SIST EN 15856:2011
(Main)Non-destructive testing - Acoustic emission - General principles of AE testing for the detection of corrosion within metallic surrounding filled with liquid
Non-destructive testing - Acoustic emission - General principles of AE testing for the detection of corrosion within metallic surrounding filled with liquid
This European Standard describes acoustic emission testing (AT) on metallic surroundings filled with liquids for the detection of corrosion processes that are active at the time of the test. It is applicable to metallic storage tanks, such as those used in the chemical and petrochemical industry. The results provide a qualitative statement regarding the condition of the test object and a recommendation regarding the maximum allowable duration of the follow-on service period, based on the AT indications and additional information in order to characterize the AT indications. In the case of flat bottomed storage tanks (FBST) the procedure described within this standard provides testing of the complete bottom, the tank shell up to the filling height and in case of a floating roof tank also the roof sheets in contact with the stored liquid. As for every application of acoustic emission testing, the measured data contain information regarding active sources. An ongoing corrosion process, such as general corrosion and localized corrosion defined in EN ISO 8044, leading to progressive loss of wall thickness will be detected. A corrosion process which has stopped does not produce acoustic emission and will therefore not be detected at the time of test.
Zerstörungsfreie Prüfung - Schallemission - Allgemeine Grundsätze der Schallemissionsprüfung zum Nachweis von Korrosion innerhalb von mit Flüssigkeit gefüllten metallischen Umschließungen
Diese Norm beschreibt eine Schallemissionsprüfung (en: acoustic emission testing, AT) an mit Flüssigkeiten gefüllten metallischen Umschließungen zum Nachweis von Korrosionsprozessen, die zum Zeitpunkt der Prüfung aktiv sind. Sie ist auf metallische Lagertanks anwendbar, wie sie z. B. in der chemischen und petrochemischen Industrie eingesetzt werden. Die Ergebnisse führen zu einer qualitativen Aussage hinsichtlich des Zustandes der geprüften Teile, einer Empfehlung hinsichtlich der maximal zulässigen nachfolgenden Nutzungsdauer auf der Grundlage der gefun¬denen Anzeigen und zusätzlichen Informationen zur Charakterisierung der gefundenen Anzeigen.
Im Fall von Flachbodenlagertanks (en: flat bottomed storage tanks, FBST) umfasst das in dieser Norm be¬schriebene Verfahren die Prüfung des gesamten Bodens, des Tankmantels bis zur Füllhöhe und im Fall von Schwimmdachtanks auch das Tankdach, das sich in Kontakt mit dem flüssigen Lagerprodukt befindet. Wie bei jeder Anwendung der Schallemissionsprüfung enthalten die Messdaten Informationen hinsichtlich aktiver Quellen. Nachgewiesen wird ein permanenter Korrosionsprozess, wie z. B. die allgemeine Korrosion und die örtliche Korrosion, definiert in EN ISO 8044, wobei dieser zu einer fortschreitenden Abnahme der Wanddicke führt. Ein zum Stillstand gekommener Korrosionsprozess erzeugt keine Schallemission und wird daher nicht nachgewiesen.
Essais non destructifs - Emission acoustique - Principes généraux des contrôles par émission acoustique pour la détection de la corrosion dans une enceinte métallique remplie de liquide
La présente norme décrit les contrôles par émission acoustique (EA) dans une enceinte métallique remplie de liquides destinés à la détection de processus de corrosion qui sont actifs au moment du contrôle. Elle s’applique aux réservoirs de stockage métalliques tels que ceux utilisés dans l’industrie chimique et en pétrochimie.
Les résultats fournissent des caractéristiques qualitatives relatives à l’état de l’objet soumis à l’essai ainsi qu’une recommandation sur la durée maximale admissible de la période d’exploitation ultérieure basée sur les indications des contrôles par émission acoustique et sur des informations complémentaires afin de caractériser les indications des contrôles par émission acoustique. Dans le cas de réservoirs de stockage à fond plat, le mode opératoire décrit dans la présente norme prévoit le contrôle de la totalité du fond, de l’enveloppe jusqu’à la hauteur de remplissage et, dans le cas d’un réservoir à toit flottant, également des tôles de couverture en contact avec le liquide stocké.
