Appendix A: Acceptable pipe and fitting materials

Transcription

1 Watercare Services Limited Water and Code of Practice Content from the NZS 4404:2010 Land development and subdivision infrastructure has been reproduced for use in the Infrastructure Design s Manual for Local Networks with permission from s New Zealand under Licence Appendix A: Acceptable pipe and fitting materials Table A1 and table A2 on the following pages provides general information on acceptable pipe and fitting materials. Some of the information is sourced with permission from the Water Services Association of Australia, which is modified and supplemented by material from Watercare. Refer to Watercare for specifications on specific material type These tables are to be used as a guide only. December 2014 This is a controlled electronic document and is uncontrolled on printing Page 1 of 8

2 Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence Table A1 Acceptable pipe materials and s PVC-U AS/NZS 1260 (Solid wall Class SN 16 or as PVC-O AS/NZS 4441 (Series 1 or Series 2, as PVC-U AS/NZS 1477 (PN 12 or PN 16, as December 2014 This is a controlled electronic document and is uncontrolled on printing Page 2 of 8 Gravity applications only. Well established methods of repair. Can be used for trenchless installations with suitable load resistant joints Improved fracture toughness compared to PVC-U. Improved fatigue resistance compared to PVC-U and PVC- M. NOTE Use only DI fittings in pumped mains to achieve full fatigue resistance. Has increased hydraulic capacity compared with PVC-U and PVC-M. Suitable for aggressive groundwater, anaerobic conditions and tidal pressure applications. Well established methods of repair. Alternative installation techniques possible, e.g. slip lining. Suitable for aggressive groundwater, anaerobic conditions and tidal Can be used for trenchless installation with suitable end load resisting joints. pressure applications.

3 Table A1 Acceptable pipe materials and s (continued) Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence PVC-M AS/NZS 4765 (Class SN as Watercare PE AS/NZS 4130 AS/NZS 4131 (PE 80B SDR 11 or PE 100 SDR 13.6 or as NOTE: All PE pipes 63 mm OD are to be PE 80B. December 2014 This is a controlled electronic document and is uncontrolled on printing Page 3 of 8 Improved fracture toughness compared to PVC-U. Has increased hydraulic capacity compared with PVC-U. Inferior fatigue resistance compared to PVC-U and PVC-O. pressure applications. Generally for pressure applications. Can be easily curved to eliminate the need for bends. Alternative installation techniques, e.g. pipe cracking, directional drilling and slip lining. Can be welded to form an end load resistant system. Compression couplings and end load resistant fittings are available in smaller diameters. Pipe longitudinal flexibility accommodates large differential ground settlement. Fusion jointing requires skilled installers and special equipment. Retrospective installation of fittings / repair complicated. pressure sewer applications. DN 125 are available in long coiled lengths for fewer joints. Suitable for ground with high subsidence potential, e.g. fill or mining areas.

4 Table A1 Acceptable pipe materials and s (continued) Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence PE AS/NZS 5065 (Stiffness Class SN 16, SDR 17, or as PP AS/NZS 5065 (Stiffness Class SN 16, as - GRP AS December 2014 This is a controlled electronic document and is uncontrolled on printing Page 4 of 8 Only for gravity applications. Can be easily curved. Alternative installation techniques possible, e.g. pipe cracking and slip lining. Can be welded to form an end load resistant system. Fusion jointing requires skilled installers and special equipment. Retrospective installation of fittings / repair complicated. Smaller diameters available in long coiled lengths for fewer joints. Only for gravity applications. Alternative installation techniques possible, e.g. slip lining. UV resistant (special product). Custom made fittings can be manufactured. Suitable for use without additional corrosion protection in areas where stray electrical currents occur. Low impact resistance and ease of damage to thermosetting resin makes GRP susceptible to damage during transportation and installation in above ground installations, from vandalism or when damaged as a consequence of nearby excavation.

