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...