GENERAL SPECIFICATION FOR DRAINAGE INSTALLATION IN ...

1 GENERAL SPECIFICATION FOR DRAINAGE INSTALLATION IN GOVERNMENT BUILDINGS OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION 2017 EDITION ARCHITECTURAL services DEPARTMENT THE GOVERNMENT OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION PREFACE This GENERAL SPECIFICATION aims to lay down the technical requirements of materials and equipment, the standards of workmanship, the requirements on testing and commissioning, and operation and maintenance as well as requirements on document submissions for DRAINAGE INSTALLATION in Government Buildings of the Hong Kong Special Administrative Region (HKSAR). The 2017 edition of this GENERAL SPECIFICATION was developed from the 2012 edition (incorporating Corrigendum No.)

2 GSPD02- 2012) of the GENERAL SPECIFICATION for Plumbing and DRAINAGE INSTALLATION in Government Buildings by the Plumbing and DRAINAGE Specialist Support Group that was established under the Building services Branch Technical Information and Research & Development Committee of the Architectural services Department (ArchSD). It incorporates updated international standards and codes as well as technological developments which find applications in Hong Kong. To be in line with the Department s endeavour to reduce the environmental burden on our neighbours and to help preserving common resources while improving the quality of our service, this GENERAL SPECIFICATION puts emphasis on green features and green practice for construction as well as initiatives for enhancement of client satisfaction on completed projects.

3 With the benefit of information technology, electronic version of this edition is to be viewed on and free for download from the ArchSD Internet homepage. As part of the Government s efforts to limit paper consumption, hard copies of this GENERAL SPECIFICATION will not be put up for sale. The draft of the 2017 edition has been circulated to stakeholders within and external to the Government before finalisation. Nevertheless, the ArchSD welcomes comments on its contents at any time since the updating of this GENERAL SPECIFICATION is a continuous process for the inclusion of any developments that can help meeting the needs of our community. DISCLAIMER This GENERAL SPECIFICATION is solely compiled for DRAINAGE INSTALLATION carried out for or on behalf of the ArchSD in Government buildings of the HKSAR.

4 There are no representations, either expressed or implied, as to the suitability of this GENERAL SPECIFICATION for purposes other than that stated above. Users who choose to adopt this GENERAL SPECIFICATION for their works are responsible for making their own assessments and judgment of all information contained here. The ArchSD does not accept any liability and responsibility for any special, indirect or consequential loss or damages whatsoever arising out of or in connection with the use of this GENERAL SPECIFICATION or reliance placed on it. The materials contained in this document may not be pertinent or fully cover the extent of the installations in non-government buildings and there is no intimated or implied endorsement of the sales, supply and INSTALLATION of the materials and equipment specified in this GENERAL SPECIFICATION within the territory of the HKSAR.

5 Table of Contents DI_GS Page 1 of 9 2017 Edition TABLE OF CONTENTS PART A SCOPE AND GENERAL REQUIREMENTS SECTION A1 SCOPE OF SPECIFICATION Installations t o Comply with this GENERAL SPECIFICATION Scope of the Installations Terms and Definitions Singular and Plural SECTION A2 STATUTORY OBLIGATIONS AND OTHER REGULATIONS Statutory Obligations and Other Requirements Case of Conflict SECTION A3 EXECUTION OF INSTALLATIONS The International System of Units (SI) Programme of Installations Builder s Work Coordination of Installations Cooperation with Other Contractors Site Supervision Sample Board Advice of Order Placed Record of Materials Delivery Protection of Materials and Equipment Service Condition Voltage Covered by this GENERAL SPECIFICATION Label Warning Notice Guard and Railing for Moving or Rotating Parts of Equipment Equipment Deviations Waterproofing Surveys and Measurements Table of Contents DI_GS Page 2 of 9 2017 Edition SECTION A4 DRAWINGS AND MANUALS Drawings in Electronic Format INSTALLATION Drawings As-built Drawings Operation and Maintenance (O&M)

6 Manual and User Manual Table of Contents DI_GS Page 3 of 9 2017 Edition PART B INSTALLATION METHODOLOGY SECTION B1 ABOVE GROUND DRAINAGE SYSTEMS GENERAL Handling and Storage Fixing Pipes and Fittings GENERAL Details Protection to Movement and Expansion Pipework Arrangement Fixing Plastic Gutters Fixing UPVC Two-way Floor Drain Outlet Jointing Pipes and Fittings GENERAL Jointing of Cast Iron Spigot and Socket Pipes Jointing of Cast Iron Spun Spigot Pipes Jointing of Steel Pipes Jointing Steel Pipes to Cast Iron Pipes Jointing Pipes to Clay Pipe Sockets Jointing of UPVC Pipes Joints Between Dissimilar Metals Pipework Support GENERAL Pipe Bracket Intervals Pipework Penetrating Building Structure Pipes Through Walls and Floors Pipes Through Fire Barriers Pipes Through Basement Wall Pipes Through Basement Wall with Ground Water Pressure Pipes Through Flat Roofs SECTION B2 UNDERGROUND DRAINAGE SYSTEMS GENERAL Handling and Storage GENERAL Storing and Handling Pipes Storage of UPVC Pipes, Joints and Fittings Storage of Bolts and Nuts Table of Contents DI_GS Page 4 of 9 2017 Edition Storage of Elastomeric Joint Rings Storage of A nti-corrosion Tape and Joint Filler Storage of Granular Bedding Materials Storage of Manholes, Chambers and Gullies Storage of Covers.

