Bsi bs en 25580 1992 (1999) iso 5580 1985

www bzfxw com BRITISH STANDARD BS EN 25580 1992 ISO 5580 1985 Specification for Minimum requirements for industrial radiographic illuminators for non destructive testing This European Standard EN 2558[.]

BRITISH STANDARD BS EN

25580:1992 ISO 5580:1985

Specification for

Minimum requirements

for industrial

radiographic

illuminators for

non-destructive testing

This European Standard EN 25580:1992 has the status of a

British Standard

This British Standard, having

been prepared under the

direction of the General

Mechanical Engineering

Standards Policy Committee,

was published under the

authority of the

Standards Board and

comes into effect on

15 June 1992

© BSI 02-1999

The following BSI references

relate to the work on this

standard:

Committee reference GME/23

Draft for approval 90/80071 DC

ISBN 0 580 20471 5

Cooperating organizations

The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries

Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y

France Association française de normalisation Germany Deutsches Institut für Normung e.V

Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland

Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portuguès da Qualidade Spain Asociación Española de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige

Switzerland Association suisse de normalisation United Kingdom British Standards Institution

Amendments issued since publication

Amd No Date Comments

BS EN 25580:1992

Contents

Page Cooperating organizations Inside front cover

2 Characteristics of radiographic illuminators 3

3 Determination of certain characteristics 4

National appendix NA (informative) Inside back cover

ii © BSI 02-1999

National foreword

This British Standard has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee and is the English

language version of EN 25580:1992 “Non-destructive testing — Industrial

radiographic illuminators — Minimum requirements” published by the European

Committee for Standardization (CEN)

EN 25580:1992 is identical with ISO 5580:1985 published by the International Organization for Standardization (ISO)

National appendix NA gives the constitution of the committees responsible for

UK participation in the preparation of this standard

A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 25580

April 1992

UDC 620.179.152.05:620.186

Descriptors: Non-destructive tests, industrial radiography, radiographic illuminators, equipment specifications, screens: Display,

luminance, divergence, lighting, optical measurements, marking

English version

Non-destructive testing Industrial radiographic

illuminators Minimum requirements

(ISO 5580:1985)

Essais non destructifs — Négatoscopes utilisés

en radiographie industrielle — Exigences

minimales

(ISO 5580:1985)

Zerstörungsfreie Prüfung — Betrachtungsgeräte für die industrielle Radiographie — Minimale Anforderungen (ISO 5580:1985)

This European Standard was approved by CEN on 1992-03-27 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 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 translation under the

responsibility of a CEN member into its own language and notified to the

Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium,

Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and

United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© CEN 1992 Copyright reserved to all CEN members

Ref No EN 25580:1992 E

© BSI 02-1999 2

Foreword

In 1990, ISO 5580:1985 was submitted to the CEN

Primary Questionnaire procedure

Following the positive result of this procedure, the

CEN Technical Board, agreed to submit

ISO 5580:1985, without modifications, to Formal

Vote The result of the Formal Vote was positive

National standards identical to this European

Standard shall be published at the latest

by 92-10-31 and conflicting national standards shall

be withdrawn at the latest by 92-10-31

In accordance with the CEN/CENELEC Common

Rules, the following countries are bound to

implement this European Standard:

Austria, Belgium, Denmark, Finland, France,

Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal,

Spain, Sweden, Switzerland and United Kingdom

EN 25580:1992

1 Scope and field of application

This International Standard specifies the minimum

requirements for industrial illuminators used for

viewing radiographs

The function of the illuminator is to allow the

viewing of radiographs

The illuminator shall guarantee the same safety of

personnel as an electric apparatus with maximum

voltage, insulation and earthing which is required

by corresponding safety standards of electrotechnics

in each country where these are applied

2 Characteristics of radiographic

illuminators

2.1 Mechanical construction

An illuminator consists of the housing with one of

the sides being the viewing screen illuminated from

the inside This screen can itself be the diffusing

screen This housing may also contain a system for

thermal protection of the radiographs; this system

may or may not be ventilated

For the viewing of wet radiographs, the illuminator

shall be so designed as to prevent penetration of the

liquid if the radiograph comes into contact with the

screen

2.2 Viewing screen

The screens shall be easy to clean and shall be made

of a material which is resistant to scratching during

cleaning processes recommended by the

manufacturer and during film viewing

NOTE The screen may be a combination of elements, all of

which should be resistant to heat in terms of deformation and

discoloration.

The size of the screens shall allow the viewing of a

radiograph without excessive glare reaching the

eyes of the operator Should the illuminator be used

for viewing radiographs of different sizes, a system

of covering masks shall be provided

2.3 Luminance

The screen luminance required depends on the

density of the radiographs The following luminance

levels are recommended for the perception of

information at various density levels

The luminance (or brightness) of the illuminated radiograph shall be not less than:

— 30 cd/m2 for film densities < 2,5

— 10 cd/m2 for film densities > 2,5 and, wherever possible, approximately 100 cd/m2 or higher These minimum values require the

following screen luminance:

NOTE The illuminator may be provided with a device for continuous control of screen luminance.

