SIST EN 14638-3:2010
(Main)Transportable gas cylinders - Refillable welded receptacles of a capacity not exceeding 150 litres - Part 3: Welded carbon steel cylinders made to a design justified by experimental methods
Transportable gas cylinders - Refillable welded receptacles of a capacity not exceeding 150 litres - Part 3: Welded carbon steel cylinders made to a design justified by experimental methods
This European Standard gives minimum requirements concerning material, design, construction and workmanship, procedures and tests at manufacture of refillable transportable welded cylinders made of carbon steel, justified by experimental methods, of water capacities from 0,5 l up to and including 150 l for compressed or liquefied gases and of a test pressure up to 90 bar.
Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Gefäße mit einem Fassungsraum von nicht mehr als 150 Liter - Teil 3: Flaschen aus geschweißtem Kohlenstoffstahl, ausgelegt nach experimentellen Verfahren
Diese Europäische Norm legt Mindestanforderungen an Werkstoff, Auslegung, Bau und Ausführung, Herstellungsverfahren und Herstellungsprüfungen von wiederbefüllbaren ortsbeweglichen, geschweißten Flaschen aus Kohlenstoffstahl, ausgelegt nach experimentellen Verfahren, mit einem Fassungs¬raum von 0,5 l bis einschließlich 150 l für verdichtete und verflüssigte Gase mit einem Prüfdruck bis zu 90 bar fest.
ANMERKUNG Diese Norm kann auch als Leitfaden für Flaschen mit einem Fassungsraum von weniger als 0,5 l angewendet werden.
Diese Europäische Norm gilt hauptsächlich für andere Industriegase als Flüssiggas (englen.: Liquified Petroleum Gas - LPG), kann jedoch ebenfalls für LPG angewendet werden. Für zugehörige LPG-Flaschen siehe hingegen EN 14140 [5], die vom CEN/TC 286 -Flüssiggas-Geräte und Ausrüstungsteile erarbeitet wurde.
Bouteilles à gaz transportables - Récipients soudés rechargeables d'une capacité inférieure ou égale à 150 litres - Partie 3 : Bouteilles en acier carbone soudées conçues par des méthodes expérimentales
La présente Norme européenne spécifie les exigences minimales relatives au matériau, à la conception, à la construction et à la mise en œuvre, aux modes de fabrication et aux essais lors de la fabrication des bouteilles transportables rechargeables, en acier au carbone soudées, conçues par des méthodes expérimentales, de capacités équivalentes en eau comprises entre 0,5 l et 150 l inclus, destinées aux gaz comprimés ou liquéfiés et soumises à une pression d’épreuve maximale de 90 bar.
NOTE La présente Norme européenne peut également servir de guide en matière de bouteilles de capacité équivalente en eau inférieure à 0,5 l.
La présente Norme européenne s’applique principalement aux gaz industriels autres que le gaz de pétrole liquéfié (GPL) mais peut également concerner le GPL. Toutefois, pour les bouteilles à gaz réservées au GPL, voir l’EN 14140 [5], préparée par le CEN/TC 286 Équipements pour GPL et leurs accessoires.
Premične plinske jeklenke - Ponovno polnljivi varjeni vsebniki s prostornino, ne večjo kot 150 litrov - 3. del: Varjene jeklenke iz ogljičnega jekla, izdelane po konstrukciji, potrjeni s preskušanjem
Ta evropski standard opredeljuje minimalne zahteve glede materiala, zasnove, izgradnje in strokovnosti, postopkov in preskusov pri proizvodnji ponovno polnljivih prenosnih varjenih jeklenk iz ogljičnega jekla, potrjenih s preskušanjem, s prostornino od 0,5 l do in vključno 150 l, za stisnjene ali utekočinjene pline in s preskusnim tlakom do 90 barov.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Gefäße mit einem Fassungsraum von nicht mehr als 150 Liter - Teil 3: Flaschen aus geschweißtem Kohlenstoffstahl, ausgelegt nach experimentellen VerfahrenBouteilles à gaz transportables - Récipients soudés rechargeables d'une capacité inférieure ou égale à 150 litres - Partie 3 : Bouteilles en acier carbone soudées conçues par des méthodes expérimentalesTransportable gas cylinders - Refillable welded receptacles of a capacity not exceeding 150 litres - Part 3: Welded carbon steel cylinders made to a design justified by experimental methods23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 14638-3:2010SIST EN 14638-3:2010en,fr,de01-november-2010SIST EN 14638-3:2010SLOVENSKI
STANDARD
SIST EN 14638-3:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14638-3
August 2010 ICS 23.020.30 English Version
Transportable gas cylinders - Refillable welded receptacles of a capacity not exceeding 150 litres - Part 3: Welded carbon steel cylinders made to a design justified by experimental methods
Bouteilles à gaz transportables - Récipients soudés rechargeables d'une capacité inférieure ou égale à 150 litres - Partie 3: Bouteilles en acier carbone soudées conçues par des méthodes expérimentales
Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Gefäße mit einem Fassungsraum von nicht mehr als 150 Liter - Teil 3: Flaschen aus geschweißtem Kohlenstoffstahl, ausgelegt nach experimentellen VerfahrenThis European Standard was approved by CEN on 23 July 2010.
