EN ISO 20769-1:2018
(Main)Non-destructive testing - Radiographic inspection of corrosion and deposits in pipes by X - and gamma rays - Part 1: Tangential radiographic inspection (ISO 20769-1:2018)
Non-destructive testing - Radiographic inspection of corrosion and deposits in pipes by X - and gamma rays - Part 1: Tangential radiographic inspection (ISO 20769-1:2018)
This document specifies fundamental techniques of film and digital radiography with the object of enabling satisfactory and repeatable results to be obtained economically. The techniques are based on generally recognized practice and fundamental theory of the subject.
This document applies to the radiographic examination of steel pipes for service induced flaws such as corrosion pitting, generalized corrosion and erosion. Besides its conventional meaning, "pipe" as used in this document is understood to cover other cylindrical bodies such as tubes, penstocks, boiler drums and pressure vessels.
Weld inspection for typical welding process induced flaws is not covered, but weld inspection is included for corrosion/erosion type flaws.
The pipes can be insulated or not, and can be assessed where loss of material due, for example, to corrosion or erosion is suspected either internally or externally.
This document covers the tangential inspection technique for detection and through-wall sizing of wall loss, including with the source:
a) on the pipe centre line; and
b) offset from pipe centre line by the pipe radius.
ISO 20769-2 covers double wall radiography, and note that the double wall double image technique is often combined with tangential radiography with the source on the pipe centre line.
This document applies to tangential radiographic inspection using industrial radiographic film techniques, computed radiography (CR) and digital detector arrays (DDA).
Zerstörungsfreie Prüfung - Durchstrahlungsprüfung auf Korrosion und Ablagerungen in Rohren mit Röntgen- und Gammastrahlen - Teil 1: Tangentiale Durchstrahlungsprüfung (ISO 20769-1:2018)
Essais non destructifs - Examen radiographique de la corrosion et des dépôts dans les canalisations, par rayons X et rayons gamma - Partie 1: Examen radiographique tangentiel (ISO 20769-1:2018)
Le présent document spécifie les techniques fondamentales de radiographie film et de radiographie numérique permettant d'obtenir des résultats satisfaisants et reproductibles de façon économique. Ces techniques sont fondées sur les pratiques généralement reconnues et la théorie fondamentale sur ce sujet.
Le présent document s'applique à l'examen radiographique des canalisations en acier présentant des défauts induits par le service, tels que des piqûres de corrosion, une corrosion généralisée et l'érosion. Dans le présent document, il convient d'interpréter le terme « canalisation » au sens conventionnel ainsi que dans un sens plus large couvrant les autres corps cylindriques tels que les tubes, les conduites forcées, les corps de chaudière et les récipients sous pression.
La présente norme couvre uniquement l'examen des soudures visant à détecter l'éventuelle présence de défauts de type corrosion/érosion, et non les défauts classiques induits par les procédés de soudage.
Les canalisations peuvent être pourvues ou dépourvues d'isolation et faire l'objet d'une évaluation en cas de suspicion de perte de matière interne ou externe, par exemple due à la corrosion ou à l'érosion.
Le présent document traite de la technique d'examen radiographique tangentiel qui permet de détecter et de dimensionner la perte de matière dans le sens de l'épaisseur, notamment, avec la source:
a) alignée sur l'axe central de la canalisation; et
b) décalée de l'axe central de la canalisation d'une distance égale au rayon de la canalisation.
L'ISO 20769-2 couvre la radiographie double paroi et il faut noter que la technique double paroi/double image est souvent combinée avec l'examen radiographique tangentiel en plaçant la source sur l'axe central de la canalisation.
Le présent document s'applique aux examens radiographiques tangentiels qui utilisent des techniques de films radiographiques industriels, la radiographie numérique (CR) et les mosaïques de détecteurs numériques (DDA).
Neporušitvene preskave - Radiografski pregled korozije in nanosov v ceveh z rentgenskimi žarki in žarki gama - 1. del: Tangencialni radiografski pregled (ISO 20769-1:2018)
Ta evropski standard določa temeljne tehnike filmske in digitalne radiografije z namenom omogočanja zadovoljivih in ponovljivih rezultatov, ki so stroškovno ugodni. Tehnike so osnovane na splošno priznani praksi in temeljnem poznavanju subjekta.
Ta evropski standard velja za radiografski pregled cevi in kovinskih materialov za poškodbe, ki so posledica uporabe, kot na primer jamičasta korozija, splošna korozija in erozija. Poleg svojega klasičnega pomena izraz »cev«, kot je uporabljen v tem standardu, zajema tudi druga cilindrična telesa, kot so dovodni kanali, bobni kotlov in tlačne posode.
Standard ne zajema pregleda zvarov za običajne napake, ki so posledica varilnega postopka, vključuje pa pregled zvarov za napake, ki so posledica korozije/erozije.
Cevi so lahko izolirane ali ne in jih je mogoče pregledati, če se sumi na notranjo ali zunanjo poškodbo materiala, ki je posledica korozije ali erozije.
Ta del standarda EN 16407 zajema tehniko tangencialnega pregleda za odkrivanje in ugotavljanje obsega poškodbe sten, ki se izvede skozi steno, vključno z:
a) virom na središčnici cevi in
b) virom, odmaknjenim od središčnice za polmer cevi.