5 Table A1 Acceptable pipe materials and s (continued) Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence GRP AS VC BS EN RRJRC (Rubber ring jointed reinforced concrete) AS/NZS 4058 December 2014 This is a controlled electronic document and is uncontrolled on printing Page 5 of 8 Alternative installation techniques possible, e.g. slip lining. UV resistant (special product). Custom made fittings can be manufactured. Suitable for use without additional corrosion protection in areas where stray electrical currents occur. Low impact resistance and ease of damage to thermosetting resin makes GRP susceptible to damage during transportation and installation in above ground installations, from vandalism or when damaged as a consequence of nearby excavation. Gravity applications only Has benefits for particularly aggressive industrial wastes. Not recommended for active seismic (earthquake) zones or unstable ground. Requires protection from hydrogen sulphide attack in sewer applications by plastic lining or selection of appropriate cement additives.

6 Table A1 Acceptable pipe materials and s (continued) Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence CLS (SCL) NZS 4442 AS 1579 (Cement mortar lined welded steel, minimum thickness 4.8 mm) December 2014 This is a controlled electronic document and is uncontrolled on printing Page 6 of 8 Cement mortar lined, PE coating below ground or heavy duty coating above ground. High mechanical strength and toughness. Available in long lengths. RRJ welded joints are available. Custom made, specially configured steel fittings can be made to order. Can be welded to form a system that will resist end load and joint permeation. UV resistant / vandal proof / impact resistant (where PE coated). Cathodic protection (CP) can be applied to electrically continuous pipelines to provide enhanced corrosion protection. PE lined and coated RRJ. As above for CLS (SCL). Suitable for conveying soft water. Corrosion resistant under all conditions. General notes: Portland cement is not resistant to H 2S attack at any high points or discharge points in the main. High alumina cement has improved resistance. Welded joints require skilled installers and special equipment. Welded joints require reinstatement of protection system on site. Special design required for welded installations parallel and adjacent to high voltage ( 66kV) transmission lines. Cathodic protection requires regular monitoring and maintenance. Seal coating may be required over cement mortar linings when conveying soft water or in low flow extremities of reticulation mains, to prevent potentially high ph. Suitable for high load applications, such as railway crossings and major roads. Large diameters are available. Suitable for aerial or suspended pipeline applications.

7 Table A1 Acceptable pipe materials and s (continued) Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence DI AS/NZS 2280 ABS PVC-U AS 3681 (Ductile iron pipe K9 or PN 35) AS/NZS 3518 AS/NZS 3690 AS/NZS 3879 AS/NZS 1260 December 2014 This is a controlled electronic document and is uncontrolled on printing Page 7 of 8 Fatigue analysis not normally required (pressure sewer application). High mechanical strength and toughness. Ease of jointing. UV resistant / vandal proof / impact resistant. Well established methods of repair. Suitable for high pressure and above ground pipelines. Restrained joint systems available. Sufficient ring stiffness not to rely on side support for structural adequacy for the usual water supply installation depths. Elevated ph may occur when conveying soft water or in low flow extremities of reticulation mains. PE sleeving is required and must be carefully applied and repaired when damaged. Portland cement mortar is not resistant to H 2S attack at any high points or discharge points in the main. High alumina cement has improved resistance. Not suitable for aggressive ground water, anaerobic conditions or tidal pressure sewer applications. Gravity applications only.

8 Table A2 Acceptable fitting materials and s Content from the NZS 4404:2010 Land development and subdivision infrastructure Local Networks with permission from s New Zealand under Licence Fitting materials PE AS/NZS 4129 Access covers and grates AS 3996 Ductile iron AS/NZS 2280 Ductile iron unrestrained mechanical couplings AS/NZS 4998 Metallic tapping bands AS/NZS 4793 (No plastic bands accepted) Fire hydrants NZS Resilient seated gate AS valves PE AS/NZS 5065 (Stiffness Class SN16, or as PP AS/NZS 5065 (Stiffness Class SN16, or as December 2014 This is a controlled electronic document and is uncontrolled on printing Page 8 of 8 PE pressure fittings, including mechanical compression, butt fusion or electrofusion, as approved by Watercare. Generally for pressure applications. Shall be coated with a polymeric coating, applied in accordance with AS/NZS Generally for pressure applications. Shall be coated with a polymeric coating, applied in accordance with AS/NZS Generally for pressure applications. Tapping bands used on flexible pipes shall be AS/NZS 4793 Type F that is full circle design. LG2 gunmetal tapping bands preferred for all applications. Ductile iron tapping bands shall be coated with polymeric coating, applied in accordance with AS/NZS Generally pressure applications. Gravity application only. Gravity applications only.