BS 8588:2017 pdf download.Polyethylene pressure pipe with an aluminium barrier layer and associated fittings for potable water supply in contaminated land — Size 20 mm to 630 mm.
BS 8588 specifies requirements for the materials, mechanical performance, dimensions, and effect on water quality of polyethylene pipes with an aluminium barrier layer, and associated fittings/joints for potable water supply installed in contaminated ground.
It is applicable to Type A and Type B pipes with nominal sizes up to and including 630 mm, with the following characteristics.
a) Type A: pipes where one or more polymer layers form a core pipe which is designed to bear the stresses associated with long term hydrostatic pressure. with the aluminium layer and outer polymer layer being barrier and protection layers respectively, and regarded as not bearing stresses arising from internal pressure.
b) Type B: pipes where one or more polymer layers and the aluminium layer bear the stresses associated with long term hydrostatic pressure.
NOTE See 4.2 for pressure classes.
BS 8588 also covers the requirements for fittings and joints, manufactured by system manufacturers or others for use with one or more barrier pipe systems.
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BS ISO 4065, Thermoplastic pipes — Universal wall thickness table
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4.1.3 The overall service (design) coefficient C shall be a minimum of 1.25 in accordance with BS EN ISO 12162.
NOTE 1 For Type A pipes, the design coefficient C should apply to the PE core pipe, less aluminium, adhesive and protection layers.
NOTE 2 For Type B pipes the design coefficient C should apply to the complete pipe including all layers.
4.2 Pipe pressure classification
For nominal sizes less than 63 mm, all pipes shall maintain a minimum wall thickness of 2.3 mm.
NOTE 1 For all nominal sizes 63 mm to 630 mm, preferred pressure ratings for different SDRs are given in Table 1.
NOTE 2 The SDR in each case should apply to the hydrostatic pressure bearing layers.
NOTE 3 See 85 EN ISO 21003 for further guidance on multilayer pipes.BS-8588-2017