Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 42 4 European standard for manufacturing unfired pressure vessels 4.1 Introduction A possible definition of pressure vessel is “housing and its direct attachments up to the coupling point connecting it to other equipment, designed and built to contain fluids under pressure”. Many standards have been developed trough the years to consider the criteria for design, manufacturing and testing of these standards, mainly taking into consideration the hazard arising from possible failure of the vessels. As a consequence, all the European countries produced their own technical standards, having as a reference both the technical conditions (generally the same in every country) and the national industrial customs. After the development of the European Market, and in order to guarantee harmonisation of national legislation to abolish commercial and technical barriers, the European directive 97/23/CE on pressure equipment (PED) has been developed, applicable to all pressure equipment working with internal or external pressure higher than 0,5 bar. The application of the directive indirectly implied a standardisation work for the production of sets of standards, within the field of application of the directive and supporting its essential requirements, as a mean to demonstrate conformity. In this framework the technical committee CEN TC 54 “Unfired pressure vessels” prepared the standard EN 13445, harmonised to the 97/23/CE directive, relating to unfired pressure vessels subject to a maximum allowable pressure greater than 0,5 bar gauge and with maximum allowable temperatures for which creep effects need not to be considered, i.e. for maximum allowable temperatures for which the corresponding maximum calculation temperature renders a relevant proof strength smaller than the 100 000 h creep rupture strength 8 . 8 In the case of ferritic steels, for ferritic steels the temperature limit corresponds to calculation temperatures below approximately 380 °C. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 43 Figure 12 – A polyethylene reactor made of Carbon steel This European Standard is not applicable to the following types of pressure equipment: - transportable pressure equipment; - items specifically designed for nuclear use, the failure of which may cause a release of radioactivity; - pressure equipment intended for the generation of steam or superheated water at temperatures higher than 110 °C; - vessels of riveted construction; - vessels of lamellar cast iron or any other materials not included in EN 13445-2 or EN 13445- 6; - multilayered, autorefragged or pre-stressed vessels; - pipelines and industrial piping. The standard is composed by 6 parts and a technical report; a brief description of which will be given in the next paragraphs. 4.2 EN 13445 – 1: General rules This Part outlines the basic principles underpinning the standard. The Manufacturer is required to declare that the technical design specification and the supporting documentation are in compliance with the requirements of this standard. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
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Welding Fabrication Standards - EWF

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