Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

Name Definition Visual Acceptance LevelsLack of filloutPimpleResin-pocketAn area, occurring usually at the edge ofa laminated plastic, where thereinforcement has not been wetted withresin.Small, sharp, or conical elevation of thesurface of a laminate.An apparent accumulation of excessresin in a small localized area within thelaminate.Maximum diameter, 9.5 mmMaximum diameter, 3.0 mmMaximum diameter, 6.5 mmWash Area where the reinforcement ofmoulded plastic has moved inadvertentlyduring closure of the mould resulting inresin-rich areas.Maximum diameter, 29 mmWormholeScratchElongated air entrapment which is eitherin or near the surface of a laminate andmay be covered by a thin film of curedresin.Shallow mark, groove, furrow, or channelcaused by improper handling or storage.Maximum diameter, 6.5 mmMaximum length, 25 mm,maximum depth, 0.255 mm9.6 CLASSIFICATION9.6.1 Five pressure classes of pipes namely, PN 3, PN 6, PN 9, PN 12 and PN 15correspond to the working pressure ratings of 300, 600, 900, 1200 and 1500kPa respectively.9.6.2 Lengths : Pipes shall be supplied in nominal lengths of 6m, 9m and 12m. Amaximum of 10 percent of the pipe section may be supplied in random lengths.9.7 SoundnessEach length of pipe and fittings of nominal diameter up to 1400 mm shallwithstand without leakage or cracking the internal hydrostatic test pressures asspecified in Table 16.2 for the applicable class when tested. For pipes ofnominal diameter above 1400 mm, the frequency of hydrostatic leak tests shallbe as agreed between the manufacturer and the purchaser.Urban Administration & Development Department Page 105