1、BRITISH STANDARD Internal and/or external protective coatings for steel tubes - Specification for hot dip galvanized coatings applied in automatic plants The European Standard EN 10240 : 1997 has the status of a British Standard ICs 23.040.10; 25.220.40; 77.140.75 NO COPYING WITHOUT BSI PERMISSION E
2、XCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 10240:1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesBS EN 10240:1998 Amd. No. National foreword Date Text affected This British Standard is the English language version of EN 10240:1997. The UK participation in
3、 its preparation was entrusted to Technid Committee ISEY16, Protective coatings and linings of metal pipes and fittings, which has the responsibility to: This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the standard
4、s Board and comes into effect on 15 April 1998 O BSI 1998 The following BSI references relate to the work on this standard Committee reference ISW16 Draft for comment 94/340829 DC ISBN O 680 29626 7 - aid enquirers to understand the text; - present to the responsible European committee any enquiries
5、 on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. whilst this standard refers
6、 to hot dip galvanized coatings applied in automatic plants the denition given in 3.9 does not exclude hot dip gdvanizing produced in plants where tubes are hot dip galvanized and handled individually at withdrawal from the hot dip galvanizing bath using mechanical devices such as tongs. Cross-refer
7、ences The British standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitied “International Standards Correspondence Index“, or by using the Find facility of the BSI Stanards Electronic Catalogu
8、e. 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 compris
9、es a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services STD-BSI BS EN L02LiO-ENGL 1978 - Lb24bbl Ob7b72L Lb3 EUROPEAN STANDARD EN 10240 NORME EUROPENE EUROPmCXE NOM December 1
10、997 ICs 23.040.10; 25.220.40 77.140.75 Descriptors: Metal coatings, galvanizing, hot dip galvanizing, steel tubes, specifications, quality, thickness, adhesion, area, inspection, tests, mking English version Intemiall and/or externall protective cow for steel tubes - Specification for hot dip galvan
11、ized coatiqp applied in automatic Plants Revtements intrieur euou extrieur des tubes en acier - Spacations pour revtements de galvanisaon chaud sur des iignes automatiques Innere undoder b) other applications, e.g. scaffold tubes, sheturd hollow sections. NOTE 1 Subsequently in this European Standar
12、d, the term “tube” includes “hollow section”. NOTE 2 Hot dip galvanized coatings for steel tubes fabricated (see 3.10) subsequent to manufacture or hot dip galvanized in non-automatic plants are specified in prEN IS0 1461. Hot dip galvanized coatings for steel tube fittings and accessories are withi
13、n the scope of subcommittee ECISSmC 29/SC 3. 1.2 In addition to the requirements of this European Standard the general technical delivery requirements specified in EN 10021 apply 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publicati
14、ons. These nomative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. Fo
15、r undated references the latest edition of the publication referred to applies. EN 1179 EN 10021 EN 10204 EN 10232 EN 10233 prEN 10266l) EN IS0 1460 Zinc and zinc alloys - Prmry zinc Gwal technical delivery requirements for steel and iron products Metallic products - pes of inspection documts (inclu
16、ding amendment A1:1995) Melallic materials - Tube (in full section) -Bend test Metallic materials - %be - Steel tubes, fittings and structural hollow sections - Definitions and symbols for use in product standards Metduic coatings -Hot dip galvanized coatings on ferrous muterials - Gravimetric deter
17、mination of the mass per unit area Flattening test prEN IS0 14611) Hot dip galvanized coatings on fabricated ferrous products - Specification EN IS0 1463 EN IS0 9001 EN IS0 9002 IS0 2178 Page 3 EN lU24 until this document is published as a European Standard, a corresponding national standard should
18、be agreed at the time of enquiry and order. O BSI 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services STD-BSI BS EN 10240-ENGL 1998 W Lb2Libb9 Ub9b724 972 Page 4 EN 10240:1997 3.7 significant surface the whole of the inside andor outside surfaces of the tub
19、e depending upon the application, but excluding the end faces 3.8 reference area an area of significant surface within which a specified number of single measurements of coating thickness is to be made 3.9 automatic plant a plant in which tubes are hot dip galvanized and mechanically handled individ
20、ually at withdrawal from the hot dip galvanizing bath 3.10 fabricated manipulated, e.g. welded, bent, assembled 4 Designation of coating quality For the coatings specified in this European Standard, the quality designation shall consist of one of the following to identify the intended application of
21、 the tube: a) A for gas and water installations, including water intended for human consumption; b) B for other applications; followed by a full stop and a number to idenw the special requirements for that application (see 8.2.1 and table i), e.g. k3. 5 Information to be supplied by the purchaser 5.
