BS EN 15711-2009 Vitreous and porcelain enamels — Glass lined flanged steel pipes and flanged steel fittings — Quality requirements.pdf
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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
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