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.
Definition of operative pipe outside diameter
Specified outside diameters might vary from the standard nominal diameters because of the different construction/design types. Details shall be provided by the pipe manufacturer in a technical data file.
For Type A pipes, the diameter of the core pipe shall correspond to the nominal diameter.
For Type B pipes the outside diameter shall correspond to the nominal diameter.
Type tests
General requirements
The core layer of Type A barrier pipes shall conform to the requirements of 85 EN 12201-2, as applicable.
NOTE 1 Users of this British Standard are advised to consider the desirability of third-party certification/inspectionltesting of product conformity with this British Standard. Appropriate conformity attestation arrangements are described in 85 EN ISOIIEC 17025. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask 851 to forward their requests to the relevant association.
For type tests, and unless otherwise stated in this standard, the smallest, largest, and one intermediate pipe size of each material classification in the manufacturer’s size range shall be tested, with the exception of the requirements in 7.3 for which one size shall be tested and in 7.7, for which the requirements are set out in Annex B.
The results of all the Type Tests in Clause 7 shall be provided by the pipe manufacturer in a technical data file in accordance with Annex C.
NOTE 2 The tests in this clause are designed to demonstrate that the pipe produced by the manufacturer has the same long term properties as the basic material compound. They are not required to be performed on each batch of pipe.
NOTE 3 Type tests and requirements are given in Table 5.
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.
Long-term hydrostatic pressure strength at 20 °C
Type A pipes
The core pipe shall conform to BS EN 12201-2.
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 85 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 85 EN ISO 9080. that the inner PE layer and aluminium have sufficient hydrostatic pressure strength at 20 C and at 50 years.
For both PE8O and PE100 based pipes, the pressure classification shall be the 97.5% LCL of the regression data.
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.BS 8588 pdf download.