2.4 Colour of light

The colour of the light used to illuminate the radiograph is normally white However, in the case

of a film with an emulsion type yielding a monocoloured image, light with adapted colours may be used if they have been recommended by the film manufacturers

2.5 Diffusion of light

If the illuminator has a diffusing screen, the light shall be sufficiently divergent so that both eyes of the observer receive rays from all parts of the screen The diffusion factor s9 shall exceed 0,7

(see 3.1).

2.6 Uniformity of illumination

The screen shall be uniformly illuminated, the

uniformity factor g being higher than 0,5 (see 3.2).

2.7 Disturbing light

The housing, blinds and covering masks shall be constructed in such a manner that no disturbing light hinders the viewing of the radiographs

(see clause 3).

2.8 Anti-glare device

Each illuminator shall be fitted with an anti-glare device which, by manual or automatic operation, prevents the operator from being subjected to excessive glare when the radiograph is removed

Film density Minimum screen luminancecd/m2

1 1,5 2 2,5 3 3,5 4 4,5

300

1 000

3 000

10 000

10 000

30 000

100 000

300 000

4 © BSI 02-1999

2.9 Heating

Appropriate precautions shall be taken to ensure

that the temperature of the housing does not

exceed 60 °C at the usual contact surfaces after 1 h

of intermittent operation (50 % switched on with

maximum of 15 s duration at an ambient

temperature of 20 °C) Further precautions shall be

taken to ensure that a radiograph of density 2 does

not warp after a continuous viewing time of 1 min

and 1 h of intermittent operation of the illuminator

3 Determination of certain

characteristics

All photometric measurements shall be carried out

in a dark room The luminance meter has to be used

in the middle part of its measuring scale Moreover,

light escaping from the illuminator even when the

viewing screen is completely masked shall not affect

the measurements

3.1 Divergence and dispersion of light

(of diffusing screens)

The luminance shall be measured on a semi-circle,

the centre of which is the centre of the screen and

the diameter of which is approximately the same as

the maximum dimension of the screen, but at

least 50 cm The luminance shall be measured with

the aid of an appropriate luminance meter, the

sensitive surface of which is a tangent to the curve

of the circle (see the Figure)

These measurements shall be made at angles

of 45° (L45), 20° (L20) and 5° (L5) related to the

normal The diffusion factor s9 shall be calculated

according to the formula

The measurements shall be made successively in

both senses of rotation

3.2 Uniformity of screen luminance

The measurements shall be made with the aid of an

illumination photometer or other suitable

instrument If the screen is rectangular, it shall be

divided into squares, each side of the squares

measuring 3,5 cm, the luminance of each being

measured separately If the screen is circular, the

same basic procedure shall be followed In both

cases, the network of the squares shall be so

arranged that the middle square is centred in the

middle of the screen

The average of the four highest and the average of the four lowest results shall be found, which give the

average arithmetical values of the luminance L max and L min The uniformity factor g shall then be

calculated according to the formula

3.3 Nominal power consumption

The nominal power consumption is the number of watts being consumed by the illuminator after it has been in continuous operation at full luminance for a minimum period of 30 min

4 Marking

A plate which is attached to the illuminator shall give the following information :

a) nominal operating voltage or permissible voltage range;

b) nominal main frequency or permissible frequency range;

c) whether for use with both direct and alternating current or only with one or the other; d) nominal power consumption;

e) maximum luminance in candelas per square metre

5 Recommendations for use

Operating instructions shall be provided with each illuminator to indicate:

a) the operation of the apparatus;

b) instructions for the mounting and replacement

of lamps and screens;

c) care and maintenance;

d) safety precautions;

e) frequency of checking luminance levels

s9 L45+L20

2 L5

-=

g Lmin

Lmax

-=

BS EN 25580:1992

Figure — Light luminance measurement

BS EN 25580:1992

© BSI 02-1999

National appendix NA (informative)

The United Kingdom participation in the preparation of this European Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/23 upon which the following bodies were represented:

Aluminium Federation

Associated Offices Technical Committee

Association of Consulting Engineers

BEAMA Ltd

BNF Metals Technology Centre

British Airways

British Chemical Engineering Contractors’ Association

British Gas plc

British Institute of Non-destructive Testing

British Photographic Association

British Steel Industry

Electricity Industry in United Kingdom

Health and Safety Executive

Institute of Physics

Institute of Quality Assurance

Light Metal Founders’ Association

Lloyd’s Register of Shipping

Ministry of Defence

NAMAS

Power Generation Contractors’ Association (BEAMA Ltd.)

Royal Society of Chemistry

Society of British Aerospace Companies Limited

Society of Motor Manufacturers and Traders Limited

Steel Casting Research and Trade Association

The Welding Institute

389 Chiswick High Road

London

W4 4AL

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

BSI Ð British Standards Institution

BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter

Revisions

British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions

It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400

BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards

Buying standards

Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001

In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested

Information on standards

BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: 020 8996 7111

Fax: 020 8996 7048

Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001

Copyright

Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained

If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager

Tel: 020 8996 7070