AS NZS 4441:2017 pdf free download

AS NZS 4441:2017 pdf free download
AS NZS 4441:2017 pdf free download.Oriented PVC (PVC-O) pipes for pressure applications (ISO 16422:2014, MOD)
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.
7.1 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 7.3 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.
8.2 Calculation of wall thickness
The relationship between the nominal wall thickness en and the nominal outside diameter dn is specified in ISO 4065. The values for nominal pipe wall thickness en for nominal pressure ratings PN, can be calculated by substituting the values for MRS, C, and dn in the formula.