SIST EN 14460:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Eksplozijsko vzdržljiva opremaExplosionsfeste GeräteAppareil résistant a l'explosionExplosion resistant equipment29.260.20Electrical apparatus for explosive atmospheres13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 14460:2006SIST EN 14460:2006en01-september-2006SIST EN 14460:2006SLOVENSKI
STANDARD



SIST EN 14460:2006



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14460May 2006ICS 13.230 English VersionExplosion resistant equipmentAppareil résistant à l'explosionExplosionsfeste GeräteThis European Standard was approved by CEN on 23 March 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14460:2006: ESIST EN 14460:2006



EN 14460:2006 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Explosion resistant equipment.7 4.1 General.7 4.2 Design pressure.7 4.3 Design temperature.8 4.4 Additional loads.8 4.5 Wall thickness allowance.8 5 Explosion-pressure-resistant design.8 6 Explosion-pressure-shock resistant design.8 6.1 General.8 6.2 Design and manufacture according to EN 13445 with modified design criteria.9 6.3 Testing.11 7 Documentation of quality of explosion resistant equipment.12 7.1 Pressure vessels.12 7.2 Materials.12 7.3 Welding.12 7.4 Examination and test.12 8 Information for use.13 8.1 Marking.13 8.2 Accompanying documents.13 Annex A (normative)
Calculation of design pressure.14 Annex B (informative)
Examples for limitation of stress concentration.15 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC.17 Bibliography.18 Figures Figure 1 — Explosion resistant equipment.7 Figure 2 — Measures at openings.10 Tables Table 1 — Values of factor F in accordance to Equation (4).12 Table ZA.1 — Correspondence between this European Standard and Directive 94/9/EC.17
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Foreword This document (EN 14460:2006) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres – Explosion prevention and protection”, the secretariat of which is held by DIN. 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 November 2006, and conflicting national standards shall be withdrawn at the latest by November 2006. 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 94/9/EC of 23 March 1994. For relationship with EU Directive 94/9/EC, see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, 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 14460:2006



EN 14460:2006 (E) 4 Introduction The principles of integrated explosion safety includes the following measures the manufacturer has to take: a) prevention of formation of explosive atmospheres; b)
prevention of the ignition of the explosive atmospheres; and c) if an explosion nevertheless occurs, to halt it immediately and/or to limit the range of explosion flames and explosion pressures to a sufficient level of safety. It is essential that methods according to c) be used if the ignition hazard assessment of the equipment shows that the prevention of ignition sources, e.g. by using of types of ignition protection as defined in EN 13463 series, doesn't fulfil the requirements of the intended category which is necessary for the intended use of the equipment. This standard specifies requirements for equipment that shall be explosion resistant. Explosion resistance is the term applied to the construction of an enclosure so that it can withstand an expected explosion pressure without rupture. Giving equipment this property it limits the range of explosion flames and explosion pressures to a sufficient level of safety.
The equipment property "explosion resistance" can be used for equipment, protective systems and components. SIST EN 14460:2006



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1 Scope This standard specifies requirements for explosion-pressure-resistant and explosion pressure shock-resistant equipment. This standard is applicable to process vessels and systems. It is not applicable to individual items of equipment such as motors and gearboxes that may be designed to withstand an internal explosion, which is the subject of EN 13463-3. This standard is valid for atmospheres having pressures ranging from 800 hPa to 1100 hPa and temperatures ranging from - 20 °C to + 60 °C. This standard may also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above, as far as this subject is not covered by specific standards. This standard applies to equipment and combinations of equipment where deflagrations may occur and is not applicable to equipment and combination of equipment where detonation may occur. This standard should not be used for offshore applications. It is essential that this standard be used for equipment made of metallic materials only. 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 10002-1, Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature EN 10204, Metallic products – Types of inspection documents
EN 13237:2003, Potentially explosive atmospheres - Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres EN 13445-1, Unfired pressure vessels – Part 1: General EN 13445-2, Unfired pressure vessels – Part 2: Materials EN 13445-3, Unfired pressure vessels – Part 3: Design EN 13445-4, Unfired pressure vessels – Part 4: Fabrication EN 13980, Potentially explosive atmospheres - Application of quality systems ISO 8421-1:1987, Fire protection – Vocabulary - Part 1: General terms and phenomena of fire SIST EN 14460:2006



EN 14460:2006 (E) 6 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 13237:2003 and ISO 8421-1:1987 and the following apply. 3.1 deflagration explosion propagating at subsonic velocity [ISO 8421-1:1987, 1.11] 3.2 detonation explosion propagating at supersonic velocity and characterized by a shock wave [ISO 8421-1:1987, 1.12] 3.3 explosion abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously [ISO 8421-1:1987, 1.13] 3.4 explosion resistant property of vessels, and equipment designed to be either explosion-pressure-resistant or explosion-pressure-shock resistant [EN 13237:2003, 3.34] 3.5 explosion-pressure-resistant property of vessels, and equipment designed to withstand the expected explosion pressure without becoming permanently deformed [EN 13237:2003, 3.31] 3.6 explosion-pressure-shock resistant property of vessels, and equipment designed to withstand the expected explosion pressure without rupturing, but allowing permanent deformation [EN 13237:2003, 3.32] 3.7 maximum explosion pressure pmax maximum pressure occurring in a closed vessel during the explosion of a specific explosive atmosphere determined under specified test conditions [EN 13237:2003, 3.81] 3.8 maximum allowable explosion pressure pexmax calculated maximum explosion pressure which the equipment will withstand SIST EN 14460:2006



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3.9 reduced explosion pressure pred pressure generated by an explosion of an explosive atmosphere in a vessel, protected by either explosion relief or explosion suppression [EN 13237:2003, 3.100] 4 Explosion resistant equipment 4.1 General Explosion resistant equipment shall be so constructed that it can withstand an internal explosion without rupturing. In general, a distinction is made between the following designs:  design for the maximum explosion pressure;  design for the reduced explosion pressure in conjunction with explosion pressure relief or explosion suppression. Components of the system can be either explosion-pressure-resistant or explosion-pressure shock resistant.
Explosion resistant equipment
Explosion-pressure-resistant equipment
Explosion-pressure-shock resistant equipment Figure 1 — Explosion resistant equipment 4.2 Design pressure The design pressure shall not be less than the maximum gauge pressure occurring in the equipment, when subjected to explosion or reduced explosion conditions. The design pressure shall be used as the calculation pressure as detailed in EN 13445-3. NOTE 1 If the inside of the equipment is divided into sections (e.g. tanks connected by a pipeline or containing baffles or surge plates), during an explosion in one of the sections the pressure in the other sections of the equipment will be increased. As a result, an explosion in these sections will occur at an elevated initial pressure. Further, pressure peaks occur which are higher than the value expected under atmospheric conditions. In the case of such arrangements, appropriate measures should be taken, either explosion de-coupling techniques or explosion resistant design derived from representative explosion trials. NOTE 2 Pressures quoted are gauge pressures unless otherwise stated. For guidance on the derivation of design pressure see Annex A. SIST EN 14460:2006



EN 14460:2006 (E) 8 4.3 Design temperature For wall temperatures governed by the weather or by the vessel charge of less than – 10 °C EN 13445-2 shall be consulted for material requirements. In case of an explosion there is only a marginal heat up of the vessel walls. Therefore, the anticipated operating temperature at the initial pressure shall be used as the design temperature. 4.4 Additional loads Loads which are due to an activation of a venting device, due to product l
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