BS 7291-1:2010 pdf download – Thermoplastics pipe and fitting systems for hot and cold water for domestic purposes and heating installations in buildings Part 1 : General requirements
6.3 Hydrostatic pressure resistance of assembled pipes and fittings When fittings are tested in accordance with Annex B, there shall be no rupturing or cracking throughout the wall thickness of the test piece at any point, or leakage at any associated joint under test, and: a) the time to failure at 20 ºC and 20 bar pressure shall be not less than 1 000 h;
b) the time to failure at 95 °C and 10 bar pressure shall be not less than 1 000 h.
6.4 Resistance to thermal cycling of assembled pipes and fittings When tested in accordance with Annex C, there shall be no leakage from pipes, fittings or joints during or at the end of testing. NOTE The test in Annex Cmaybe used to confirm compatibilityof thermoplastics pipes and fittings with copperpipes and compression fittings conforming to BS EN 1057 and/orBS EN 1254-2 and/orBS EN 1254-3. In this case, the test is performed with copper pipes and thermoplastics fittings using the assembly shown in Figure C.1 and with thermoplastics pipes and compression fittings using the assembly shown in Figure C.2 This is not a requirement ofBS 7291:2010 and is included as an optional procedure to provide evidence ofcompliance with the regulators’ specification for water fittings requirements.
6.5 Resistance to cyclic pressure shock of assembled pipes and fittings When tested in accordance with Annex D, there shall be no leakage from pipes, fittings or joints.
6.6 Opacity When determined in accordance with BS EN ISO 7686, the percentage of light passing through the wall of the pipe or fitting shall not exceed 0.2%. In the case of pipe supplied in a protective sleeve, this requirement shall relate to the performance of the combination of both pipe and sleeve. To ensure conformity, the combination of pipe and sleeve shall not depend upon subsequent assembly of pipe and sleeve.
6.7 Oxygen permeability of multilayer oxygen barrier pipes When multilayer oxygen barrier pipes are tested in accordance with BS ISO 17455:2005, Method I, at a temperature of 80 °C and with four connecting fittings of the system under test, the oxygen permeability shall be ≤3.6 mg/m 2 .day.
6.8 Conditions constituting a change of material If any of the characteristics in Table 3 are changed, or any level exceeds the band, the product shall be retested in accordance with this part of BS 7291 and BS 7291-2 (polybutylene) or BS 7291-3 (cross-linked polyethylene), as applicable.
7 Intermediate layers of multilayer pipes Any intermediate layers shall include only layers made of polymers; no metal layers shall be used.
8 Marking and associated information
8.1 Each pipe shall be marked in accordance with BS 7291-2:2010, 6.1, or BS 7291-3:2010, 6.1, as applicable.
8.2 Each fitting shall be marked in accordance with BS 7291-2:2010, 6.2, or BS 7291-3:2010, 6.2.
8.3 The marking specified in BS 7291-2:2010, Clause 6, and BS 7291-3:2010, Clause 6, shall contrast clearly with the colour of the pipe, fitting or label, as applicable. It shall remain legible under handling, storage and installation conditions in accordance with BS 5955-8. Marking by indentation shall be to a depth not greater than 0.15 mm. There shall be no spaces greater than 0.5 m in length between each block of text.
8.4 If additional markings include a pressure rating that does not comprise an integer value, the mantissa shall be presented as a fraction, e.g. 3½ (see Table 1).
8.5 The nominal size of a fitting or of each individual socket thereon shall be designated by the nominal size of the pipe(s) with which it is to be used. The method of designating the fitting shall be as follows, depending on the type of fitting.
a) Straight fittings and bends. For fittings having two unequal ends,the larger end shall be given first, e.g. 20 × 16.