EN 12493:2013

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte Druckbehälter aus Stahl für Straßentankfahrzeuge für Flüssiggas (LPG) - Auslegung und HerstellungÉquipements pour GPL et leurs accessoires - Réservoirs sous pression en acier soudés des camions-citernes pour GPL - Conception et constructionLPG equipment and accessories - Welded steel pressure vessels for LPG road tankers - Design and manufacture43.080.10Tovornjaki in priklopnikiTrucks and trailers23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 12493:2013SIST EN 12493:2013en,fr,de01-december-2013SIST EN 12493:2013SLOVENSKI
STANDARDSIST EN 12493:2008+A1:20121DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12493
November 2013 ICS 23.020.30 Supersedes EN 12493:2008+A1:2012English Version
LPG equipment and accessories - Welded steel pressure vessels for LPG road tankers - Design and manufacture
Équipements pour GPL et leurs accessoires - Réservoirs sous pression en acier soudés des camions-citernes pour GPL - Conception et construction
Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte Druckbehälter aus Stahl für Straßentankfahrzeuge für Flüssiggas (LPG) - Auslegung und Herstellung This European Standard was approved by CEN on 15 August 2013.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12493:2013: ESIST EN 12493:2013

Guidance on selection of material grades . 25 Annex B (normative)
Reference temperatures for design . 26 B.1 Introduction . 26 B.2 General . 26 B.3 Developed pressure . 26 B.4 Filling . 26 Annex C (informative)
Alternative reference temperatures for design . 27 C.1 Introduction . 27 C.2 General . 27 C.3 Developed pressure . 27 C.4 Filling . 27 Annex D (normative)
Design . 28 D.1 Design stresses . 28 D.2 Design pressure . 28 D.3 Design formulae . 28 D.3.1 Cylindrical shell calculation . 28 SIST EN 12493:2013

Example of joints. 43 Annex F (normative)
Allowable tolerances . 47 F.1 Pressure vessels. 47 F.1.1 External diameter . 47 F.1.2 Out of roundness . 47 F.1.3 Deviation of straightness . 47 F.1.4 Irregularities in profile . 48 F.2 Dished end tolerance . 48 F.2.1 Thickness of material . 48 F.2.2 Profile . 48 F.3 Assembly tolerances . 50 F.3.1 Middle line alignment . 50 F.3.2 Surface alignment . 50 F.4 Attachments, nozzles and fittings . 50 F.5 Overall length . 50 Annex G (normative)
Heat treatment . 51 G.1 Method of post-weld heat treatment . 51 G.2 Temperature control . 51 G.3 Temperature limit . 51 G.4 Temperature measurement . 51 Annex H (informative)
Typical method for measurement of shell peaking . 52 H.1 Profile gauge . 52 H.2 Peaking survey . 52 Annex I (normative)
Welding imperfections and test specimens . 55 I.1 Imperfections . 55 I.2 Test specimens . 58 Annex J (informative)
Choice of non-destructive test methods for welds . 59 J.1 Internal imperfections . 59 J.2 Surface imperfections . 59 Annex K (normative)
Hydraulic pressure test . 60 K.1 Temporary fittings . 60 K.2 Pressure gauges . 60 K.3 Pressurizing agent . 60 K.4 Avoidance of shock . 60 K.5 Applied pressure. 60 Annex L (informative)
Environmental checklist . 61 Bibliography . 62
EN ISO 14000 series (see [6], [7] and [8]). 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 might be beneficial to refer to the leaflet “measurement uncertainty leaflet" SP INFO 2000 27 [13].
2 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 287-1, Qualification test of welders — Fusion welding — Part 1: Steels EN 444, Non-destructive testing — General principles for radiographic examination of metallic materials by X- and gamma-rays EN 462-1, Non-destructive testing — Image quality of radiographs — Part 1: Image quality indicators (wire type) — Determination of image quality value EN 837-2, Pressure gauges — Part 2: Selection and installation recommendations for pressure gauges EN 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy structural steels EN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specified elevated temperature properties EN 10028-3, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized EN 10204:2004, Metallic materials — Types of inspection documents EN 12252, LPG equipment and accessories — Equipping of LPG road tankers EN 13445-2, Unfired pressure vessels — Part 2: Materials EN 13445-3, Unfired pressure vessels — Part 3: Design EN 14717, Welding and allied processes — Environmental check list EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
(ISO 148-1) EN ISO 3452-1, Non-destructive testing — Penetrant testing — Part 1: General principles (ISO 3452-1) SIST EN 12493:2013

