Bsi bs en 13110 2012 + a1 2017

BS EN 31 0:201 2+A1 :201 BSI Standards Publication LPG equipment and accessories — Transportable refillable welded aluminium cylinders for liquefied petroleum gas (LPG) — Design and construction BS EN 31 0:201 2+A1 :201 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 31 0:201 2+A1 :201 It supersedes BS EN 31 0:201 which is withdrawn The start and f nish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the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 9, LPG containers and their associated f ttings 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 90764 ICS 23.020.30 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 May 201 Amendments/corrigenda issued since publication Date Text affected 28 February 201 Implementation of CEN amendment A1 :201 EUROPEAN STANDARD EN 13110:2012+A1 NORME EUROPÉENNE EUROPÄISCHE NORM January 2017 ICS 23.020.30 English Version LPG equipment and accessories - Transportable refillable welded aluminium cylinders for liquefied petroleum gas (LPG) - Design and construction Equipements pour gaz de pétrole liquéfiés et leurs accessoires - Bouteilles soudées transportables et rechargeables en aluminium pour gaz de pétrole liquéfié (GPL) - Conception et construction Flüssiggas-Geräte und Ausrüstungsteile Ortsbewegliche wiederbefüllbare geschweißte Flaschen aus Aluminium für Flüssiggas (LPG) Auslegung und Bau This European Standard was approved by CEN on 13 April 2012 and includes Amendment approved by CEN on January 2017 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I TÉ E URO P É E N D E N O RM ALI S ATI O N E URO PÄI S C H E S KO M I T E E FÜR N O RM UN G CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 13110:2012+A1:2017 E BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Contents Page European foreword Introduction Scope Normative references 3.1 3.2 Terms, definitions and symbols Terms and definitions Symbols Materials 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 Design 11 General requirements 11 Calculation of cylindrical wall thickness 11 Design of ends concave to pressure 11 Other shapes of ends 12 Minimum wall thickness 12 Design of openings 12 Neck design 13 Stability 17 Valve protection 17 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Construction and workmanship 17 Environment 17 Welding qualification 17 Plates and pressed parts 18 Welded joints 18 Tolerances 18 Non-pressure bearing attachments 18 Heat treatment 19 Closure of openings 19 7.1 7.2 7.3 7.3.1 7.3.2 7.3.3 7.4 7.4.1 7.4.2 7.4.3 7.5 7.5.1 7.5.2 7.5.3 7.6 Testing and examination 20 General 20 Types of test and evaluation of test results 20 Test specimens and related tests and examinations 21 Two piece cylinders 21 Three piece cylinders 21 Valve boss welds 21 Tensile test 23 General 23 Parent material 23 Welds 23 Bend test 23 Bend test on parent material 23 Bend test across the welds 24 Nick-break test across the welds 24 Macroscopic examination of welds 26 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) 7.6.1 7.6.2 7.7 7.7.1 7.7.2 7.8 7.8.1 7.8.2 7.9 7.9.1 7.9.2 7.10 7.10.1 7.10.2 7.11 7.11.1 7.11.2 7.11.3 7.12 7.12.1 7.12.2 Procedure 26 Requirements 26 Burst test under hydraulic pressure 27 Procedure 27 Requirements 28 Fatigue test 28 Procedure 28 Requirements 29 Drop test 29 Procedure 29 Requirements 29 Visual examination 29 Procedure 29 Requirements 29 Radiographic examination 30 Procedure 30 Assessment 30 Requirements 30 Pressure test 30 Procedure 30 Requirements 30 8.1 8.2 8.3 Technical requirements for type approval 32 New cylinder design 32 Extent of testing 32 Type approval certificate 33 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.7.1 9.7.2 9.7.3 9.7.4 9.8 9.8.1 9.8.2 9.8.3 9.8.4 9.8.5 Production testing and examination requirements 33 Tests and examinations applicable to all cylinders 33 Radiographic examination 34 Macro examination 34 Examination of valve boss weld 34 Examination of non-pressure containing attachment welds 34 Unacceptable imperfections found by radiographic or macro examinations 34 Production batch testing (mechanical/burst tests) 35 Production batch 35 Inspection lots 36 Rate of sampling 36 Additional checks 36 Failure to meet mechanical and burst test requirements 37 Mechanical 37 Burst 37 Production batch retest 37 Resubmission of a production batch 37 Weld repairs 38 10 Marking 38 11 Certificate of Conformity 38 Annex A (normative) Corrosion tests 39 A.1 Test for assessing susceptibility to intercrystalline corrosion 39 A.1.1 Specimens 39 A.1.2 Pre-treatment of the specimen before corrosive etching 39 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) A.1.2.1 Chemicals required 39 A.1.2.2 Method 39 A.1.3 Corrosive etching process 40 A.1.3.1 Chemicals required 40 A.1.3.2 Method 40 A.1.4 Preparation of specimens for examination 41 A.1.4.1 Method 41 A.1.5 Micrographic