7 Gratings and Kerb Overflow Weirs Setting Out Excavation of Trench GENERAL Trench Width Bedding and Laying of Pipes GENERAL Granular Bedding Natural Bedding Concrete Bedding, Haunch and Backfilling Subsoil Drain Bedding Backfilling of Trench GENERAL Backfilling Cutting Pipes GENERAL Elastomeric Joints Closing Lengths Precast Concrete Pipes Jointing Pipes and Fittings GENERAL Jointing of Cast Iron Pipes and Fittings Jointing of Grey Iron Pipes and Fittings Jointing of Plastic Pipes and Fittings Jointing of Vitrified Clay Pipes and Fittings Thrust and Anchor Blocks GENERAL Excavation Applying Pressure Connection of Pipes Connection to Structures Saddle Connections to Concrete and Clay Pipes Splay Cut Connections to Concrete and Clay Pipes Saddle Connections to UPVC Pipes Table of Contents DI_GS Page 5 of 9 2017 Edition Branch Pipelines

8 Recording Positions of Junctions Connecting Pipes not Required for Immediate Use Manholes, Chambers, Gullies and Channels Manholes, Chambers and Gullies Filling Around Manholes and Chambers Channels Valves GENERAL Box-outs and Rebates Cleaning and Checking Air Valves Pipes and Manholes to be Abandoned Installations Less Than 1m Deep Installations Over 1 m Deep Works Outside Site Boundary Protection Hop Dip Galvanising Anti-corrosion Tape Cleaning of System GENERAL Time of Cleaning SECTION B3 WASTE WATER HANDLING EQUIPMENT GENERAL Storage Pumps Plant Room Location Venting Valves for Pump-set Instrumentation SECTION B4 PAINTINGS, FINISHING AND IDENTIFICATION GENERAL Number of Paint Coats Required Identification of Pipelines Table of Contents DI_GS Page 6 of 9 2017 Edition PART C MATERIAL AND EQUIPMENT SPECIFICATION SECTION C1 ABOVE GROUND DRAINAGE SYSTEMS Pipes and Fittings for Surface Water DRAINAGE Cast Iron Rainwater Pipes, Gutters and Fittings UPVC Rainwater Pipes, Gutters and Fittings Rainwater Outlets Surface Channels Pipes and Fittings for Foul Water DRAINAGE Cast Iron Soil.

9 Waste and Ventilating Pipes and Fittings Galvanised Iron Pipes and Fittings UPVC Pipes and Fittings Balloon Grating and Vent Cowl Cast Iron Floor Drain Outlet UPVC Two-way Floor Drain Outlet Cast Iron Socketless Pipes and Fittings for Surface Water and Foul Water DRAINAGE SECTION C2 UNDERGROUND DRAINAGE SYSTEMS Pipes and Fittings Precast Concrete Pipes and Fittings Vitrified Clay Pipes and Fittings Cast Iron Pipes and Fittings Ductile Iron Pipes and Fittings UPVC Pipes and Fittings Sub-soil Drain Pipes and Fittings Valves GENERAL Gate Valves Flap Valves Sludge Valves Air Valves Manholes, Chambers and Gullies GENERAL Precast Concrete Manholes Precast Concrete Chambers and Gullies Vitrified Clay Gullies Table of Contents DI_GS Page 7 of 9 2017 Edition Step Irons Cast Iron Manhole Covers, Gully Gratings and Overflow Weirs Ductile Iron Manhole Covers and Frames SECTION C3 WASTE WATER HANDLING EQUIPMENT Waste Water Pumps Sump Pumps Sewage Pumps Pump Control Panel Vibration Isolators Gauges Drain and Vent Flanged Connections Table of Contents DI_GS Page 8 of 9 2017 Edition PART D INSPECTION, TESTING AND COMMISSIONING DURING CONSTRUCTION PERIOD SECTION D1 GENERAL REQUIREMENTS GENERAL Methods and Procedures Notices of Inspection.

10 Testing and Commissioning Works Labour and Materials Inspection, Measuring and Testing Equipment Readiness for Inspection, Testing and Commissioning Type-test Certificate Off-site Tests / Factory Tests Site Tests SECTION D2 INSPECTION Inspection of Materials and Equipment Delivered to Site Visual Inspection and Checking Handover Inspection Inspections Required by Authority / Mandatory Inspections SECTION D3 TESTING AND COMMISSIONING GENERAL Procedures, Standards and Requirements Master Programme for Testing and Commissioning Works Documentation and Deliverables Table of Contents DI_GS Page 9 of 9 2017 Edition PART E TRAINING, INSPECTION, ATTENDANCE, OPERATION AND MAINTENANCE DURING MAINTENANCE PERIOD SECTION E1 GENERAL REQUIREMENTS GENERAL Completion of Outstanding and Defective Works Repair and Maintenance Records SECTION E2 TRAINING TO USERS AND OPERATION AND MAINTENANCE AGENTS GENERAL SECTION E3 INSPECTION, ATTENDANCE.