BS 545:2006 pdf download – Ductile iron pipes, fittings, accessories and their joints for water pipelines — Requirements and test methods

BS 545:2006 pdf download – Ductile iron pipes, fittings, accessories and their joints for water pipelines — Requirements and test methods 4 Technical requirements 4.1 General 4.1.1 Ductile iron pipes and fittings Nominal sizes, thickness classes, lengths and coatings are specified in 4.1.1, 4.2.1, 4.2.3, 4.4 and 4.5 respectively.When, by agreement between manufacturer and purchaser, pipes and fittings with different wall thickness classes, lengths and/or coatings and other types of fittings than those given in 8.3 and 8.4, are supplied with reference to this standard, they shall comply with all the other requirements of this standard. NOTE 1 Other types of fittings include angle branches, tees and tapers with other combinations DN x dn, draining tees, … The standardized nominal sizes DN of pipes and fittings are as follows: (see EN 805) 40, 50, 60, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1 000, 1 100, 1 200, 1 400, 1 500, 1 600, 1 800, 2 000. The allowable pressures of ductile iron pipes and fittings shall be as given in Annex A. NOTE 2 Annexes B and C give respectively the longitudinal bending resistance and the diametral stifiness of ductle ironpipes. NOTE3 When installed and operated under the conditions for which they are designed (see Annexes D,E and G), ductleiron pipes, fttings, accessories and their joints maintain all their functional characteristics over their operating life, due to theconstant material properties, to the stability of their cross section and to their design with high safety factors. 4.1.2Surface condition and repair Pipes，fttings and accessories shall be free from defects and surface imperfections which can lead to non-compliance with Clause 4 and Clause 5. When necessary，pipes and fittings may be repaired，for example by welding，in order to remove surfaceimperfections and localized defects which do not extend through the entire wall thickness, provided that : — the repairs are carried out according to the manufacturer’s written procedure; – the repaired pipes and fittings comply with all the requirements of Clause 4 and Clause 5. 4.1.3Types of joints and interconnection 4.1.3.1 General Rubber gasket materials shall comply with the requirements of EN 681-1, type WA. When materials other thanrubber are necessary (e.g. for flanged joints), they shall comply with the appropriate European Standard or, whereno European Standard exists, the appropriate lnternational Standard. 4.1.3.2Flanged joints Flanges shall be constructed in such a way that they can...