examination of specimens 41 A.1.6 Interpretation of the micrographic examination 41 A.2 Tests for assessing susceptibility to stress corrosion 41 A.2.1 Specimens 41 A.2.2 Surface preparation before test 41 A.2.3 Method 42 A.2.3.1 Preparation of the corrosive solution 42 A.2.3.2 Applying the stress to the specimen 44 A.2.4 Interpretation of the results 46 A.2.5 Metallographical examination (additional examination) 46 A.3 Conclusion of corrosion tests 46 A.4 Test report 46 Bibliography 48 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) European foreword This document (EN 13110:2012+A1:2017) has been prepared by Technical Committee CEN/TC 286 “Liquefied petroleum gas equipment and accessories”, the secretariat of which is held by NSAI This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017 This document includes Amendment approved by CEN on 03 January 2017 This document supersedes ! EN 13110:2012 " The start and finish of text introduced or altered by amendment is indicated in the text by tags ! " 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 supersedes EN 13110:2002 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) This standard has been submitted for reference into the RID and/or in the technical annexes of ADR (see [9] and [8] ) The main technical changes to this revision include the addition of: — reference to the latest welding standards; — the introduction of radioscopy as a permitted alternative to radiographic examination of welds; — simplification of the marking requirements by reference to EN 14894; and — environmental considerations recorded in Annex B 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Introduction This European Standard calls for the use of substances and procedures that may be injurious to health and/or the environment if adequate precautions are not taken It refers only to technical suitability: it does not absolve the user from their legal obligations at any stage ! Protection of the environment is a key political issue in Europe and elsewhere For CEN/TC 286, this is covered in CEN/TS 16765 This Technical Specification should be read in conjunction with this European Standard " It is recommended that manufacturers develop an environmental management policy For guidance see ISO 14000- series Provisions need to be restricted to a general guidance Limit values are specified in national laws It has been assumed in the drafting of this European Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people All pressures are gauged unless otherwise stated NOTE This European Standard requires measurement of material properties, dimensions and pressures All such measurements are subject to a degree of uncertainty due to tolerances in measuring equipment etc It may be beneficial to refer to the leaflet “measurement uncertainty leaflet” SP INFO 2000 27 [11] BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Scope This European Standard specifies minimum requirements for material, design, construction and workmanship, testing and examination during the manufacture of transportable refillable welded aluminium liquefied petroleum gas (LPG) cylinders, having a water capacity from 0,5 l up to and including 150 l, exposed to ambient temperature 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 10204:2004, Metallic products - Types of inspection documents EN 12816, LPG equipment and accessories - Transportable refillable LPG cylinders - Disposal EN 14717, Welding and allied processes - Environmental check list Non-destructive testing - Industrial computed radiography with storage phosphor imaging plates - Part 1: Classification of systems EN 14784-2, Non-destructive testing - Industrial computed radiography with storage phosphor imaging plates - Part 2: General principles for testing of metallic materials using X-rays and gamma rays EN 14894, LPG equipment and accessories - Cylinder and drum marking EN ISO 4136, Destructive tests on welds in metallic materials - Transverse tensile test (ISO 4136) EN ISO 5173, Destructive tests on welds in metallic materials - Bend tests (ISO 5173) EN ISO 5178, Destructive tests on welds in metallic materials - Longitudinal tensile test on weld metal in fusion welded joints (ISO 5178) EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-1) EN ISO 9606-2, Qualification test of welders - Fusion welding - Part 2: Aluminium and aluminium alloys (ISO 9606-2) ! EN ISO 9712:2012, Non-destructive testing - Qualification and certification of NDT personnel (ISO 9712:2012)" EN ISO 10042:2005, Welding - Arc-welded joints in aluminium and its alloys - Quality levels for imperfections (ISO 10042:2005) EN ISO 11114-1, ! Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1: Metallic materials (ISO 11114-1)" EN ISO 11117:2008, Gas cylinders - Valve protection caps and valve guards - Design, construction and tests (ISO 11117:2008) EN 14784-1, BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) EN ISO 11363-1, Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-1) EN ISO 14731, Welding coordination - Tasks and responsibilities (ISO 14731:2006) ! EN ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for mechanized and automatic welding of metallic materials (ISO 14732)" EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules (ISO 15607) EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials - Welding procedure specification - Part 1: Arc welding (ISO 15609-1) EN ISO 15614-2, Specification and qualification of welding procedures for metallic materials - Welding procedure test - Part 2: Arc welding of aluminium and its alloys (ISO 15614-2) ! EN ISO 17636-1:2013, Non-destructive testing of welds — Radiographic testing — Part 1: X- and gamma-ray techniques with film (ISO 17636-1:2013) EN ISO 17636-2:2013, Non-destructive testing of welds - Radiographic testing - Part 2: X- and gamma-ray techniques with digital detectors (ISO 17636-2:2013)" EN ISO 17637, Non-destructive testing of welds - Visual testing of fusion-welded joints (ISO 17637) ! EN ISO 17639, Destructive tests on welds in metallic materialsMacroscopic and microscopic examination of welds (ISO 17639) EN ISO 19232-1, Non-destructive testing - Image quality of radiographs - Part 1: Determination of the image quality value using wire-type image quality indicators (ISO 19232-1) EN ISO 19232-2, Non-destructive testing - Image quality of radiographs - Part 2: Determination of the image quality value using step/hole-type image quality indicators (ISO 19232-2) " Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1.1 liquefied petroleum gas LPG low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011, UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane, butane isomers, butene with traces of other hydrocarbon gases 3.1.2 cylinder ! transportable pressure receptacle with a water capacity not exceeding 150 l " BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) 9.7.2 Inspection lots 9.7.2.1 For acceptance purposes, the production batch shall be divided into inspection lots not exceeding 000 cylinders 9.7.2.2 For selection of sample cylinders for either burst or mechanical tests, each lot is sub-divided into sub-lots of 250 cylinders during the first 000 cylinders of a production batch and sub-lots of 500 cylinders or lots of 000 cylinders, depending on the cylinder size, thereafter (see Figure 12) 9.7.3 Rate of sampling 9.7.3.1 General Where a production batch contains material from more than one cast, the manufacturer shall arrange for samples tested to represent each cast of material used The reduced rate of sampling for large volume manufacture (above 000 cylinders) can only be applied once the manufacturer can demonstrate that the batch production test results and manufacturing processes are consistently reliable, without any major interruption of manufacture ! " Except as permitted by 9.7.1 , the samples taken for “Burst tests or Mechanical tests” shall be alternated between the mechanical and the burst tests A chart illustrating the rate of sampling is given in Figure 12 9.7.3.2 Production batch less than or equal to 000 cylinders From the first 250 cylinders in each inspection lot, representative cylinders shall be taken at random, one for the burst test and one for mechanical tests From each subsequent group of 250 cylinders in the inspection lot, one representative cylinder shall be taken at random for either the burst test or mechanical tests 9.7.3.3 Production batch over 000 cylinders 9.7.3.3.1 Cylinders less than or equal to 35 l capacity For the first 000 cylinders in the production batch, representative cylinders shall be taken as specified in 9.7.3.2 For the remaining cylinders from each inspection lot (1 000 cylinders), representative cylinders shall be taken at random, one for the burst test and one for mechanical tests 9.7.3.3.2 Cylinders greater than 35 l capacity For the first 000 cylinders in the production batch, representative cylinders shall be taken as specified in 9.7.3.2 From the first 500 cylinders or less in each inspection lot remaining, representative cylinders shall be taken at random, one for the burst test and one for mechanical tests From the remaining 500 cylinders or less in such inspection lots, one representative cylinder shall be taken at random for either a burst test or mechanical tests 9.7.4 Additional checks The sample cylinders selected for mechanical tests shall also undergo the following checks: — dimensional and wall thickness checks to confirm compliance with the design; and 36 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) — tolerance checks to confirm compliance with 6.5 9.8 Failure to meet mechanical and burst test requirements 9.8.1 Mechanical 9.8.1.1 Where there is evidence of a fault in carrying out the