BS EN 14628-1:2020 pdf free.Ductile iron pipes, fittings and accessories -Requirements and test methods.
BS EN 14628-1 The impact energy to be applied shall be 5 J per millimetre of minimum coating thickness for DN > 200.This figure shall be reduced by 15 % for DN≤200 in order to account for their increased radius of curvature.The minimum distance between two impact points shall be 30 mm.Care shall be taken to ensure that the impact energy is maintained at a constant level by ensuring that little or no friction is encountered when the falling weight is dropped. Any punctures shall be detected immediately after impact by applying a test voltage of 25 kV (in accordance with 7.3).For reasons of statistical accuracy, a sufficient number of impacts shall be carried out until the number of electrical punctures falls into either range A or range C given in Figure 2. If the number of punctures falls into range B (see Figure 2), the test shall be continued accordingly until either range A (passed) or range C (failed) is reached.The test is to be carried out on the peeled-off and adhesive-free PE-layer with max.2 mm thickness, if necessary by grinding off the underside. The test is to be carried out on five specimens taken from different pipes. If one of the specimens fails to satisfy the requirements, the test is to be repeated on ten additional specimens taken from ten different pipes, in which case none of the specimens may fail.The test apparatus consists of a 250 g metal bar which can receive an additional weight. A metal pin with a smooth end face measuring 1,8 mm in diameter (2,5 mm2 of punch area) shall be attached centrically to the bottom end of the bar. The total weight shall be 2,5 kg which equates to a pressure of 10 N/mm2. A penetrometer comprising a dial gauge with an accuracy of 0,05 mm is required. The test shall be carried out at a temperature of [23土2) °C. After a temperature stabilization period of one hour, the punch without additional weight shall be slowly and carefully placed on the specimen and the zero value determined within 5 s. The additional weight shall subsequently be applied slowly and carefully. The depth of penetration (indentation depth) shall be measured on the penetrometer scale to within 0,05 mm after a loading period of 24 h.BS EN 14628-1 pdf download.