(ISO 6892-1) EN ISO 9016, Destructive tests on welds in metallic materials — Impact tests — Test specimen location, notch orientation and examination (ISO 9016) EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712) 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 15609-1, Specification and qualification of welding procedures for metallic materials — Welding procedure specification — Part 1: Arc welding (ISO 15609-1)
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) EN ISO 17636-1, Non-destructive testing of welds — Radiographic testing — Part 1: X- and gamma-ray techniques with film (ISO 17636-1) EN ISO 17636-2, Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray techniques with digital detectors (ISO 17636-2) EN ISO 17637, Non-destructive testing of welds — Visual testing of fusion-welded joints (ISO 17637) EN ISO 17638, Non-destructive testing of welds — Magnetic particle testing (ISO 17638) EN ISO 17639, Destructive tests on welds in metallic materials — Macroscopic and microscopic examination of welds (ISO 17639) EN ISO 17640, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and assessment (ISO 17640) 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) SIST EN 12493:2013

3.8 inspection body independent inspection and testing body approved by the competent authority
3.9 competent person person which by combination of appropriate qualification, training, experience, and resources, is able to make objective judgments on the subject 4 Materials 4.1 Environmental The manufacturer shall endeavour to acquire materials and components from suppliers who have a declared environmental policy, see EN ISO 14021, EN ISO 14024 and EN ISO 14025. SIST EN 12493:2013

4.2.2 The materials of construction shall be suitable for operating within the envisaged temperature range. If the pressure vessel could be subjected to more severe lower ambient or product temperatures, the design temperature range shall be -40 °C to +50 °C. 4.2.3 Guidance on selection of material grades is given in Annex A. 4.2.4 If additional impact testing is required, it shall be carried out in accordance with EN ISO 148-1 to achieve the impact values specified in 10.2.5.4. 4.2.5 The materials of the pressure receptacle which are in contact with the contents shall not contain substances liable to substantially weaken the material. The steel grades specified in EN 10028-2 and
EN 10028-3, listed in Table A.1, are considered compatible with LPG complying with the limitations on corrosiveness as specified in ISO 9162. 4.3 Pressure retaining parts Pressure-retaining materials shall be of appropriate steels conforming to EN 10028-2 or EN 10028-3 or shall conform to specifications agreed with the competent authority. All materials shall conform to 10.2.4 and the ratio of the specified yield strength (ReH) to minimum tensile strength (Rm) shall not exceed 0,85 (i.e. ReH/Rm < 0,85). The percentage elongation at fracture shall be not less than 10 000 divided by the actual tensile strength in N/mm2, and in any case shall be not less than 16 % for fine grained steels and not less than 20 % for other steels. Where fine grain steels are used, the guaranteed yield strength, ReH shall not exceed 460 N/mm2 and the upper tensile strength, Rm, shall not exceed 725 N/mm2. 4.4 Non-pressure retaining parts Non-pressure retaining parts that are directly welded to pressure retaining parts shall be of suitable materials conforming to EN 10025-2 or materials with characteristics approved by a competent authority. All materials used for non-pressure retaining parts shall be compatible with the material of pressure retaining parts, and shall conform to the impact requirements of 10.2.5.4, tested in accordance with the method specified in EN ISO 148-1. 4.5 Welding consumables Welding consumables shall be able to provide consistent welds with properties at least equal to those specified for the parent materials in the finished pressure vessel. 4.6 Non-metallic materials (gaskets) Non-metallic materials (gaskets) shall be compatible with both phases of LPG over the range of pressures and temperatures for which the road tanker is designed (see 4.2, Annex B and Annex C). 4.7 Inspection documents for materials Pressure retaining parts and non-pressure retaining parts directly welded to the pressure vessel shall be provided with the material manufacturers’ certificates conforming to EN 10204:2004 certificate type 3.1. Other parts shall have certificates conforming to EN 10204:2004 certificate type 2.2. SIST EN 12493:2013