mechanical tests, or of any error of measurement, a second test on the same cylinder shall be performed Where the result of this test is satisfactory, the first test shall be ignored 9.8.1.2 Where the second test confirms the initial test result, the procedure specified in 9.8.3.1 or 9.8.3.2 shall be followed 9.8.2 Burst In the event of a single cylinder failing the burst test, the procedure specified in 9.8.3.1 or 9.8.3.2 shall be followed 9.8.3 Production batch retest 9.8.3.1 In the event of a single cylinder failing either the mechanical or burst test, both mechanical and burst tests shall be made as shown in Table 6, the retest cylinders being taken at random from the same sub-lot Table — Production batch retest requirements Size of inspected sub-lot Failure Retest ≤ 250 1M 2M + 1B ≤ 250 1B 1M + 2B > 250 1M 2M + 2B > 250 1B M + 4B NOTE 9.8.3.2 M denotes mechanical test, B denotes burst test In the event that there is no failure from the retest, the batch shall be accepted 9.8.3.3 When more than one cylinder fails the initial tests or one or more cylinders fails the retest specified in 9.8.3.1, the batch shall be rejected 9.8.4 Resubmission of a production batch 9.8.4.1 For a rejected production batch, the cylinders shall be rectified and re-tested or be scrapped Scrapped cylinders shall be disposed of per EN 12816 9.8.4.2 Prior to any rectification, the cause of the defect shall be established 9.8.4.3 Recognized weld defects shall be repaired 9.8.4.4 The production batch shall be subject to a second heat treatment cycle 9.8.4.5 The rectified production batch shall be resubmitted as a new production batch for approval in accordance with 9.7 37 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) 9.8.4.6 Cylinders shall only be subjected to one rectification and re-heat treatment cycle 9.8.5 Weld repairs Individual cylinders rejected due to local weld imperfections can be repaired, re-heat treated and resubjected to the tests specified in 9.1.2 All repairs shall be carried out in accordance with a qualified weld procedure by qualified personnel (see Clause 6) 10 Marking 10.1 Each cylinder shall be marked clearly and legibly with certification, manufacturing and operational information in accordance with the requirements of the current version of RID/ADR and with EN 14894 The requirements of RID/ADR shall override conflicting requirements of EN 14894 NOTE EN 14894 will be regularly amended/revised to ensure its requirements comply with the latest version of RID/ADR 10.2 Where markings are applied by stamping or engraving onto the pressure parts of the cylinder, it shall be demonstrated in the fatigue and burst tests that failure does not initiate in the markings and that the markings remain legible 11 Certificate of Conformity In addition to the type approval certificate required by 8.3, each production batch of cylinders shall be covered by a certificate of conformity in accordance with the requirements of the current version of RID/ADR to the effect that the cylinders comply with the approved type and meet the requirements of the relevant issue of RID/ADR and of this European Standard in all respects 38 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Annex A (normative) Corrosion tests A.1 Test for assessing susceptibility to intercrystalline corrosion A.1.1 Specimens A.1.1.1 Specimens shall be taken from the cylindrical part and both ends of the cylinder so that the tests with the solution as defined in ⁠ A.1.3.2 ⁠ can be carried out on metal from parts of the cylinder A.1.1.2 Each specimen shall be of the general shape and dimensions indicated in Figure A.1 A.1.1.3 The surfaces, a1 a4b 4b and a2 a3 b b , which correspond respectively to the inner and outer faces of the cylinder, shall be left in the as-manufactured condition The remaining faces may be made smooth for handling purposes A.1.2 Pre-treatment of the specimen before corrosive etching A.1.2.1 Chemicals required The required chemicals are: — HNO analytical reagent grade, relative density 1,33; — HF analytical reagent grade, relative density 1,14 (at 40 % v/v solution); and — de-ionized water NOTE Consideration should be given to minimizing the environmental impact of the chemicals specified by including the possible recovery of test fluids, recycling of mechanical test specimens, safe disposal of chemicals etc A.1.2.2 Method A.1.2.2.1 HNO HF Prepare a solution A in a suitable container according to the following proportions: 63 ml/l ml/l H2O 931 ml/l A.1.2.2.2 Heat solution A to a temperature of (95 ± 2) °C A.1.2.2.3 Treat each specimen as follows: — suspend on an aluminium wire; — immerse in solution A for min; — remove from solution A and wash in running water and then in de-ionized water; 39 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) — immerse each specimen in HNO acid, as specified in ⁠ A.1.2.1 ⁠ , for at room