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1、? ? ? ? ? ?!? ?“?!?#?$!?!? %!? collapsed lines in the cover coat; bubble lines i.e. fused in bubbles arranged in a distinct line fused strain lines; areas not properly fused (in case of vitreous enamel recognizable for the carborundum-like rough surface); pull-through of ground coat; depressions exc
2、eeding more than 25 % of the coating thickness; areas with weak spots or defects as detected when tested in accordance with 6.4.2; particles of fireclay. 5.2.3 Foreign matter in the enamel Tinder particles may appear if none of their dimensions in any direction and parallel to the component part sur
3、face are greater than 3 mm and provided they are laminar in shape and melted into the enamel parallel to the surface of the steel part concerned. 5.2.4 Enamel coating thickness Coating thickness shall be 0,8 mm to 2,0 mm, except: a) if the transition to the thickened layer is gradual, the layer thic
4、kness may be exceeded by 0,2 mm, however, the enamel layer on convex areas shall not be thicker than on the surrounding areas; b) for components which have a very small radius of curvature, the minimum coating thickness may be 0,6 mm. 5.2.5 Dimensions and tolerances The dimensions and their toleranc
5、es shall be in accordance with DIN 2873. 5.2.6 Other requirements The facings of the necks shall be protected by a protective cap. Thickness at the bottom of the cap shall protect the facing. ? BS EN 15711:2009 EN 15711:2009 (E) 7 6 Tests and certificates 6.1 General Flanged pipes and flanged fittin
6、gs in accordance with this European Standard shall be supplied with a test report “type 2.2“ in accordance with EN 10204. In addition, the contracting parties may agree upon a materials testing certificate in accordance with EN 10204. 6.2 Place of testing The components shall be tested at the produc
7、tion plant. 6.3 Testing of the substrate The primary materials shall be tested in accordance with EN 13480-2. The materials testing certificates required for the primary materials shall be specified in the order. 6.4 Testing of the glass lined components 6.4.1 The exterior condition of all glass lin
8、ed components shall be checked by visual inspection, for which the enamel surfaces shall be clean. 6.4.2 High-voltage test High voltage tests shall be carried out in accordance with EN 14430. A preliminary test shall be carried out by the manufacturer using a test voltage of 20 kV and an acceptance
9、test shall be carried out using a test voltage of 12 kV. 6.4.3 Coating thickness measurement A device with an uncertainty of ? 5 % shall be used for measuring the coating thickness. The area to be tested shall be measured at spots chosen at random. In addition, critical areas, e.g. small radii of cu
10、rvature at cross- sectional transitions, areas of unevenness and local swellings, shall be measured. 6.4.4 Chemical corrosion test The resistance of the enamel shall be tested only once in accordance with EN 14483-2, EN 14483-4 or EN 14483-5. 7 Marking All flanged pipes and flanged fittings shall be
11、 marked permanently and clearly with the following: manufacturers mark; inner diameter; EN 15711. ? BS EN 15711:2009 EN 15711:2009 (E) 8 If delivery is made with an inspection certificate in accordance with EN 10204, the following shall also be given: cast number or short symbol; signature of the in
12、spector. The marking shall be permanently legible. NOTE Suitable marking methods are for example embossing and laser marking. ? BS EN 15711:2009 This page has been intentionally left blank ? ? ? ? ? ? ?!“?#?$?% ? ? ?.?.?;?.5?!?69?$?9?.?5 ? ?69?7?7?;?5?+?:? ?.?7?“?9?.?7?7? ?5 ?!?7?:?7?;?.?9?:?!?;?!?5
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