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 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 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 and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14638-3:2010: ESIST EN 14638-3:2010
EN 14638-3:2010 (E) 2 Contents Page Foreword . 3Introduction . 41Scope . 52Normative references . 53Terms, definitions and symbols . 64Materials and heat treatment . 85Design . 96Construction and workmanship . 107Type approval procedure . 148Production tests . 189Marking . 27Annex A (normative)
Non-destructive examination (NDE) of welds . 28Annex B (normative)
Description, evaluation of manufacturing imperfections and conditions for rejection of welded carbon steel gas cylinders at time of final visual inspection by the manufacturer . 30Annex C (informative)
Certificate of conformity . 33Annex D (normative)
Specific requirements for cylinders manufactured with steel that has an elongation less than 14 % . 36Annex E (informative)
Type approval certificate . 38Bibliography . 39 SIST EN 14638-3:2010
EN 14638-3:2010 (E) 3 Foreword This document (EN 14638-3:2010) has been prepared by Technical Committee CEN/TC 23 “Transportable gas cylinders”, the secretariat of which is held by BSI. 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 February 2011 and conflicting national standards shall be withdrawn at the latest by February 2011. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports the objectives of the framework Directives on Transport of Dangerous Goods [1] and [2]. This European Standard has been submitted for reference into the RID [3] and/or in the technical annexes of the ADR [4]. 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. 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 and United Kingdom.
SIST EN 14638-3:2010
EN 14638-3:2010 (E) 4
Introduction The purpose of this European Standard is to provide a specification for the design, manufacture, inspection and approval of welded carbon steel gas cylinders for use in the countries of the CEN members. The specifications given in the present standard establish the methodology to be adopted to demonstrate that a cylinder conforms to the functional requirements demanded, based on experience of materials, design prescriptions, manufacturing processes and controls manufacturing. This European Standard specifies experimental methods and appropriate stress analysis calculations. It does not cover methods exclusively by means of traditional calculation. SIST EN 14638-3:2010
EN 14638-3:2010 (E) 5
1 Scope This European Standard specifies minimum requirements concerning material, design, construction and workmanship, procedures and tests at manufacture of refillable transportable welded cylinders made of carbon steel, justified by experimental methods, of water capacities from 0,5 l up to and including 150 l for compressed or liquefied gases and of a test pressure up to 90 bar. NOTE This European Standard may also be used as a guideline for cylinders less than 0,5 l water capacity. This European Standard is primarily intended for industrial gases other than LPG but may also be applied for LPG. However, for dedicated LPG cylinders see EN 14140 [5], prepared by CEN/TC 286. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 287-1, Approval testing of welders — Fusion welding — Part 1: Steels EN 462-1, Non-destructive testing — Image quality of radiographs — Part 1: Image quality indicators (wire type) — Determination of image quality value EN 462-2, Non-destructive testing — Image quality of radiographs — Part 2: Image quality indicators (step/hole type) — Determination of image quality value EN 473:2008, Non-destructive testing — Qualification and certification of NDT personnel — General principles EN 910, Destructive tests on welds in metallic materials — Bend tests EN 970, Non-destructive examination of fusion welds — Visual examination EN 1418, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials EN 1435:1997, Non destructive examination of welds — Radiographic examination of welded joints EN 1803, Transportable gas cylinders — Periodic inspection and testing of welded carbon steel gas cylinders EN 10028-1, Flat products made of steels for pressure purposes — Part 1: General requirements EN 10028-3, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized EN 10028-5, Flat products made of steels for pressure purposes — Part 5: Weldable fine grain steels, thermomechanically rolled EN 10045-1, Metallic materials — Charpy impact test — Part1: Test method EN 10052, Vocabulary of heat treatment terms for ferrous products EN 10083-1, Steels for quenching and tempering — Part1: General technical delivery conditions SIST EN 14638-3:2010
