EN 14127:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zerstörungsfreie Prüfung - Dickenmessung mit UltraschallEssais non destructifs - Mesurage de l'épaisseur par ultrasonsNon-destructive testing - Ultrasonic thickness measurement19.100Neporušitveno preskušanjeNon-destructive testingICS:Ta slovenski standard je istoveten z:EN 14127:2004SIST EN 14127:2004en01-november-2004SIST EN 14127:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14127August 2004ICS 19.100English versionNon-destructive testing - Ultrasonic thickness measurementEssais non destructifs - Mesurage de l'épaisseur parultrasonsZerstörungsfreie Prüfung - Dickenmessung mit UltraschallThis European Standard was approved by CEN on 16 February 2004.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, 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© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14127:2004: ESIST EN 14127:2004

Corrosion in vessels and piping.22 A.1 General.22 A.2 Measurement of general corrosion.22 A.2.1 Instrument.22 A.2.2 Probes.22 A.2.3 Setting of the instrument.22 A.2.4 Measuring.23 A.3 Measurement of corrosion with pitting.23 A.3.1 Instrument.23 A.3.2 Probes.23 A.3.3 Setting of the instrument.23 A.3.4 Measuring.23 Annex B (informative)
Instrument settings.27 Annex C (informative)
Parameters influencing accuracy.29 C.1 Parameters influencing accuracy.29 C.2 Methods of calculation.31 Annex D
(informative)
Measuring technique selection.34
General principles. EN 583-2, Non-destructive testing  Ultrasonic examination  Part 2: Sensitivity and range setting. EN 1330-4:2000, Non-destructive testing  Terminology  Part 4: Terms used in ultrasonic testing. 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1330-4:2000 apply. 4 Measurement modes The thickness of a part or structure is determined by accurately measuring the time required for a short ultrasonic pulse generated by a transducer to travel through the thickness of the material once, twice or several times. The material thickness is calculated by multiplying the known sound velocity of the material with the transit time and dividing by the number of times the pulse transits the material wall. This principle can be accomplished by applying one of the following modes, see Figure 1: Mode 1: Measure the transit time from an initial excitation pulse to a first returning echo, minus a zero correction to account for the thickness of the transducer wear surface and the couplant layer (single echo mode). Mode 2: Measure the transit time from the end of a delay line to the first backwall echo (single echo delay line mode). Mode 3: Measure the transit time between backwall echoes (multiple echoes). Mode 4: Measure the transit time for a pulse travelling from the transmitter to a receiver in contact with the backwall (through transmission mode). SIST EN 14127:2004

Mode 1 Mode 2
Mode 3
Mode 4 Key A Transmit/Receive probeDTransmission pulse indication A1 Transmit probe E1 to E3Backwall echoesA2 Receive probe FInterface echoA3 Double transducer probeGDelay pathB Test object HReceived pulseC Sound path travel time Figure 1 — Measurement modes SIST EN 14127:2004

are used then compensation for V-path error is required; c) on curved objects the diameter of the probe contact area shall be significantly smaller than the diameter of the test object; SIST EN 14127:2004

t/n (1) where
d = thickness; v = sound velocity; t = measured time;
n = number of transits through the test object (see Figure 1). SIST EN 14127:2004
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