OMAN WASTEWATER SERVICES COMPANY S.A.O.C.

Haya water P.O. Box No. 1047 Postal Code 133 Al Khuwair Sultanate of Oman Tel No. (968) 24 693412 Fax No. (968) 24 601291 Web: www.hayawater.com.om

The content of this document material is a property of Haya Water. No part of this document in whole or in part, may be reproduced in any form, by photocopy, microfilm, scanning or any other means, or incorporated into any information retrieval system, electronic or mechanical, without the written permission of Haya water management.

Document Authority

Document Custodian Engineering Manager Saber Khalil

Document Approval General Manager Asset Management Nazrul Islam

Document Authority Chief Executive Officer Omar Al Wahaibi

Revision History

Revision No. 0 01 02

Reason (S) For Change Document Approved and issued To Incorporate Tender Board and Veolia Comments To incorporate latest changes as per current International standards.

Date 13/04/2006 01/06/2008 31/12/2010

Authorized By

Contents1. 2. 3 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 23. 24. 25 26. 27. 28. 29. 31. GENERAL .................................................................................................................................................... 1 CONCRETE PIPES AND FITTINGS........................................................................................................ 3 GLASS REINFORCED PLASTIC (GRP) PIPES AND FITTINGS ....................................................... 4 HDPE NON PRESSURE PIPE ............................................................................................................... 13 HIGH DENSITY POLYETHYLENE (HDPE) PRESSURE PIPE AND FITTINGS ........................... 18 UPVC PIPE AND FITTINGS .................................................................................................................. 29 CONCRETE ENCASEMENT ................................................................................................................. 36 WADI CROSSINGS .................................................................................................................................. 37 PIPE SUPPORTS ..................................................................................................................................... 37 BUILT-IN PIPES TO STRUCTURES ................................................................................................. 38 FIBRE OPTIC CABLE PROTECTION DUCT................................................................................... 39 CLEANLINESS OF PIPELINES ......................................................................................................... 39 PRESSURE PIPELINE MARKER POSTS ....................................................................................... 40 VALVE CHAMBER MARKER POSTS .............................................................................................. 40 ABANDONMENT OF PIPELINES ..................................................................................................... 40 MANHOLES........................................................................................................................................... 41 PRECAST CONCRETE MANHOLES AND SOAKAWAYS ........................................................... 48 PRECAST CONCRETE SEGMENTS FOR TUNNELS AND SHAFTS ....................................... 48 PRESTRESSED CONCRETE PIPES AND FITTINGS .................................................................. 49 HDPE PRE FABRICATED MANHOLES AND CHAMBERS ......................................................... 49 PROPERTY CONNECTIONS SURVEY .......................................................................................... 56 TESTING OF PIPELINES ................................................................................................................... 57 PRESSURE PIPELINES TESTING ................................................................................................... 59 CLEANING OF SEWER PIPELINES................................................................................................ 60 CCTV SURVEY..................................................................................................................................... 61 SEWER REHABILITATION................................................................................................................. 62 HANDRAILS, FLOORING PLATFORMS AND STAIRCASES ...................................................... 65 GRP PRODUCTS ................................................................................................................................. 73

STANDARD SPECIFICATION

Page 1 of 77

Document Number AM-ENG-SS-02-04

Date of issue 31/12/2010

Rev 02

Section 04 Sewerage 1. 1.1 General Scope

This Section Includes Specifications for the Construction and Installation of Sewerage System Pipelines. 1.2 Reference Standards and Documents

BS EN 752-4:2008, Drain and sewer systems outside buildings BS EN 14161:2003, Pipeline transportation systems BS 410-2:2000, Test sieves. Technical requirements and testing. BS EN 12620:2002, Aggregates from natural sources for concrete BS 1924, Stabilized materials for civil engineering purposes BS 6031, Code of practice for earthworks BS EN ISO 12958:1999, Methods of tests for geotextile BS EN 1452:2000, Joints and fittings for use with unplasticised PVC pressure pipe BS EN 13598-1 :2003, Unplasticised polyvinyl chloride (PVC-U) pipes and plastics fittings BS EN 13598-2:2009 : Plastics piping systems for non-pressure underground drainage and sewerage. Unplasticized polyvinyl chloride (PVC-U), polypropylene (PP) and polyethylene (PE). Specifications for manholes and inspection chambers in traffic areas and deep underground installations BS EN 1796:2006, BS EN 14364;2006 Glass reinforced plastic (GRP) pipes and fittings for use for water supply or sewerage BS EN 1401-1:1998, Unplasticised PVC pipe and fittings for gravity sewers BS 6076: 1996 Specification for polymeric film for use as a protective sleeving for buried iron pipes and fittings (for site and factory application) BS EN 1993-1-5:2006, The use of structural steel in building BS 4592:2006, Industrial type metal flooring, walkways and stair treads. BS 5395-1:2000, Stairs, ladders and walkways

STANDARD SPECIFICATION

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Document Number AM-ENG-SS-02-04

Date of issue 31/12/2010

Rev 02

BS EN 12944-1to8, BS EN 14713 Code of practice for protective coating of iron and steel structures against Corrosion. BS 3532, Method for specifying unsaturated polyester resin systems BS 3749, E glass fibre woven roving fabrics for the reinforcement of polyester and epoxy resin systems. BS EN 1917:2002 Concrete manholes and inspection chambers, unreinforced, steel fibre and reinforced BS 5911-4:2002 Concrete pipes and ancillary concrete products. Specification for unreinforced and reinforced concrete inspection chambers BS EN 206-1:2000 Concrete. Specification, performance, production and conformity BS EN 206-1:2000 Concrete. Specification, performance, production and conformity BS EN 1916:2002 Concrete pipes and fittings, unreinforced, steel fibre and reinforced

1.3

Material Inspection

Contractor / manufacturer shall submit Inspection Testing plan for prior approval of Engineer before start of construction activity or production at factory. Engineer shall involve at various stages to witness the manufacturing and construction activities to ensure Quality Control at each and every stage. Contractor shall appoint an experienced and reputed third party for quality control at production factory or at site, if required by the Engineer. Engineer shall also select samples at random of site delivered material and send to independent lab for testing to ensure the compliance. Pipes and fittings including inside linings and outside coatings, shall be inspected by the Contractor and Engineer immediately before and after installation, and damage or other imperfection shall be repaired by the Contractor as directed by the Engineer before installation. Material required for the repair of pipe, linings and coatings shall be obtained by the Contractor and shall be used in accordance with the Manufacturers recommendations. Without relieving the Contractor of any of his obligations, the Engineer may inspect and test the pipe and fittings by any appropriate means. The

STANDARD SPECIFICATION

Page 3 of 77

Document Number AM-ENG-SS-02-04

Date of issue 31/12/2010

Rev 02

Contractor shall remove from Site any pipe or fittings which in the opinion of the Engineer is not complying with the required standard. The Contractor may replace damaged pipes and fittings to the approval of the Engineer. The Contractor shall submit to the Engineer notice of work requiring inspection through the approved form not less than 24 hours before requiring inspection of those works or otherwise in accordance with the project Quality Plan. The Employer may employ the services of a specialist firm to assist the Engineer as he may require in any matter connected with pipes, and fitting including the inspection of materials and workmanship and the witnessing of tests at any stage during the execution and maintenance of the Works. Such independent tests may be carried out at any stage during the execution and maintenance of the Works, but they shall not relieve the Contractor of his obligations under the Contract. To the extent ordered by the Engineer, the Contractor shall provide labor, plant, tools and materials (but not special testing equipment) for direct assistance to the specialist firm in their inspection and independent testing and for any further work, investigations, an