Comme pour chaque application dans le domaine du contrôle par émission acoustique, les données mesurées contiennent des informations relatives aux sources actives. Un processus continu de corrosion, comme par exemple une corrosion généralisée et une corrosion localisée, définie dans l’ISO 8044, conduisant à une perte progressive de l’épaisseur de paroi, sera détecté. Un processus de corrosion qui s’est arrêté ne produit plus d’émission acoustique et ne sera donc pas détecté.
Neporušitveno preskušanje - Akustična emisija - Osnove preskušanja z AE pri zaznavanju korozije v kovinskih posodah, napolnjenih s tekočino
Ta evropski standard opisuje preskušanje z akustično emisijo (AT) na kovinskih posodah, napolnjenih s tekočino, za zaznavanje postopkov korozije, ki so aktivni med preskusom. Velja za take kovinske rezervoarje, kot so tisti, uporabljeni v kemični in petrokemični industriji. Rezultati podajajo kvalitativno navedbo glede stanja preskušanega predmeta in priporočilo glede najdaljšega dovoljenega trajanja nadaljnjega obdobja obratovanja, temelječo na navedbah AT in dodatnih informacijah za podroben opis teh navedb AT. Pri rezervoarju s ploskim dnom (FBST) postopek, opisan v okviru tega standarda, zagotavlja preskušanje celotnega dna, ogrodja rezervoarja do višine za polnjenje in pri plavajoči strehi rezervoarja tudi strešne plošče, ki so v stiku s shranjeno tekočino. Tako kot pri vsaki uporabi preskušanja z akustično emisijo, izmerjeni podatki vsebujejo informacije o aktivnih virih. Tekoči postopek korozije, kot je splošna korozija ali lokalizirana korozija, opisan v EN ISO 8044, ki vodi v progresivno izgubo debeline zidu, se bo opazil. Postopek korozije, ki se je zaustavil, ne proizvede akustične emisije in se potemtakem ne bo opazil med preskusom.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zerstörungsfreie Prüfung - Schallemission - Allgemeine Grundsätze der Schallemissionsprüfung zum Nachweis von Korrosion innerhalb von mit Flüssigkeit gefüllten metallischen UmschließungenEssais non destructifs - Emission acoustique - Principes généraux des contrôles par émission acoustique pour la détection de la corrosion dans une enceinte métallique remplie de liquideNon-destructive testing - Acoustic emission - General principles of AE testing for the detection of corrosion within metallic surrounding filled with liquid19.100Neporušitveno preskušanjeNon-destructive testingICS:Ta slovenski standard je istoveten z:EN 15856:2010SIST EN 15856:2011en,fr,de01-februar-2011SIST EN 15856:2011SLOVENSKI
STANDARD
SIST EN 15856:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15856
January 2010 ICS 19.100 English Version
Non-destructive testing - Acoustic emission -General principles of AE testing for the detection of corrosion within metallic surrounding filled with liquid
Essais non destructifs - Emission acoustique - Principes généraux des contrôles par émission acoustique pour la détection de la corrosion dans une enceinte métallique remplie de liquide
Zerstörungsfreie Prüfung - Schallemissionsprüfung - Allgemeine Grundsätze der Schallemissionsprüfung zum Nachweis von Korrosion innerhalb von mit Flüssigkeit gefüllten metallischen Umschließungen This European Standard was approved by CEN on 28 November 2009.
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.
