BS EN 545:2006 pdf free.Ductile iron pipes,fittings, accessories andtheir joints for waterpipelines — Requirements and testmethods.
BS EN 545 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.
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 International Standard.
Flanges shall be constructed in such a way that they can be attached to flanges whose dimensions and tolerancescomply with EN 1092-2.This ensures interconnection between all flanged components (pipes , fttings, valves ..） fthe same PN and DN and adequate joint performance.
Bolts and nuts shall comply as a minimum with the requirements of EN ISO 4016 and EN ISO 4034, grade 4.6.When applicable, washers shall comply with EN ISO 7091.
Although it does not affect interconnection, the manufacturer shall state in his catalogues whether his products arenormally delivered with fixed flanges or adjustable flanges.
NOTE Flange gaskets can be one of those given in EN 1514.
Pipes and fittings with flexible joints shall comply with 4.2.2.1 for their spigot external diameter DE and theirtolerances.This offers the possibility of interconnection between components equipped with different types offlexible joints. In addition, each type of flexible joint shall be designed to fufil the performance requirements of Clause 5.
NOTE1 For interconnection with certain types of joints operating within a different tolerance range on DE, themanufacturer’s guidance should be followed as to the means of ensuring adequate joint performance at high pressures (e.g.measurement and selection of external diameter).
NOTE2 For interconnection with existing pipelines which can have external diameters not in compliance with 4.2.2.1, themanufacturer’s guidance should be followed as to the appropriate means of interconnection (e.g.adaptors).
Materials in contact with water intended for human consumption.Ductle iron pipes, fittings and their joints include several materials given in this standard. When used under theconditions for which they are designed，in permanent or in temporary contact with water intended for humanconsumption, ductle iron pipes fittings and their joints shall not change the quality of that water to such an extentthat it fails to comply with the requirements of national regulations.BS EN 545 pdf download.