Differences between EN 3480-4:201 (Issue ) and EN 3480-4:201 (Issue EN 3480-4:201 2+A1 :201 3) The following is a list of significant technical changes since the previous edition: a) the normative references have been updated; b) in Clause definitions for cold forming and hot forming have been revised; c) in 5.2.3 requirements for employment of sub-contractors added; d) 7.2.1 and Table 7.2.1 -1 on heat treatment after cold forming of flat products have been revised; e) Figure 7.1 3-1 c) has been corrected; f) Clause “Welding” has been revised; g) Table 9.1 4.1 -1 and Table 9.1 4.1 -2 on PWHT have been revised; h) a new Table 9.1 4.1 -3 with Pcrit values for material groups and materials for PWHT has been added; i) 0.3 on weld repairs has been revised; j) Clause 11 “Marking and documentation” has been revised; k) Annex ZA has been aligned; l) the Bibliography has been updated; m) the standard has been editorially revised " The changes referred include the significant technical changes but is not an exhaustive list of all modifica- NOTE tions 44 45 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Annex ZA (informative) ! Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC " !andThisthe European European Standard has been prepared under a mandate given to CEN by the European Commission Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 97/23/EC " 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.1 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 Clauses/sub-clauses of this European Standard Essential Requirements (ERs) of Directive 97/23/EC, Annex I Qualifying remarks/Notes 5.1 to 3, 6, Clause 8, 2.1 to 2.4 and Annex B 3.1 first paragraph Fabrication and installation 6.1 3.1 Cutting and bevelling 6.2 3.1 Identification of pressure parts Clause 3.1 first paragraph Bending and other forming 7.2, 7.3, 9.1 3.1 Heat treatment 8.1 , 8.2, 8.3 a), b) Special requirements for piping 9.1 3.1 Welding personnel 9.3 to 3.1 Welding process Clause 3.1 first paragraph Adjustment and repair 1 3.3 a), b) Marking and identification of piping 46 " 45 BS EN 3480-4:201 2+A3:201 EN 3480-4:201 2+A3:201 6(E) BS EN 3480-4:201 2+A1 :201 EN 3480-4:201 2+A1 :201 (E) Bibliography % EN 287-1 , Qualification test of welders — Fusion welding — Part 1: Steels & ! Welding — Recommendations for welding of metallic materials EN 708-1 , Welding — Basic welded joint details in steel — Part 1: Pressurized components EN 708-3, Welding — Basic weld joint details in steel — Part 3: Clad, buttered and lined pressurized components EN 3445-3, Unfired pressure vessels — Part 3: Design EN 3445-4:2009, Unfired pressure vessels — Part 4: Fabrication" EN 01 (all parts), % EN 41 8, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials& Preparation of steel substrates before application of paints and related products — Visual ! assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates EN ISO 8501 -1 , and of steel substrates after overall removal of previous coatings (ISO 8501-1) EN ISO 9692-1 , Welding and allied processes — Recommendations for joint preparation — Part 1: Manual metal-arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-1) EN ISO 9692-2, Welding and allied processes — Joint preparation — Part 2: Submerged arc welding of steels (ISO 9692-2) EN ISO 9692-4, Welding and allied processes — Recommendations for joint preparation — Part 4: Clad steels (ISO 9692-4) EN ISO 4731 , Welding coordination — Tasks and responsibilities (ISO 14731) CEN/TS 591 -4, Flanges and their joints — Design rules for gasketed circular flange connections — Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment subject to the Pressure Equipment Directive Directive 97/23/EC of the European Parliament of the Council of 29 May 997 on the approximation of the laws of the Member States concerning Pressure Equipment (PED) (Brussels, Official Journal EC, July 997) PED Guideline 9/8 46 " 47 This page deliberately set blank This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS 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