Supplementary Manual to Water Services

Transcription

1 Supplementary Manual to Water Services

2 VERSION CONTROL Issue Date Version Issue Issued To Prepared By Reviewed By 27/02/ General B Griffiths D Wharton 20/08/ General B Griffiths D Wharton 08/06/ Public N Campbell 26/05/ Public N Campbell

3 1 Purpose of document This document has been prepared for the instruction and guidance of planners, designers, constructors and developers of infrastructure projects for Flow. This document is a supplement to the following documents issued by the Water Services Association of Australia (WSAA): Water Supply Code of Australia WSA (Sydney Water Edition 2014) and; Pressure Sewerage Code of Australia WSA All planners, designers, constructors and developers of infrastructure projects for Flow, should be familiar with these two codes as they are the foundation documents. This supplement to these codes is intended to help ensure: Consistency across all developments for which Flow will be responsible for the operation and maintenance as the utility provider. Limit the number of requests for information (RFIs) received during the construction phase of the project. Clarify the responsibilities of all parties involved in delivering the project.

4 2 Precedence of documentation The following documents are listed in order of precedence for the design and construction of Flow infrastructure: Flow approved project drawings. Project specifications (where applicable). Flow adopted drawings listed in tables 4.1, 5.1, and 6.1 of this document. This document. WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014) and WSAA Pressure Sewerage Code of Australia WSA Other relevant Australian codes and standards. Other relevant international codes and standards. Documentation not nominated above, including relevant Australian and international codes where these are referenced, shall only be used after consultation with Flow and permission obtained in writing.

5 3 Scheme Creation a) The Planning stage is covered by the Bulk Water Servicing Strategy (BWSS) prepared by a nominated consultant. This includes: The review of previously prepared water strategies. Incorporation of water usage estimates, including sensitivity analysis, provided by Flow. Reaching agreement with the relevant water authority on lead in works for water supply required to service the development. Preparing a report and drawings to be used as the basis of the concept design. b) The Concept Design stage is covered by the reticulation master plans prepared by nominated consultants. This includes: Incorporating the findings and recommendations of the BWSS. Optioneering to demonstrate best value for money concept design where appropriate. Interim staging as nominated by Flow. Incorporation of stakeholder consultation inputs provided by Flow. All items listed as part of the Concept Design in WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014) and WSAA Pressure Sewerage Code of Australia WSA where not already identified above. c) The Detailed Design stage is covered by the detailed design drawings prepared by the developer nominated consultant. This includes: Incorporating the concept design principles. Incorporating the findings and recommendations of the reticulation master plans including interim staging requirements where applicable. Request review by concept designers when changes are made from the reticulation masterplans in staging sequence by developers. Request review by concept designers when changes are made from the reticulation masterplans to pipe sizing based on detail design requirements.

6 Production of Issued For Construction (IFC) drawings. Drawings shall be correctly georeferenced and that information needs to be supplied e.g. MGA z56 GDA94. The layers shall be separated and have logical naming conventions e.g. Water Pipe, Sewer, etc. Drawings must be consistent with the latest revision Flow standard drawings. Designers must consult with Flow and obtain written approval before deviating from Flow standards. All items listed as part of the Detail Design (including additional information not covered by the standard drawings) in the WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014) and WSAA Pressure Sewerage Code of Australia WSA where not already identified above. d) The Construction stage is the installation of the Detail Design by the developer nominated contractor approved by Flow. This includes: Adherence to the approved project drawings, unless altered through the RFI and design change process, and reference documentation as the listed order of precedence in Section 2 of this document. Adherence to the project approved inspection and test plan (ITPs) and relevant checklists Adherence to the installation guidelines and Flow standard drawings in for pressure sewerage. Testing of all reticulation and property service lines to the manual isolation valve in the property boundary kit at a pressure of 1600 kpa, and from the wastewater collection tank to the manual isolation valve of the property boundary kit at a pressure of 1000 kpa. All items listed as part of Construction in the WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014) and WSAA Pressure Sewerage Code of Australia WSA where not already identified above.

