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BS EN 805:2025 Water supply. Requirements for systems and components outside buildings, 2025
- undefined
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 General
- 3.2 System
- Figure 1 — Example of different types of pumping stations
- Figure 2 — Example of a water distribution system [Go to Page]
- 3.3 Components
- 3.4 Diameters
- 3.5 Installation
- Figure 3 — Illustration of terms used in pipe installation [Go to Page]
- 3.6 Hydraulic design
- 3.7 Structural design
- 4 Requirements for water supply systems [Go to Page]
- 4.1 Water quality and regulatory framework [Go to Page]
- 4.1.1 General
- 4.1.2 Materials
- 4.1.3 Prevention of back flow
- 4.1.4 Stagnation
- 4.1.5 Cross-connections with other systems
- 4.1.6 Contaminated soil
- 4.2 Planning horizon for water supply systems
- 4.3 Demand for water [Go to Page]
- 4.3.1 Water demand estimates
- 4.3.2 Water for firefighting
- 4.4 System hazards and security
- 5 Service levels
- 6 Rehabilitation
- 7 Design [Go to Page]
- 7.1 Design objectives
- 7.2 Peak flow factors
- 7.3 Hydraulic design [Go to Page]
- 7.3.1 Sizing
- 7.3.2 Hydraulic calculations
- 7.3.3 Hydraulic roughness value
- 7.3.4 Flow velocities
- 7.3.5 Network analysis
- 7.3.6 Local mains
- 7.3.7 Service pipes [Go to Page]
- 7.3.7.1 Domestic consumers
- 7.3.7.2 Non-domestic consumers
- 7.3.7.3 Firefighting
- 7.4 Structural design [Go to Page]
- 7.4.1 General
- 7.4.2 Internal forces
- 7.4.3 External forces
- 7.4.4 Temperature range
- 7.4.5 Unbalanced thrust
- 7.4.6 Design requirements
- 7.4.7 Hydrostatic design requirements
- Table 1 — Pressure conditions for specifying components
- Table 2 — Designation of pressures in English, French and German [Go to Page]
- 7.4.8 Unforeseen ground conditions
- 7.5 System layout [Go to Page]
- 7.5.1 Mains
- 7.5.2 Types of system configurations
- 7.5.3 Service pipes
- 7.5.4 Valves [Go to Page]
- 7.5.4.1 Entry and release of air
- 7.5.4.2 Draining
- 7.5.4.3 Isolating
- 7.5.4.4 Hydrants
- 7.5.5 Surge limiting equipment
- 7.6 Protection against aggressive environment
- 7.7 Reservoirs
- 7.8 Pumping stations
- 7.9 Design service life
- 7.10 Documentation
- 8 General requirements for products [Go to Page]
- 8.1 General
- 8.2 Materials
- 8.3 Dimensions [Go to Page]
- 8.3.1 Nominal sizes
- 8.3.2 Internal diameters
- Table 3 — Minus tolerances on the internal diameter [Go to Page]
- 8.3.3 Length and wall thickness
- 8.3.4 Geometry of pipes, fittings, and valves
- 8.3.5 Internal surface
- 8.3.6 Appearance and soundness
- 8.4 Structural design
- 8.5 Mechanical requirements [Go to Page]
- 8.5.1 Circumferential resistance
- 8.5.2 Longitudinal resistance
- 8.6 Water tightness
- 8.7 Joints [Go to Page]
- 8.7.1 General
- 8.7.2 Rigid joints
- 8.7.3 Adjustable joints
- 8.7.4 Flexible joints
- 8.8 Protective measures
- 8.9 Durability
- 8.10 Test methods [Go to Page]
- 8.10.1 General
- 8.10.2 Measurement of diameter and wall thickness [Go to Page]
- 8.10.2.1 Internal diameter
- 8.10.2.2 External diameter
- 8.10.2.3 Wall thickness
- 8.10.3 Measurement of deviation from straightness of barrel
- 8.10.4 Measurement of deviation from squareness of component ends
- 8.10.5 Longitudinal resistance test for pipes
- 8.10.6 Crushing test for pipes with rigid behaviour
- Table 4 — Maximum width of bearing strip [Go to Page]
- 8.10.7 Ring stiffness test for pipes with flexible behaviour
