NOTES FOR GUIDANCE ON THE - TII Publications

1 NOTES for GUIDANCE on the specification for road Works Series NG 2700 - Watermains, Utilities and Accommodation Works CC-GSW-02700 March 2011 Standards Construction & Commissioning CC TRANSPORT INFRASTRUCTURE IRELAND (TII) Publications About TII Transport Infrastructure Ireland (TII) is responsible for managing and improving the country s national road and light rail networks. About TII Publications TII maintains an online suite of technical Publications , which is managed through the TII Publications website. The contents of TII Publications is clearly split into Standards and Technical documentation.

2 All documentation for implementation on TII schemes is collectively referred to as TII Publications (Standards), and all other documentation within the system is collectively referred to as TII Publications (Technical). This system replaces the NRA Design Manual for Roads and Bridges (NRA DMRB) and the NRA Manual of Contract Documents for road Works (NRA MCDRW). Document Attributes Each document within TII Publications has a range of attributes associated with it, which allows for efficient access and retrieval of the document from the website. These attributes are also contained on the inside cover of each current document, for reference.

3 For migration of documents from the NRA and RPA to the new system, each current document was assigned with new outer front and rear covers. Apart from the covers, and inside cover pages, the documents contain the same information as previously within the NRA or RPA systems, including historical references such as those contained within NRA DMRB and NRA MCDRW. Document Attributes TII publication Title NOTES for GUIDANCE on the specification for road Works Series NG 2700 - Watermains, Utilities and Accommodation Works TII publication Number CC-GSW-02700 Activity Construction & Commissioning (CC) Document Set Standards Stream GUIDANCE on specification for Works (GSW) publication Date March 2011 Document Number 02700 Historical Reference Series NG 2700 NRA DMRB and MCDRW References For all documents that existed within the NRA DMRB or the NRA MCDRW prior to the launch of TII Publications , the NRA document reference used previously is listed above under historical reference.

4 The TII publication Number also shown above now supersedes this historical reference. All historical references within this document are deemed to be replaced by the TII publication Number. For the equivalent TII publication Number for all other historical references contained within this document, please refer to the TII Publications website. Volume 2 Series NG 2700 NOTES for GUIDANCE on the specification for road Works Watermains, Utilities And Accommodation Works March 2011 1 WATERMAINS, UTILITIES AND ACCOMMODATION WORKS Contents Clause Title Page NG 2701 Watermains General .. 2 NG 2702 Liaison with the Water Services Authority .. 2 NG 2703 Materials Pipework.

5 2 NG 2704 Materials Valves & 2 NG 2707 Excavation, Bedding, Laying, Surrounding and Backfilling .. 2 NG 2708 Testing .. 2 NG 2709 Swabbing, Disinfection and Flushing .. 3 NG Sample Appendices .. 4 Volume 2 Series NG 2700 NOTES for GUIDANCE on the specification for road Works Watermains, Utilities And Accommodation Works March 2011 2 Watermains, Utilities and Accommodation Works NG 2701 Watermains General 1 These NOTES for GUIDANCE provide background to the requirements in the specification where this is considered necessary. The information required from the designer/compiler is detailed in Appendix 27/1. 2 Details of the required works for owners of utilities (other than watermains) and accommodation works should be included in the relevant Appendix of Series 100.

6 NG 2702 Liaison with the Water Services Authority 1 Consultation with the relevant Local Authority, Water Services Authority or Group Water Scheme is of critical importance in the specification of materials, fittings, testing and disinfection of watermains in order to ensure consistency with the existing water distribution network. 2 All aspects of the specification should be in accordance with the specific requirements of the relevant Water Services Authority and a representative from the relevant Water Services Authority should be invited to be present for all critical works, testing, disinfection, residual chlorine testing and bacteriological testing.

7 3 Where Local Authority Bye-Laws are in place regarding the supply of drinking water the designer should comply with these requirements. 4 Due to the potential to contaminate public water supplies the compiler, in consultation with the relevant Water Services Authority, should consider requiring the Contactor s staff to undergo a medical examination to establish that they are not carriers of pathogenic diseases. For further GUIDANCE refer to UK Civil Engineering specification for the Water Industry (CESWI) published by WRc plc. NG 2703 Materials Pipework 1 Where materials other than those listed in the specification are required to be used by the relevant Local Authority a schedule should be included in Appendix 27/1.

8 2 The Complier shall ensure that all materials and fittings to be used on site have been approved for use by the relevant Water Services Authority. 3 Where aggressive soil conditions are encountered consideration should be given to the use of more resistant pipe materials polyethelene, HDPE or MDPE, or the specification of additional external protection. 4 Where aggressive soils are encountered ductile iron fittings and valves shall be wrapped, after fitting, with a non-woven, synthetic fibre, fabric, tape impregnated with a neutral compound based on saturated petroleum hydrocarbons and inert siliceous fillers.

9 The wrapping shall have a 55% overlap, extend a minimum of 50mm onto the pipe barrel protection and end laps between adjoining rolls shall be a minimum of 150mm. Alternatively for push fit fittings purpose made plastic muffs to suit the fitting size and type may be used and held in place with plastic chainlock strapping all installed in accordance with the fitting manufacturer s instructions. NG 2704 Materials Valves & Fittings 1 The type of hydrant proposed shall be in accordance with the requirements of the relevant Local Authority and Fire Service.

10 NG 2707 Excavation, Bedding, Laying, Surrounding and Backfilling 1 For further details on the requirements for thrust blocks refer to CIRIA Report 128 Guide to the Design of Thrust Blocks for Buried Pressure Pipelines. NG 2708 Testing 1 Where test pressures other than those required under IS EN 805 are required these should be scheduled in Appendix 27/1. 2 The maximum acceptable pressure loss is to be calculated from IS EN 805 by the compiler and specified in Appendix 27/1. 3 For further details of testing of polyethene pipes refer to A Guide to Testing of Water Volume 2 Series NG 2700 NOTES for GUIDANCE on the specification for road Works Watermains, Utilities And Accommodation Works March 2011 3 Supply Pipelines and Sewer Rising Mains published by WRc.