7 4 Variations to the WSA The Flow Standards for Planning, Design, and Construction shall follow the WSAA Pressure Sewerage Code of Australia WSA The variations to this code to meet the requirements of the Flow Standards and clarify any ambiguities are contained in Sections 4.2 to 4.6. Any reference to Water Agency in the WSAA Pressure Sewerage Code of Australia WSA shall be taken to mean Flow or its licensed subsidiaries. a) PART 0: GLOSSARY OR TERMS AND ABBREVIATIONS NO VARIATIONS b) PART 1: DESIGN Replace 1 GENERAL with Section 3 above of this document. Remove 2.13 COMMISSSIONING PLAN Additional paragraph to Odour and Septicity Control (2 CONCEPT DESIGN) The Designer shall provide detention time calculations and design adequate odour and septicity controls. The Designer shall ensure that the sulphide generation potential in pressure sewerage reticulation that discharges to standard manholes is kept to a level that is not likely to cause nuisance odour or have a detrimental effect on existing infrastructure. Replace words in Peak Flows from homes and required pumping rates with: All pool & spa installations require approval from Flow and the local council. Any properties with a swimming pool will not be permitted to drain their pool directly to the wastewater collection tank. The customer will be required to either: Install a system to ensure that discharge from the pool does not exceed the capacity of the pressure sewer pump well, e.g. storage; or Install a soakage pit to drain the pool to stormwater, local regulations permitting. Customers who install a pool after they have received a pressure sewer connection will not be permitted to drain their pool to their wastewater collection tank, and will be required to comply with local authority requirements. In cases where this is not possible, the customer will be required to install a system to ensure that discharge from the pool does not exceed the capacity of the pressure sewer pump well. Customers with a spa are to install a flow restrictor to the drain which ensures the discharge rate does not exceed 0.5L/s. This flow restrictor shall be installed by a licensed plumber. Additional paragraph to Alignment of pressure sewers: Pressure sewer mains shall wherever practicable be located on the same side of the road as recycled water mains to help facilitate the flushing of the pressure sewer by having recycled water hydrants adjacent to pressure sewer flushing points.

8 Emphasise underlined words contained in General 1st paragraph Isolation valves on pressure sewers shall be minimum PN16 and clockwise closing. Additional paragraph to Isolation valve locations: The requirement for project specific isolation valves shall be identified during detail design taking account of redundancy planning and proposed maintenance shut downs. These locations will be reviewed by Flow after incorporation into the detailed design taking account of any changes in the proposed staging. Replace words in Types with All air valves to be combination/dual air release and vacuum breaking automatic types incorporating a large and small orifice in a single unit. All air valves (above and below ground) to be installed with a suitably sized carbon filter. Additional paragraph to Locations: All air valves to be installed below ground in residential areas. Above ground air valves will only be permitted at a distance of >50m from the nearest property boundary. Replace words in General (5.6 PROVISION FOR CONDITION MONITORING, SAMPLING AND MAINTENANCE) with: The number and location of pressure monitoring, flow meters and sampling points shall be determined during the concept design stage and specified in the reticulation master plan. This will vary with each development and the concept designer will need to liaise with Flow on the design and type of fittings. Replace words in Flushing points and scours with: 3rd paragraph (c) at intervals not exceeding 250m. Additional paragraph to Flushing points and scours No Class A flushing point pits to be used. Class B pits to be used as a minimum; Class D pits to be used in trafficable areas in accordance with AS3996. Replace words in 5.8 Discharge Manholes with: Where the receiving sewer is substantially deeper than the normal depth of the pressure main the pressure main shall be graded out to enter the base of the receiving MH in such a way that it can discharge directly towards the downstream gravity pipe, thereby minimising disturbance to flows and the likelihood of creating odorous gases. If grading the pressure main out to enter the base of the MH is not practical an internal MH drop shall be designed in such a way that the flow is discharged directly towards the downstream gravity pipe as above. The minimum allowable distance for an internal MH drop is 600mm from the invert of the MH. Where required, venting shall be provided to the receiving sewer MH.

9 Internal exposed surfaces of the receiving structure shall be coated with epoxy lining conforming to the requirements of APAS Specification 0213 Coatings for Steel Used in Sewage Works and APAS Specification 0214 Coatings for Concrete Used in Sewage Works, as applicable. Protective coating specifications shall be confirmed with the water agency. The receiving structure shall be located as far as possible from residential properties. Properties connected to the receiving sewer shall be protected by a water seal (i.e. Boundary Trapped or Gas Check Maintenance Hole). Remove APPENDIX B SPECIFIC WATER AGENCY REQUIREMENTS c) PART 2: PRODUCTS AND MATERIALS Additional paragraph to Locations: All pipework for reticulation and property service lines shall be PE100 rated to a minimum PN16. PVC-M or PVC-O pipework may be used, at Flow discretion, for transfer lengths of the reticulation network without property connections. Ignore any reference to PE80B pipework. PE80B pipework is not permitted. Additional paragraph Polyethylene (PE) pipes and fittings: For supply and operational reasons Flow have limited the sizes of PN16 PE100 pipe within its pressure sewerage system to 40, 50, 63, 90, 110, 125, 160, 180, 280 and 315. PE dimensions refer to a nominal outside diameter. d) PART 3: CONSTRUCTION Additional paragraphs to 18.6 JOINTING: All PE joints to use electro-fusion (EF) welding or butt welding where EF not practicable. Compression joints are not permitted. Tees to be used for all lateral and flushing point connections, Saddle connections are only permitted where necessary to tap in after the system has been commissioned. Design and construction staging shall be planned to avoid this. Additional paragraph to General (24.1 PRESSURE TESTING): Testing of all reticulation and property lines shall be to the manual isolation valve of the property boundary assembly at a pressure of 1600 kpa, and from the wastewater collection tank to the manual isolation valve of the property boundary kit at a pressure of 1000 kpa.