temperature to remove any copper deposit which may have formed; and — remove from the HNO acid and rinse in de-ionized water A.1.2.2.4 To prevent oxidation, specimens shall be subjected to the corrosive etching process, specified in A.1.3 immediately on completion of this pre-treatment A.1.3 Corrosive etching process A.1.3.1 Chemicals required The required chemicals are: — NaCl, analytical reagent grade, crystallized; — H O , 100 to 110 volumes, medicinal grade; and — de-ionized water A.1.3.2 Method A.1.3.2.1 Prepare a solution B in a suitable container Each litre of solution shall contain the following: NaCl 57 g/l H2O2 g/l H2O Remainder A.1.3.2.2 Because H O is not stable, the purity shall be determined by titration and the quantity added shall be adjusted accordingly a) Maintain solution B at a temperature of (30 ± 1) °C for the duration of the test; b) The quantity of solution B used shall be a minimum of 10 ml/cm of specimen surface area; c) Treat each specimen as follows: — suspend on an aluminium wire, or place in solution B so that it rests on the corners and does not touch any other specimen; — immerse in solution B for h; — remove from solution B and wash in running water and then in de-ionized water; — immerse each specimen in dilute HNO acid (50 %), for 30 s; — remove from the dilute HNO acid and rinse in de-ionized water; — dry the specimen with air A.1.3.2.3 Several specimens can be etched at the same time provided that they are of the same type of alloy and that they are not in contact with each other The minimum quantity of solution B per unit of specimen surface shall be maintained 40 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) A.1.4 Preparation of specimens for examination A.1.4.1 Method Each specimen shall be encased in an appropriate mounting resin so that face a a a a can be machined The mounted specimen shall be machined so that a minimum of mm is removed from face a a a a 4, to expose section a´1 a´ a´ a´4 (see Figures A.1 and A.2) The exposed section a´ a´ a´ a´4 shall be polished to permit micrographic examination A.1.5 Micrographic examination of specimens The polished face of the specimen shall be examined under a microscope, at a minimum of × 300 magnification, to determine the extent of intercrystalline corrosion from the faces which represent the as-manufactured inside and outside surfaces of the cylinder NOTE areas The section can first be examined at low magnification (e.g × 40) in order to locate the most corroded A.1.6 Interpretation of the micrographic examination Intergranular corrosion is considered superficial where the following conditions are satisfied: a) For alloys with equiaxed crystallization, the depth of corrosion round the entire perimeter of the section shall not exceed the higher of the following values: 1) grains in the direction perpendicular to the face examined; or 2) 0,2 mm However, it is permissible for these values to be exceeded locally, provided that they are not exceeded in more than fields of examination at × 300 magnification b) For alloys with crystallization set in one direction through cold working, the depth of the corrosion into each of the faces that make up the internal and external surfaces of the cylinder shall not exceed 0,1 mm A.2 Tests for assessing susceptibility to stress corrosion A.2.1 Specimens Three rings with a width of a or 25 mm, whichever is the greater, shall be cut from the cylindrical part of the cylinder The rings shall have a 60° section cut out and shall be subjected to stress by means of a threaded bolt and two nuts (see Figure A.3) A.2.2 Surface preparation before test All traces of grease, oil and adhesive used with strain gauges (see A.2.3.2.3) shall be removed with a suitable solvent NOTE Oily or contaminated rags should be disposed of in an environmentally friendly fashion 41 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Dimension in millimetres Key cylinder wall thickness Figure A.1 — Etching specimen A.2.3 Method A.2.3.1 Preparation of the corrosive solution A.2.3.1.1 Solution C shall be prepared by dissolving (3,5 ± 0,1) parts NaCl in 96,5 parts of distilled water, by mass A.2.3.1.2 The pH value of freshly prepared solution C shall be in the range 6,4 to 7,2 A.2.3.1.3 The pH of solution C may be initially corrected by using dilute HCl or dilute NaOH, to bring it into the range 6,4 to 7,2 A.2.3.1.4 Once prepared, solution C shall not be topped up by adding the salt solution described in A.2.3.1.1 but only by the addition of distilled water up to the initial level in the vessel Topping up shall be carried out daily as necessary to ensure that the specimens are fully immersed throughout the test A.2.3.1.5 42 Solution C shall be replaced every days BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Key casting dish resin matrix cylinder specimen Figure A.2 — Polished specimen 43 