BS 8588-2017 pdf free 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.
7.2 Appearance When viewed without magnification, the internal and external surfaces of the pipe shall be smooth, clean and free from scoring, cavities and other surface defects.
7.3 Long-term hydrostatic pressure strength at 20 ºC
7.3.1 Type A pipes The core pipe shall conform to BS EN 12201-2.
7.3.2 Type B pipes The long term pressure strength of the composite pipe (all layers) shall be determined at 20 °C using the specifications given in BS EN ISO 9080 by pressure regression testing. Pipes shall meet the appropriate pressure classification given in Table 1. All layers of the composite pipe in Type B pipes are stress bearing, but only the outer PE layer can be affected by ground contamination. It shall therefore be demonstrated, by regression testing and using the guidance given in BS EN ISO 9080, that the inner PE layer and aluminium have sufficient hydrostatic pressure strength at 20 °C and at 50 years. For both PE80 and PE100 based pipes, the pressure classification shall be the 97.5% LCL of the regression data.
7.4 Resistance to delamination of pipe layers A delamination test shall be carried out in accordance with ISO 17454.
NOTE 1 Where the capacity of the tensile testing machine is insufficient to remove all of the circumferentially peeled layers in one continuous strip, the manufacturer may carry out a series of tests on adjacent strips so that the entire circumference is tested for delamination resistance.
NOTE 2 For Type A pipes, the outer protective PE and aluminium layers may be removed as one from the core pipe. For Type B pipes, the complete pipe shall be tested and the calibration force determined accordingly. A failure shall be recorded if any voids or localized disbonding of greater than 10% of the sample length are noted during sample testing. Otherwise, the measured and calculated forces shall be recorded in the technical data file. The manufacturer shall carry out quality control testing to demonstrate that the delamination resistance of the product is at least equal to that stated in the Technical data file.
7.5 Long term performance of pipe subjected to squeeze-off
7.5.1 When squeezed-off in accordance with BS EN 12106, the time to failure in a hydrostatic stress rupture test at 80 °C with stress levels of 4.6 MPa (PE 80) and 5.5 MPa (PE 100) shall be not less than 165 h. NOTE Where the manufacturer states that the use of squeeze-off is not advised with their system, this test does not need to be undertaken.
7.5.2 The manufacturer shall detail in the technical data file, the method of squeeze-off and any protective measures and marking that are required.
7.6 Fusion welding of coiled pipe (sizes above 63 mm diameter) 7.6.1 The pipe manufacturer shall confirm that coiled pipes with the smallest coil radius can be satisfactorily re-rounded, in the technical data file.
NOTE Where the manufacturer states in the technical data file that the pipe system is not suitable for fusion jointing in accordance with Clause 11, this test does not need to be undertaken.
7.6.2 Compliance with this requirement shall be demonstrated by a test using the manufacturer’s largest coiled pipe size, in SDR 17. Both butt fusion and electrofusion joints 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 leachate samples taken 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 blank/reference 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 blank/reference sample, providing the third panellist does not detect a flavour in the second dilution; and
c) the concentration of dissolved hydrocarbons in the undiluted leachate sample is not greater than 100 µg/l.
7.7.2 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 leachate 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 leachate sample is greater than 100 µg/l;
d) any of the control sample set passes the criteria set out in 7.7.1a) and 7.7.1b).
NOTE 1 A set of samples comprises three odour and flavour samples and one dissolved hydrocarbon sample. NOTE 2 The set of reference samples should only be used when it is necessary to check whether the pipe and/or fitting is suspected of affecting the result.BS 8588 pdf download