10 e) PART 4 STANDARD DRAWINGS The WSAA Pressure Sewerage Standard Drawings have been supplemented with additional Flow drawings. These drawings address aspects not otherwise covered by the WSAA Pressure Sewer Standard Drawings. Supplementary drawings complement and in some instances, replace WSAA Pressure Sewer Standard Drawings. Supplementary drawings are differentiated from PSS or WAT drawings by number. Refer to Flow s table of standard drawings for developers. The WSA-07 drawings which have replaced by Flow drawings are as follows: PSS-1005 PSS-1006 PSS-1007 PSS-1100 PSS-1101 PSS-1102 No changes have been made to WAT series of drawings referenced in the WSAA Pressure Sewerage Code of Australia WSA and PSS-1000 through PSS-1004.

11 5 Variations to WSA (Sydney Water Edition 2014) The Flow Standards for Planning, Design, and Construction shall follow the WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014). The variations to this code to meet the requirements of the Flow Standards and clarify any ambiguities are contained in Sections 5.2 to 5.5. Any reference to Water Agency or Sydney Water in the WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014) shall be taken to mean Flow or its subsidiaries. a) PART 0: GLOSSARY OR TERMS AND ABBREVIATIONS NO VARIATIONS b) PART 1: DESIGN Replace 1 GENERAL with Section 3 above of the Flow Standards. Replace 2 WATER SYSTEM PLANNING GUIDELINE with Section 3 above of the Flow Standards. Additional paragraphs to 4.4 PVC PIPELINE SYSTEMS: All reticulation PVC pipework shall be PVC-M to a minimum PN16. Additional paragraphs to 4.5 PE PIPELINE SYSTEMS: All PE pipework for property service lines shall be PE100 rated to a minimum PN16. Ignore any reference to PE80B pipework. PE80B pipework is not permitted. Table 5.5 Section Clearance Requirements: Replace both horizontal clearance (600) and vertical clearance (300) with 150. Replace 1 st sentence of General (8.2 STOP VALVES) Isolation valves on drinking water and recycled water mains shall be minimum PN16 and anti-clockwise closing. Additional paragraphs to General (8.2 STOP VALVES): Stop valves to be installed at the end of the line of each stage downstream of the flushing hydrant. Additional paragraphs to Hydrant siting principles: Recycled water hydrants are to be located adjacent to pressure sewer flushing points. Interim staging hydrants shall be located at the end of each reticulation pipeline. Additional paragraphs to Hydrant spacing: Hydrants to be spaced at a minimum of 250m

12 Additional paragraphs to Kerb markings: The style and location of kerb markings for each development to be agreed between the developer and their contractor but will generally follow that specified in the WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014). Replace words in SW 8.12 SAMPLING POINTS ON DISTRIBUTION AND TRANSFER MAINS with: The number and location of pressure monitoring, flow meters and sampling points shall be determined during the concept design stage. This will vary with each development and the concept designer will need to liaise with Flow on the design and type of fittings. c) PART 2: CONSTRUCTION (INC PRODUCT AND MATERIALS) Additional paragraphs to General (12 PRODUCTS AND MATERIALS): All pipework for reticulation lines shall be PVC-M rated to a minimum PN16. All pipework for property service lines shall be PE100 rated to a minimum PN16. Additional paragraph to General (15 PIPE LAYING, JOINTING AND CONNECTING): For road crossings within the boundaries of the development where, for constructability reasons, there is a need to lay sleeve pipes/conduits before laying the actual product pipe use PVC DWV pipe 100NB SN8, 150NB and above SN10. Achieve a minimum annulus of 40mm between product pipe and sleeve pipe. Use straight lengths for the product pipe when feeding through the sleeve pipe (i.e. avoid coiled pipe). For major road crossings special designs are to be submitted to the relevant authorities for approval. d) PART 3: STANDARD DRAWINGS The WSAA Water Standard Drawings have been supplemented with additional Flow drawings. These drawings address aspects not otherwise covered by the WSAA Water Supply Standard Drawings. Supplementary drawings complement and in some instances, replace WSAA Water Supply Standard Drawings. Supplementary drawings are differentiated from PSS or WAT drawings by number. Refer to Flow s table of standard drawings for developers. The WSA-03 drawings which have replaced by Flow drawings are as follows: WAT-1854 WAT-1855

13 6 Flow on-lot infrastructure requirements The Flow Standards for Planning, Design, and Construction shall follow the WSAA Water Supply Code of Australia WSA (Sydney Water Edition 2014) and WSAA Pressure Sewerage Code of Australia WSA The following drawings which cover on-lot infrastructure requirements for pressure sewer, drinking water, and recycled water have been developed by Flow. These have been developed to provide: On-lot infrastructure minimum spacing requirements when wastewater collection tanks are located in the front or rear of the property. Staging requirements when wastewater collection tanks are located in the front or rear of the property. Electrical and instrumentation infrastructure requirements. Guidance on what work the developer, builder and Flow are responsible for carrying out. Refer to Flow s table of standard drawings for developers on-lot infrastructure requirements. Note: New drawings developed by Flow have the prefix FSI (Flow Systems Infrastructure).