BS 8588:2017 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.
1 Scope
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 flttingsl)oints for potable water supply Installed In contaminated ground.
It Ii 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 wh,ch 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 stresies 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.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edation cited applies. For undated references, the latest edition of the referenced documents (incluthng any amendments) applies.
BS 5252. Framework for colour co-ordination for building purposes
BS 6920-2.2,1, Suitability of non-metallic products in contact with water intended for human consumption with regard to their effect on the quality of the water – Part 2- Methods of test – Section 2.1 — Odour and flavour of water for hoses composite pipes and tubes
BS 6920-2.2.2, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 2— Methods of test. Section 2.2— Odour and flavour of water – Method of testing odours and flavours imparted to water by multi-layered hoses and pipes
BS 8561, Specification for mechanical fittings for use in the repair; connection and renovation of pressurized water supply pipebnes – Requirements and test methods
BS EN 805, Water supply – Requirements for systems and components outside buildings
BS EN 12106, Plastics piping systems – Polyethylene (P6) pipes – Test method for the resistance to internal pressure after application of squeeze-oft
BS EN 12201-1. Plastics piping systems for water supply — Polyethylene (P6) — Part 1: General
BS EN 12201-2, Plastics piping systems for water supply – Polyethylene (P6) – Part 2: Pipes
BS EN 12201-3. Plastics piping systems for water supply — Polyethylene (P6) — Part 3: Fittings
BS EN ISO 3126, Plastic piping systems – Plastics components – Determination of dimensions
3.1 Terms and definitions
For the purposes of this British Standard, the terms and definitions given m BS EN 805, ISO 1043-1 and the following apply.
3.1.1 barrier pipe
multi-layer pipe consisting of two polyethylene layers with an Intervening aluminium barrier layer that together provide the necessary strength and resistance to permeation
3,1,2 barrIer pipe system
compatible pipes and fittings used to convey or retain drinking water for buried use In contaminated land
31.3 blank sample
reference sample of the test water taken for comparative analysis
3.1.4 butt fusion joint (using heated tool)
joint made by beating the planed ends of pipes or spigot end fittings (the surfaces of whkh match) by holding them against a flat heating plate until the PE material reaches fusion temperature, removing the heating plate quickly and pushing the two softened ends against one another under pressure to form a fusion joint
3.1.5 coiled pipe
pipe estruded in a multilayer coiled configuration with the layers strapped together to provide a stable unit without a supporting centre core
3.1.6 composite pipe
complete multi-layer barrier pipe construction
3.1.7 compound
homogeneous misture of base polymer (PE) and additives NOTE For example, anti-oxidants, pigments, carbon black, and Uabthzems. ISOURCE: 85 EN 12201:2011, 31.231
3.1.8 contaminants
substances which might permeate through the pipe wall and/or infiltrate joints and affect the quality of the conveyed water
NOTE In the case of polyethylene, the most aggressive substances that are likely to be found In contaminated ground are hydrocarbon fuels. For the purpose of this speciftcation a standard fuel smuIant ASTM 04fl Fuel C is used as a model contaminant.
3.1.9 control piece
length of standard PE 80 or PE 100 pipe exposed to fuel during the permeation test
3.1.10 coupling
in-line connector supplied to connect one pipe to another, or pipework to equipment
3.1.11 core pipe
type A pipe without barrier layer and protective skin
5.2 Colour
5.2.1 The colour of the outer polyethylene layer for barrier pipes for potable water applications shall be light blue (for pipes with a PE8O core layer) within the range 18E51 to 18E53 in accordance with BS 5252.
5.2.2 The colour of Pt 100 pipes shall be dark blue for PE100, within the range 20044 to 20045. or 20E53 to 20E56 in accordance with 85 5252.
5.2.3 The pipes shall have identification stripes that indicate multilayer construction. The colour of the stripes shall be
brown 06C37. 06C39. 08C37 or 08C39 in accordance with BS 5252.
5.2.4 The carbon black used in the Pt layers shall have a primary particle size of 10 nni to 25 nm.
5.2.5 The carbon black content shall be 2% to 2.5% when measured in accordance with ISO 6964.
5.2.6 Pipes up to and including 180 mm nominal diameter shall have a minimum of four external longitudinal identification stripes equally spaced around the circumference.
52.7 Pipes above 180 mm nominal diameter shall have eight external longitudinal identification stripes equally spaced around the circumference.
6 Dimensions
6.1 Diameter and wall thickness
6.1.1 Type A pipes
Type A pipes shall have a Pt core diameter in accordance with ISO 161-1. The outside diameter and wall thickness shall be in accordance with
ISO 161-1 (diameters). OS ISO 4065 (universal wall thicknesses) and
ISO 11922-1 (tolerances), for the nominal sizes and the SDRs specified In Table 2, NOTE Type A pipes may have outside diameters of the composite pipe that differ from nominal diameters, The appropriate information shall be supphed by the manufacturer In the technical data file.
NOTE Where the manufacturer states in the technical data file that the pipe system Es not witabe for fusion jointing En accordance with Clause IL this test does not need to be undertaken.
7.62 Compliance with this requirement shall be demonstrated by a test using the manufacturers largest coiled pipe size, in SDR 17. Both butt fusion and electrofusion jornts shall be prepared and tested in accordance with ISO 13954.
7.7 Resistance to the permeation of contaminants
7.7.1 When tested in accordance with Annex B. the test piece shall be deemed satisfactory if the set of leathate samples talen from it meet the following criteria:
a) two or more test panellists detect no discernible odour in the diluted leachate samples when compared to the set taken from the blanklreference sample;
b) two or more test panellists detect no discernible flavour In the first 1:1 dilution of the diluted Leachate samples when compared to the blankireference sample, providing the third panellist does not detect a flavour in the second dilution; and
c) the concentration of dissolved hydrocarbons in the undiluted leactiate sample is not greater than 100 jigll.
7.72 The pipe, joints and fitting combinations shall not be suitable for use if any one of the following occur:
a) two or more panellists detect any discernible odour or flavour in the diluted leadiate sample when compared to the blank)reference sample;
b) any panellist detects a flavour in the second dilution of the diluted leachate sample;
c) the concentration of dissolved hydrocarbons In the undiluted Ieachate sample is greater than 100 igll;
d) any of the control sample set passes the criteria set out in 7.7.la) and 7.7.lb).
NOTE I A set of saniples comprises three odour and flavour samples and one dissolved hydrocarbon sample.
NOTE 2 The set of reference samples should enfr be used when it Is necessaly to check whether the pipe andlox fitting is suspected of affecting the result.