- 8.10.8 Pressure tests [Go to Page]
- 8.10.8.1 General
- 8.10.8.2 Tests for pipes
- 8.10.8.3 Tests for joints
- 8.10.8.4 Tests for fittings, accessories, valves, and other components
- 8.11 Interconnection of products
- 8.12 Quality management
- 8.13 Marking
- 9 Installation [Go to Page]
- 9.1 General requirements [Go to Page]
- 9.1.1 Qualifications
- 9.1.2 Rules for the execution of construction work
- 9.1.3 Transport and storage of pipeline components
- 9.1.4 Health and safety [Go to Page]
- 9.1.4.1 General requirements
- 9.1.4.2 Installation requirements
- 9.2 Pipe trenches [Go to Page]
- 9.2.1 Construction of pipe trenches; working space
- 9.2.2 Depth of cover
- 9.2.3 Bedding
- 9.3 Installation of pipeline components [Go to Page]
- 9.3.1 Distances from underground installations
- 9.3.2 Protection of pipelines against contamination
- 9.3.3 Installation of valves, fittings and other components
- 9.3.4 Connection to structures
- 9.3.5 Precautions against flotation
- 9.4 Pipe joints [Go to Page]
- 9.4.1 General requirements
- 9.4.2 Unrestrained joints
- 9.4.3 Restrained joints
- 9.4.4 Welded joints
- 9.4.5 Lubricants for joints
- 9.5 Protection against corrosion and contamination [Go to Page]
- 9.5.1 External protection [Go to Page]
- 9.5.1.1 General requirements
- 9.5.1.2 Inspection and testing of anticorrosive external coatings
- 9.5.2 Internal protection
- 9.6 Embedment and main backfill [Go to Page]
- 9.6.1 General
- 9.6.2 Selected material for the embedment
- 9.6.3 Execution of the embedment
- 9.6.4 Execution of the main backfill
- 9.6.5 Control of the degree of compaction
- 9.6.6 Diametral deflection of flexible pipes after installation
- 9.7 Records of tests during installation
- 10 Testing of pipelines [Go to Page]
- 10.1 General
- 10.2 Safety [Go to Page]
- 10.2.1 Safety equipment and clothing
- 10.2.2 Excavations
- 10.2.3 Filling and testing
- 10.3 Pressure test [Go to Page]
- 10.3.1 Preparations [Go to Page]
- 10.3.1.1 Backfilling and anchorage
- 10.3.1.2 Selection and filling of the test section
- Figure 4 — Maximum difference in elevation between MDP and STP [Go to Page]
- 10.3.2 Test pressure
- 10.3.3 Installation point for testing equipment
- 10.3.4 Testing at operating pressure with visual inspection
- 10.4 Testing procedure [Go to Page]
- 10.4.1 General requirements
- 10.4.2 Preliminary test
- 10.4.3 Pressure drop test
- 10.4.4 Main pressure test [Go to Page]
- 10.4.4.1 General requirements
- 10.4.4.2 Pressure loss method
- 10.4.4.3 Water loss method
- 10.4.5 Depressurization
- 10.4.6 Test evaluation
- 10.4.7 Final system test
- 10.4.8 Recording test results
- 11 Preparation for commissioning [Go to Page]
- 11.1 General
- 11.2 Preparation for disinfection [Go to Page]
- 11.2.1 General requirements
- 11.2.2 Disinfection equipment
- 11.3 Selection of disinfectant
- 11.4 Disinfection procedures [Go to Page]
- 11.4.1 General requirements
- 11.4.2 Static procedure
- 11.4.3 Dynamic procedure
- 11.4.4 Disposal of disinfectant
- 11.5 Microbiological clearance and reporting
- 12 Additional requirements
- 13 Operation [Go to Page]
- 13.1 Inspection and monitoring
- 13.2 Maintenance
- 14 Updating of the documentation
- Annex A (informative) Guidance to EN 805
- A.1 General
- A.2 Pressures
- Figure A.1 — Example of pressurized gravity main
- Figure A.2 — Example of surge wave
- A.3 Prevention of back siphonage
- A.4 Water demand estimates