EN 14638-3:2010 (E) 6 EN 10084, Case hardening steels — Technical delivery conditions EN 10120, Steel sheet and strip for welded gas cylinders EN 10268, Cold rolled steel flat products with high yield strength for cold forming — Technical delivery conditions EN 14784-1, 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 ISO 5817, 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 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1:2009) EN ISO 10692-2, Gas cylinders — Gas cylinder valve connections for use in the microelectronics industry — Part 2: Specification and type testing for valve to cylinder connections (ISO 10692-2:2001) EN ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials (ISO 11114-1:1997) EN ISO 11117:2008, Gas cylinders — Valve protection caps and valve guards — Design, construction and tests (ISO 11117:2008) EN ISO 15614-1, 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) ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method 3 Terms, definitions and symbols 3.1 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1.1 yield strength stress value corresponding to the lower yield strength, ReL, or 0,92 × the upper yield strength, ReH, or for steels that do not exhibit a lower (ReL) and an upper (ReH) yield strength (sometimes named “lower and upper yield point” at tensile testing, the 0,2 % proof strength Rp0,2 3.1.2 normalizing heat treatment in which the steel is heated to a uniform temperature above the upper critical point (Ac3) of the steel and then cooled in still air or in a controlled atmosphere 3.1.3 stress relieving heat treatment given to the finished cylinder, the object of which is to reduce the residual stresses without altering the metallurgical structure of the steel, by heating to a uniform temperature below the critical point (Ac1, as defined in EN 10052) of the steel and cooling in a still atmosphere SIST EN 14638-3:2010
EN 14638-3:2010 (E) 7 3.1.4 parent material material corresponding to the cylinder after finishing its manufacturing process and ready for service/operation NOTE The material characteristics may be variable at any point of the cylinder. 3.1.5 batch finished cylinders made consecutively during the same or consecutive days to the same design, size and material specifications and from the same material supplier for each pressure containing parts on the same automatic welding machines and, if applicable, heat-treated under the same conditions of temperature and duration NOTE 1 In this context consecutively need not imply continuous production. NOTE 2 This definition allows different suppliers to be used for the different pressure containing parts within a batch, e.g. one supplier for heads, another for bases. 3.1.6 cylinder transportable pressure receptacle of a water capacity not exceeding 150 l 3.1.7 finished cylinder cylinder which is fully assembled and appropriately stamp marked, but without any external coatings 3.1.8 cold forming final deformation treatment at ambient temperature given to the prefabricated cylinder, known as the preform, which results in a permanent increase in the material strength and a permanent decrease in elongation 3.1.9 valve boss or pad connection between valve and cylinder 3.2 Symbols a
Minimum thickness, in millimetres, for calculation of weld clearance (see Figure 1) asi Calculated minimum thickness, in millimetres, at a determined area “i” of the cylinder abi Minimum thickness, in millimetres, at a determined area “i” of the cylinder (including any corrosion allowance) guaranteed by the manufacturer Ai Percentage elongation after fracture, at a determined area “i” of the cylinder i Area of the cylinder used
for the calculation under consideration L Original gauge length, in millimetres, in accordance with EN 10002-1 n Ratio of diameter of bend test former to the thickness of the test piece ph Test pressure, in bar, above atmospheric pressure pb Minimum burst pressure, in bar SIST EN 14638-3:2010
