BS 8558-2015 pdf free download

BS 8558-2015 pdf free download.Guide to the design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages — Complementary guidance to BS EN 806.
4.3.2 Water mains
Full information about proposals should be supplied as early as possible to the water supplier. Site plans should be supplied showing the layout of roads, footpaths, buildings and boundaries. The work programme should provide for the water supplier not laying a main until at least the line and level of the kerb are permanently established on site.
4.3.3 Ground movement
4.3.3.1 Ground movement can occur due to underground mining operations, natural movements of the earth’s strata or movement of superficial deposits. These movements can occur in both the horizontal and vertical planes, and vary in magnitude over the affected area. The effects of undermining can be predicted with reasonable accuracy by an appropriately qualified professional, such as a surveyor or geotechnical engineer, who should be consulted for advice on the adoption of precautionary measures. Movement of superficial deposits can be due to seasonal swelling and shrinkage, settlement (especially where fibrous organic soils are encountered) or slope stability failures. To enable an assessment of likely ground movement, a site investigation should be conducted to determine the ground conditions existing along the line of a proposed construction.
4.3.3.2 The extent of movements of superficial deposits can only be assessed by consideration of the findings of a site investigation. Where ground or groundwater level can move, a suitable type of flexible pipework should, where practicable, be “snaked” or undulated in the trench to accommodate movement, Where the pipes or the joints are not sufficiently flexible to accommodate movement in pipelines laid in recently disturbed ground, continuous longitudinal support should be provided.
4.3.3.3 When selecting the type of pipe or storage cistern, components of brittle materials should be more carefully protected from movement than inherently flexible materials.
4.3.3.4 Telescopic joints may be used to provide for thermal movement in pipelines. Angular deflections should be compensated for by using flexible type joints. The continuity of gradient towards washouts and air valves can be affected by subsidence. Where such a situation could occur, pipelines should be supported and reasonable gradients between high and low points on the pipeline should be ensured. Pipes passing through walls should be free to deflect.BS 8558-2015 pdf free download.