2. del standarda EN 16407 zajema radiografijo prek dveh sten. Dvoslikovna tehnika prek dveh sten se pogosto uporablja skupaj s tangencialno radiografijo z virom na središčnici cevi.
Ta evropski standard velja za tangencialni radiografski pregled, ki uporablja tehnike industrijskega radiografskega filma, računalniško digitalno radiografijo (CR) ali radiografijo z digitalnimi detektorskimi nizi (DDA).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2019
1DGRPHãþD
SIST EN 16407-1:2014
Neporušitvene preskave - Radiografski pregled korozije in nanosov v ceveh z
rentgenskimi žarki in žarki gama - 1. del: Tangencialni radiografski pregled (ISO
20769-1:2018)
Non-destructive testing - Radiographic inspection of corrosion and deposits in pipes by X
- and gamma rays - Part 1: Tangential radiographic inspection (ISO 20769-1:2018)
Zerstörungsfreie Prüfung - Durchstrahlungsprüfung auf Korrosion und Ablagerungen in
Rohren mit Röntgen- und Gammastrahlen - Teil 1: Tangentiale Durchstrahlungsprüfung
(ISO 20769-1:2018)
Essais non destructifs - Examen radiographique de la corrosion et des dépôts dans les
canalisations, par rayons X et rayons gamma - Partie 1: Examen radiographique
tangentiel (ISO 20769-1:2018)
Ta slovenski standard je istoveten z: EN ISO 20769-1:2018
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 20769-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2018
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN 16407-1:2014
English Version
Non-destructive testing - Radiographic inspection of
corrosion and deposits in pipes by X - and gamma rays -
Part 1: Tangential radiographic inspection (ISO 20769-
1:2018)
Essais non destructifs - Examen radiographique de la Zerstörungsfreie Prüfung - Durchstrahlungsprüfung
corrosion et des dépôts dans les canalisations, par auf Korrosion und Ablagerungen in Rohren mit
rayons X et rayons gamma - Partie 1: Examen Röntgen- und Gammastrahlen - Teil 1: Tangentiale
radiographique tangentiel (ISO 20769-1:2018) Durchstrahlungsprüfung (ISO 20769-1:2018)
This European Standard was approved by CEN on 5 August 2018.
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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20769-1:2018 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 20769-1:2018) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing" in collaboration with 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 April 2019, and conflicting national standards shall be
withdrawn at the latest by April 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 16407-1:2014.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 20769-1:2018 has been approved by CEN as EN ISO 20769-1:2018 without any
modification.
INTERNATIONAL ISO
STANDARD 20769-1
First edition
2018-09
Non-destructive testing —
Radiographic inspection of corrosion
and deposits in pipes by X- and
gamma rays —
Part 1:
Tangential radiographic inspection
Essais non destructifs — Examen radiographique de la corrosion et
des dépôts dans les canalisations, par rayons X et rayons gamma —
Partie 1: Examen radiographique tangentiel
Reference number
ISO 20769-1:2018(E)
©
ISO 2018
ISO 20769-1:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2018 – All rights reserved
ISO 20769-1:2018(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification of radiographic techniques . 4
5 General . 5
5.1 Protection against ionizing radiation . 5
5.2 Personnel qualification . 5
5.3 Identification of radiographs . 5
5.4 Marking . 5
5.5 Overlap of films or digital images . 5
5.6 Types and positions of image quality indicators (IQI) . 5
5.6.1 Single wire or step hole IQIs . 5
5.6.2 Duplex wire IQI (digital radiographs) . 5
6 Recommended techniques for making radiographs . 6
6.1 Test arrangements . 6
6.1.1 General. 6
6.1.2 Radiation source located on the pipe centre line . 6
6.1.3 Radiation source located offset from the pipe centre line . 7
6.1.4 Alignment of beam and film/detector . 9
6.2 Choice of radiation source . . 9
6.3 Film systems and metal screens .10
6.4 Screens and shielding for imaging plates (computed radiography only).11
6.5 Reduction of scattered radiation .12
6.5.1 Filters and collimators .12
6.5.2 Interception of back scattered radiation .13
6.6 Source-to-detector distance .13
6.7 Axial coverage and overlap .14
6.8 Dimensional comparators .15
6.9 Image saturation and use of lead strips to avoid burn-off .16
6.10 Selection of digital radiographic equipment .16
6.10.1 General.16
6.10.2 CR systems .17
6.10.3 DDA systems .17
7 Radiograph/digital image sensitivity, quality and evaluation.17
7.1 Evaluation of image quality .17
7.1.1 General.17
7.1.2 Maximum grey level in free beam (digital radiographs) .17
7.1.3 Minimum normalized signal-to-noise ratio (digital radiographs) .17
7.2 Density of film radiographs . .18
7.3 Film processing.18
7.4 Film viewing conditions .18
7.5 Dimensional calibration of radiographs or digital images .19
7.5.1 General.19
7.5.2 Measurement of distances in radiographic setup .19
7.5.3 Measurement of pipe outside diameter .20
7.5.4 Dimensi
...
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