涂漆及相关产品施工前钢材表面准备——表面清洁度目视评估——第1部分：未涂漆钢材基材及整体去除前涂层后钢材基材的锈蚀等级和准备等级

6

Sa 3 Blast-cleaning to visually clean steel

When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from mill scale, rust, paint coatings and foreign matter. It shall have a uniform metallic colour. See photographs A Sa 3, B Sa 3, C Sa 3 and D Sa 3.

4.3 Hand and power tool cleaning, St

Surface preparation by hand and power tool cleaning, such as scraping, wire-brushing, machine-brushing and grinding, is designated by the letters "St".

Prior to hand and power tool cleaning, any heavy layers of rust shall be removed by chipping. Visible oil, grease and dirt shall also be removed.

After hand and power tool cleaning, the surface shall be cleaned from loose dust and debris.

NOTES

1. For descriptions of surface preparation methods by hand and power tool cleaning, including treatment prior to, and after, the hand and power tool cleaning procedure, see ISO 8504-3.
2. Preparation grade St 1 is not included as it would correspond to a surface unsuitable for painting.

St 2 Thorough hand and power tool cleaning

When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and from poorly adhering mill scale, rust, paint coatings and foreign matter (see note 2 to 4.1). See photographs B St 2, C St 2 and D St 2.

St 3 Very thorough hand and power tool cleaning

As for St 2, but the surface shall be treated much more thoroughly to give a metallic sheen arising from the metallic substrate. See photographs B St 3, C St 3 and D St 3.

4.4 Flame cleaning, Fl

Surface preparation by flame cleaning is designated by the letters "Fl".

NOTE Flame cleaning includes final power tool wire-brushing to remove the products of the cleaning process; hand wire-brushing does not achieve a satisfactory surface for painting.

Prior to flame cleaning, any heavy layers of rust shall be removed by chipping.

After flame cleaning, the surface shall be cleaned by power tool wire-brushing.

Fl Flame cleaning

When viewed without magnification, the surface shall be free from mill scale, rust, paint coatings and foreign matter. Any remaining residues shall show only as a discoloration of the surface (shades of different colours). See photographs A Fl, B Fl, C Fl and D Fl.

5 Procedure for visual assessment of steel substrates

Either in good diffuse daylight or in equivalent artificial illumination, examine the steel surface and compare it with each of the photographs (see clause 6), using normal vision. Place the appropriate photograph close to, and in the plane of, the steel surface to be assessed.

For rust grades, record the assessment as the worst grade that is evident. For preparation grades, record the assessment as that grade nearest in appearance to that of the steel surface.

NOTES

1. In addition to the type of cleaning method used, for example dry blast cleaning using a particular type of abrasive, the following factors can influence the result of the visual assessment:
   • initial state of the steel surface other than any of the standard rust grades A, B, C and D;
   • colour of the steel itself;
   • regions of differing roughness, resulting from differential corrosion attack or uneven removal of material;
   • surface irregularities such as dents;
   • marks from tools;
   • uneven lighting;
   • shadowing of the surface profile caused by angled projection of abrasive;
   • embedded abrasives.
2. For previously painted surfaces that have been prepared for renewed painting, only photographs with rust grade designations D or C (for example: D Sa 2½ or C Sa 2½) may be used for the visual assessment. The choice (for example between D Sa 2½ and C Sa 2½) depends on the degree of pitting.

7

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• Bulletin de la CEI
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Terminologie

En ce qui concerne la terminologie générale, le lecteur se reportera à la Publication 50 de la CEI : Vocabulaire Electrotechnique International (VEI), qui est établie sous forme de chapitres séparés traitant chacun d'un sujet défini, l'Index général étant publié séparément. Des détails complets sur le VEI peuvent être obtenus sur demande.

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• la Publication 27 de la CEI : Symboles littéraux à utiliser en électrotechnique ;
• la Publication 617 de la CEI : Symboles graphiques pour schémas.

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Terminology

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• IEC Publication 27 : Letter symbols to be used in electrical technology ;
• IEC Publication 617 : Graphical symbols for diagrams.