- A.5 Water for firefighting
- A.6 Service objectives
- A.7 Peak flow factors
- A.8 Sizing
- A.9 Hydraulic roughness value
- Figure A.3 — Example of relation between roughness value and pressure loss for various internal diameters (D) - (length = 100 m; flow velocity = 1,5 m/s; water temperature = 10 C)
- A.10 Flow velocities
- A.11 Network analysis
- A.12 Local mains
- Table A.1 — Typical minimum pipe sizes for supplying small residential developments
- A.13 Mains
- A.14 Types of system configuration
- Figure A.4 — Examples of system configuration
- A.15 Service pipes
- A.16 Entry and release of air
- Figure A.5 — Examples of high points
- A.17 Draining
- A.18 Isolation
- A.19 Hydrants
- A.20 Protection against aggressive environment
- A.21 Pumping stations
- A.22 Structural design
- Table A.2 — Examples of information on characteristics/requirements/test methods to be included in product standards
- A.23 Testing of non-viscoelastic pipelines (metals, concrete, GRP)
- A.23.1 General
- Figure A.6 — Flowchart of the pressure testing procedure
- A.23.2 Safety
- A.23.3 Preparation of a test section
- A.23.3.1 General
- A.23.3.2 Anchoring and closures
- Table A.3 — Examples of thrust forces generated by a pressure of 1 bar on socketed pipeline closure
- Figure A.7 — Example of anchoring with jacks
- A.23.3.3 Partial backfilling
- Figure A.8 — Partial backfilling before testing
- A.23.3.4 Filling with water and air venting
- Figure A.9 — Typical filling flow rates
- A.23.4 Pressure testing procedure
- A.23.4.1 General
- Figure A.10 — Filling and applicable pressure
- Figure A.11 — Components for pressure testing
- Figure A.12 — Steps in the testing procedure, including preparation, with alternative check instead of the pressure drop test (see also Figure A.6)
- A.23.4.2 Preliminary test
- A.23.4.3 Pressure drop test
- A.23.4.4 Main pressure test
- A.23.4.4.1 General
- A.23.4.4.2 Pressure loss test
- A.23.4.4.3 Water loss test
- A.23.5 Finalization of testing
- A.24 Testing of viscoelastic pipelines (PE, PVC-U, PVC-O)
- A.24.1 General
- A.24.2 Safety
- A.24.3 Preparation of a test section
- A.24.3.1 General
- A.24.3.2 Anchoring and closures
- A.24.3.3 Partial backfilling
- A.24.3.4 Filling with water and air venting
- A.24.3.5 Temperature and pressure-derating
- Table A.4 — Pressure de-rating factor for temperatures above 20 C
- A.24.4 Pressure testing procedures
- A.24.4.1 General
- A.24.4.2 Selection of test method
- Figure A.13 — Selection of test method
- A.24.4.3 Test pressure for viscoelastic pipes
- Table A.5 — Values of STP based on MDP
- A.24.5 Testing procedure using the contraction method
- A.24.5.1 General
- Figure A.14 — Sketch of pressure test using the contraction method
- A.24.5.2 Preliminary test
- A.24.5.3 Pressure drop test
- Table A.6 — Pressure drop Δp
- Table A.7 —Calculated water volume Vc (ml/m) in accordance with Formula (A.3)
- A.24.5.4 Main pressure test
- A.24.6 Testing procedure using the normal method
- A.24.6.1 General
- Figure A.15 — Sketch of pressure test using the normal method
- A.24.6.2 Preliminary test
- A.24.6.3 Pressure drop test
- A.24.6.4 Main pressure test
- Table A.8 — Example testing values for normal procedure
- A.24.7 Finalization of testing
- A.25 Selection of disinfectants
- Table A.9 — Details of chemicals typically used for disinfection of water distribution systems
- Bibliography [Go to Page]