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Key threaded bolt insulating washer with sleeve nut 4 a or 25 mm whichever is greater ring specimen Figure A.3 — Stress specimen A.2.3.2 Applying the stress to the specimen A.2.3.2.1 The specimen shall be compressed so the outer surface is under tension A.2.3.2.2 The amount of stress applied shall be: Reg 1,3 44 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) A.2.3.2.3 formula: The actual stress shall be measured by strain gauges or calculated from the following f = EaZ (D − 2D ) π (D − a ) ' where a calculated minimum thickness of the cylindrical part, in mm; D outside diameter of the cylinder as given in the design drawing, in mm (see Figure 1); D' diameter of the ring when compressed, in mm; f actual stress applied, in N/mm ; E modulus of elasticity, in N/mm ; Z correction factor (see Figure A.4) A.2.3.2.4 The nuts and bolts used to tension the specimens shall be electrically insulated from the specimens and protected from corrosion by the solution A.2.3.2.5 The specimens shall be immersed in solution C for 10 and then removed and exposed to the air for 50 A.2.3.2.6 This cycle shall be repeated continuously for 30 days or until the specimen breaks, whichever occurs first A.2.3.2.7 The specimens shall be inspected visually for any cracks 45 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Figure A.4 — Correction factor Z A.2.4 Interpretation of the results The resistance to stress corrosion shall be considered to be acceptable if none of the specimens subjected to the test breaks, or develops any cracks visible to the naked eye, or visible at low magnification ( × 10 to × 30), at the end of the test (after 30 days) A.2.5 Metallographical examination (additional examination) A.2.5.1 In the event of doubt about the presence of cracks (e.g line of pitting), additional metallographic examination of a section taken of the specimen in the suspect area shall be carried out A comparison shall be made of the form (intercrystalline or transcrystalline) and depth of penetration of the corrosion on the faces of the specimen subject to tensile and compressive stresses A.2.5.2 !" The resistance to stress corrosion shall be considered acceptable if the corrosion of both faces of the ring is similar Where the face of the ring subject to tensile stress reveals cracks, which are clearly deeper than those on the face subject to compressive stress, the resistance to stress corrosion shall be deemed not acceptable A.3 Conclusion of corrosion tests Materials that pass both sets of corrosion tests carried out in accordance with A.1 and A.2, shall be considered to have satisfied 4.3 A.4 Test report On conclusion of the test, a report shall be prepared giving the following information: 46 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) a) the name of the material/alloy and/or its standard number; b) the chemical composition including limits; c) the actual analysis of the cast from which the cylinders were manufactured; d) the actual mechanical properties of the material/alloy and the minimum mechanical properties required; e) the results of the tests ! Annex B deleted " 47 BS EN 13110:2012+A1:2017 EN 13110:2012+A1:2017 (E) Bibliography [1] [2] [3] [4] [5] [6] [7] [8] ! Aluminium and aluminium alloys - Chemical composition and form ofwrought products - Part 3: Chemical composition and form ofproducts" ! CEN/TS 16765, LPG equipment and accessories — Environmental considerations for CEN/TC 286 standards" EN ISO 13341, Gas cylinders - Fitting of valves to gas cylinders (ISO 13341) EN ISO 14021, Environmental labels and declarations - Self-declared environmental claims (Type II environmental labelling) (ISO 14021) EN ISO 14024, Environmental labels and declarations - Type I environmental labelling - Principles and procedures (ISO 14024) EN ISO 14025, Environmental labels and declarations - Type III environmental declarations Principles and procedures (ISO 14025) EN ISO 14245, Gas cylinders - Specifications and testing of LPG cylinder valves - Self-closing (ISO 14245) EN ISO 15995, Gas cylinders - Specifications and testing of LPG cylinder valves - Manually operated (ISO 15995) EN 573-3, [9] ADR, European Agreement concerning the International Carriage of Dangerous goods by Road [10] RID, Regulations concerning the International Carriage of Dangerous Goods by Rail [11] Directive 2010/35/EU of the European Parliament and of the Council of 16 June 2010 on transportable pressure equipment [12] Measurement uncertainty leaflet (SP INFO 2000 27 uncertainty pdf), Magnus Holmgren et al, published by Swedish National Testing and Research Institute 48 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 content from BSI publications contact the BSI Copyright & Licensing team The knowledge embodied in our standards 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