AS NZS 4441:2017 pdf free.Oriented PVC (PVC-O) pipes for pressure applications.
5 Material
5.1 General
The material from which the pipes are made shall be PVC-U compound/formulation. This compound/formulation shall consist substantially of PVC-U resin/powder to which shall be added only those additives necessary to facilitate the production of pipes and fittings in accordance with this International Standard. All additives shall be uniformly dispersed.
5.2 Rework material
The use of the manufacturer’s own reprocessed material, produced during the manufacture and works testing of products and conforming to the material requirements of this International Standard, is permitted. Reprocessed or recycled material obtained from external sources shall not be used.
6 Effect of materials on water quality
All plastics and non-plastic materials for components of the PVC piping system, e.g. pipes, fittings, valves, elastomeric sealing rings, solvent cement, and lubricants, when in permanent or in temporary contact with water which is intended for human consumption, shall not adversely affect the quality of the drinking water. Where applicable, all materials for components shall conform to the current national regulations concerning materials in contact with drinking water.
7 Material classification
7.1 MRS value
Oriented pipes made from a defined PVC-U compound and with a well-defined orientation level in circumferential and axial direction, shall be evaluated according to the procedures of Annex A. The minimum required strength (MRS) values shall be classified in accordance with 2 and Table 1.
7.2 Design coefficient
The design coefficient of oriented PVC-U pipes shall be a minimum of 1,6. Alternatively, 1,4 is permitted for MRS 450 and MRS 500, provided that axial contraction of the pipe (due to higher design stress) does not result in pull-out of the joints. In this case, evidence shall be given according to Annex B.
9 General requirements for pipes
9.1 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 which would prevent conformity with this International Standard. The material shall not contain visible impurities. The ends of the pipe shall be cut cleanly and square to the axis of the pipe.
9.2 Opacity
If a pipe is required to be opaque for use in above ground applications, the wall of the pipe shall not transmit more than 0,2 % of visible light falling on it when tested in accordance with Iso 7686.AS NZS 4441 pdf download.