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IEC publications prepared by the same Technical Committee

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2

NORME INTERNATIONALE INTERNATIONAL STANDARD МЕЖДУНАРОДНЫЙ СТАНДАРТ

NORME INTERNATIONALE INTERNATIONAL STANDARD МЕЖДУНАРОДНЫЙ СТАНДАРТ

CEI IEC 50(426) Première édition First edition 1990-10 Vocabulaire Electrotechnique International Chapitre 426 : Matériel électrique pour atmosphères explosives International Electrotechnical Vocabulary Chapter 426 : Electrical apparatus for explosive atmospheres Международный Электротехнический Словарь Глава 426 : Электрооборудование для взрывоопасных сред © CEI 1990 Droits de reproduction réservés - Copyright - all rights reserved - Право издания охраняется законом Aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Запрещается Без письменного разрешения издателя воспроизведение или копирование этой публикации или ее части в любой форме или любыми средствами — электронными или механическими, включая фотоконю и микрофильм. Bureau central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève Suisse Commission Electrotechnique Internationale International Electrotechnical Commission Международная Электротехническая Комиссия Code prix Price code Код цены S Pour prix, voir catalogue en vigueur For price, see current catalogue Цена указана в действующем каталоге 3

50(715) © IEC:1996

CONTENTS

FOREWORD	VII
PREFACE	VII
Sections
715-01	Basic terms	1
715-02	Resources	10
715-03	Calls	17
715-04	Times and delays	22
715-05	Traffic	24
715-06	Circuit groups	32
715-07	Traffic engineering	34
715-08	Networks	41
715-09	Circuit switched networks	46
715-10	Message switched networks	51
715-11	Packet switched networks	52
Index	53

:current

Foreword

This document (EN 10216-3:2002) has been prepared by Technical Committee EC/TC 29, "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.

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 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.

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(s).

For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.

Other Parts of EN 10216 are:

Part 1:	Non-alloy steel tubes with specified room temperature properties
Part 2:	Non-alloy and alloy steel tubes with specified elevated temperature properties
Part 4:	Non-alloy and alloy steel tubes with specified low temperature properties
Part 5:	Stainless steel tubes

Another European Standard series covering tubes for pressure purposes is:

EN 10217:

Welded steel tubes for pressure purposes

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

5

ISO 657-1 : 1988 (E)

Table 1 — Dimensions and sectional properties of hot-rolled equal-leg angles (concluded)

Designation	Mass kg/m	Sectional area cm²	Dimensions		Distances of centre of gravity		Sectional properties about axes
			X-X = Y-Y		U-U								V-V
			A mm	l mm	rroot mm	cx = cy cm	cu cm	cv cm	Ix = Iy cm⁴	rx = ry cm	Zx = Zy cm³	Iu cm⁴	ru cm	Iv cm⁴	rv cm	Zv cm³
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)	(16)	(17)
200 × 200 × 16	48,5	61,8	200	16	18	5,52	14,1	7,81	2 340	6,16	162	3 720	7,76	960	3,94	123
200 × 200 × 20	59,9	76,3	200	20	18	5,68	14,1	8,04	2 850	6,11	199	4 530	7,70	1 170	3,92	146
200 × 200 × 24	71,1	90,6	200	24	18	5,84	14,1	8,26	3 330	6,06	235	5 280	7,64	1 380	3,90	167
250 × 250 × 28	104	133	250	28	18	7,24	17,7	10,2	7 700	7,62	433	12 200	9,61	3 170	4,89	309
250 × 250 × 35	128	163	250	35	18	7,50	17,7	10,6	9 260	7,54	529	14 700	9,48	3 860	4,87	364

NOTES

1. Member countries may choose, to be included in their national standards, the sizes which are required to meet their demand.
2. For the angles so chosen, only thicknesses which can be rolled in their mills to meet the demand of the users may be selected from the list of thicknesses corresponding to equal angles in table 1.
3. The sectional area has been calculated using the formula

   S = [l/2 A - l) + 0,214 6 (r_root² - 2r_toe²)] × 1/100

   where
   

   S is the sectional area, in square centimetres;
   

   l is the thickness, in millimetres;
   

   r_root is the root radius, in millimetres;
   

   r_toe is the toe radius, in millimetres;
   

   A is the leg length, in millimetres.

4. Mass is calculated on the basis of density of steel of 7,85 kg/dm³.

   4