 minimizing the environmental impact of in service maintenance and end of life disposal. 5.2 Minimum thickness 5.2.1 The minimum thickness for pressure vessels not exceeding a diameter of 1,8 m shall be 5 mm of reference steel (as defined by ADR) or of an equivalent thickness if in a different steel. 5.2.2 For pressure vessels exceeding a diameter of 1,8 m, the minimum thickness shall be 6 mm of reference steel (as defined by ADR) or of an equivalent thickness if in a different steel. 5.2.3 The equivalent thickness shall be calculated using the Formula (1): ()321101464AReem= (1) where A1 minimum elongation at fracture (%) of steel chosen under tensile stress; e1 minimum shell thickness in chosen steel, in mm; e0 minimum thickness in reference steel, in mm; Rm1 minimum tensile strength of steel chosen, in N/mm2. 5.3 Surge plates 5.3.1 Where it is intended that pressure vessels will be operated in excess of 20 % full or less than 80 % full, surge plates shall be fitted. The surge plates shall be designed to permit full internal inspection of the pressure vessel. The volume between any two plates or a plate and the end of the pressure vessel shall not exceed 7 500 l. 5.3.2 Pressure vessels in excess of 4,0 m in length that are intended to be operated in excess of 20 % full or less than 80 % full shall be fitted with transverse surge plates at a maximum spacing of 4,0 m and shall be designed to permit full internal inspection of the pressure vessel.
5.3.3 The area of each surge plate shall be at least 70 % of the cross-sectional area of the pressure vessel in which the plates are fitted.
5.3.5 Surge plates shall be at least 2 mm thick. 5.3.6 Provision shall be made for communication and drainage between sections. 5.3.7 For pressure vessels over 1,8 m diameter, having a wall thickness less than 6 mm, and for pressure vessels up to 1,8 m diameter, having a wall thickness less than 5 mm, the surge plates shall have the same thickness as the shell and the volume between any two plates or a plate and the end of the pressure vessel shall not exceed 7 500 l. 5.4 Doubler plates To reduce stress concentration on the pressure vessel, load-carrying attachments shall incorporate a doubler plate between the attachment and the pressure vessel shell. Non-circular doubler plates shall be designed with as generous as practicable corner radii (minimum radius 25 mm) to reduce stress concentrations. If doubler plates are provided with test sockets they shall be closed with threaded plugs after testing. 5.5 Stresses due to motion Pressure vessels and their permanent attachments shall be able to absorb, under maximum permissible load, forces exerted by the design pressure, and the following dynamic forces:  in the direction of travel: twice the total mass times gravity;  at right-angles to the direction of travel: the total mass times gravity;  vertically upwards: the total mass times gravity;  vertically downwards: twice the total mass times gravity. Under the forces defined above, the stresses in the pressure vessel and its fastenings shall not exceed the following: a) general membrane stress in the shell, remote from the supports:  the normal design stress as defined in D.1; b) stresses local to the supports, determined either by experimental analysis or calculation/special analysis:  the limits specified in EN 13445-3. 5.6 Self-supporting pressure vessels Self-supporting pressure vessels shall be designed to carry bending stresses that would otherwise be carried by the chassis or frame. 5.7 Vacuum conditions Pressure vessels shall be designed to withstand vacuum conditions generated by the product during operation or other operational conditions, but as a minimum, this shall be equivalent to an external pressure of at least 40 kPa (0,4 bar) gauge pressure. Suitable design methods may be applied from EN 13445-3. SIST EN 12493:2013
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