22、1 Mandatory information The following information, when appropriate, shall be supplied by the purchaser to the galvanizer at the time of enquiry and order a) the number of this European standar b) the designation of coating quality (see clause 4); c) the product standard to which the tubes to be gal
23、vanized were manufactured 5.2 Options A number of options are permitted by this European Standard, and they are listed below with the appropriate clause references. Where the purchaser identifies an option he shall include it in his enquiry and order. In the event that the purchaser does not indicat
24、e his wish to implement an option, the galvanizer shall supply in accordance with the base specification 1) the minimum local coating thickness on the outside surface is specified This option applies to coating qualities Al, A2 and A3 only, and the purchaser shall indicate the minimum local coating
25、thickness required (see 8.2.1); 2) the chemical composition of the coating shall comply with 8.2.1 0. This option applies to coating qualities A2 and A3 onlx 3) the minimum local coating thickness required is in excess of 55 km. This option applies to coating qdty B.l only and the purchaser shall in
26、dicate the minimum coating thicknm required (see 8.2.2), e.g. as specified in prEN IS0 1461; 4) the type of post galvanizing treatment is specified. The purchaser shall indicate the type of post galvanking ireaiment required (see clause 12); 5) a post galvanizing treatment is precluded (see clause 1
27、2). 6 Hot dip galvanizing process 6.1 The galvanizer and the stockist, where products are supplied through a stockist, shall operate a quality system in accordance with EN IS0 9002. NOTE This requirement is also fuifilied by a quality system in accordance with EN IS0 9001. 6.2 The zinc added to the
28、galvaniziig bath shall contain a total of impurities (other than iron and tin) specified in EN 1179 not exceeduig 1,5 %. 7 General requirements of the coating NOTE The surface quality, thickness and adhesion of the coating may be influenced by the surface condition of the tubes to be coated (see ann
29、ex A). 7.1 Surface The coating on both the inside and outside surfaces shall be continuous, smooth and free from flux residues on the significant surface. NOTE White marks on the surface of the coating (commonly hown as “wet storage stain“) are permitted if the requirements for the coating thickness
30、 are met 7.2 Thickness The coating thickness on the signicant surface (mide and/or outside as applicable) shall comply with the requirements of the coating quality specified (see 8.2). NOTE Service life increases with increase in coating thickness, but thicker coatings are more susceptible to mechan
31、ical damage. 7.3 Adhesion When tested in accordance with 11.4.2 or 11.4.3 the coating shall show no evidence of flaking on the signicant surface. In addition the coating shall show no evidence of cracking on the sigruficant surface when subjected to the bend test. Flaking adjacent to cut faces or at
32、 the corners of square or rectangular tubes shall not be cause for rejection. O BSI 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services STD-BSI BS EN LZqO-ENGL 1998 W Lb24bb9 0bb725 809 8 Special requirements of the coating 8.1 All coatings have special req
33、uirements which are related to the application of the tube. These are detailed in the coating quaities specified in 8.2 one of which shall be specified by the purchaser in his enquiry and order (see 6.1). 8.2 Requirements of coating quality 8.2.1 Coating qualities, A.l, A.2 and A.3 a) the surface of
34、 the com on the inside surface shaJ1 be as smooth as can be achieved by steam blowing. NOTE 1 Steam blowing produces a smoother surface on tubes of outside diameter 21,3 mm up to and including 88,9 mm than on tubes of other sizes. NOTE 2 Some variations may occur in the surface condition of the coat
35、ing at the points where the tube is held whilst steam blowing and within 50 mm of the tube ends; b) the minimum local coating thickness on the inside surface shall be as specified in table 1; c) unless otherwise specified by the purchaser, the minimum local coating thickness on the outside surface i
36、s not controlled. Option 1 (see 6.2) : The minimum local coating thickness on the outside surface is specified; d) for coating quality Al the local coating thickness shall be as specified in table 1 at any point of the weld bead on the inside surface of welded tubes (see annex A); Page 6 EN 10240:19