EN 14638-3:2010 (E) 8 pba
Actual burst pressure, in bar ReH
Upper yield strength, in MPa ReL
Lower yield strength, in MPa Rp0,2
0,2 % proof strength, in MPa Rpi0,2 Minimum value of 0,2 % proof strength in MPa, guaranteed by the cylinder manufacturer for the finished cylinder, at a determined area “i” of the cylinder Rmgi
Minimum guaranteed value of tensile strength, in MPa, for the finished cylinder, at a determined area “i” of the cylinder Rmai Actual value of tensile strength, in MPa, at a determined area “i” of the cylinder Regi Minimum guaranteed value of the yield strength (see 3.1.1), in MPa, for the finished cylinder, at a determined area “i” of the cylinder Reai
Actual value of yield strength, in MPa, at a determined area “i” of the cylinder s
Nominal butt weld thickness 4 Materials and heat treatment 4.1 General 4.1.1 The cylinder materials subject to pressure shall conform to EN 10028-1 and EN 10028-3, or
EN 10028-1 and EN 10028-5, or EN 10120 or EN 10268 or other carbon steel standards, provided that they satisfy the requirements of this European Standard. NOTE These materials correspond to the materials received by the manufacturer, before having been submitted to any manufacturing process. 4.1.2 Materials supplied for boss shall conform to EN 10083-1 or EN 10084. 4.1.3 The welding consumables shall be such that they are capable of giving consistent welds. The material characteristics on the welds shall be considered by design. 4.1.4 Grades of steel used for the cylinder manufacture shall be compatible with the intended gas service, e.g. corrosive gases, embrittling gases according to EN ISO 11114-1. 4.1.5 The manufacturer shall be able to guarantee cylinder steel casting traceability for each pressure retaining part. 4.1.6 All parts welded or in contact with the cylinder shall be made of compatible material with the cylinder without harming its characteristics or favouring corrosion processes. 4.1.7 The cylinder manufacturer shall obtain and provide certificates of the ladle analysis of the steel supplied for the construction of the pressure retaining parts of the cylinder and of welding consumables. 4.2 Heat treatment When the manufacturer considers that heat treatment is necessary, it should be in accordance with EN 10052. When no heat treatment is performed, because there is a risk of strain ageing, especially for SIST EN 14638-3:2010
EN 14638-3:2010 (E) 9 cylinders which experience deep drawing, the manufacturer shall demonstrate that there is no risk of deterioration in the properties of the cylinder over its expected lifetime, e.g. by performing cycling tests at temperatures up to 100 °C and verifying that the mechanical properties are at least above the minimum specified (see 8.1.3.2), tensile testing after holding samples at up to 100 °C for 60 h, etc. 4.3 Test requirements The material of the finished cylinders shall conform to Clause 7. 4.4 Failure to meet test requirements 4.4.1 In the event of failure to meet test requirements, retesting shall be carried out as given in 4.4.2 and 4.4.3. 4.4.2 If there is evidence of a fault in carrying out a test or an error of measurement, a further test shall be performed. If the result of the retest is satisfactory, the first test shall be ignored. 4.4.3 If the test has been carried out in a satisfactory manner, the cause of test failure shall be identified, as follows: if the failure is considered to be due to inappropriate heat treatment (if applied), the manufacturer may subject all the cylinders of the batch to a further heat treatment; if the failure is not due to inappropriate heat treatment (if applied), all the identified faulty cylinders shall be rejected or repaired by an approved method. The remaining cylinders are then considered as a new batch. In both cases the new batch shall be tested. All the relevant prototype or batch tests needed to prove the acceptability of the new batch, shall be performed again and shall satisfy the requirements for batch or prototype testing. If one or more tests prove even partially unsatisfactory, all the cylinders of the batch shall be rejected. 5 Design 5.1 General For any new design, the concepts outlined in 5.2 and 5.3 shall be followed. It is recommended that an approximate calculation for the initial design is made. This initial calculated design may then be optimized if results from the experimental method exceed the minimum requirements. 