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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 15856:2010: ESIST EN 15856:2011
EN 15856:2010 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Terms and definitions .44Personnel qualifications .55General .55.1Introduction .55.2Test preparation .55.3Sensors .55.4Source location .55.5Preliminary information .65.6Written instruction requirements .66Instrumentation .77Testing .77.1Sensor positions .77.2Test detection threshold .87.3Background noise .97.4In-situ verification .97.5Apparent acoustic emission velocity .97.6Performing the test . 108Interpretation of results . 108.1Data evaluation . 108.2Tank grading . 109Documentation . 1010Safety regulations . 11 SIST EN 15856:2011
EN 15856:2010 (E) 3 Foreword This document (EN 15856:2010) has been prepared by Technical Committee CEN/TC 138 “Non-destructive testing”, the secretariat of which is held by AFNOR. 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 2010, and conflicting national standards shall be withdrawn at the latest by July 2010. 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 the United Kingdom. SIST EN 15856:2011
EN 15856:2010 (E) 4 1 Scope This European Standard describes acoustic emission testing (AT) on metallic surroundings filled with liquids for the detection of corrosion processes that are active at the time of the test. It is applicable to metallic storage tanks, such as those used in the chemical and petrochemical industry. The results provide a qualitative statement regarding the condition of the test object and a recommendation regarding the maximum allowable duration of the follow-on service period, based on the AT indications and additional information in order to characterize the AT indications. In the case of flat bottomed storage tanks (FBST) the procedure described within this standard provides testing of the complete bottom, the tank shell up to the filling height and in case of a floating roof tank also the roof sheets in contact with the stored liquid. As for every application of acoustic emission testing, the measured data contain information regarding active sources. An ongoing corrosion process, such as general corrosion and localized corrosion defined in EN ISO 8044, leading to progressive loss of wall thickness will be detected. A corrosion process which has stopped does not produce acoustic emission and will therefore not be detected at the time of test. 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 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles EN 1330-1:1998, Non-destructive testing — Terminology — Part 1: List of general terms EN 1330-2:1998, Non-destructive testing — Terminology — Part 2: Terms common to the non-destructive testing methods EN 1330-9:2009, Non-destructive testing — Terminology — Part 9: Terms used in acoustic emission testing EN 13477-1, Non-destructive testing — Acoustic emission — Equipment characterisation — Part 1: Equipment description EN 13477-2, Non-destructive testing — Acoustic emission — Equipment characterisation — Part 2: verification of operating characteristics EN 13554, Non-destructive testing — Acoustic emission — General principles EN ISO 8044:1999, Corrosion of metals and alloys — Basic terms and definitions (ISO 8044:1999) EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2005) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1330-1:1998, EN 1330-2:1998, EN 1330-9:2009 and EN ISO 8044:1999 apply. SIST EN 15856:2011
EN 15856:2010 (E) 5 4 Personnel qualifications It is assumed that acoustic emission testing is performed by qualified and capable personnel. In order to prove this qualification, it is recommended to certify the personnel in accordance with EN 473. 5 General 5.1 Introduction Evaluation of the AE data shall be done according to an established grading system, providing grades relating to the rate of degradation of the component under test as a result of corrosion. The recommended duration of the service period following the test is with respect to the service condition prior to and at the time of the test. This recommendation is invalid, if the storage product or any other major service parameter has been altered. The final test result shall not be affected by external or internal noise sources. The testing service provider has to communicate the demands regarding tank preparation to the tank operator. Proper support by the plant personnel for identification and elimination of noise sources shall be ensured. 5.2 Test preparation AE originating from corrosion propagates through both the liquid and the structure. Where corrosion testing of tanks utilises wave propagation through the liquid stock product, the minimum filling level of the tank to be tested shall exceed the highest position of sensors mounted onto the tank shell at least by 1 m. When testing flat bottomed storage tanks (FBST) the tank operation shall be static before the test in order to reduce internal noise to a minimum. No product shall be fed into or taken out of the tank, no internal circulation shall take place and, if operated, the heater shall be shut down. The necessary time period varies depending on the tank size and the stock product. Twenty-four hours is usually sufficient. 5.3 Sensors When wave propagation through the liquid is used, the sensor frequency band is usually in the range from 20 kHz to 80 kHz. When wave propagation through the metal is used, the sensing frequency band is usually in the range from 100 kHz to 300 kHz. The equipment surface below the sensors shall be prepared to ensure the maximum coupling efficiency. The sensor cou
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