37、97 e) the product of any post gdvanizing treatment, e.g. phosphatmg, shaU be water soluble to such a degree that its removal is ensured and no toxic elements remain on the inside surface after flushing; f) for coating quaiity Al, and for coating qualities A2 and A3 when Option 2 is specified, the ch
38、emical composition of the coating shall not exceed the following: Antimony 0,01% ; Arsenic 0,02 % ; Cadmium 0,01% ; Bismuth 0,01%. Lead 0,8 % ; For antimony, arsenic, cadmium and bismuth the above requirements can alternatively, at the galvanizers option, be met by analysing a sample from the galvan
39、izing bath or by a certificate issued by the supplier of the zinc showing conformi with the maximum value specified for each element. Option 2 (see 6.2) : The chemical composition of the coating shall for coating qualities A2 and A3 not exceed the limits given above. 8.2.2 Coating qualities B.1, B.2
40、 and B.3 The minimum local coating thickness on the outside surface of the tube shaii be as specified in table 2. Thicker coatings than 55 Fm minimum may be achieved on some steels, and when required they shal be specified by the purchaser in the enquiry and order (see Option 3). Option 3 (see 5.2)
41、: For the coating quality B.l, a minimum local coating thickness in excess of 56 Fm is specified (see note in 7.2). Table 1 - Minimum local coating thickness and chemical composition requirements for coating qualities A.l, A.2 and A.3 O BSI 1998 COPYRIGHT European Committee for StandardizationLicens
42、ed by Information Handling ServicesPage 6 EN 10240:1997 Requirements Mandatory Minimum local coating thickness on the outside surface Table 2 - Minimum local coating thickness for coating qualities B.l, B.2 and B.3 Coating quality B.l B.2 B.3 55 pm 40 pm 25 pm 9 Inspection 9.1 General The coating sh
43、all be supplied with non-specific inspection and testing in accordance with EN 10021. A guideline for the frequency of inspection and testing of coating quality Al is given in annex D. 9.2 Inspection document The coating shall be supplied with a certiticate of compliance, 2.1, in accordance with EN
44、10204. 10 sampling 10.1 Types of inspection and tests Samples are required for the following inspection and tests: - visual examimion (see 10.2.1 and 11.1); - examination of the inside surface for coating quality Al for tubes with outside diametem 21,3 mm up to and including 88,9 mm (see 10.2.2 and
45、11.2); - local coating thickness (see 10.2.3 and 11.3); - adhesion test (see 10.2.4 and 11.4); - chemical analysis of the coating when coating quality Al or option 2 is specified (see 10.2.6 and 11.6). 10.2 Preparation of samples and test pieces 10.2.1 Vual examination The sample shall be the full l
46、ength of the tube. 10.2.2 Examination of the inside surfime for coating quulitu A.l Two test pieces each 1 metre in length shall be taken from the middle of the sample tube. 10.2.3 Local coating thickness 10.2.3.1 Test pieces for the magnetic method (see 11.3.1a) shall be selected in accordance with
47、 B.1.2. 10.2.3.2 Mo test pieces for the gravimetsic method, (see 11.3.1b) shall be taken from the tube. Each test piece shall have a significant surface of at least 0,3 dm2 but not greater than 6,O dm2 with a length of at least 50 mm but not greater than 150 mm, and shall be cut at random but at lea
48、st 600 mm from a tube end. NOTE The test pieces need not be full tube sections. 10.2.3.3 Test pieces for the metallographic verification of coating thickness at the welding seam (see 11.3.2) shall be cut kansverse to the longitudinal direction of the tube and include the welding seam. 10.2.4 Adhesio
49、n test 10.2.4.1 Test pieces for the fiattening test (see 11.4.2) shall be full tube sections not less than 40 mm in length, cut at random, but at least 50 mm from a tube end. 10.2.4.2 Test pieces for the bend test shall be full tube sections and of a length sufficient to produce a 90“ bend when tested in accordance with 11.4.3. 10.2.6 Chemical analusis The test piece size shall be at the discretion of the galvanizer but suitable for analysis. 11 Inspection and test methods 11.1 Visual examination The coating shall be visually inspected using only no
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1