5.2 Calculation Where a calculation is to be used as the basis for the design, the following conditions shall be considered: the calculation of the wall thickness of the pressure containing parts “i” shall be related to the guaranteed yield strength of the material, of the finished product in each area “i” to be considered; for calculation purposes, the value of the guaranteed yield strength Reai, is limited to a maximum of 0,85 Rmgi; the internal pressure upon which the calculation of gas cylinders is based, shall be the test pressure ph. SIST EN 14638-3:2010
EN 14638-3:2010 (E) 10 At the test pressure, the stress in the metal at the most severely stressed point of the cylinder shall not exceed 77 % of the guaranteed yield strength (Regi). This can be verified by, for example, studying the stress analysis. 5.3 Experimental method An experimental method shall be used as the basis for the design. The following conditions shall be met: the actual wall thickness, mechanical properties and the geometry of the cylinders submitted to the prototype tests shall be recorded. The actual thickness of the prototype cylinder shall be not more than the minimum guaranteed thickness plus 5 %. the manufacturer shall take into account the requirements of 7.1.2 and ensure that the properties recorded represent the minimum values that would be used for production. 5.4 Openings Each opening in the cylinder shall be reinforced, either by a valve boss or pad, of weldable and compatible steel, securely attached by welding and so designed as to be of adequate strength and to result in no harmful stress concentrations. This shall be confirmed by prototype testing. Openings shall be clear of longitudinal and circumferential joints by a distance not less than 3a (see Figure 1). 6 Construction and workmanship 6.1 Manufacturing methods 6.1.1 The essential characteristics of the manufacturing processes applied and the corresponding parameters shall be defined in the technical specification of the cylinder (see 7.1.1). 6.1.2 The manufacturer shall have the technical capability, have at his disposal all appropriate means, and qualified personnel to carry out the manufacture of cylinders. NOTE The Regulations [1 - 4] require that quality assurance system applied by the manufacturer shall conform to the requirements of the competent authority and that the manufacturing process is subject to a survey by the relevant body. SIST EN 14638-3:2010
EN 14638-3:2010 (E) 11
Figure 1 — Weld clearance 6.2 Welding procedures Each manufacturer, before proceeding with the production of a given design of cylinder, shall qualify the welding procedures and welders according to EN ISO 15614-1 and EN 287-1 or EN 1418. Records of such qualification shall be kept on file by the manufacturer. 6.3 Pressure-retaining welded joints Except for the boss weldments, all welded joints shall be either of a butt or a joggle configuration (see Figure 2). For cylindrical shapes, longitudinal joints shall be butt welded. 6.4 Non-pressure-containing attachments 6.4.1 Non-pressure-containing parts such as footrings, handles and neckrings which are not submitted to pressure shall be made in accordance with 4.1.6. 6.4.2 Each attachment shall be designed to permit inspection of the welds, which shall be clear of longitudinal and circumferential joints, and so designed as to avoid trapping water. 6.4.3 A footring or other suitable supports shall be fitted when applicable to the cylinder to provide stability, and attached so as to permit inspection of the welds. The footring, if attached, shall have drainage and the space enclosed by the footring shall be ventilated. 6.4.4 In the case of cylinders subjected to a cold-forming, the non-pressure retaining attachments shall be welded to the cylinder preform before cold forming or cryoforming. 6.5 Valve protection 6.5.1 Valves of cylinders of more than 5 l water capacity shall be effectively protected from damage that could cause release of gas, either by the design of the cylinder (for example protective shroud) or by a valve protection device (see EN ISO 11117). 6.5.2 When a protective shroud is used, it shall fulfil the requirements of the drop test (see
EN ISO 11117).
Key 1 longitudinal joint
Key 2 circumferential joint a) b) SIST EN 14638-3:2010
EN 14638-3:2010 (E) 12 6.5.3 The requirements of 6.5.1 and 6.5.2 may be waived when the cylinders are used and conveyed in bundles or cradles, or when some other effective valve protection is provided, for example a self-protected valve or when the cylinder is inside a protective box. 6.6 Cylinder openings 6.6.1 Standard openings Cylinder openings shall conform to a recognized standard agreed between the parties to permit the use of a corresponding valve thus minimizing neck stresses following the valve torquing operation. Internal neck threads shall be checked using gauges corresponding to the agreed neck thread, or by an alternative method agreed between the parties. NOTE For example, where the neck thread is specified to be in accordance with EN ISO 11363-1, the corresponding gauges are specified in EN ISO 11363-2. Particular care shall be taken to ensure that neck threads are accurately cut, are of full form and free from any sharp profiles, e.g. burrs. 6.6.2 Special openings If a special valve/cylinder connection is used (e.g. flanges), it shall be checked that it conforms to the testing requirements of EN ISO 10692-2. 6.7 Visual examination 6.7.1 Unacceptable imperfections Before assembly, the pressure containing parts of the cylinder shall be examined for uniform quality and freedom from unacceptable imperfections (see Annex B). 6.7.2 Welds 6.7.2.1 Before the cylinders are closed, wherever possible, the welds shall be visually examined from both sides as described in 6.7.2.2 and 6.7.2.3. Permanent backing strips shall not be used with longitudinal welds. 6.7.2.2 All welds shall have a smooth finish without concavity and shall merge into the parent material without under-cutting or abrupt irregularity. 6.7.2.3 Butt welds shall have full penetration. For joggle welds, the penetration shall be full on the straight edge and shall be sufficient on the swaged edge (see Figure 2). SIST EN 14638-3:2010
EN 14638-3:2010 (E) 13 Dimensions in millimetres
a) Butt welds
b) Joggle welds Figure 2 — Illustration of welding penetration 6.7.2.4 Radiographic examination, or radioscopic examination, or NDT examination carried out using another suitable method shall be as specified in Annex A. 6.8 Dimensional tolerances 6.8.1 General The dimensional tolerances shall conform to the approved design drawing. In addition the following (6.8.2 to 6.8.4) shall apply for cylindrical shapes. 6.8.2 Out-of-roundness The out-of-roundness of the cylindrical shell shall be limited so that the difference between the maximum and the minimum outside diameter in the same cross-section is not more than 2 % of the mean of these diameters. 6.8.3 Straightness Unless otherwise agreed by the parties, the maximum deviation of the cylindrical part of the shell from a straight line shall not exceed 0,3 % of the cylindrical length. Unless otherwise specified on the manufacturing drawing, the maximum deviation of the cylindrical part of the shell from a straight line shall not exceed 0,3 % of the cylindrical length. 6.8.4 Verticality When the cylinder is standing on its base, the cylindrical shell and top valve openings shall be vertical to within 1 % of the cylindrical length. SIST EN 14638-3:2010
EN 14638-3:2010 (E) 14 6.9 Stability If the cylinder is designed to be free standing when resting on its base, the projected centre of gravity of the cylinder shall be such that it remains approximately within the outline of the base ring, in order to ensure adequate stability. 6.10 Tightness Tests appropriate to the manufacturing process shall be carried out to ensure that there is no leakage from the cylinder in accordance with 8.2.2. 7 Type approval procedure 7.1 General requirements 7.1.1 General A technical specification of the cylinder (or cylinder family), including design drawing, design calculation where appropriate, thicknesses and tolerances, specification for tests (including the leak test), material details and minimum guaranteed impact energy, welding and manufacturing process and heat treatment, shall be made available by the manufacturer. NOTE Cylinders built according to this standard are subject to the conformity assessment system outlined in the Regulations [1 - 4], consisting of type approval, supervision of manufacture and initial inspection and test. The bodies taking responsibility for these activities are the competent authority of the country of approval, who may delegate its functions in whole or in parts and inspection bodies approved by the competent authority. 7.1.2 New designs A cylinder shall be considered to be of a new design compared with an existing approved design when one of the following applies: it is manufactured in a different factory; it is manufactured by a different welding or manufacturing process or a radical change in an existing process, e.g. change in heat treatment; it is manufactured from a steel of different specified composition range; there is a change in shape or curvature of the determined areas “i”; the guaranteed minimum yield strength (Regi) and/or minimum tensile strength (Rmgi), and/or minimum elongation after fracture (Ai) has been changed; the water capacity or gross weight have been increased; the guaranteed wall thickness have been decreased; the hydraulic test pressure has been changed (where the cylinder is to be used for a lower pressure duty from that approved at the design approval stage, it shall not be deemed a new design). SIST EN 14638-3:2010
EN 14638-3:2010 (E) 15 7.1.3 Cylindrical walled cylinders For cylinders with cylindrical walls there is no need to repeat prototype testing for a family of cylinders, with the same diameter and shape, when the length of the cylindrical part of the cylinder has been reduced from the length of the prototype cylinder. 7.1.4 Valve protection Changes in the method of valve protection are not considered to be a design change; on
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